Compare Image Name Manufacturer Pricing(USD) Quantity Weight(Kg) Size(LxWxH) Part Status Type Series Mount Mounting Type Operating Temperature Packaging Size / Dimension Moisture Sensitivity Level (MSL) Termination Max Operating Temperature Min Operating Temperature Height Seated (Max) RoHS Status Published Datasheet Current Rating Diameter Package / Case Height Lead Free Depth Number of Terminations Weight REACH SVHC Resistance Number of Pins Lead Pitch Pbfree Code ECCN Code Radiation Hardening Current Lead Length Reach Compliance Code HTS Code Packing Method Number of Functions Terminal Shape Tolerance JESD-609 Code Terminal Finish Case Code (Metric) Case Code (Imperial) Surface Mount Lead Diameter Operating Temperature (Max) Operating Temperature (Min) Construction Test Frequency Inductance Military Standard Q Factor Inductance Tolerance DC Resistance (DCR) Shape/Size Description Shielding Inductor Application Terminal Placement Case/Size Code Special Feature Quality Factor-Min (at L-nom) Max DC Current DC Current Rated Current-Max Current Rating (Amps) Q @ Freq Inductance Frequency - Test Current - Saturation Material - Core Frequency - Self Resonant
PM54-560K PM54-560K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsjwmiller-pm54560k-datasheets-3438.pdf 680mA 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 2.52MHz 56μH 420mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 680mA Ferrite 12MHz
ELJ-NAR10MF ELJ-NAR10MF Panasonic Electronic Components
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound NA Surface Mount Surface Mount Tape & Reel (TR) 0.126Lx0.098W 3.20mmx2.50mm 1 (Unlimited) SMD/SMT 85°C -20°C 0.094 2.40mm RoHS Compliant 2011 https://pdf.utmel.com/r/datasheets/panasonicelectroniccomponents-eljrf39njfb-datasheets-3527.pdf 360mA 1210 (3225 Metric) 2.2mm Lead Free 2.7mm 2 No SVHC 2 2mm no EAR99 No 165mA 8504.50.80.00 TR 1 J BEND ±20% e2 Tin/Copper (Sn/Cu) 3225 1210 Chip 100MHz 100nH Not 10 20% 300mOhm Max RECTANGULAR PACKAGE NO RF INDUCTOR DUAL ENDED 10 360mA 360mA 10 @ 100MHz Non-Magnetic 450MHz
PM54-180M PM54-180M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsjwmiller-pm54180m-datasheets-3440.pdf 1.23A 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% Bobbin Core 2.52MHz 18μH 150mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1.25A Ferrite 23MHz
ELJ-NA82NMF ELJ-NA82NMF Panasonic Electronic Components
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound NA Surface Mount Tape & Reel (TR) 0.126Lx0.098W 3.20mmx2.50mm 1 (Unlimited) 0.094 2.40mm RoHS Compliant 2011 https://pdf.utmel.com/r/datasheets/panasonicelectroniccomponents-eljrf39njfb-datasheets-3527.pdf 1210 (3225 Metric) 2 no EAR99 unknown 8504.50.80.00 TR 1 J BEND ±20% e2 Tin/Copper (Sn/Cu) YES 85°C -20°C Chip 100MHz 82nH 270mOhm Max RECTANGULAR PACKAGE NO RF INDUCTOR DUAL ENDED Q MEASURED AT 100 MHZ 10 0.38A 380mA 10 @ 100MHz 100MHz Non-Magnetic 500MHz
5900-182 5900-182 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 600mA Axial Contains Lead 2 2 no EAR99 8504.50.80.00 1 ±10% 0.8 mm Shrink Tube 1kHz 1.8mH 1.5Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 0.6A 530mA 620mA Ferrite
PM54-181K PM54-181K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bourns-pm54181k-datasheets-3445.pdf 380mA 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 1kHz 180μH 1.38Ohm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 380mA Ferrite 6MHz
PM54-151K PM54-151K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bourns-pm54151k-datasheets-3447.pdf 400mA 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 1kHz 150μH 1.1Ohm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 480mA Ferrite 8MHz
PM54-121K PM54-121K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bourns-pm54121k-datasheets-3450.pdf 480mA 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 1kHz 120μH 22 930mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 480mA Ferrite 8MHz
