Referenced Series Manufacturer Style Referenced Firstohm Series Main Common Feature(s) Main Difference(s) Remarks on Application

CHP general IRC / TT Same style MM MELF Dimensions, Resistance range Note : Dimensions, Resistance range

CHP low resistance IRC / TT Same style CSM MELF / Low Resistance Dimensions, Resistance range Note : Dimensions, Resistance range

CHP power IRC / TT Same style EFP/SFP MELF / High power Dimensions, TC, Resistance range Note Dimensions, TC, Resistance range

CHP surge IRC / TT Same style SRM/MRM MELF / Anti-surge Dimensions, TC, Surge withstanding capability, Resistance range Note : Dimensions, TC, Surge withstanding capability, Resistance range

HSF IRC / TT Same style SRM/SWM MELF / Anti-surge Dimensions,TC, Resistance range, Peak power Note : Dimensions,TC, Resistance range, Peak power

MCHP IRC / TT Same style SFP Power MELF Dimensions, Rated power, Resistance range Note : Dimensions, Rated power, Resistance range

MRC 1/2 IRC / TT Same style EFP204 Power MELF Dimensions, TC, Resistance range Note : Dimensions, TC, Resistance range

ZCHP IRC / TT Same style ZMM MELF / Zero-ohm jumper Dimensions, Current rating Note : Dimensions, Current rating

BWR KOA Same style MQM/WQM Wirewound resistor Dimensions, Resistance range Note : Dimensions, Resistance range

CF / CFP KOA Same style R Carbon film Dimensions, TC, Note : Dimensions,TC

CPCN KOA Same style ISC Ignition Noise Suppression Resistor Dimensions, TC, Resistance range Note :Dimensions, TC, Resistance range

CW KOA Same style SWA Anti-surge Wirewound Dimension, Tolerance, Resistance range Note : Dimension, Tolerance, Resistance range

HPC / PCF KOA Same style C3 Ceramic composition Dimensions, TC, Maximum surge voltage Note : Max. permissible surge voltage, AEC-Q200 quqlified (HPC)

MF / MFS /RK KOA Same style M General purpose metal film

Dimensions, Power rating,

Resistance range

Note : Dimensions, Power rating, Resistance range, AEC-Q200 qualifued, UL &

c-UL approval

MO / MOS KOA Same style MO/MO miniature size Metal oxide resistor Dimensions, Resistance range, TC Note : Dimensions, Resistance range, TC

RCR KOA Same style HDR High voltage discharge resistor Dimensions, TC Note : Dimensions, TC

RD41 KOA Same style CM MELF / Carbon film Dimensions, Power rating Note : Dimensions, Power rating

RF KOA Same style FGE Fusible Resistor Dimensions, Fusing Characteristics Note : Dimensions, Fusing Characteristics

RF25CC KOA Same style FGE26C

Fusible Resistor / low resistance /

Constant current fusing

Fusing Characteristics Note : Fusing Characteristics

RN41 KOA Same style MMP MELF / Metal film

Dimensions, Resistance range,

Power rating, Operating temperature

Note :Dimensions, Resistance range, Power rating, Operating temperature

RNS KOA Same style MP Metal film/ Precision Dimensions, Resisistance range Note : Dimensions, Resisistance range

RW KOA Same style WA Wirewound Resistor

Dimensions, Non-inductive wire wound, Tolerance, Operate

Temperature,

Resistance range, TC

Note : Dimensions, Tolerance, Resistance range, TC, Operature temperature

SNF KOA Same style M Metal Film

Dimensions, Flame Retardant,

Resistance range

Note : Dimensions, Flame Retardant, Resistance range

Z KOA Same style ZOM Zero ohm jumper Dimensions Note : Dimensions

OX Ohmite Same style C3 Ceramic composition Dimensions,TC & Resistance range Note : Dimensions, TC & Resistance range

MGR ROYALOHM Same style HVR High voltage / VDE 0860 approved Dimensions,TC Note : Dimensions,TC, Maximum working voltage

