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Equivalent & Substitute Parts for 30KPA75-B TVS Diode
Part Overview
The 30KPA75-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications. This unidirectional Zener diode operates with a 75V reverse standoff voltage and delivers 253.8A peak pulse current with 30kW peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active substitute components that maintain equivalent electrical and mechanical performance for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 75V |
| Voltage Breakdown (Min) | 79.19V |
| Voltage Clamping (Max) @ Ipp | 125.37V |
| Peak Pulse Current (10/1000µs) | 253.8A |
| Peak Pulse Power | 30000W (30kW) |
| Operating Temperature Range | -55°C to 175°C (TJ) |
| Package Type | P600, Axial (Through Hole) |
| Diode Type | Zener, Unidirectional |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 30KPA75-B is determined by the following critical parameters:
- Reverse Standoff Voltage: Must be 75V (±tolerance as specified by manufacturer)
- Peak Pulse Current Capability: Minimum 253.8A at 10/1000µs pulse width
- Peak Pulse Power Dissipation: Minimum 30kW rating
- Package/Case Type: P600 axial through-hole configuration
- Operating Temperature Range: -55°C to 175°C (TJ)
- Diode Type: Zener, unidirectional configuration
- Compliance: ROHS3 compliant
Substitute parts are grouped into two categories based on these parameters:
Category A - Direct Electrical & Mechanical Equivalents (P600 Package, ≥30kW): Parts maintaining identical package geometry, peak pulse power rating, and peak pulse current capability.
Category B - Functional Alternatives (Different Package, Reduced Power Rating): Parts with matching voltage specifications and operating temperature but different package types or reduced power dissipation ratings, suitable only where mechanical constraints permit substitution.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Package | Status |
|---|---|---|---|---|---|---|---|---|
| 30KPA75-B | Littelfuse Inc. | 75 | 79.19 | 125.37 | 253.8 | 30000 | P600 | Obsolete |
| 30KPA75A-B | Littelfuse Inc. | 75 | 83.8 | 119.4 | 253.8 | 30000 | P600 | Active |
| 30KPA75A | MDE Semiconductor Inc | 75 | 83.8 | 119.4 | 253.8 | 30000 | P600 | Active |
| 5KP75A-E3/54 | Vishay General Semiconductor | 75 | 83.3 | 121 | 41.3 | 5000 | P600 | Active |
| 5KP75A-E3/73 | Vishay General Semiconductor | 75 | 83.3 | 121 | 41.3 | 5000 | P600 | Active |
| 5KP75A-TP | Micro Commercial Co | 75 | 83.3 | 121 | — | 5000 | R-6 | Active |
| 5KP75AHE3/54 | Vishay General Semiconductor | 75 | 83.3 | 121 | 41.3 | 5000 | P600 | Active |
| 5KP75AHE3/73 | Vishay General Semiconductor | 75 | 83.3 | 121 | 41.3 | 5000 | P600 | Active |
| 15KP75A-TP | Micro Commercial Co | 75 | 83.3 | 122 | — | 15000 | R-6 | Active |
| 3KP75A-TP | Micro Commercial Co | 75 | 83.3 | 121 | 24.8 | 3000 | R-6 | Active |
| SA75A | Taiwan Semiconductor Corporation | 75 | 83.3 | 121 | 4.3 | 500 | DO-204AC | Active |
Engineering Selection Recommendations
Primary Substitutes (Direct Equivalents):
30KPA75A-B (Littelfuse Inc.) and 30KPA75A (MDE Semiconductor Inc.) are the preferred direct substitutes. Both maintain the P600 axial package, 30kW peak pulse power rating, and 253.8A peak pulse current specification. Both are active products with ROHS3 compliance. The 30KPA75A-B is manufactured by the original equipment supplier, ensuring design continuity.
Secondary Substitutes (Reduced Power Rating, Same Package):
5KP75A-E3/54, 5KP75A-E3/73, 5KP75AHE3/54, and 5KP75AHE3/73 maintain the P600 package and ROHS3 compliance but provide 5kW peak pulse power and 41.3A peak pulse current. These are suitable only for applications where the 30kW power dissipation requirement can be reduced. The automotive-qualified variants (5KP75AHE3/54 and 5KP75AHE3/73) carry AEC-Q101 certification.
Tertiary Substitutes (Alternative Packages, Reduced Power Rating):
15KP75A-TP, 5KP75A-TP, and 3KP75A-TP employ the R-6 axial package instead of P600. These parts provide 15kW, 5kW, and 3kW peak pulse power respectively and are suitable only where mechanical board layout permits package substitution. SA75A uses the DO-204AC package with 500W power rating and is applicable only to low-power applications.
Compliance Considerations:
All substitute parts listed maintain ROHS3 compliance. The 5KP75AHE3/54 and 5KP75AHE3/73 variants include AEC-Q101 automotive qualification, applicable to automotive-grade designs.
Frequently Asked Questions (FAQ)
Q: Can 30KPA75A-B directly replace 30KPA75-B in existing designs?
A: Yes. The 30KPA75A-B maintains identical reverse standoff voltage (75V), peak pulse current (253.8A), peak pulse power (30kW), package type (P600), and operating temperature range (-55°C to 175°C). The primary difference is the clamping voltage, which is 119.4V versus 125.37V. This represents a tighter clamping specification and is functionally compatible.
Q: What is the difference between P600 and R-6 packages?
A: P600 and R-6 are both axial through-hole packages but differ in physical dimensions and lead spacing. P600 is the original package for the 30KPA75-B. R-6 packages are physically smaller. Substitution between these packages requires verification of PCB layout compatibility and mechanical clearance.
Q: Can I use a 5kW-rated part instead of the 30kW-rated 30KPA75-B?
A: Only if your application's actual transient energy dissipation does not exceed 5kW. The 30kW rating indicates the part's capability to handle high-energy transient events. Using a lower-rated part in a 30kW application will result in component failure. Verify your circuit's actual peak pulse power requirement before substitution.
Q: Are the Vishay 5KP75A variants interchangeable with Micro Commercial 5KP75A-TP?
A: Both maintain 75V reverse standoff voltage and 5kW peak pulse power. However, Vishay parts use the P600 package while Micro Commercial uses the R-6 package. They are electrically equivalent but mechanically different. Package compatibility with your PCB design determines interchangeability.
Q: What does AEC-Q101 qualification mean for the 5KP75AHE3 variants?
A: AEC-Q101 is an automotive industry qualification standard. Parts bearing this certification have undergone additional reliability testing and are approved for automotive applications. Use these variants only if your design requires automotive-grade components.
Q: Why is the clamping voltage different between 30KPA75-B and its substitutes?
A: Clamping voltage variation within the 75V reverse standoff class reflects manufacturing tolerances and design differences between manufacturers. The 30KPA75-B specifies 125.37V maximum clamping, while substitutes range from 119.4V to 122V. All values remain within acceptable operating margins for general-purpose TVS applications. Verify your circuit's maximum allowable clamping voltage before substitution.
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