Equivalent & Substitute Parts for 30KPA33C-B

Part Overview

The 30KPA33C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated at 33V reverse standoff with a 61.43V maximum clamping voltage and 517.9A peak pulse current. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for continued system design and procurement.

Substiute Parts

30KPA33C-B

Littelfuse Inc.In Stock: 77130KPA33C-B Datasheet

Current PartRFQ

30KPA33CA

MDE Semiconductor IncIn Stock: 232430KPA33CA Datasheet

DirectRFQ

30KPA33CA-B

Littelfuse Inc.In Stock: 94930KPA33CA-B Datasheet

DirectRFQ

15KP33CA-TP

Micro Commercial CoIn Stock: 148915KP33CA-TP Datasheet

MFR RecommendedRFQ

15KPA33CAE3/TR13

Microchip TechnologyIn Stock: 95915KPA33CAE3/TR13 Datasheet

MFR RecommendedRFQ

30KP33CA-TP

Micro Commercial CoIn Stock: 84830KP33CA-TP Datasheet

MFR RecommendedRFQ

5KP33CA-TP

Micro Commercial CoIn Stock: 168145KP33CA-TP Datasheet

MFR RecommendedRFQ

BZW50-33B

STMicroelectronicsIn Stock: 10466BZW50-33B Datasheet

MFR RecommendedRFQ

BZW50-33BRL

STMicroelectronicsIn Stock: 2152BZW50-33BRL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 30KPA33C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 33V
• Voltage - Clamping (Max) @ Ipp: Maximum allowable 61.43V
• Current - Peak Pulse (10/1000µs): Minimum 517.9A
• Power - Peak Pulse: 30000W (30kW)
• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial
• Operating Temperature: -55°C ~ 175°C (TJ)
• RoHS Status: ROHS3 Compliant

Substitute parts must maintain the 33V reverse standoff voltage rating and support the 30kW peak pulse power dissipation. Clamping voltage and peak pulse current variations are acceptable within the specified electrical performance envelope. Package variants (P600 and R-6) are mechanically compatible for through-hole mounting applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (30kW Power Rating):

30KPA33CA-B (Littelfuse Inc.) and 30KPA33CA (MDE Semiconductor Inc) are direct functional equivalents maintaining the 30kW peak pulse power rating, 33V reverse standoff voltage, and P600 axial package. Both parts are active products with ROHS3 compliance. The 30KPA33CA-B preserves the original manufacturer lineage from Littelfuse Inc.

30KP33CA-TP (Micro Commercial Co) provides equivalent 30kW power dissipation with identical voltage ratings but uses R-6 axial packaging. This part is active and ROHS3 compliant.

Secondary Substitutes (15kW Power Rating):

15KPA33CAE3/TR13 (Microchip Technology) and 15KP33CA-TP (Micro Commercial Co) reduce peak pulse power to 15kW while maintaining 33V reverse standoff voltage. These parts are suitable for applications where transient energy levels do not exceed 15kW. Both are active and ROHS3 compliant.

Lower Power Alternatives (5kW Power Rating):

5KP33CA-TP (Micro Commercial Co), BZW50-33B, and BZW50-33BRL (STMicroelectronics) are rated for 5kW peak pulse power. These parts maintain 33V reverse standoff voltage and are active products with ROHS3 compliance. Selection of lower power alternatives requires confirmation that application transient energy does not exceed 5kW.

All substitute parts maintain ROHS3 compliance and operating temperature range of -55°C to 175°C (TJ).

Frequently Asked Questions (FAQ)

Q: Can 30KPA33CA-B directly replace 30KPA33C-B?

A: Yes. Both parts maintain identical voltage ratings (33V reverse standoff), equivalent peak pulse current (517.9A), and 30kW power dissipation. The 30KPA33CA-B is active and ROHS3 compliant. The primary difference is product status: 30KPA33C-B is obsolete while 30KPA33CA-B is active.

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

A: Both are through-hole axial packages for TVS diodes. P600 and R-6 are mechanically compatible for PCB mounting. Package selection depends on PCB layout and component spacing requirements. Electrical performance is independent of package variant.

Q: Can I use a 15kW-rated part instead of the 30kW original?

A: Only if your application's transient energy does not exceed 15kW. The 30KPA33C-B is rated for 30kW peak pulse power. Using a lower-rated part in a 30kW application will result in component failure. Verify actual transient energy levels before selecting a lower power alternative.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original 30KPA33C-B specification.

Q: What is the significance of clamping voltage variation among substitutes?

A: Clamping voltage determines the maximum voltage spike the TVS diode allows across the protected circuit. The 30KPA33C-B clamps at 61.43V maximum. Substitutes with lower clamping voltages (58.5V, 54.8V, 53.3V) provide tighter voltage regulation. Substitutes with higher clamping voltages (76V for BZW50 series) allow greater voltage transients. Select based on circuit protection requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all selected parts meet the application's voltage rating (33V reverse standoff), power dissipation requirement, and operating temperature range. Mixing parts from different manufacturers is acceptable if electrical specifications align with circuit protection needs.