Chip Resistors-Surface Mount

Part Number	Description / PDF	Quantity
RLT0510-7-R680-FNH Delta Electronics	RES 0.68 OHM 1% 1/6W 0402	9650
PFR03S-1213-FNH Delta Electronics	RES 121K OHM 1% 1/20W 0201	50000
PFR02S-2212-FNH Delta Electronics	RES 22.1K OHM 1% 1/32W 01005	13993
PFR02S-33R2-FNH Delta Electronics	RES SMD 33.2 OHM 1% 1/32W 01005	56186
PFR02S-473-FNH Delta Electronics	RES 47K OHM 1% 1/32W 01005	58306
PFR02S-49R9-FNH Delta Electronics	RES SMD 49.9 OHM 1% 1/32W 01005	31539
RLT1220-3-1R00-JNH Delta Electronics	RES SMD 1 OHM 5% 1/4W 0805	10000
PFR05S-104-FNH Delta Electronics	RES SMD 100 KOHM 1% 1/16W 0402	909408
RLT1220-F-2R00-JNH Delta Electronics	RES SMD 2 OHM 5% 1/3W 0805	10000
PFR03S-270-JNH Delta Electronics	RES SMD 27 OHM 5% 1/20W 0201	40000
VSRP2512S1-R200J Delta Electronics	RES 0.2 OHM 5% 1W 2512	2000
PFR05S-105-FNH Delta Electronics	RES SMD 1 MOHM 1% 1/16W 0402	910065
RLM-1632W-4F-R001-FNH Delta Electronics	RES 0.001 OHM 1% 1/2W 1206	5000
RL-1220-4-R005-FNH Delta Electronics	RES 0.005 OHM 1% 1/2W 0805	7663
PFR03S-105-JNH Delta Electronics	RES SMD 1 MOHM 5% 1/20W 0201	16189
PFR05S-332-JNH Delta Electronics	RES SMD 3.3 KOHM 5% 1/16W 0402	78976
VSRP1206SD-R050F Delta Electronics	RES 0.05 OHM 1% 1/2W 1206	3950
PFR03S-103-FNH Delta Electronics	RES SMD 10K OHM 1% 1/20W 0201	303269
VSRP1206S1-R050J Delta Electronics	RES 0.05 OHM 5% 1W 1206	4000
RLT1220-3-R150-JNH Delta Electronics	RES 0.15 OHM 5% 1/4W 0805	10000

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