3KP90C-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 3KP90C-B is a bidirectional Zener TVS diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage suppression applications. Featuring a 90V reverse standoff voltage and 153.3V maximum clamping voltage with 20.5A peak pulse current capability, this component provides 3000W peak pulse power dissipation in a through-hole P600 axial package.

The 3KP90C-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. Substitute parts must maintain compatibility across critical electrical parameters including reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation ratings, while accommodating package variations where applicable.

Key Parameters

Parameter	3KP90C-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	90V
Voltage - Breakdown (Min)	94.95V
Voltage - Clamping (Max) @ Ipp	153.3V
Current - Peak Pulse (10/1000µs)	20.5A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 3KP90C-B are selected based on the following critical parameters that determine functional equivalence:

Primary Selection Criteria:

Reverse standoff voltage within the 90V specification
Clamping voltage range compatible with 153.3V maximum
Peak pulse current capability of 20.5A or greater
Power dissipation rating of 3000W or greater
Bidirectional Zener type configuration
Through-hole axial mounting

Grouping Logic:

Group 1 - Direct Littelfuse Series Upgrade (5KP90CA-B): Higher power rating (5000W) with same reverse standoff voltage (90V) and compatible clamping voltage (146V). Maintains P600 package compatibility. Active product status ensures ongoing availability.

Group 2 - Alternative Manufacturers with Reduced Power Ratings (1.5KE100CA, 1.5KE110CA, 1.5KE91CA): These parts operate at 1500W peak pulse power with comparable reverse standoff voltages (85.5V to 94V) and clamping voltages (125V to 152V). Peak pulse current ranges from 10.3A to 12.6A. Package transition to DO-201 (DO-27) axial format. Suitable for applications where 3000W dissipation is not required.

Group 3 - Compact Package Alternatives (P4KE100CA, P6KE100CA, P6KE110CA, P6KE91CA, SA78CA, SA90CA): These parts provide 400W to 600W peak pulse power in DO-204AL (DO-41) or DO-204AC (DO-15) packages. Peak pulse currents range from 3A to 5A. Applicable for lower-power transient suppression requirements with space constraints.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Current (A)	Power - Peak Pulse	Package	Product Status
3KP90C-B	Littelfuse Inc.	90	94.95	153.3	20.5	3000W	P600, Axial	Obsolete
5KP90CA-B	Littelfuse Inc.	90	100	146	34.9	5000W	P600, Axial	Active
1.5KE100CA	Diotec Semiconductor	85.5	95	137	11.4	1500W	DO-201, Axial	Active
1.5KE110CA	Taiwan Semiconductor Corporation	94	105	152	10.3	1500W	DO-201, Axial	Active
1.5KE91CA	Taiwan Semiconductor Corporation	77.8	86.5	125	12.6	1500W	DO-201, Axial	Active
P4KE100CA	Taiwan Semiconductor Corporation	85.5	95	137	3	400W	DO-204AL, Axial	Active
P6KE100CA	Fairchild Semiconductor	85.5	95	137	4.5	600W	DO-204AC, Axial	Active
P6KE110CA	Taiwan Semiconductor Corporation	94	105	152	4	600W	DO-204AC, Axial	Active
P6KE91CA	Fairchild Semiconductor	77.8	86.5	125	5	600W	DO-204AC, Axial	Active
SA78CA	Taiwan Semiconductor Corporation	78	86.7	126	4.1	500W	DO-204AC, Axial	Active
SA90CA	Taiwan Semiconductor Corporation	90	100	146	4.6	500W	DO-204AC, Axial	Active

Engineering Selection Recommendations

Primary Recommendation - 5KP90CA-B (Littelfuse Inc.): The 5KP90CA-B is the preferred direct substitute. It maintains identical reverse standoff voltage (90V), compatible clamping voltage (146V vs. 153.3V), and P600 axial package format. The higher peak pulse current (34.9A) and power rating (5000W) provide enhanced capability margins. Active product status ensures long-term supply availability and technical support continuity. ROHS3 compliance and unlimited moisture sensitivity rating match the original specification.

