P4SMA7.5 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The P4SMA7.5 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 6.4V reverse standoff voltage, 11.87V maximum clamping voltage, and 36.3A peak pulse current capability in a DO-214AC (SMA) package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	6.4	V
Voltage - Breakdown (Min)	6.77	V
Voltage - Clamping (Max) @ Ipp	11.87	V
Current - Peak Pulse (10/1000µs)	36.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the P4SMA7.5 is determined by the following critical parameters:

Reverse Standoff Voltage (Vr): Must remain within the 6.0V to 6.5V range to maintain circuit protection thresholds
Clamping Voltage (Vc): Maximum clamping voltage must not exceed 12.1V to prevent downstream component damage
Peak Pulse Current (Ipp): Minimum 33.3A capability required to handle transient energy
Peak Pulse Power: Minimum 400W rating required
Package Type: DO-214AC (SMA) surface-mount package mandatory for PCB compatibility
Operating Temperature Range: Minimum -50°C to 150°C required for industrial applications
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories: direct equivalents (P4SMA7.5A) and functional alternatives (SMAJ and SMA6J series) that meet the core protection parameters while accommodating minor variations in electrical characteristics within acceptable design margins.

Parameter Comparison

Part Number	Manufacturer	Vr (Typ) [V]	Vbr (Min) [V]	Vc (Max) [V]	Ipp [A]	Power [W]	Temp Range [°C]	Status
P4SMA7.5	Littelfuse Inc.	6.4	6.77	11.87	36.3	400	-65 to 150	Obsolete
P4SMA7.5A	Taiwan Semiconductor Corporation	6.4	7.13	11.3	37	400	-55 to 150	Active
SMAJ6.0A	MDD	6.0	6.67	10.3	38.8	400	-50 to 150	Active
SMAJ6.5A	MDD	6.5	7.22	11.2	35.7	400	-50 to 150	Active
SMAJ7.0A	MDD	7.0	7.78	12.0	33.3	400	-50 to 150	Active
SMA6J6.0A-TP	Micro Commercial Co	6.0	6.67	10.3	58.3	600	-55 to 175	Active
SMAJP4KE6.8A-TP	Micro Commercial Co	5.8	6.45	10.5	39	400	-55 to 175	Active
SMAJP4KE8.2A-TP	Micro Commercial Co	7.0	7.79	12.1	33.9	400	-55 to 175	Active

Engineering Selection Recommendations

Primary Substitute: P4SMA7.5A (Taiwan Semiconductor Corporation)

The P4SMA7.5A is the direct functional equivalent with identical reverse standoff voltage (6.4V) and comparable clamping characteristics (11.3V vs. 11.87V). This part maintains the same P4SMA series designation, confirming design compatibility. Active product status ensures long-term availability. ROHS3 compliance and unlimited MSL rating match the original specification. Operating temperature range (-55°C to 150°C) covers most industrial applications, with the exception of the original part's extended low-temperature capability (-65°C).

Secondary Substitutes: SMAJ Series (MDD)

The SMAJ6.5A offers the closest voltage profile (6.5V standoff, 11.2V clamp) with active status and full compliance certification. The SMAJ6.0A and SMAJ7.0A provide alternative voltage ratings within acceptable protection margins. All SMAJ parts maintain 400W power rating and DO-214AC packaging. Operating temperature range (-50°C to 150°C) is suitable for standard industrial environments.

Extended-Capability Alternatives: SMA6J and SMAJP4KE Series (Micro Commercial Co)

The SMA6J6.0A-TP and SMAJP4KE series offer enhanced specifications including higher peak pulse current (58.3A for SMA6J6.0A-TP) and extended temperature range (-55°C to 175°C). The SMA6J6.0A-TP provides 600W peak pulse power, exceeding the original 400W rating. These parts are suitable for applications requiring higher transient energy absorption or operation in elevated-temperature environments. The SMAJP4KE8.2A-TP matches the original clamping voltage (12.1V) with enhanced current handling (33.9A).

All substitute parts maintain unidirectional Zener-type operation, single-channel configuration, and DO-214AC (SMA) surface-mount packaging required for direct PCB replacement.

Frequently Asked Questions (FAQ)

Q: Can P4SMA7.5A be used as a direct drop-in replacement for P4SMA7.5?

A: Yes. The P4SMA7.5A maintains identical reverse standoff voltage (6.4V), comparable clamping voltage (11.3V vs. 11.87V), and equivalent peak pulse current (37A vs. 36.3A). Both parts use DO-214AC (SMA) packaging and share the P4SMA series designation. The primary difference is operating temperature range: P4SMA7.5A operates from -55°C (vs. -65°C for the original).

Q: What is the difference between SMAJ and SMA6J series substitutes?

A: Both series are functionally compatible in DO-214AC (SMA) packaging. The SMAJ series (MDD) offers standard 400W peak pulse power with operating range -50°C to 150°C. The SMA6J series (Micro Commercial Co) provides enhanced specifications: 600W peak pulse power and extended temperature range (-55°C to 175°C). Selection depends on application thermal and transient energy requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original P4SMA7.5 specification. All parts also maintain unlimited MSL (Moisture Sensitivity Level 1) rating.

Q: Which substitute offers the closest electrical match to P4SMA7.5?

A: The P4SMA7.5A (Taiwan Semiconductor Corporation) provides the closest match with identical 6.4V reverse standoff voltage and minimal clamping voltage variation (11.3V vs. 11.87V). This part is recommended as the primary replacement for direct circuit substitution.

Q: Can SMAJP4KE8.2A-TP be used in place of P4SMA7.5?

A: Yes, with design consideration. The SMAJP4KE8.2A-TP matches the original clamping voltage (12.1V) and provides equivalent peak pulse current (33.9A). However, the reverse standoff voltage is higher (7.0V vs. 6.4V), which may affect circuit protection thresholds. This part is suitable for applications where higher standoff voltage is acceptable or beneficial.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use DO-214AC (SMA) surface-mount packaging, ensuring direct PCB footprint compatibility with the original P4SMA7.5. No layout or assembly modifications are required for mechanical integration.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message