PM54-100M PM54-100M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54120m-datasheets-1324.pdf 1.44A 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% Bobbin Core 2.52MHz 10μH 100mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1.45A Ferrite 30MHz
PM54-270M PM54-270M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54120m-datasheets-1324.pdf 970mA 5.8mm Nonstandard 4.8mm Contains Lead 5.55mm 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% Bobbin Core 2.52MHz 27μH Not 200mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1A 970mA Ferrite 17MHz
5800-5R6 5800-5R6 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5800 Through Hole Through Hole -55°C~105°C Bulk 0.275Diax0.700L 6.99mmx17.78mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-58006r8-datasheets-1032.pdf 2.5A 6.985mm Axial Contains Lead 2 no EAR99 8504.50.80.00 1 ±10% 1kHz 5.6μH 23mOhm Max TUBULAR PACKAGE NO HIGH CURRENT INDUCTOR 5.6A 5A Ferrite
PM54-680K PM54-680K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54120m-datasheets-1324.pdf 610mA 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 2.52MHz 68μH 460mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 610mA Ferrite 11MHz
PM54-820K PM54-820K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54120m-datasheets-1324.pdf 580mA Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 2.52MHz 82μH 600mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 580mA Ferrite 10MHz
5900-683 5900-683 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 82mA 11.5062mm Axial Contains Lead 2 no EAR99 25.4mm 8504.50.80.00 1 ±10% Shrink Tube 1kHz 68mH 58Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 101mA 80mA 100mA Ferrite
PM54-101K PM54-101K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54150mrc-datasheets-0753.pdf Nonstandard 2 EAR99 8504.50.80.00 TR 1 ONE SURFACE ±10% YES Bobbin Core 0.001MHz 100μH 700mOhm RECTANGULAR PACKAGE Unshielded POWER INDUCTOR DUAL ENDED 2320 0.52A 520mA 1kHz Ferrite 9MHz
PM43-220M PM43-220M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM43 Surface Mount Surface Mount -40°C~100°C Tape & Reel (TR) 0.177Lx0.157W 4.50mmx4.00mm 1 (Unlimited) SMD/SMT 0.138 3.50mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsjwmiller-pm43220m-datasheets-3391.pdf 680mA 4.5mm Nonstandard 3.2mm Contains Lead 2 26.988746mg EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% 4532 1812 Bobbin Core 2.52MHz 22μH 378mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1816 760mA Ferrite 24MHz
PM43-470K PM43-470K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM43 Surface Mount Surface Mount -40°C~100°C Tape & Reel (TR) 0.177Lx0.157W 4.50mmx4.00mm 1 (Unlimited) SMD/SMT 0.138 3.50mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm43150m-datasheets-1286.pdf 440mA 4.5mm Nonstandard 3.2mm Contains Lead 2 26.988746mg 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% 4532 1812 Bobbin Core 2.52MHz 47μH 844mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1816 440mA Ferrite 15MHz
PM43-330K PM43-330K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM43 Surface Mount Surface Mount -40°C~100°C Tape & Reel (TR) 0.177Lx0.157W 4.50mmx4.00mm 1 (Unlimited) SMD/SMT 0.138 3.50mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bourns-pm43330k-datasheets-3396.pdf 560mA 4.5mm Nonstandard 3.2mm Contains Lead 4.3mm 2 26.988746mg 540mOhm EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% 4532 1812 Bobbin Core 2.52MHz 33μH Not 540mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1816 560mA 560mA Ferrite 19MHz
5900-123 5900-123 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 200mA 11.5062mm Axial Contains Lead 2 no EAR99 25.4mm 8504.50.80.00 1 ±10% Shrink Tube 1kHz 12mH 8.5Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 241mA 220mA 240mA Ferrite
