Chip Resistors-Surface Mount

Image	Part Number	Description / PDF	Quantity	Rfq
	RN73R2ATTD2491F50 KOA Speer Electronics, Inc.	RES 2.49K OHM 1% 1/8W 0805	0
	RN73H2BTTD84R5D25 KOA Speer Electronics, Inc.	RES 84.5 OHM 0.5% 1/4W 1206	0
	RN73H2ATTD3051A05 KOA Speer Electronics, Inc.	RES 3.05K OHM 0.05% 1/8W 0805	0
	RN73H2BTTD1890D10 KOA Speer Electronics, Inc.	RES 189 OHM 0.5% 1/4W 1206	0
	RN73H2BTTD4320C50 KOA Speer Electronics, Inc.	RES 432 OHM 0.25% 1/4W 1206	0
	RK73H1HTTC7322D KOA Speer Electronics, Inc.	RES 73.2K OHM 0.5% 1/20W 0201	0
	SG73P2ATTD130J KOA Speer Electronics, Inc.	RES 13 OHM 5% 1/4W 0805	0
	RK73H2ARTTD9761D KOA Speer Electronics, Inc.	ANTI SULFURATION PRECISION CHIP	0
	RN73R2BTTD6341B05 KOA Speer Electronics, Inc.	RES 6.34K OHM 0.1% 1/4W 1206	0
	RN73R1JTTD2550A10 KOA Speer Electronics, Inc.	RES 255 OHM 0.05% 1/10W 0603	0
	RN73R1JTTD6201F25 KOA Speer Electronics, Inc.	RES 6.2K OHM 1% 1/10W 0603	0
	RN73R2ATTD8982B25 KOA Speer Electronics, Inc.	RES 89.8K OHM 0.1% 1/8W 0805	0
	SG73P2ETTD9531D KOA Speer Electronics, Inc.	RES 9.53K OHM 0.5% 1/2W 1210	0
	RN73H2BTTD3012B50 KOA Speer Electronics, Inc.	RES 30.1K OHM 0.1% 1/4W 1206	0
	RN73H2ETTD3051A10 KOA Speer Electronics, Inc.	RES 3.05K OHM 0.05% 1/4W 1210	0
	RN73R2BTTD6650B10 KOA Speer Electronics, Inc.	RES 665 OHM 0.1% 1/4W 1206	0
	RN73H2BTTD8870B50 KOA Speer Electronics, Inc.	RES 887 OHM 0.1% 1/4W 1206	0
	RN73R2BTTD8872A25 KOA Speer Electronics, Inc.	RES 88.7K OHM 0.05% 1/4W 1206	0
	RK73G2BTTD5230D KOA Speer Electronics, Inc.	RESISTOR THICK FILM 1206	0
	RN73R2ETTD2152F10 KOA Speer Electronics, Inc.	RESISTOR THIN FILM 1210 SIZE 1%	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