EMC2 TT Same style SWA02 Pulse withstanding Fusible Fusing Characteristics, Dimension, Pulse performance

Note : Dimensions, Pulse performance,

Resistance range & UL recognised

ULW3 TT Same style SWA03 Fusible Wirewound Fusing Characteristics, Dimension, Pulse performance Note : Dimension, Resistance range & UL recognised

AC03.. CS/AC05.. CS VISHAY Same style SWA03/SWA05 Fusible Wirewound Fusing Characteristics, Dimension, Pulse performance Note : Fusing Characteristic, Dimensions, Resistance range & UL recognised

CCF VISHAY Same style MO Metal Film/Fiameproof Dimensions, TC, Resistance range Note : Dimensions, TC, Resistance range

CMA 0204 Power VISHAY Same style SRM204T High Pulse Load MELF Maximum pulse load Note : Maximum pulse load

CMA 0204 Standard VISHAY Same style SRM204 High Pulse Load MELF Maximum pulse load Note : Maximum pulse load

CMB 0207 Power VISHAY Same style SRM101T High Pulse Load MELF Maximum surge voltage Note : Maximum surge voltage, AEC-Q200 qualified

CMB 0207 Standard VISHAY Same style SRM207P High Pulse Load MELF Maximum surge voltage Note : Maximum surge voltage, AEC-Q200 qualified

CPF VISHAY Same style M/ EFR High power Dimensions,TC, Resistance range Note : Dimensions,TC, Resistance range

FRJ VISHAY Same style ZOM Metal Film/Zero ohm jumper Dimensions Note : Dimensions

MMA 0204 Power VISHAY Same style EFP204 / SFP204 Power MELF TC, Resistance range, Maximum pulse load Note : TC, Resistance range, Maximum pulse load, AEC-Q200 qualified

MMA 0204 Standard VISHAY Same style MMP204 Precision MELF TC, Resistance range, Maximum pulse load Note : TC, Resistance range, Maximum pulse load, AEC-Q200 qualified

MMB 0207 Power VISHAY Same style EFP101/ SFP101 Power MELF TC, Resistance range, Maximum pulse load Note : TC, Resistance range, Maximum pulse load, TC, AEC-Q200 qualified

MMB 0207 Standard VISHAY Same style MMP52 Precision MELF TC, Resistance range, Maximum pulse load Note : TC, Resistance range, Maximum pulse load, AEC-Q200 qualified

NFR25H VISHAY Same style SCP50 Overload protection without fire Dimensions, TC Note : Dimensions, TC

NSR VISHAY Same style ISW Wirewound Noise Suppressor Dimensions, Resistance range, TC Note : Dimensions, Resistance range, TC

PMM0204 VISHAY Same style MMP16 / MMP204 MELF / Precision Rated power Note : power requirement

PMM0207 VISHAY Same style MMP207 / MMP52 MELF / Precision Rated power Note : power requirement

PR01/02 VISHAY Same style PWR01/PWR02 Power Metal Film

Dimensions, Peak pulse voltage,

Fusing Characteristics

Note :Dimensions, Peak pulse voltage, Fusing Characteristics, AEC-Q200

qualified

PTF VISHAY Same style MP

High precesion / High stability /

Tight tolerance

Dimensions, Rated power, TC Note : Dimensions, Rated power, TC

SMA / MK VISHAY Same style PMA Metal film / Low TC / Low tolerance

Dimensions, Resistance range,

Maximum peak voltage

Note Dimensions, Resistance range, Maximum peak voltage

SMM0204 VISHAY Same style MMP204 MELF / Low TCR / Tight Tolerance Maximum pulse voltage Note : Maximum pulse voltage, AEC-Q200 qualified

SMM0207 VISHAY Same style EFP101 / SFP101 MELF with high power rating TC, Maximum pulse voltage Note : TC, Maximum pulse voltage, AEC-Q200 qualified

