KOA Speer...

A Leader in
Anti-Sulfuration
Chip Resistors & Arrays


Silver-based inner electrodes in flat chip resistors can lose conductivity when the silver reacts with sulfur in a high-sulfur environment. The electrodes can lose all conductivity and disconnect the circuit as sulfuration continues. KOA Speer has developed a complete line of anti-sulfur chip resistors and arrays to protect against sulfuration of the resistor electrodes.

Features:

  • Excellent anti-sulfuration characteristics due to use of high sulfuration-proof inner top electrode material
  • Excellent heat resistance and environmental resistance by applying metal glaze thick film to resistive film
  • AEC-Q200 Qualified
  • Passes ASTM-B809 anti-sulfuration testing

Anti-Sulfur Performance Comparison

Why Choose Anti-Sulfur?

Sulfuration is a phenomenon that occurs in resistors with silver-based inner electrodes. When a resistor is used in a high-sulfur atmosphere, the sulfur molecules can migrate between the protective film and the outer electrode to the inner electrode, where they react to form silver sulfide. Silver sulfide is an insulator, and the resistance of the device increases toward an open circuit. KOA's product line includes resistors with sulfuration-resistant inner electrodes.

Chip Resistor Disconnected by Sulfuration

Needle crystals of
silver sulfide (Ag2S)

KOA Speer's Family of
Anti-Sulfur Chip
Resistors & Arrays


General Purpose

RK73B-RT

- ±2%, ±5% General Purpose Flat Chip Resistor


RK73H-RT

- ±0.5%, ±1% High Precision Flat Chip Resistor


RK73Z-RT

- Zero ohm with max. resistance of 50mΩ



High Precision

RK73G-RT

- ±0.5%, ±1% Ultra Precision Flat Chip Resistor



High Voltage

NEW! HV73V-RT

- High Voltage Flat Chip Resistor for Automotive


HV73-RT

- High Voltage Flat Chip Resistor



Anti-Surge

SG73-RT

- Surge Resistor with 10x pulse power capability


SG73P-RT, SG73S-RT

- Anti-Pulse & Anti-Surge Current Flat Chip Resistors



High Power (Wide Terminal

WK73-RT

- Wide Terminal, Reverse Geometry Resistor



Network

CN-RT,
CN_K-RT

- Concave, Square Corner Isolated Chip Array Network


Structural Chart of Flat Chip Resistor (Standard)


Resistors

General purpose 2%, 5% tolerance thick film chip resistor

RK73B

Precision 0.5%, 1% tolerance thick film chip resistor

RK73H

Thick film 0.5%, 1% tolerance, 50ppm/°C chip resistor

RK73G

Flat chip resistor (Anti-Sulfuration)

RK73-RT

Flat chip resistor (Ultra precision grade, Anti-Sulfuration) .

RK73G-RT

Flat thick film resistors (for embedded substrates)

XR73B/XR73H/XR73Z

Wide terminal type flat chip resistor

WK73R

Higher power wide terminal type flat chip resistor

WK73R (Higher Power)

Wide terminal type flat chip resistor (Anti-Sulfuration)

WK73-RT

Higher power wide terminal type flat chip resistor (Anti-Sulfuration)

WK73-RT (Higher Power)

Ultra precision 0.05%, 0.1%, 1% tolerance thin film chip resistor .

RN73

High heat resistance metal film chip resistor

RN73H

Microwave thin film chip resistors

SHDR

Flat chip resistors for high voltage

HV73

Flat chip resistors for high voltage (Anti-Sulfuration)

HV73-RT

Flat chip resistors for high voltage (Automotive)

HV73V

Flat chip resistors for high voltage (Automotive– Anti-Sulfuration)

HV73V-RT

Anti-surge thick film chip resistor

SG73

Surge current flat chip resistors (anti-surge, anti-sulfuration)

SG73-RT

Pulse/surge current thick film chip resistor

SG73P

Pulse/surge current thick film chip resistor

SG73S

Pulse/surge current thick flat chip resistor (Anti-Sulfuration)

SG73P-RT

Pulse/surge current thick flat chip resistor (Anti-Sulfuration)

SG73S-RT

Zero ohm jumper chip resistor

RK73Z

Fusing flat chip resistor

RF73

Lo-ohm 0.5%, 1%, 2%, 5% tolerance thick film current sense resistor

SR73

Higher Power surge current thick film chip resistor

SR73 (Higher Power)

Surge current thick film chip resistor(Anti-Sulfuration)

SR73-RT

Current sensing chip resistor

UR73

Low resistance flat chip resistor

UR73V

Wide terminal, low resistance flat chip resistor

WU73

Wide terminal type current sense flat chip resistor

WK73S

Higher power wide terminal current sense flat chip resistor

WK73S (Higher Power)

Large current shunt resistor

HS

Current sensing power shunt

PSJ2

Current sensing power shunt

PSL2

Current sensing power shunt

PSG4

Current sensing power shunt

PSF4

Chip type power shunt resistor

PSB

Chip type power shunt resistor

PSI/PSE

Metal plate chip type low resistance resistor

TLR1E/2A, TLRZ

Metal plate current sense resistor

TLR2B, 2H, 3A, 3AW

Metal plate current sense resistor

TLR-2BW, 2BP, 2HW, 3AP, 3APS

Metal plate chip type low resistance resistors

TLRH

Surface mount molded current sense resistors

SL07, 1, 2, 3, SLN2, SLZ, TSL

Surface mount molded current sense resistors

SLW07, SLW1, SLN3, SLN5

Ceramic case surface mount resistor

BLR

Metal plate current sense resistors

LR72A, B, C

Four-terminal current sense resistor

CSR

Ultra precision 0.05%, 0.1%, 1% tolerance thin film chip resistor .

