Littelfuse 3KP9.0-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP9.0-B is a unidirectional Zener transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This component features a 9V reverse standoff voltage, 16.17V maximum clamping voltage, and 194.8A peak pulse current capability in a through-hole P600 axial package. The product is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	9V	V
Breakdown Voltage (Min)	9.5V	V
Clamping Voltage (Max) @ Ipp	16.17V	V
Peak Pulse Current (10/1000µs)	194.8A	A
Peak Pulse Power	3000W	W
Operating Temperature Range	-55°C to 175°C	°C (TJ)
Package Type	P600, Axial	Through Hole
Diode Type	Zener	Unidirectional
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 3KP9.0-B is determined by the following critical parameters:

Primary Electrical Criteria:

Reverse standoff voltage: 9V nominal
Clamping voltage range: 15.4V to 16.17V maximum
Peak pulse current capability: minimum 194.8A
Peak pulse power: minimum 3000W

Mechanical Criteria:

Through-hole mounting requirement
Package compatibility: P600 axial or equivalent form factor

Compliance Requirements:

ROHS3 compliance
Operating temperature range: -55°C to 175°C

Substitute parts are grouped into two categories based on package type: P600 axial package (direct mechanical substitutes) and alternative through-hole packages (DO-15/DO-204AC) that maintain electrical performance within acceptable parameters.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Product Status
3KP9.0-B	Littelfuse Inc.	9	16.17	194.8	3000	P600, Axial	Obsolete
5KP9.0A-B	Littelfuse Inc.	9	15.4	331.2	5000	P600, Axial	Active
3KP9.0A-TP	Micro Commercial Co	9	15.4	194.8	3000	R-6, Axial	Active
5KP9.0A-E3/54	Vishay General Semiconductor	9	15.4	325	5000	P600, Axial	Active
P4KE9.1A	Taiwan Semiconductor Corporation	7.78	13.4	31	400	DO-204AL (DO-41), Axial	Active
P6KE10A	Fairchild Semiconductor	8.5	14.5	43	600	DO-15 (DO-204AC), Axial	Active
P6KE9.1A	Taiwan Semiconductor Corporation	7.78	13.4	47	600	DO-15 (DO-204AC), Axial	Active
SA7.5A	Taiwan Semiconductor Corporation	7.5	12.9	40	500	DO-15 (DO-204AC), Axial	Active
SA8.0A	Taiwan Semiconductor Corporation	8	13.6	38	500	DO-15 (DO-204AC), Axial	Active
SA8.5A	Taiwan Semiconductor Corporation	8.5	14.4	36	500	DO-15 (DO-204AC), Axial	Active
SA9.0A	Taiwan Semiconductor Corporation	9	15.4	34	500	DO-15 (DO-204AC), Axial	Active

Engineering Selection Recommendations

Direct P600 Package Substitutes (Preferred for Pin-Compatible Replacement):

The 5KP9.0A-B (Littelfuse Inc.) and 5KP9.0A-E3/54 (Vishay General Semiconductor) maintain identical P600 axial package geometry and 9V standoff voltage specification. Both components exceed the original 194.8A peak pulse current requirement with 331.2A and 325A respectively, and provide 5000W peak pulse power versus the original 3000W. Both are ROHS3 compliant and rated for -55°C to 175°C operation.

The 3KP9.0A-TP (Micro Commercial Co) provides electrical equivalence with matching 194.8A peak pulse current and 3000W power rating at 9V standoff voltage. Package geometry differs (R-6 versus P600), requiring mechanical verification for board-level compatibility.

Alternative Package Substitutes (Functional Equivalence with Package Change):

Components in the SA series (SA9.0A, SA8.5A, SA8.0A, SA7.5A) and P6KE series (P6KE9.1A, P6KE10A) utilize DO-15 (DO-204AC) or DO-41 (DO-204AL) through-hole packages. These alternatives provide functional overvoltage protection within the 7.5V to 9V standoff voltage range and 12.9V to 15.4V clamping voltage range. Peak pulse current capabilities range from 31A to 47A with power ratings from 400W to 600W. Package substitution requires PCB layout modification and is suitable only when mechanical constraints permit.

All recommended substitutes maintain ROHS3 compliance and -55°C to 175°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 5KP9.0A-B directly replace the 3KP9.0-B without PCB modification?

A: Yes. The 5KP9.0A-B maintains identical P600 axial package geometry and 9V standoff voltage. Pin-to-pin compatibility is preserved. The higher peak pulse current (331.2A versus 194.8A) and power rating (5000W versus 3000W) provide enhanced protection margin.

Q: What is the difference between P600 and DO-15 packages?

A: P600 and DO-15 are distinct through-hole axial package formats with different physical dimensions and lead spacing. P600 packages are larger and accommodate higher current ratings. DO-15 packages are smaller. Direct substitution between these packages requires PCB redesign.

Q: Are SA series components suitable replacements for the 3KP9.0-B?

A: SA series components (SA9.0A, SA8.5A, SA8.0A, SA7.5A) provide functional overvoltage protection with 9V, 8.5V, 8V, and 7.5V standoff voltages respectively. However, peak pulse current capabilities (34A to 40A) and power ratings (500W) are significantly lower than the original 194.8A and 3000W specification. Selection depends on application current requirements.

Q: What compliance certifications apply to substitute parts?

A: All listed substitute components maintain ROHS3 compliance. Vishay 5KP9.0A-E3/54 and Taiwan Semiconductor Corporation parts (P6KE9.1A, SA series) carry REACH Unaffected designation. Compliance documentation should be verified against specific application requirements.

Q: Can lower standoff voltage components (7.5V to 8.5V) replace the 9V specification?

A: Lower standoff voltage components trigger protection at reduced voltage thresholds. Selection of 7.5V, 8V, or 8.5V standoff voltage alternatives is valid only when the protected circuit operates at or below these voltage levels. Application voltage requirements must be confirmed before substitution.

Q: What is the operating temperature range for substitute components?

A: All substitute components listed maintain -55°C to 175°C (TJ) operating temperature range, matching the original 3KP9.0-B specification. Fairchild Semiconductor P6KE10A operates at -50°C to 175°C, providing a 5°C reduced lower temperature limit.

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