Ohmite 42J680 680 Ohm 2W Axial Wirewound Resistor Equivalent & Substitute Parts

Part Overview

The Ohmite 42J680 is a 680 Ohm, ±5% tolerance, 2W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is designed for applications requiring precision resistive elements with moderate power dissipation in compact axial configurations. The part maintains active product status with 656 units currently in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative packaging configurations are required.

Substiute Parts

42J680

OhmiteIn Stock: 74642J680 Datasheet

Current PartRFQ

42J680E

OhmiteIn Stock: 121142J680E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Ohmite 42J680 is determined by strict equivalence across the following electrical and mechanical parameters:

• Resistance Value: 680 Ohms (exact match required)
• Tolerance: ±5% (defines acceptable resistance range)
• Power Rating: 2W (minimum dissipation capability)
• Composition: Wirewound (thermal and frequency characteristics)
• Package Configuration: Axial (physical form factor and PCB compatibility)
• Temperature Coefficient: ±20ppm/°C (stability specification)
• Physical Dimensions: 0.220" Dia x 0.406" L (board layout and spacing constraints)

The substitute part 42J680E meets all electrical and mechanical equivalence criteria. Differences in packaging format (bulk vs. standard), RoHS compliance status, and operating temperature range do not affect functional substitutability in applications where the core parameters are satisfied.

Parameter Comparison

Engineering Selection Recommendations

Both the 42J680 and 42J680E are active products manufactured by Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on the following criteria:

42J680 (Primary Part): Use when standard packaging format is required and RoHS non-compliant components are acceptable for the application.

42J680E (Substitute Part): Use when RoHS compliance is mandated by design or regulatory requirements, when bulk packaging aligns with procurement workflows, or when higher inventory availability (1141 units vs. 656 units) supports supply chain objectives. The 42J680E provides an explicit operating temperature range of -55°C ~ 275°C, which may be beneficial for applications requiring documented thermal performance boundaries.

Both parts are suitable for direct substitution in circuits where the 680 Ohm, 2W, ±5% tolerance specification is the controlling requirement.

Frequently Asked Questions (FAQ)

Q: Can the 42J680E be used as a direct replacement for the 42J680?

A: Yes. Both parts are electrically and mechanically equivalent. They share identical resistance value, tolerance, power rating, composition, package type, temperature coefficient, and physical dimensions. The 42J680E is a valid substitute for the 42J680 in all applications where these parameters satisfy the design requirement.

Q: What is the difference between the 42J680 and 42J680E?

A: The primary differences are packaging format (standard vs. bulk), RoHS compliance status (non-compliant vs. compliant), and documented operating temperature range. The 42J680E includes an explicit operating temperature specification of -55°C ~ 275°C. Electrical and mechanical performance are identical.

Q: Does the RoHS compliance difference affect substitutability?

A: RoHS compliance status does not affect the electrical or mechanical function of the component. Selection between RoHS-compliant and non-compliant versions depends on application requirements, regulatory mandates, and design specifications. If RoHS compliance is required, the 42J680E must be selected.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both the 42J680 and 42J680E have identical dimensions of 0.220" Dia x 0.406" L (5.60mm x 10.30mm). They are mechanically interchangeable in PCB layouts and mechanical assemblies.

Q: Which part should be selected for new designs?

A: For new designs, the 42J680E is recommended when RoHS compliance is a design requirement. Both parts are active products; selection should align with compliance mandates, packaging preferences, and supply chain availability.

Q: Is there a performance difference between wirewound axial resistors from different packaging formats?

A: No. The packaging format (standard vs. bulk) does not affect electrical performance. Both formats contain the same wirewound resistive element with identical electrical characteristics.