UXA/UXB/UXE VISHAY Same style MP

High precision / Low TC /

Tight tolerance

Dimensions, TC, Resistance range Note : Dimensions, TC, Resistance range

VR37 VISHAY Same style HVR50

VDE 0860 approved /

High voltage

Dimensions, TC Note : Dimensions, TC

VR68 VISHAY Same style HVR100 / HVR200

VDE 0860 approved /

High voltage

Dimensions, TC Note : Dimensions & TC

ZC0204 VITROHM Same style MMP204 MELF / Metal film TC, Tolerance, Peak power Note : TC, Tolerance, Peak power

ZC0207 VITROHM Same style EFP101 MELF / Metal film TC, Tolerance , Peak power Note : TC, Tolerance, Peak power

WRM0204 Welwyn/TT Same style MMP204 MELF / Metal film Tolerance, Resistance range Note : Tolerance, Resistance range

WRM0207 Welwyn/TT Same style MMP52 MELF / Metal film Tolerance, Resistance range Note : Tolerance, Resistance range

Referenced Series Manufacturer Style Referenced Firstohm series Main Common Feature(s) Main Difference(s) Remarks

WSF VISHAY SMD/High power metal film SFP SMD / High power metal film Style/Dimensions, TC, Resistance range, Operating temperature

Note : Dimensions, TC, Resistance range, Operating temperature, AEC-Q200

qualified

WSC/WSN/WSZ VISHAY

SMD/Precision power

wirewound

SWM SMD/Power wirewound

Style/Dimensions, TC, Resistance range, Tolerance, Operating

temperature

Note : Dimensions, TC, Resistance range, Tolerance, Operating temperature,

AEC-Q200 qualified

WSR VISHAY

SMD/Power Metal Strip

Resistors

CSM

SMD / Low resistance for current

sensing

Style /Dimensions, Tolerance, TC, Extremely low resistance,

Operating temperature

Note : //Dimensions, Tolerance, TC, Extremely low resistance, Operating

temperature, AEC-Q200 qualified

CP-2M / CPSM VISHAY SMD/Wirewound Resistor SWM SMD / High power, Surge capability Style/Dimensions, TC, Resistance range, Operating temperature Note : /Dimensions, TC, Resistance range, Operating temperature

CRCW-1206HP e3 (0.5W) /

CRCW-2512HP e3 (1.5W)

VISHAY

Pulse-Proof,

High-Power Thick Film

Chip Resistors

SRM 204T / SRM101T SMD / Surge withstanding

Style/Dimensions, Tolerance, Rated power,

Maximum pulse load

Note : Dimensions, Tolerance, Rated power,

Maximum pulse load, AEC-Q200 Qualified

SWR06 (1/3W) VIKING Surge withstanding chip MRM204 / SRM204T SMD / Surge withstanding Style/Dimensions, Resistance range, Rated power, Pulse power Note : Dimensions, Resistance range, Rated power, Pulse power

SR1206 (1/4W) YAGEO Thick film surge chip MRM204 / SRM204T SMD / Surge withstanding Style//Dimensions, Resistance range, Rated power, Pulse power Note : Dimensions, Resistance range, Rated power, Pulse power

Chip 2512 (1W) General Chip EFP101 / SFP101 SMD Style/Dimensions, TC Note : Dimensions, TC

CS12 (Chip 2512，2W) VIKING Current Sensing Chip Resistor CSM202

High power rating /

Low resistance for current detection

Style/Dimensions, Resistance range, Low TC Note : Dimensions, Resistance range, TC

RLP25/RLM25 (Chip 2512，2W) TAI-I High Power Current Sensing SRC202

High power rating,

Low resistance for current detection

Style/Dimensions, Low TC, Resistance range, Surge performance

Note : Dimensions, Resistance range, TC,

Peak surge power

FRN UniOhm Axial Fusible SCM100/SWM100 Pulse withstanding Fusible Style/Fusing Characteristics, Dimensions

Note : Fusing Characteristic, Dimensions,

Resistance range

[Attention!] Information provided herewithin is intended for REFERENCE only.

Please consult your sales representative for detail information before placing orders.

Cross refenece table - Firstohm vs. Other Major Makers

Possible Inter-packaging-style Cross

Direct Cross