Chip Resistors-Surface Mount

Part Number	Description / PDF	Quantity
ERJ-U1TJ432U Panasonic	RES 4.3K OHM 5% 1W 2512 SMD	0
ERJ-U01F3402C Panasonic	RES 34K OHM 1% 1/20W 0201 SMD	0
ERA-3AEB6342V Panasonic	RES SMD 63.4KOHM 0.1% 1/10W 0603	788
ERJ-1TNF28R7U Panasonic	RES SMD 28.7 OHM 1% 1W 2512	8654
ERJ-U01F5902C Panasonic	RES 59K OHM 1% 1/20W 0201 SMD	0
ERJ-U01F4532C Panasonic	RES 45.3K OHM 1% 1/20W 0201 SMD	0
ERJ-U01F6042C Panasonic	RES 60.4K OHM 1% 1/20W 0201 SMD	0
ERA-2AEB3481X Panasonic	RES SMD 3.48KOHM 0.1% 1/16W 0402	4763
ERJ-14NF2152U Panasonic	RES SMD 21.5K OHM 1% 1/2W 1210	6453
ERA-3VRW9762V Panasonic	RES 97.6K OHM 0.05% 1/8W 0603	0
ERJ-P08F1271V Panasonic	RES SMD 1.27 KOHM 1% 2/3W 1206	0
ERJ-8BWFR056V Panasonic	RES 0.056 OHM 1% 1W 1206	1
ERJ-T14J433U Panasonic	RES SMD 43K OHM 5% 1/2W 1210	0
ERA-2AED433X Panasonic	RES SMD 43K OHM 0.5% 1/16W 0402	9515
ERA-8AEB5492V Panasonic	RES SMD 54.9K OHM 0.1% 1/4W 1206	6563
ERA-1ARB7870C Panasonic	RES SMD 787 OHM 0.1% 1/20W 0201	700
ERJ-H3EF2943V Panasonic	RES 294K OHM 1% 1/6W 0603	0
ERJ-1GEF1822C Panasonic	RES SMD 18.2K OHM 1% 1/20W 0201	55952
ERJ-U06J624V Panasonic	RES 620K OHM 5% 1/8W 0805 SMD	0
ERJ-PB6B4750V Panasonic	RES SMD 475 OHM 0.1% 1/4W 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