Resistors-Through Hole

Part Number	Description / PDF	Quantity
23J7R5 Ohmite	RES 7.5 OHM 5% 3W AXIAL	0
TEH100M3R00FE Ohmite	RES 3 OHM 1% 100W TO247-2	211
B8J3K5E Ohmite	RES 3.5K OHM 5% 8W AXIAL	1830
43J350E Ohmite	RES 350 OHM 5% 3W AXIAL	0
45F470E Ohmite	RES 470 OHM 1% 5W AXIAL	224
TWW20J7R5E Ohmite	RES 7.5 OHM 5% 20W RADIAL	139
B20J1K5E Ohmite	RES 1.5K OHM 5% 20W AXIAL	2340
TBH25P330RJE Ohmite	RES 330 OHM 5% 25W TO220-2	0
23J7R5E Ohmite	RES 7.5 OHM 5% 3W AXIAL	302
AP836 1K J Ohmite	RES 1K OHM 5% 35W TO220-2	0
23J1K2 Ohmite	RES 1.2K OHM 3W 5% AXIAL	39
23J5K6 Ohmite	RES 5.6K OHM 3W 5% AXIAL	22
41FR30E Ohmite	RES 300M OHM 1% 1W AXIAL	251
B20J12K5E Ohmite	RES 12.5K OHM 5% 20W AXIAL	0
43J7K5E Ohmite	RES 7.5K OHM 3W 5% AXIAL	33
SM102033004FE Ohmite	RES 3M OHM 1% 1W RADIAL	434
25J3R0 Ohmite	RES 3 OHM 5W 5% AXIAL	21
43F4R0E Ohmite	RES 4 OHM 1% 3W AXIAL	9
42J3K0E Ohmite	RES 3K OHM 5% 2W AXIAL	0
SM104032005FE Ohmite	RES 20M OHM 1% 1.5W RADIAL	2314

Resistors-Through Hole

1. Overview

Through Hole Resistors (THRs) are axial-leaded electronic components designed to limit current flow and divide voltages in circuits. They are mounted by inserting leads into printed circuit board (PCB) holes and soldering on the reverse side. As foundational passive components, THRs maintain circuit stability and precision across industries. Despite the rise of surface-mount devices, THRs remain critical for high-power applications and prototyping due to their durability and ease of manual handling.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Carbon Film Resistors	Low noise, stable performance, cost-effective	General-purpose electronics, consumer devices
Metal Film Resistors	High precision ( 0.1% tolerance), low temperature coefficient	Medical instruments, test equipment
Wirewound Resistors	High power handling (up to 50W), accurate resistance values	Power supplies, industrial machinery
Ceramic Composition Resistors	High surge current resistance	Power line filters, lighting ballasts
Fusible Resistors	Acts as both resistor and fuse	Overcurrent protection in power circuits

3. Structure and Composition

Typical THRs feature:

Lead Wires: Tin-plated copper or silver alloys for solderability
Resistive Element: Carbon/metal film or wound nichrome wire
Insulating Body: Ceramic or glass-epoxy coating
Marking: Color bands (EIA-438B standard) or printed text

Advanced designs incorporate flame-retardant coatings and precision laser-trimmed elements for 0.01% tolerance.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Resistance Value	1 to 100M	Determines current/voltage control
Power Rating	1/8W to 50W	Defines maximum power dissipation
Tolerance	0.01% to 5%	Indicates resistance accuracy
Temperature Coefficient	5ppm/ C to 300ppm/ C	Measures stability over temperature
Voltage Rating	200V to 1000V	Prevents dielectric breakdown

5. Application Fields

Consumer Electronics: Power management in TVs, audio equipment
Industrial Control: Motor speed controllers, PLC systems
Telecommunications: Signal conditioning in base stations
Automotive: Engine control units, LED lighting systems
Medical Devices: Precision measurement in diagnostic equipment

Case Study: Metal film resistors in ECG machines provide 0.1% tolerance for accurate heart signal detection.

6. Leading Manufacturers and Products

Manufacturer	Key Products
Vishay Precision Group	Y1485 series ( 0.005% tolerance wirewound)
Yageo Corporation	MF-RC series (metal film, 1/4W to 2W)
Panasonic Electronic Components	EVR series (ceramic composition, 250V rating)
Bourns Inc.	CR2800 series (fusible resistors)

7. Selection Guidelines

Key considerations:

Determine required power dissipation (select 2x calculated wattage)
Match tolerance to application needs (e.g., 0.1% for audio amplifiers)
Verify temperature coefficient for operating environment
Consider voltage ratings for high-voltage circuits
Check RoHS compliance for environmental regulations

Example: Selecting a 10 , 10W wirewound resistor for a 24V DC motor driver circuit.

8. Industry Trends

Current development directions:

Miniaturization while maintaining power ratings (e.g., 5W resistors in 1210 package)
Advancements in laser trimming for sub-ppm level precision
Adoption of eco-friendly materials meeting REACH/SVHC standards
Integration with smart manufacturing systems for automated placement
Development of high-temperature resistant models (up to 300 C operating)

Market growth projections indicate a CAGR of 4.2% through 2030, driven by automotive electronics demand.