43F56RE Equivalent & Substitute Parts

Part Overview

The 43F56RE is a 56 Ohms ±1% 3W through-hole resistor manufactured by Ohmite in the Ohmicone® 40 series. This axial wirewound resistor is designed for applications requiring precision resistance with high power dissipation capability. The part is currently active in production with 749 units in stock. Equivalent and substitute parts are identified when identical electrical specifications and compatible mechanical packaging are available from alternative manufacturers, enabling supply chain flexibility and design optimization.

Substiute Parts

43F56RE

OhmiteIn Stock: 77743F56RE Datasheet

Current PartRFQ

UB3C-56RF1

RiedonIn Stock: 1595UB3C-56RF1 Datasheet

SimilarRFQ

WW3FT56R0

Stackpole Electronics IncIn Stock: 1195WW3FT56R0 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43F56RE are qualified based on the following critical parameters:

• Resistance value: 56 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Operating temperature range: Minimum -55°C, maximum ≥250°C
• Termination count: 2 (exact match required)
• RoHS compliance: Required

The substitute parts UB3C-56RF1 (Riedon) and WW3FT56R0 (Stackpole Electronics Inc) meet all critical electrical and mechanical parameters. Physical dimensions may vary within acceptable tolerances for axial through-hole mounting applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—43F56RE, UB3C-56RF1, and WW3FT56R0—are active products with current manufacturing status and full RoHS compliance. Selection between these parts should be based on:

• Supply availability: UB3C-56RF1 has 1549 units in stock; WW3FT56R0 has 1138 units; 43F56RE has 749 units.
• Operating temperature requirements: WW3FT56R0 supports the highest maximum temperature (350°C), while UB3C-56RF1 is rated to 250°C. The 43F56RE operates to 275°C.
• Physical space constraints: WW3FT56R0 and UB3C-56RF1 have smaller diameters than 43F56RE, which may be advantageous in compact layouts.
• Additional features: UB3C-56RF1 includes current sense, flame proof, and pulse withstanding capabilities; WW3FT56R0 includes moisture resistant construction.

Frequently Asked Questions (FAQ)

Q: Can UB3C-56RF1 replace 43F56RE in all applications? A: UB3C-56RF1 is electrically equivalent with identical resistance, tolerance, power rating, and temperature coefficient. The maximum operating temperature is 250°C versus 275°C for 43F56RE. Verify application temperature requirements before substitution.

Q: What are the physical dimension differences between these parts? A: The three parts have different axial lengths and diameters. 43F56RE measures 0.220" Dia x 0.594" L; UB3C-56RF1 measures 0.157" Dia x 0.350" L; WW3FT56R0 measures 0.187" Dia x 0.560" L. Confirm PCB layout compatibility before substitution.

Q: Are all three parts RoHS compliant? A: Yes. 43F56RE is RoHS Compliant; UB3C-56RF1 and WW3FT56R0 are ROHS3 Compliant. All meet regulatory requirements.

Q: Which substitute part has the best high-temperature performance? A: WW3FT56R0 supports the highest operating temperature at 350°C maximum, compared to 275°C for 43F56RE and 250°C for UB3C-56RF1.

Q: Does moisture sensitivity affect part selection? A: 43F56RE and UB3C-56RF1 have MSL 1 (Unlimited). WW3FT56R0 has MSL Not Applicable. For moisture-sensitive storage environments, 43F56RE and UB3C-56RF1 offer unlimited shelf life without special handling.