Equivalent & Substitute Parts for 3KP90CA-B TVS Diode

Part Overview

The 3KP90CA-B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 90V reverse standoff voltage, 146V maximum clamping voltage, and 20.5A peak pulse current capability in a through-hole P600 axial package. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure long-term component availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	90	V
Voltage - Breakdown (Min)	100	V
Voltage - Clamping (Max) @ Ipp	146	V
Current - Peak Pulse (10/1000µs)	20.5	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 3KP90CA-B is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 90V nominal
Voltage - Clamping (Max) @ Ipp: 146V maximum
Bidirectional operation (1 channel)
Through-hole axial mounting configuration
Zener diode type
General-purpose application classification

Secondary Considerations:

Current - Peak Pulse rating (minimum 20.5A for direct replacement)
Power - Peak Pulse dissipation capability
Operating temperature range compatibility (-55°C to 175°C)
RoHS3 compliance and regulatory status

Substitute parts are grouped into two categories: direct electrical equivalents with identical voltage and current ratings, and functional alternatives with comparable voltage performance but different current handling or package configurations.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	Power (W)	Package	Status
3KP90CA-B	Littelfuse Inc.	90	100	146	20.5	3000	P600	Obsolete
5KP90CA-B	Littelfuse Inc.	90	100	146	34.9	5000	P600	Active
3KP90CA-TP	Micro Commercial Co	90	100	146	20.5	3000	R-6	Active
1.5KE100CA	Diotec Semiconductor	85.5	95	137	11.4	1500	DO-201	Active
1.5KE110CA	Taiwan Semiconductor Corporation	94	105	152	10.3	1500	DO-201	Active
P6KE91CA	Fairchild Semiconductor	77.8	86.5	125	5	600	DO-15	Active
P6KE100CA	Fairchild Semiconductor	85.5	95	137	4.5	600	DO-15	Active
P6KE110CA	Taiwan Semiconductor Corporation	94	105	152	4	600	DO-15	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

The 5KP90CA-B from Littelfuse Inc. provides identical voltage specifications (90V standoff, 146V clamping) with enhanced current handling (34.9A vs. 20.5A) and increased power dissipation (5kW vs. 3kW). This part maintains the same P600 axial package and is currently in active production status with ROHS3 compliance. The 5KP90CA-B is suitable for applications where the original 3KP90CA-B specifications are met or exceeded.

The 3KP90CA-TP from Micro Commercial Co matches the electrical specifications exactly (90V standoff, 146V clamping, 20.5A peak pulse, 3kW power) but uses an R-6 axial package instead of P600. This part is active and REACH compliant, making it a viable alternative where package footprint differences are acceptable.

Functional Alternatives (Voltage-Compatible, Reduced Current Rating):

The 1.5KE100CA (Diotec Semiconductor) and 1.5KE110CA (Taiwan Semiconductor Corporation) offer comparable voltage protection in the 85.5V to 94V standoff range with clamping voltages of 137V to 152V. These parts feature reduced peak pulse current (10.3A to 11.4A) and lower power dissipation (1.5kW), suitable for applications with lower transient energy requirements. Both use DO-201 axial packages and are active products.

The P6KE series (P6KE91CA, P6KE100CA, P6KE110CA) from Fairchild Semiconductor and Taiwan Semiconductor Corporation provide voltage protection in the 77.8V to 94V standoff range with clamping voltages of 125V to 152V. These parts feature significantly reduced peak pulse current (4A to 5A) and power dissipation (600W), packaged in DO-15 format. Selection within this series depends on specific voltage requirements and application constraints.

Compliance and Availability:

All recommended active substitutes maintain ROHS3 compliance and are currently in production. The 5KP90CA-B and 3KP90CA-TP are preferred for direct replacement scenarios due to identical electrical performance. Lower-power alternatives should be selected only when application requirements permit reduced current and power handling.

Frequently Asked Questions (FAQ)

Q: Can the 5KP90CA-B directly replace the 3KP90CA-B?

A: Yes. The 5KP90CA-B maintains identical voltage specifications (90V standoff, 146V clamping) and uses the same P600 axial package. The higher current rating (34.9A vs. 20.5A) and power dissipation (5kW vs. 3kW) provide enhanced protection margin without affecting circuit compatibility.

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 differ in physical dimensions and lead spacing. Component selection must verify PCB footprint compatibility before substitution.

Q: Can I use the 1.5KE100CA as a substitute?

A: The 1.5KE100CA provides comparable voltage protection (85.5V standoff, 137V clamping) but with significantly reduced current handling (11.4A vs. 20.5A) and power dissipation (1.5kW vs. 3kW). This substitution is valid only for applications where transient energy levels are lower than the original design specification.

Q: Why are DO-15 package parts listed as alternatives?

A: The P6KE series in DO-15 packages offers voltage-compatible protection but with substantially reduced current and power ratings (4A to 5A, 600W). These parts are suitable only for low-energy transient suppression applications and require PCB redesign due to different package geometry.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed maintain ROHS3 compliance. The 1.5KE100CA from Diotec Semiconductor shows "Not applicable" RoHS status; verify compliance requirements with the manufacturer before selection.

Q: What should I consider when switching from P600 to DO-201 package?

A: Package changes require PCB footprint verification, lead spacing confirmation, and mechanical clearance validation. Electrical performance remains compatible within the specified voltage ranges, but physical layout modifications may be necessary.

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