Chip Resistors-Surface Mount

Part Number	Description / PDF	Quantity
VSML2512S2-0M80F Delta Electronics	RES SMD 800 UOHM 1% 2W 2512	2000
RLT1220-3-R200-JNH Delta Electronics	RES 0.2 OHM 5% 1/4W 0805	10000
PFR02S-750-FNH Delta Electronics	RES SMD 75 OHM 1% 1/32W 01005	30375
SCMM2512S3-0M80F Delta Electronics	RES SMD 800 UOHM 1% 3W 2512	3304
PFR03S-473-FNH Delta Electronics	RES 47K OHM 1% 1/20W 0201	27400
PFR02S-204-FNH Delta Electronics	RES 200K OHM 1% 1/32W 01005	58319
PFR05S-4993-FNH Delta Electronics	RES SMD 499 KOHM 1% 1/16W 0402	563152
VSRP1206SD-R030F Delta Electronics	RES 0.03 OHM 1% 1/2W 1206	3900
PFR02S-241-FNH Delta Electronics	RES SMD 240 OHM 1% 1/32W 01005	37238
RLT1220-3-4R70-JNH Delta Electronics	RES SMD 4.7 OHM 5% 1/4W 0805	10000
PFR03S-330-JNH Delta Electronics	RES SMD 33 OHM 5% 1/20W 0201	9849
RLT1220-F-R470-JNH Delta Electronics	RES 0.47 OHM 5% 1/3W 0805	10000
PFR05S-131-FNH Delta Electronics	RES SMD 130 OHM 1% 1/16W 0402	59748
VSRP1206SD-R020J Delta Electronics	RES 0.02 OHM 5% 1/2W 1206	4000
PFR02S-153-FNH Delta Electronics	RES 15K OHM 1% 1/32W 01005	15083
PFR02S-561-JNH Delta Electronics	RES SMD 560 OHM 5% 1/32W 01005	139880
PFR03S-4R7-JNH Delta Electronics	RES SMD 4.7 OHM 5% 1/20W 0201	39900
RL-1005-1-R050-FNH Delta Electronics	RES 0.05 OHM 1% 1/16W 0402	17145
RLT0510-2-1R00-JNH Delta Electronics	RES SMD 1 OHM 5% 1/8W 0402	10000
PFR03S-272-JNH Delta Electronics	RES 2.7K OHM 5% 1/20W 0201	50000

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