P6SMB100 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The P6SMB100 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a reverse standoff voltage of 85.5V and provides clamping at 143.85V with a peak pulse current of 4.5A. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage – Reverse Standoff (Typ)	85.5	V
Voltage – Breakdown (Min)	90	V
Voltage – Clamping (Max) @ Ipp	143.85	V
Current – Peak Pulse (10/1000µs)	4.5	A
Power – Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P6SMB100 is determined by the following critical electrical and mechanical parameters:

Voltage – Reverse Standoff (Typ): Must be 85V to 85.5V to ensure proper circuit protection threshold
Voltage – Clamping (Max) @ Ipp: Must not exceed 143.85V to prevent overvoltage stress on protected circuitry
Current – Peak Pulse (10/1000µs): Must be ≥4.4A to handle transient surge events
Power – Peak Pulse: Must be 600W to match thermal dissipation capability
Package / Case: Must be DO-214AA or SMB to ensure PCB footprint compatibility
Mounting Type: Must be Surface Mount for assembly compatibility
Operating Temperature Range: Must support -55°C to 150°C minimum to cover application requirements
Type: Must be Zener diode, unidirectional configuration

Substitute parts are grouped into two categories: direct equivalents (same manufacturer series with active product status) and cross-manufacturer alternatives (different manufacturers meeting identical electrical specifications).

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Vc (V)	Ipp (A)	Temp Range (°C)	Status	RoHS
P6SMB100	Littelfuse Inc.	85.5	143.85	4.5	-55 to 150	Obsolete	ROHS3
P6SMB100A	Eaton – Electronics Division	85.5	137	4.5	-55 to 150	Active	RoHS
P6SMB100A-E3/52	Vishay General Semiconductor	85.5	137	4.4	-65 to 150	Active	ROHS3
P6SMB100A-M3/52	Vishay General Semiconductor	85.5	137	4.4	-65 to 150	Active	ROHS3
P6SMB100A-M3/5B	Vishay General Semiconductor	85.5	137	4.4	-65 to 150	Active	ROHS3
SZP6SMB100AT3G	Littelfuse Inc.	85.5	137	4.4	-65 to 150	Active	ROHS3
SMBJ85A	Meritek	85	137	4.38	-55 to 150	Active	ROHS3
SMBJ85AE3/TR13	Microchip Technology	85	137	4.4	-65 to 150	Active	ROHS3
SMBJP6KE100A-TP	Micro Commercial Co	85.5	137	4.5	-55 to 175	Active	ROHS3
SM6T100A	STMicroelectronics	85.5	178	22.5 (8/20µs)	-55 to 150	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

The following parts are recommended as primary substitutes based on active product status, full RoHS3 compliance, and electrical parameters within acceptable tolerance:

P6SMB100A (Eaton): Active status with matching 85.5V standoff voltage and 4.5A peak pulse current. Clamping voltage of 137V is lower than the original 143.85V, providing enhanced protection margin. Suitable for immediate production use.
P6SMB100A-E3/52 (Vishay): Active status with extended temperature range (-65°C to 150°C). Clamping voltage of 137V and 4.4A peak pulse current meet substitution criteria. High inventory availability (22,800 pcs) supports supply chain continuity.
SZP6SMB100AT3G (Littelfuse): Active status from original manufacturer. Maintains 85.5V standoff voltage with AEC-Q101 automotive qualification and extended temperature range (-65°C to 150°C). Recommended for automotive and high-reliability applications.

Secondary Substitutes (Cross-Manufacturer Alternatives)

SMBJP6KE100A-TP (Micro Commercial Co): Active status with matching 85.5V standoff and 4.5A peak pulse current. Extended upper temperature limit (175°C) provides thermal margin for high-temperature environments.
SMBJ85AE3/TR13 (Microchip Technology): Active status with 85V standoff voltage (within tolerance of 85.5V specification). Extended temperature range (-65°C to 150°C) and 4.4A peak pulse current meet functional requirements.

Not Recommended for Direct Substitution

SM6T100A (STMicroelectronics): Although electrically compatible in standoff voltage (85.5V), the clamping voltage of 178V significantly exceeds the original 143.85V specification. The peak pulse current of 22.5A (8/20µs) is substantially higher than the 4.5A (10/1000µs) specification, indicating different pulse waveform characteristics. This part is suitable only for applications requiring higher surge current handling and is not a direct equivalent.

Frequently Asked Questions (FAQ)

Q: Why is the P6SMB100 obsolete, and what does this mean for my design?

A: The P6SMB100 has reached end-of-life status with the manufacturer. Active substitute parts with identical or superior electrical characteristics are available from multiple manufacturers. Designs should transition to active alternatives to ensure long-term supply availability and continued manufacturing support.

Q: Can I use P6SMB100A as a direct replacement for P6SMB100?

A: Yes. The P6SMB100A maintains the same 85.5V reverse standoff voltage and 4.5A peak pulse current. The clamping voltage is reduced from 143.85V to 137V, which provides improved overvoltage protection without compromising circuit compatibility. This part is in active production status.

Q: What is the difference between clamping voltage specifications, and does it affect substitution?

A: Clamping voltage (Vc) is the maximum voltage across the diode during a transient surge event. The original P6SMB100 clamps at 143.85V, while most substitutes clamp at 137V. A lower clamping voltage provides better protection for downstream components. Substitutes with clamping voltages ≤143.85V are acceptable and often preferable.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: Can I use SM6T100A as a substitute?

A: SM6T100A is not recommended as a direct substitute. While it shares the same 85.5V standoff voltage and 600W power rating, its clamping voltage of 178V exceeds the original specification by 34.15V, and its peak pulse current of 22.5A (measured at 8/20µs waveform) is substantially higher than the 4.5A (10/1000µs) specification. This part is designed for higher-energy transient suppression and may not be compatible with circuits designed for the original P6SMB100 characteristics.

Q: Do all substitute parts use the same DO-214AA (SMB) package?

A: Yes. All listed substitute parts use the DO-214AA or SMB package designation, ensuring PCB footprint and assembly compatibility. Verify specific supplier device package designations (e.g., SMBJ) with component datasheets if custom assembly tooling is involved.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging is supplied on continuous carrier tape for automated pick-and-place assembly, typically used for high-volume production. Cut Tape packaging is supplied in smaller quantities on cut segments of carrier tape, suitable for lower-volume or prototype applications. Both formats contain identical components; packaging selection depends on production volume and assembly equipment compatibility.

Q: Should I select a substitute with an extended temperature range?

A: Extended temperature range parts (e.g., -65°C to 150°C vs. -55°C to 150°C) provide additional thermal margin and are suitable for applications in extreme environments. If your circuit operates within the standard -55°C to 150°C range, standard-range parts are sufficient. Extended-range parts are recommended for automotive, industrial, or aerospace applications.

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