5KP12A Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP12A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This through-hole component operates across a temperature range of -55°C to 175°C and is ROHS3 compliant. The part is currently active in production with 4400 units in stock. Equivalent and substitute parts may be required due to inventory constraints, lead time considerations, or specific application requirements within the allowed electrical and mechanical parameter ranges.

Substiute Parts

5KP12A

Littelfuse Inc.In Stock: 45015KP12A Datasheet

Current PartRFQ

1.5KE15A

Taiwan Semiconductor CorporationIn Stock: 150811.5KE15A Datasheet

MFR RecommendedRFQ

1.5KE16A

Taiwan Semiconductor CorporationIn Stock: 3001841.5KE16A Datasheet

MFR RecommendedRFQ

BZW50-12B

STMicroelectronicsIn Stock: 1189BZW50-12B Datasheet

DirectRFQ

1.5KE15A

Taiwan Semiconductor CorporationIn Stock: 150811.5KE15A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5KP12A is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 12V nominal
• Voltage - Breakdown (Min): 13.3V minimum
• Voltage - Clamping (Max) @ Ipp: 19.9V maximum
• Current - Peak Pulse (10/1000µs): 256.3A
• Power - Peak Pulse: 5000W
• Type: Zener diode, unidirectional configuration

Mechanical & Environmental Criteria:

• Mounting Type: Through Hole
• Operating Temperature: -55°C ~ 175°C
• RoHS Status: ROHS3 Compliant
• Compliance: REACH Unaffected, ECCN EAR99

Substitute parts are grouped into two categories:

Category 1 - Manufacturer Recommended (MFR Recommended): 1.5KE15A and 1.5KE16A from Taiwan Semiconductor Corporation. These parts operate within the specified voltage standoff and breakdown ranges with reduced peak pulse current (74A and 70A respectively) and lower peak pulse power (1500W). These are suitable for applications where the full 5000W peak pulse power is not required.

Category 2 - Direct Manufacturer Equivalent: BZW50-12B from STMicroelectronics. This part maintains identical voltage standoff (12V) and peak pulse power (5000W) specifications but operates as a bidirectional TVS diode with significantly higher peak pulse current capability (2143A at 8/20µs pulse).

Parameter Comparison

Engineering Selection Recommendations

For 1.5KE15A and 1.5KE16A Selection: These parts are suitable when peak pulse power requirements do not exceed 1500W. Both maintain ROHS3 compliance and active product status. The 1.5KE15A operates at a lower voltage standoff (12.8V) compared to 1.5KE16A (13.6V), allowing selection based on specific circuit voltage thresholds. Both are available in high inventory quantities (15029 units for 1.5KE15A, 300100 units for 1.5KE16A).

For BZW50-12B Selection: This part maintains identical voltage standoff (12V) and peak pulse power (5000W) as the 5KP12A, making it suitable for applications requiring full power dissipation capability. The bidirectional configuration provides protection in both polarities. ROHS3 compliance and active product status are confirmed. Package differences (R-6 versus P600) require PCB layout verification. Inventory availability is lower (1103 units).

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and active product status, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can 1.5KE15A or 1.5KE16A be used as direct replacements for 5KP12A? A: These parts are suitable substitutes only when the application does not require the full 5000W peak pulse power capability. The 1.5KE series is rated for 1500W peak pulse power. Voltage standoff and breakdown parameters are within acceptable ranges for general-purpose transient protection. Physical package differences (DO-201 versus P600) require PCB layout verification.

Q: What is the difference between unidirectional and bidirectional TVS diodes? A: The 5KP12A and 1.5KE series are unidirectional, providing protection in one polarity direction only. The BZW50-12B is bidirectional, protecting against transients in both polarities. Selection depends on circuit polarity requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. The 5KP12A, 1.5KE15A, 1.5KE16A, and BZW50-12B are all ROHS3 compliant with REACH unaffected status.

Q: How do package differences affect substitution? A: The 5KP12A uses P600 axial package, while 1.5KE series uses DO-201AA/DO-27 axial package, and BZW50-12B uses R-6 axial package. All are through-hole axial configurations, but PCB footprint and lead spacing differ. Physical layout verification is required before substitution.

Q: What is the significance of voltage clamping values? A: Voltage clamping (Max) @ Ipp indicates the maximum voltage the TVS diode will clamp to during peak pulse current. Lower clamping voltage provides better circuit protection. The 5KP12A clamps at 19.9V, while 1.5KE15A clamps at 21.2V and 1.5KE16A at 22.5V. BZW50-12B clamps at 28V.

Q: Can BZW50-12B be used in place of 5KP12A despite bidirectional operation? A: Yes, if the circuit topology permits bidirectional protection. The BZW50-12B maintains identical voltage standoff (12V) and peak pulse power (5000W). The bidirectional characteristic provides additional protection against reverse polarity transients. Package and lead spacing differences require PCB verification.