RN73

High heat resistance metal film chip resistor

RN73H

Fixed carbon film melf resistor

RD41

Fixed metal film melf resistors

RN41, RM41

Zero ohm melf resistor

CC

Fixed ceramic melf resistor

CPCN

Concave termination with square corners resistor array

CN

Convex termination with square corners resistor array

CN___K/N

Anti sulfuration chip networks (concave termination)

CN-RT

Anti sulfuration chip networks (convex termination)

CN-KRT

Bussed square corner resistor array

CND

Bussed concave termination square corner resistor array

CNB

Convex termination with scalloped corners resistor array

CN___A

Zero ohm jumper resistor array

CNZ

Ball grid array (BGA) resistor network

BR

Thin film chip networks

CNN

Integrated passive components

RB(X), RD(X), RT(X)

Isolated and custom resistor networks

RIA, RNX

Precision voltage divider

RTY

R/C filter networks

TF(X)

Diode terminator networks

DN(X)

AC terminator networks

AC(X)

Precision metal film resistor SIP network

MRP

Thick film SIP resistors

RKC, RKH, RKL

CR networks

CR

Carbon film leaded resistors

CF

General purpose metal film leaded resistor

MF, MFS, RK

Radial metal film leaded resistors

LF, LFF, RK26

Jumper wire

JL

Zero ohm jumpers

Z, J

Anti-surge power type leaded resistor

RCR

High voltage high resistance thick film resistors

GS

High voltage thick film resistor

RK92

High voltage thick film discharge resistor

RK92L

Ceramic resistors for anti pulse surge

HPC

Ceramic resistors for anti pulse surge

PCF

High voltage power resistors

PSN, PV, PSO, PN, PWW, PAP

MIL approved metal film leaded resistor

RNS

Plate-shaped high precision metal film resistor

MRS

Insulated super miniature precision metal film resistor

SF

Reduced size metal oxide power type leaded resistor

MOS

Metal oxide power type leaded resistor

MO

Power carbon film leaded resistor

SPR

Coat-insulated, precision coat-insulated and miniature wirewound leaded resistors

CW, CWP, CWH

Coat-insulated wirewound resistor (with fusing functional)

CWFS

Coat-insulated miniature precision power wirewound resistors

RW

Rectangular type wirewound resistors

BGR, BWR, BSR

Rectangular type metal plate resistor

BPR

Custom milliohm resistor

LR

Coat-insulated fusing resistor

RF

Coat-insulated fusing resistor (Constant current fusing type)

RF25CC

Coat-insulated fusing resistor (L type)

RF26

Thermal fuse built-in resistor

WF

Anti-surge fusing resistor

TPR

Anti-surge power type leaded resistor

RCR

Ceramic resistors for anti pulse surge

HPC

Ceramic resistors for anti pulse surge

PCF

Rectangular type metal plate resistor

BPR

Custom milliohm resistor

LR

Thermal Protection

Negative tempco thermistor

NT73

SMD platinum thin film thermal chip sensors

SDT73H/SDT73S

SMD platinum thin film thermal chip sensors (Automotive)

SDT73V

Platinum thin film thermal sensors

SDT101

Small type platinum thin film thermal sensors (Narrow)

SDT310HCTP

Small type platinum thin film thermal sensor (Small heater element)

SDT310VASP

Platinum thin film thermal sensors

SDT310

Thermal sensors

ST

Air flow sensor units

AFS

Linear positive tempco thermistor

LT73

Linear positive temperature coefficient flat chip resistors

LT73V

Thin film resistance thermal chip sensor

LP73

Thick film linear positive tempco thermistor

LA73

Linear positive tempco melf resistor

MLT

Linear positive miniature tempco thermistor

LT

Thin film resistance thermal sensor

LP

Inductors

Multilayer ceramic inductor

MHL

Thin film inductor

KL73

High current inductor

KQC

High Q inductor

KQ

Power chip inductor

LPC4235, LPC4545

Choke coil inductor

LPC

Shielded choke coil inductor

LCM1060

Power chip inductors shielded type

LKS

Custom wirewound coil

LWA

Transponder coil (Rx)

KT11835

Capacitors

Ceramic chip capacitors

NPO, X5R, X7R, Y5V

EMI/EMC Filtering

Multilayer ferrite bead

CZB

Multilayer power ferrite bead

CZP

Circuit Protection

Thin film chip fuse

TF

Chip current fuse (Automotive)

TF16VN

Chip fuse

CCP

Chip fuse

CCF1N

Chip fuse (IEC)

CCF1F

Metal oxide varistor

NV73

Multilayer type metal oxide varistors (Automotive)

NV73DL

Load dump surge varistors (Automotive)

NV73DS

Metal oxide varistor (Nonflammable coated)

NVF

Metal oxide varistor disc type

NVD

Surge absorber

SA

Test point chip

RC

Modules

LTCC multilayer substrates

KLC

Hybrid IC

KA

Multi-chip module

MCM

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