5900-393 5900-393 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 100mA 11.5062mm Axial Contains Lead 2 31.8Ohm 2 no EAR99 8504.50.80.00 1 ±10% Shrink Tube 1kHz 39mH 31Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 135mA 120mA 130mA Ferrite
5900-562 5900-562 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 315mA 11.5062mm Axial Contains Lead 2 no EAR99 25.4mm 8504.50.80.00 1 ±10% Shrink Tube 1kHz 5.6mH 4.1Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 359mA 320mA 350mA Ferrite
PM43-560K PM43-560K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM43 Surface Mount Surface Mount -40°C~100°C Tape & Reel (TR) 0.177Lx0.157W 4.50mmx4.00mm 1 (Unlimited) SMD/SMT 0.138 3.50mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bourns-pm43560k-datasheets-3406.pdf 420mA 4.5mm Nonstandard 3.2mm Contains Lead 2 26.988746mg EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% Bobbin Core 2.52MHz 56μH 937mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1816 420mA Ferrite 14MHz
5900-472 5900-472 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 400mA 11.5062mm Axial Contains Lead 2 no EAR99 25.4mm 8504.50.80.00 1 ±10% Shrink Tube 1kHz 4.7mH 3.7Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 4mA 340mA 380mA Ferrite
5900-823 5900-823 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 65mA 11.5062mm Axial Contains Lead 2 no EAR99 25.4mm 8504.50.80.00 1 ±10% Shrink Tube 1kHz 82mH 65Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 90mA 79mA 92mA Ferrite
PM43-680K PM43-680K Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM43 Surface Mount Surface Mount -40°C~100°C Tape & Reel (TR) 0.177Lx0.157W 4.50mmx4.00mm 1 (Unlimited) SMD/SMT 0.138 3.50mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm43150m-datasheets-1286.pdf 370mA 4.5mm Nonstandard 3.2mm Contains Lead 2 26.988746mg EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±10% 4532 1812 Bobbin Core 2.52MHz 68μH 1.117Ohm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1816 370mA Ferrite 13MHz
5900-222 5900-222 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 500mA 11.5062mm Axial Contains Lead 2 2 no EAR99 8504.50.80.00 1 ±10% Shrink Tube 1kHz 2.2mH Not 1.7Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 580mA 500mA 560mA Ferrite
5900-563 5900-563 Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound 5900 Through Hole Through Hole -55°C~105°C Bulk 0.453Diax0.900L 11.51mmx22.86mm 1 (Unlimited) Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-5900270-datasheets-1180.pdf 100mA 11.5062mm Axial Contains Lead 2 2 no EAR99 8504.50.80.00 1 ±10% Shrink Tube 1kHz 56mH 45Ohm Max TUBULAR PACKAGE NO RF INDUCTOR 112mA 110mA Ferrite
PM54-120M PM54-120M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54120m-datasheets-1324.pdf 1.4A 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% Bobbin Core 2.52MHz 12μH 120mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1.4A Ferrite 27MHz
PM54-150M PM54-150M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM54 Surface Mount Surface Mount -30°C~100°C Tape & Reel (TR) 0.228Lx0.228W 5.80mmx5.80mm 1 (Unlimited) SMD/SMT 0.189 4.80mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm54120m-datasheets-1324.pdf 1.3A 5.8mm Nonstandard 4.8mm Contains Lead 2 2 EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% Bobbin Core 2.52MHz 15μH 140mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1.3A Ferrite 25MHz
PM43-120M PM43-120M Bourns Inc.
RFQ

Min: 1

Mult: 1

0 0x0x0 download Wirewound PM43 Surface Mount Surface Mount -40°C~100°C Tape & Reel (TR) 0.177Lx0.157W 4.50mmx4.00mm 1 (Unlimited) SMD/SMT 0.138 3.50mm Non-RoHS Compliant 2006 https://pdf.utmel.com/r/datasheets/bournsinc-pm43150m-datasheets-1286.pdf 970mA 4.5mm Nonstandard 3.2mm Contains Lead 2 26.988746mg EAR99 unknown 8504.50.80.00 TR 1 ONE SURFACE ±20% Bobbin Core 2.52MHz 12μH 210mOhm RECTANGULAR PACKAGE NO POWER INDUCTOR DUAL ENDED 1816 1.05A Ferrite 32MHz

In Stock

Please send RFQ , we will respond immediately.