Chip Resistors-Surface Mount

Image	Part Number	Description / PDF	Quantity	Rfq
	RS73G2BTTD1690B KOA Speer Electronics, Inc.	RES 169 OHM 0.1% 1/3W 1206	0
	RN73R2ATTD7412F100 KOA Speer Electronics, Inc.	RES 74.1K OHM 1% 1/8W 0805	0
	SR732ATTD6R65D KOA Speer Electronics, Inc.	CURRENT SENSE RESISTOR	0
	RN73R2ETTD6983F100 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RN73H1ETTP1152C25 KOA Speer Electronics, Inc.	RES 11.5K OHM 0.25% 1/16W 0402	0
	RN73H1ETTP1291F25 KOA Speer Electronics, Inc.	RES 1.29K OHM 1% 1/16W 0402	0
	RS73F1JTTD2260F KOA Speer Electronics, Inc.	RES 226 OHM 1% 1/5W 0603	0
	SG732ETTD105K KOA Speer Electronics, Inc.	RES 1M OHM 10% 1/2W 1210	0
	RN73R1JTTD69R8B10 KOA Speer Electronics, Inc.	RES 69.8 OHM 0.1% 1/10W 0603	0
	RN73H1JTTD53R6A25 KOA Speer Electronics, Inc.	RES 53.6 OHM 0.05% 1/10W 0603	0
	RN73R2ETTD21R8F50 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RN73R1ETTP9311B50 KOA Speer Electronics, Inc.	RES 9.31K OHM 0.1% 1/16W 0402	0
	SR731JRTTD6R04F KOA Speer Electronics, Inc.	RES 6.04 OHM 1% 1/5W 0603	0
	RN73H2ATTD6420F25 KOA Speer Electronics, Inc.	RES 642 OHM 1% 1/8W 0805	0
	RN73H2ETTD7320A25 KOA Speer Electronics, Inc.	RES 732 OHM 0.05% 1/4W 1210	0
	RN73H1JTTD3613B25 KOA Speer Electronics, Inc.	RES 361K OHM 0.1% 1/10W 0603	0
	RN73R2ATTD67R3F10 KOA Speer Electronics, Inc.	RES 67.3 OHM 1% 1/8W 0805	0
	RN73R2ETTD9423B50 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RN73R2ATTD34R8B50 KOA Speer Electronics, Inc.	RES 34.8 OHM 0.1% 1/8W 0805	0
	RN73H2ETTD2611B10 KOA Speer Electronics, Inc.	RES 2.61K OHM 0.1% 1/4W 1210	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