3KP48CA-B Equivalent & Substitute Parts

Part Overview

The 3KP48CA-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This bidirectional Zener diode features a 48V reverse standoff voltage with a 77.4V maximum clamping voltage and 38.8A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar protection characteristics.

Substiute Parts

3KP48CA-B

Littelfuse Inc.In Stock: 12003KP48CA-B Datasheet

Current PartRFQ

5KP48CA-B

Littelfuse Inc.In Stock: 42585KP48CA-B Datasheet

DirectRFQ

30KP48CA-TP

Micro Commercial CoIn Stock: 81630KP48CA-TP Datasheet

MFR RecommendedRFQ

3KP48CA-TP

Micro Commercial CoIn Stock: 8513KP48CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP48CA-B is determined by the following critical parameters that must remain consistent or compatible:

Core Electrical Parameters:

• Voltage - Reverse Standoff: 48V (nominal)
• Voltage - Breakdown (Min): 53.3V or equivalent
• Voltage - Clamping (Max) @ Ipp: 77.4V or lower (protective margin)
• Type: Zener, Bidirectional

Mechanical & Environmental Parameters:

• Mounting Type: Through Hole
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• RoHS Compliance: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Package Compatibility:

• Axial through-hole packages (P600 or R-6) are mechanically compatible in standard PCB layouts

Substitute parts are grouped based on whether they maintain the same voltage protection characteristics while potentially offering different power ratings, peak pulse currents, or package variants. Parts with identical electrical specifications but different packaging or from alternative manufacturers are direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

5KP48CA-B (Littelfuse Inc.) — Active Status Substitute This part maintains identical voltage specifications (48V standoff, 77.4V clamping) and peak pulse current (38.8A) as the 3KP48CA-B. The primary difference is increased power dissipation capability (5kW vs. 3kW) and higher peak pulse current (65.9A), providing enhanced transient protection margin. Both parts use P600 axial packaging and are ROHS3 compliant. This is the direct functional equivalent with improved performance characteristics and active product status.

3KP48CA-TP (Micro Commercial Co) — Electrical Equivalent, Package Variant This part provides identical electrical specifications to the main part (48V standoff, 77.4V clamping, 38.8A peak pulse, 3kW power) with equivalent protection performance. The package variant changes from P600 to R-6 axial, both through-hole compatible. Product status is active. This substitute is suitable for applications where R-6 package footprint is acceptable.

30KP48CA-TP (Micro Commercial Co) — Enhanced Protection Variant This part maintains the same 48V voltage class but features significantly higher power dissipation (30kW vs. 3kW) and slightly higher clamping voltage (81.6V vs. 77.4V). The R-6 axial package is through-hole compatible. This substitute is appropriate for high-energy transient environments requiring greater surge capacity while maintaining the same voltage protection threshold.

All substitute parts are ROHS3 compliant and operate within the same temperature range (-55°C ~ 175°C). Selection should be based on available inventory, required power dissipation, and package footprint compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can 5KP48CA-B directly replace 3KP48CA-B in existing designs? A: Yes. The 5KP48CA-B maintains identical voltage specifications (48V standoff, 77.4V clamping) and uses the same P600 axial through-hole package. The increased power rating (5kW vs. 3kW) provides additional transient protection margin without affecting circuit compatibility.

Q: What is the difference between P600 and R-6 packages? A: Both are through-hole axial packages suitable for PCB mounting. P600 and R-6 are different physical form factors from different manufacturers. Mechanical compatibility depends on PCB pad spacing and lead diameter specifications. Verify footprint compatibility before substitution.

Q: Why does 30KP48CA-TP have a higher clamping voltage (81.6V vs. 77.4V)? A: The 30KP48CA-TP is designed for higher power dissipation (30kW) applications. The slightly higher clamping voltage is a characteristic of its enhanced design. It remains within the 48V voltage class and provides equivalent protection for the same voltage threshold.

Q: Are all substitute parts ROHS3 compliant? A: 5KP48CA-B and 30KP48CA-TP are confirmed ROHS3 compliant. 3KP48CA-TP RoHS status is not specified in available data. Verify compliance documentation with the supplier before use in regulated applications.

Q: Can I use a higher power-rated TVS diode as a substitute? A: Yes, provided voltage specifications remain compatible. Higher power ratings (5kW or 30kW) offer improved transient suppression capability without affecting the circuit's voltage protection threshold. Verify package footprint compatibility with existing PCB designs.

Q: What is the significance of the 10/1000µs pulse specification? A: This defines the peak pulse current rating under a specific transient waveform (10µs rise time, 1000µs pulse width). It indicates the maximum current the TVS diode can safely conduct during a transient event. Higher ratings provide greater protection margin for high-energy transients.