Chip Resistors-Surface Mount

Image	Part Number	Description / PDF	Quantity	Rfq
	RN731JTTD3901C50 KOA Speer Electronics, Inc.	RES 3.9K OHM 0.25% 1/16W 0603	0
	RN73H2ETTD7230C50 KOA Speer Electronics, Inc.	RES 723 OHM 0.25% 1/4W 1210	0
	RN73R1ETTP1171C25 KOA Speer Electronics, Inc.	RES 1.17K OHM 0.25% 1/16W 0402	0
	RN73H2ETTD8982D10 KOA Speer Electronics, Inc.	RES 89.8K OHM 0.5% 1/4W 1210	0
	RN73R2BTTD5561B50 KOA Speer Electronics, Inc.	RES 5.56K OHM 0.1% 1/4W 1206	0
	SG73S2BTTD2802D KOA Speer Electronics, Inc.	RES 28K OHM 0.5% 1/3W 1206	0
	RN73R1ETTP1761C25 KOA Speer Electronics, Inc.	RES 1.76K OHM 0.25% 1/16W 0402	0
	RN73H2ATTD1381B50 KOA Speer Electronics, Inc.	RES 1.38K OHM 0.1% 1/8W 0805	0
	SG73P2BTTD4701F KOA Speer Electronics, Inc.	RES 4.7K OHM 1% 1/3W 1206	0
	RN73R2BTTD1403B25 KOA Speer Electronics, Inc.	RES 140K OHM 0.1% 1/4W 1206	0
	RN73R1ETTP8981B25 KOA Speer Electronics, Inc.	RES 8.98K OHM 0.1% 1/16W 0402	0
	WK73R2BTTD2550D KOA Speer Electronics, Inc.	RES 255 OHM 0.5% 1W 1206	0
	RN73H2ETTD8063C50 KOA Speer Electronics, Inc.	RES 806K OHM 0.25% 1/4W 1210	0
	SG73P1ETTP431J KOA Speer Electronics, Inc.	RES 430 OHM 5% 1/8W 0402	0
	RN731JTTD9760F25 KOA Speer Electronics, Inc.	RES 976 OHM 1% 1/16W 0603	0
	RS73G2BTTD1023C KOA Speer Electronics, Inc.	RES 102K OHM 0.25% 1/3W 1206	0
	RN73R2ATTD9093F100 KOA Speer Electronics, Inc.	RES 909K OHM 1% 1/8W 0805	0
	RN73R2BTTD1802D25 KOA Speer Electronics, Inc.	RES 18K OHM 0.5% 1/4W 1206	0
	SG73P1JTTD4423D KOA Speer Electronics, Inc.	RES 442K OHM 0.5% 1/3W 0603	0
	RN73R2ATTD1842D25 KOA Speer Electronics, Inc.	RES 18.4K OHM 0.5% 1/8W 0805	0

Chip Resistors-Surface Mount

1. Overview

Surface Mount Chip Resistors (SMD Resistors) are passive electronic components designed to limit current flow and divide voltages in printed circuit boards (PCBs). As key elements in Surface Mount Technology (SMT), they enable high-density PCB layouts and automated manufacturing. Their miniaturized footprint and reliability make them essential for modern electronics, including smartphones, automotive systems, and industrial equipment.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Thick Film Resistors	Cost-effective, standard tolerance ( 1%-5%), power ratings up to 1W	Consumer electronics, power supplies
Thin Film Resistors	High precision ( 0.01%), low noise, stable temperature coefficients	Medical devices, precision instrumentation
Power Resistors	High power dissipation (up to 3W), robust thermal management	Motor drives, EV battery management systems
Network Resistors	Multiple resistors in single package, matched temperature coefficients	Digital circuits, memory modules
Wirewound Resistors	High inductance, precise low-resistance values	Audio amplifiers, industrial control systems

3. Structure and Composition

Typical SMD resistors consist of: - Ceramic substrate (Alumina, 96% Al₂O₃) - Resistive layer (Ruthenium oxide for thick film, Nichrome for thin film) - Termination electrodes (Ni/Sn or Ag/Pd metallization) - Protective coating (Epoxy or glass encapsulation) Standard packages follow EIA dimensions (e.g., 0402, 0603, 0805).

4. Key Technical Specifications

Parameter	Description	Importance
Resistance Range	1 to 10M (film), 0.1 to 100k (power)	Determines current control capability
Tolerance	0.01% (precision) to 5% (general)	Impacts circuit accuracy
Power Rating	0.05W to 3W @ 70 C	Defines thermal dissipation limits
TCR	5ppm/ C (thin film) to 200ppm/ C	Affects stability over temperature
Operating Temp	-55 C to +155 C	Defines environmental reliability
Voltage Coefficient	<0.1ppm/V	Ensures voltage stability

5. Application Fields

Consumer Electronics: Smartphones, wearables, IoT devices
Automotive: ADAS sensors, battery management systems, ECUs
Industrial: PLCs, motor drives, power converters
Telecom: 5G base stations, optical transceivers
Medical: Diagnostic equipment, implantable devices

6. Leading Manufacturers and Products

Manufacturer	Representative Series	Key Features
Yageo	CRCW Series	0.05W-1W, 0.1% tolerance
Vishay	CRCWE Series	Thin film, TCR 25ppm/ C
ROHM	MCR Series	Power resistors up to 2W
Ohmite	PWR Series	High-power 3W devices
Bourns	CRCU Series	Network resistors with 8-element arrays

7. Selection Recommendations

Consider: - Required resistance tolerance and power rating - Operating temperature range (automotive needs -40 C to +125 C) - Package size constraints (e.g., 0402 for mobile devices) - Long-term stability requirements (medical applications prefer thin film) - Cost vs. performance trade-offs (consumer vs. industrial use) Example: For smartphone power management, select 0603 thick film resistors with 1% tolerance and 125 C rating.

8. Industry Trends

Key trends include: - Miniaturization: Development of 0201 and 01005 packages - Higher precision: Sub-0.01% tolerance thin film resistors - Enhanced thermal management: New materials for power densities >1W/mm - Automotive growth: AEC-Q200 qualified parts for EVs - Smart manufacturing: AI-driven resistor selection tools - Sustainability: Lead-free and halogen-free material adoption