Chip Resistors-Surface Mount

Image	Part Number	Description / PDF	Quantity	Rfq
	RN73H2BTTD1171F10 KOA Speer Electronics, Inc.	RES 1.17K OHM 1% 1/4W 1206	0
	RN73R1ETTP36R0D50 KOA Speer Electronics, Inc.	RES 36 OHM 0.5% 1/16W 0402	0
	RS73F2ATTD2211D KOA Speer Electronics, Inc.	RES 2.21K OHM 0.5% 1/4W 0805	0
	RN73H2BTTD2401C10 KOA Speer Electronics, Inc.	RES 2.4K OHM 0.25% 1/4W 1206	0
	RK73H2ARTTD2674F KOA Speer Electronics, Inc.	ANTI SULFURATION PRECISION CHIP	0
	SR732BRTTDR82J KOA Speer Electronics, Inc.	RES 820M OHM 5% 1/3W 1206	0
	RS73F2BTTD45R3B KOA Speer Electronics, Inc.	RES 45.3 OHM 0.1% 1/3W 1206	0
	WK73R3ATTE24R9F KOA Speer Electronics, Inc.	RES 24.9 OHM 1% 2W 2512	0
	RS73F2ATTD2202B KOA Speer Electronics, Inc.	RES 22K OHM 0.1% 1/4W 0805	0
	HV733ATTE2264F KOA Speer Electronics, Inc.	RES 2.26M OHM 1% 1W 2512	0
	RN73R2ETTD1913F50 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	0
	RN73H2BTTD5761F100 KOA Speer Electronics, Inc.	RES 5.76K OHM 1% 1/4W 1206	0
	RN73R2ATTD5560F100 KOA Speer Electronics, Inc.	RES 556 OHM 1% 1/8W 0805	0
	RN73R2ATTD3001B25 KOA Speer Electronics, Inc.	RES 3K OHM 0.1% 1/8W 0805	0
	RS73F2ATTD3740D KOA Speer Electronics, Inc.	RES 374 OHM 0.5% 1/4W 0805	0
	RN73H2BTTD1230F100 KOA Speer Electronics, Inc.	RES 123 OHM 1% 1/4W 1206	0
	RK73G1ETTP5762D KOA Speer Electronics, Inc.	RES 57.6K OHM 0.5% 1/10W 0402	0
	RN73H2ETTD15R6B25 KOA Speer Electronics, Inc.	RES 15.6 OHM 0.1% 1/4W 1210	0
	RN73H1JTTD6420D25 KOA Speer Electronics, Inc.	RES 642 OHM 0.5% 1/10W 0603	0
	RN73R2ATTD3440D50 KOA Speer Electronics, Inc.	RES 344 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