Equivalent & Substitute Parts for 3KP12C-B

Part Overview

The 3KP12C-B is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 12V reverse standoff voltage with a 20.9V maximum clamping voltage and 150.8A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

3KP12C-B

LittelfuseIn Stock: 10173KP12C-B Datasheet

Current PartRFQ

5KP12CA-B

Littelfuse Inc.In Stock: 9655KP12CA-B Datasheet

DirectRFQ

3KP12CA-TP

Micro Commercial CoIn Stock: 7493KP12CA-TP Datasheet

MFR RecommendedRFQ

5KP12CE3/TR13

Microchip TechnologyIn Stock: 12215KP12CE3/TR13 Datasheet

MFR RecommendedRFQ

BZW50-12B

STMicroelectronicsIn Stock: 1189BZW50-12B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP12C-B is determined by the following critical electrical and mechanical parameters:

Core Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 12V (all substitutes maintain this specification)
• Bidirectional Channels: 1 (single channel requirement)
• Type: Zener (TVS diode technology)
• Mounting Type: Through Hole (axial configuration)
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Acceptable Parameter Variations:

• Voltage - Clamping (Max) @ Ipp: Range 19.9V to 28V (within typical TVS tolerance bands)
• Current - Peak Pulse (10/1000µs): 150.8A to 2143A (higher ratings provide enhanced protection margin)
• Power - Peak Pulse: 3000W to 5000W (higher ratings acceptable for same application)
• Package / Case: P600 or R-6 axial packages (both through-hole axial configurations)

All identified substitutes maintain the 12V reverse standoff voltage, zener type classification, and through-hole mounting requirement. Variations in clamping voltage and peak pulse current reflect different product series within the TVS diode category, all suitable for general-purpose overvoltage protection.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, Same Series Family):

5KP12CA-B and 5KP12CE3/TR13 are both active products from established manufacturers (Littelfuse and Microchip Technology respectively) with ROHS3 compliance. Both maintain the 12V reverse standoff voltage and through-hole axial mounting configuration. The 5KP12CA-B offers identical peak pulse current (150.8A equivalent performance) with enhanced power rating (5kW vs 3kW). The 5KP12CE3/TR13 provides higher peak pulse current (227A) with 5kW power rating, suitable for applications requiring additional protection margin.

Secondary Substitute (Cross-Manufacturer Alternative):

3KP12CA-TP from Micro Commercial Co maintains electrical equivalence with the original 3KP12C-B, offering identical peak pulse current (150.8A) and power rating (3kW). Package configuration differs (R-6 vs P600), requiring mechanical verification for board layout compatibility.

Enhanced Protection Alternative:

BZW50-12B from STMicroelectronics provides significantly higher peak pulse current capability (2143A at 8/20µs pulse width) with 5kW power rating. This component is suitable for applications requiring enhanced transient suppression performance. Package configuration is R-6 axial, requiring mechanical compatibility assessment.

All substitutes maintain ROHS3 compliance and are currently in active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can 5KP12CA-B directly replace 3KP12C-B in existing designs?

A: Yes. Both components share the same 12V reverse standoff voltage, zener type, through-hole axial mounting, and operating temperature range. The 5KP12CA-B maintains identical peak pulse current (150.8A) with enhanced power rating (5kW vs 3kW), making it a direct functional substitute. No circuit modifications are required.

Q: What is the difference between P600 and R-6 package configurations?

A: Both P600 and R-6 are through-hole axial packages for TVS diodes. P600 and R-6 represent different physical dimensions and lead spacing. Component selection must verify PCB footprint compatibility with the existing design layout before substitution.

Q: Why does BZW50-12B have significantly higher peak pulse current (2143A)?

A: BZW50-12B belongs to the TRANSIL™ series, a different TVS diode product line optimized for higher transient current handling. The 2143A specification (measured at 8/20µs pulse width) reflects this enhanced capability. This component is suitable for applications requiring superior transient suppression performance compared to the 3KP series.

Q: Are all substitute parts ROHS3 compliant?

A: 5KP12CA-B, 5KP12CE3/TR13, and BZW50-12B are confirmed ROHS3 compliant. 3KP12CA-TP compliance status is not specified in available documentation. Verify compliance requirements with your procurement or quality assurance department before final component selection.

Q: What is the impact of different clamping voltages (19.9V to 28V) on circuit protection?

A: All substitute parts maintain the 12V reverse standoff voltage, which determines circuit activation threshold. Clamping voltage variations (19.9V to 28V) represent the maximum voltage the component allows during transient suppression. Lower clamping voltages provide tighter voltage regulation; higher clamping voltages offer broader application compatibility. Select based on specific circuit protection requirements.

Q: Can 3KP12CA-TP be used as a direct replacement despite different package type?

A: 3KP12CA-TP provides electrical equivalence (12V standoff, 150.8A peak pulse, 3kW power) but uses R-6 package instead of P600. Mechanical compatibility with existing PCB footprint must be verified. If board layout accommodates R-6 axial leads, this component is functionally suitable.