Equivalent & Substitute Parts for 3KP70C-B TVS Diode

Part Overview

The 3KP70C-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 70V reverse standoff voltage and 118.65V maximum clamping voltage with 26.5A peak pulse current capability in a through-hole P600 axial package.

The 3KP70C-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

3KP70C-B

Littelfuse Inc.In Stock: 11123KP70C-B Datasheet

Current PartRFQ

5KP70CA-B

Littelfuse Inc.In Stock: 6965KP70CA-B Datasheet

DirectRFQ

15KPA70CAE3/TR13

Microchip TechnologyIn Stock: 79115KPA70CAE3/TR13 Datasheet

MFR RecommendedRFQ

3KP70CA-TP

Micro Commercial CoIn Stock: 7173KP70CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP70C-B are qualified based on the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 70V to maintain identical transient protection threshold
• Mounting Type: Must be Through Hole to ensure PCB compatibility
• Type: Must be Zener diode for equivalent electrical behavior
• Bidirectional Channels: Must be 1 channel for single-line protection
• Operating Temperature Range: Must support -55°C to 175°C (TJ) for thermal compatibility
• Applications: General Purpose classification ensures functional equivalence

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (Same Package P600):

• 5KP70CA-B (Littelfuse Inc.)
• 15KPA70CAE3/TR13 (Microchip Technology)

Category 2 - Functional Equivalent (Alternative Package R-6):

• 3KP70CA-TP (Micro Commercial Co)

All substitute parts maintain the 70V reverse standoff voltage and general-purpose application profile. Differences in peak pulse current, clamping voltage, and power dissipation reflect different product series within the TVS diode family, each suitable for specific circuit protection requirements.

Parameter Comparison

Engineering Selection Recommendations

For P600 Package Compatibility (Direct Footprint Replacement):

The 5KP70CA-B (Littelfuse Inc., Active status) is the primary substitute for the 3KP70C-B. Both components share identical package geometry (P600, Axial) and mounting type (Through Hole). The 5KP70CA-B maintains the 70V reverse standoff voltage and -55°C to 175°C operating temperature range. The 5KP70CA-B offers higher peak pulse current (45.1A vs. 26.5A) and power dissipation (5000W vs. 3000W), providing enhanced transient protection capability within the same physical footprint. ROHS3 compliance is maintained.

The 15KPA70CAE3/TR13 (Microchip Technology, Active status) is a high-performance substitute suitable for applications requiring maximum transient energy absorption. This component maintains P600 package compatibility and 70V reverse standoff voltage. The 15KPA70CAE3/TR13 provides significantly higher peak pulse current (132.9A) and power dissipation (15000W), making it suitable for circuits exposed to severe transient events. ROHS3 and REACH compliance are maintained. Packaging is supplied in Tape & Reel format.

For Alternative Package Consideration (R-6 Package):

The 3KP70CA-TP (Micro Commercial Co, Active status) provides functional equivalence with identical peak pulse current (26.5A) and power dissipation (3000W) to the 3KP70C-B. This component uses an R-6 axial package instead of P600, requiring PCB layout modification. The 3KP70CA-TP maintains 70V reverse standoff voltage and -55°C to 175°C operating temperature range. This option is suitable only when PCB redesign is feasible.

All substitute parts are classified as Active products, ensuring ongoing availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the 5KP70CA-B directly replace the 3KP70C-B without PCB modification?

A: Yes. The 5KP70CA-B uses the identical P600 axial package and through-hole mounting configuration as the 3KP70C-B. No PCB layout changes are required. Both components share the same 70V reverse standoff voltage and operating temperature range (-55°C to 175°C TJ).

Q: What is the primary difference between the 5KP70CA-B and 15KPA70CAE3/TR13 substitutes?

A: Both maintain P600 package compatibility and 70V reverse standoff voltage. The 15KPA70CAE3/TR13 provides significantly higher transient energy handling: 132.9A peak pulse current and 15000W power dissipation compared to the 5KP70CA-B (45.1A and 5000W). Select the 15KPA70CAE3/TR13 for circuits exposed to high-energy transient events; select the 5KP70CA-B for standard protection requirements.

Q: Why is the 3KP70CA-TP listed as a substitute if it uses a different package (R-6)?

A: The 3KP70CA-TP provides functional equivalence in electrical performance (26.5A peak pulse current, 3000W power dissipation, 70V reverse standoff voltage) and is an active product. However, the R-6 package differs from the P600 package, requiring PCB footprint redesign. This option is suitable only when PCB modification is acceptable.

Q: Are all substitute parts RoHS compliant?

A: The 5KP70CA-B and 15KPA70CAE3/TR13 are explicitly ROHS3 compliant. The 3KP70CA-TP RoHS status is not specified in the provided data.

Q: What is the significance of the clamping voltage differences shown in the parameter comparison?

A: The clamping voltage (measured at peak pulse current Ipp) varies slightly among substitutes: 3KP70C-B (118.65V), 5KP70CA-B (113V), 15KPA70CAE3/TR13 (113.6V), and 3KP70CA-TP (113V). These variations reflect different product series designs. All values remain within acceptable transient suppression ranges for 70V standoff applications. The lower clamping voltages in the 5KP and 15KPA series indicate improved clamping performance.

Q: Can I use the 15KPA70CAE3/TR13 in a circuit originally designed for the 3KP70C-B?

A: Yes. The 15KPA70CAE3/TR13 maintains the 70V reverse standoff voltage, P600 package, and through-hole mounting required for direct substitution. The higher peak pulse current (132.9A) and power dissipation (15000W) provide enhanced protection without compromising circuit compatibility. This is a conservative upgrade suitable for any application using the 3KP70C-B.

Q: What packaging format is supplied for the 15KPA70CAE3/TR13?

A: The 15KPA70CAE3/TR13 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The 5KP70CA-B is supplied in Bulk packaging. Confirm packaging requirements with your procurement process.