P4SMA82A Equivalent & Substitute Parts

Part Overview

The P4SMA82A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 70.1V reverse standoff voltage with 113V maximum clamping voltage and 3.6A peak pulse current capability in a DO-214AC (SMA) package. This part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70.1	V
Voltage - Breakdown (Min)	77.9	V
Voltage - Clamping (Max) @ Ipp	113	V
Current - Peak Pulse (10/1000µs)	3.6	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	-
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA82A is determined by the following critical parameters:

Reverse standoff voltage within 70V to 70.1V range
Clamping voltage at 113V maximum
Peak pulse current capability of 4.6A or greater
DO-214AC (SMA) package compatibility
Surface mount mounting type
Active product status
ROHS3 compliance

The substitute parts SMAJ70A (MDD), SMAJ70A-13-F (Diodes Incorporated), and SMAJ70A-TR (STMicroelectronics) meet these criteria with matching or superior electrical specifications. SMAJ75A (MDD) is included as a substitute with higher voltage rating (75V standoff, 121V clamping) for applications requiring elevated voltage protection margins.

Parameter Comparison

Parameter	P4SMA82A (Littelfuse)	SMAJ70A (MDD)	SMAJ75A (MDD)	SMAJ70A-13-F (Diodes Inc.)	SMAJ70A-TR (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	70.1V	70V	75V	70V	70V
Voltage - Breakdown (Min)	77.9V	77.8V	83.3V	77.8V	77.8V
Voltage - Clamping (Max) @ Ipp	113V	113V	121V	113V	146V
Current - Peak Pulse (10/1000µs)	3.6A	4.6A	3.3A	4.6A	16A (8/20µs)
Power - Peak Pulse	400W	400W	400W	400W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature Range	-65 to 150°C	-50 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

All substitute parts maintain Active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the P4SMA82A. SMAJ70A variants from MDD, Diodes Incorporated, and STMicroelectronics provide direct electrical equivalence with matching 70V standoff and 113V clamping specifications. SMAJ75A offers higher voltage protection at 75V standoff and 121V clamping for circuits requiring additional margin. SMAJ70A-TR from STMicroelectronics provides significantly higher peak pulse current (16A) and clamping voltage (146V) for applications with more demanding transient suppression requirements. Selection should be based on specific circuit voltage and current requirements, operating temperature constraints, and packaging availability.

Frequently Asked Questions (FAQ)

Q: Can SMAJ70A replace P4SMA82A directly? A: Yes. SMAJ70A from MDD, Diodes Incorporated (SMAJ70A-13-F), and STMicroelectronics (SMAJ70A-TR) provide equivalent reverse standoff voltage (70V), clamping voltage (113V), and DO-214AC (SMA) package compatibility. Peak pulse current specifications (4.6A to 16A) meet or exceed the P4SMA82A requirement of 3.6A.

Q: What is the difference between SMAJ70A and SMAJ75A? A: SMAJ75A features higher voltage ratings: 75V reverse standoff versus 70V, and 121V clamping versus 113V. Peak pulse current is lower at 3.3A compared to 4.6A. SMAJ75A is suitable for circuits requiring elevated overvoltage protection margins.

Q: Are all substitutes available in Tape & Reel packaging? A: SMAJ70A-13-F (Diodes Incorporated) and SMAJ70A-TR (STMicroelectronics) are specified with Tape & Reel (TR) packaging. SMAJ70A (MDD) and SMAJ75A (MDD) do not specify packaging format in the provided data.

Q: What is the operating temperature difference between P4SMA82A and substitutes? A: P4SMA82A operates from -65°C to 150°C. SMAJ70A (MDD) and SMAJ75A (MDD) operate from -50°C to 150°C. SMAJ70A-13-F and SMAJ70A-TR operate from -55°C to 150°C. Applications requiring operation below -55°C must use the P4SMA82A.

Q: Why does SMAJ70A-TR have higher clamping voltage (146V) than other 70V standoff parts? A: SMAJ70A-TR from STMicroelectronics is specified with different pulse current parameters (16A at 8/20µs versus 4.6A at 10/1000µs), resulting in higher clamping voltage. This part is suitable for high-current transient suppression applications.

Q: Are all parts ROHS3 compliant? A: Yes. P4SMA82A and all substitute parts are ROHS3 compliant. SMAJ70A-13-F and SMAJ70A-TR are REACH Unaffected; P4SMA82A and MDD variants are REACH Affected.

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