Ohmite 45F2K2 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F2K2 is a 2.2 kOhms ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and maintains 894 units in new original stock. The part operates with a temperature coefficient of ±20ppm/°C and is housed in an axial package measuring 0.343" diameter by 0.937" length (8.70mm x 23.80mm). Equivalent substitute parts are identified when they maintain identical electrical specifications—resistance value, tolerance, power rating, and composition—while meeting the same mechanical and environmental requirements for direct circuit board replacement.

Substiute Parts

45F2K2

OhmiteIn Stock: 95545F2K2 Datasheet

Current PartRFQ

ALSR052K200FE12

Vishay DaleIn Stock: 1321ALSR052K200FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 45F2K2 are qualified based on the following critical parameters that determine functional equivalence:

• Resistance Value: Must be 2.2 kOhms
• Tolerance: Must be ±1%
• Power Rating: Must be 5W
• Composition: Must be Wirewound
• Package Configuration: Must be Axial with 2 terminations
• Mechanical Compatibility: Physical dimensions must accommodate standard axial component footprints

The Vishay Dale ALSR052K200FE12 meets all substitution criteria. Both parts share identical electrical specifications and axial package configuration, enabling direct replacement in circuits designed for the Ohmite 45F2K2.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 45F2K2 and Vishay Dale ALSR052K200FE12 are active production components with identical core electrical specifications. The Vishay Dale ALSR052K200FE12 offers ROHS3 compliance, whereas the Ohmite 45F2K2 is RoHS non-compliant. For applications requiring RoHS compliance, the Vishay Dale substitute is the appropriate selection. The Vishay Dale part also provides a defined operating temperature range of -65°C to 250°C and moisture-resistant construction, offering enhanced environmental performance. The temperature coefficient difference (±30ppm/°C versus ±20ppm/°C) remains within acceptable tolerance for most general-purpose circuit applications. Physical dimensions are comparable, with the Vishay Dale part slightly smaller, ensuring compatibility with standard axial component layouts.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR052K200FE12 directly replace the Ohmite 45F2K2 in existing designs?

A: Yes. Both parts share identical resistance value (2.2 kOhms), tolerance (±1%), power rating (5W), composition (wirewound), and axial package configuration. The Vishay Dale part is slightly smaller in physical dimensions but remains compatible with standard axial component footprints.

Q: What is the significance of the temperature coefficient difference?

A: The Ohmite 45F2K2 has a temperature coefficient of ±20ppm/°C, while the Vishay Dale ALSR052K200FE12 has ±30ppm/°C. This difference indicates the Ohmite part exhibits slightly better resistance stability across temperature variations. For general-purpose applications, both coefficients are acceptable. For precision circuits requiring minimal temperature drift, the Ohmite part is preferred.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical performance. Both parts deliver identical electrical specifications. The Vishay Dale ALSR052K200FE12 is ROHS3 compliant, making it suitable for applications subject to RoHS requirements.

Q: Are the physical dimensions interchangeable?

A: The Ohmite 45F2K2 measures 0.343" diameter by 0.937" length, while the Vishay Dale ALSR052K200FE12 measures 0.312" diameter by 0.875" length. The Vishay Dale part is slightly smaller. Both fit standard axial component spacing on circuit boards. Verify board layout clearances if space is constrained.

Q: What does moisture-resistant construction mean for the Vishay Dale part?

A: Moisture-resistant construction reduces susceptibility to humidity and environmental moisture exposure. This feature enhances reliability in humid or corrosive environments. The Ohmite part does not specify moisture-resistant features.