Secondary Recommendation - 1.5KE110CA (Taiwan Semiconductor Corporation): For applications where 3000W peak pulse dissipation is not required, the 1.5KE110CA provides equivalent reverse standoff voltage (94V) and clamping voltage (152V) performance. Active product status and ROHS3 compliance are confirmed. Package transition to DO-201 (DO-27) requires PCB layout modification. Peak pulse current of 10.3A and 1500W power rating are suitable for moderate transient suppression requirements.

Tertiary Recommendation - SA90CA (Taiwan Semiconductor Corporation): The SA90CA matches the original 90V reverse standoff voltage and 146V clamping voltage with active product status and ROHS3 compliance. The DO-204AC (DO-15) package provides compact form factor for space-constrained applications. Peak pulse current of 4.6A and 500W power rating are applicable only for low-energy transient suppression scenarios.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and are classified as active products with confirmed inventory availability. Operating temperature ranges (-55°C to 175°C) are consistent across primary and secondary recommendations.

Frequently Asked Questions (FAQ)

Q: Can the 5KP90CA-B directly replace the 3KP90C-B without circuit modification?

A: Yes. The 5KP90CA-B maintains identical reverse standoff voltage (90V), compatible clamping voltage (146V), and P600 axial package format. No circuit modifications are required. The higher power rating (5000W vs. 3000W) and peak pulse current (34.9A vs. 20.5A) provide enhanced performance margins.

Q: What is the primary difference between the 3KP90C-B and 1.5KE110CA?

A: The primary differences are power dissipation rating (3000W vs. 1500W), peak pulse current capability (20.5A vs. 10.3A), and package format (P600 vs. DO-201). The 1.5KE110CA is suitable for applications requiring lower transient energy suppression. Reverse standoff voltage (90V vs. 94V) and clamping voltage (153.3V vs. 152V) are functionally equivalent.

Q: Are package transitions from P600 to DO-201 or DO-204AC compatible with existing PCB layouts?

A: No. Package transitions require PCB layout modifications. P600 (axial, 0.3" lead spacing) differs from DO-201 (axial, 0.4" lead spacing) and DO-204AC (axial, 0.2" lead spacing). Lead diameter and spacing variations necessitate new PCB artwork and assembly process adjustments.

Q: Which substitute part is recommended for high-energy transient suppression applications?

A: The 5KP90CA-B is recommended for high-energy applications. It provides 5000W peak pulse power dissipation and 34.9A peak pulse current, exceeding the original 3KP90C-B specifications. Active product status and Littelfuse manufacturing ensure consistent performance and long-term availability.

Q: Do all substitute parts maintain the same operating temperature range?

A: The 5KP90CA-B and 1.5KE110CA maintain the original -55°C to 175°C operating temperature range. The P6KE100CA and P6KE91CA operate at -50°C to 175°C, providing a 5°C reduction at the lower temperature limit. Verify application requirements before selection.

Q: What is the significance of reverse standoff voltage matching?

A: Reverse standoff voltage determines the maximum voltage the TVS diode withstands without conducting. The 3KP90C-B specifies 90V. Substitutes with 90V (5KP90CA-B, SA90CA) or closely matched values (85.5V to 94V) maintain circuit protection characteristics. Significant deviations compromise transient suppression effectiveness.

Q: Are all substitute parts ROHS3 compliant?

A: The 5KP90CA-B, 1.5KE110CA, 1.5KE91CA, P4KE100CA, P6KE110CA, P6KE91CA, SA78CA, and SA90CA are confirmed ROHS3 compliant. The 1.5KE100CA (Diotec Semiconductor) lists RoHS status as "Not applicable." Verify compliance requirements for your specific application before final selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message