Chip Resistors-Surface Mount

Image	Part Number	Description / PDF	Quantity	Rfq
	RN73R2BTTD5171A25 KOA Speer Electronics, Inc.	RES 5.17K OHM 0.05% 1/4W 1206	0
	RN73H2BTTD9533F50 KOA Speer Electronics, Inc.	RES 953K OHM 1% 1/4W 1206	0
	RN73H2ETTD6200D100 KOA Speer Electronics, Inc.	RES 620 OHM 0.5% 1/4W 1210	0
	RN73R2ETTD2432B50 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RK73H1ERTTP7504F KOA Speer Electronics, Inc.	RES 7.5M OHM 1% 1/10W 0402	0
	RN73R2ETTD1930C10 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RN73H2BTTD5762D10 KOA Speer Electronics, Inc.	RES 57.6K OHM 0.5% 1/4W 1206	0
	RN73R2ETTD41R2F50 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RN73H2BTTD1182C25 KOA Speer Electronics, Inc.	RES 11.8K OHM 0.25% 1/4W 1206	0
	RN73H1JTTD4483D100 KOA Speer Electronics, Inc.	RES 448K OHM 0.5% 1/10W 0603	0
	RN73H1JTTD1740B25 KOA Speer Electronics, Inc.	RES 174 OHM 0.1% 1/10W 0603	0
	RK73G2ATTD1502C KOA Speer Electronics, Inc.	THICKFILM RESISTOR 0805	0
	RN73R1JTTD2372F100 KOA Speer Electronics, Inc.	RES 23.7K OHM 1% 1/10W 0603	0
	RN73H1ETTP4372F50 KOA Speer Electronics, Inc.	RES 43.7K OHM 1% 1/16W 0402	0
	RN73H1ETTP6900D25 KOA Speer Electronics, Inc.	RES 690 OHM 0.5% 1/16W 0402	0
	RN73R2BTTD1982F25 KOA Speer Electronics, Inc.	RES 19.8K OHM 1% 1/4W 1206	0
	RN731JTTD3002B25 KOA Speer Electronics, Inc.	RES 30K OHM 0.1% 1/16W 0603	0
	SG73P2ETTD2551F KOA Speer Electronics, Inc.	RES 2.55K OHM 1% 1/2W 1210	0
	RN73R2ATTD2152C50 KOA Speer Electronics, Inc.	RES 21.5K OHM 0.25% 1/8W 0805	0
	RN731JTTD2700D25 KOA Speer Electronics, Inc.	RES 270 OHM 0.5% 1/16W 0603	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