P4SMA39C Equivalent & Substitute Parts

Part Overview

The P4SMA39C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 33.3V reverse standoff voltage with a 56.6V maximum clamping voltage and 7.6A peak pulse current capability in a DO-214AC (SMA) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33.3	V
Voltage - Breakdown (Min)	35.25	V
Voltage - Clamping (Max) @ Ipp	56.6	V
Current - Peak Pulse (10/1000µs)	7.6	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P4SMA39C is determined by strict equivalence in the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Clamping (Max) @ Ipp: 53.9V to 56.6V range
Current - Peak Pulse (10/1000µs): 7.4A to 7.7A range
Power - Peak Pulse: 400W
Package / Case: DO-214AC or SMA
Mounting Type: Surface Mount
Type: Zener, Bidirectional
Bidirectional Channels: 1

All identified substitute parts maintain the P4SMA series designation and operate within the specified voltage and current parameters. Variations in clamping voltage (53.9V to 56.6V) and peak pulse current (7.4A to 7.7A) remain within acceptable tolerance ranges for TVS diode functionality. Package designations (SMA, DO-214AC, SMAJ) are mechanically compatible for surface-mount PCB assembly.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Breakdown (Min) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Power - Peak Pulse [W]	Operating Temperature [°C]	Package / Case	Product Status
P4SMA39C	Littelfuse Inc.	33.3	35.25	56.6	7.6	400	-65 to 150	DO-214AC, SMA	Obsolete
P4SMA39CA	Eaton - Electronics Division	33.3	37.1	53.9	7.6	400	-55 to 150	DO-214AC, SMA	Active
P4SMA39C	Taiwan Semiconductor Corporation	31.6	35.1	56.4	7.4	400	-55 to 150	DO-214AC, SMA	Active
P4SMA39CA R3G	Taiwan Semiconductor Corporation	33.3	37.05	53.9	7.7	400	-55 to 150	DO-214AC, SMA	Discontinued at DiGi Electronics
P4SMA39CAH	Taiwan Semiconductor Corporation	33.3	37.1	53.9	7.7	400	-55 to 150	DO-214AC, SMA	Active
SMAJP4KE39CA-TP	Micro Commercial Co	33.3	37.1	53.9	7.6	400	-55 to 175	DO-214AC, SMAJ	Active

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete P4SMA39C, the following selection criteria apply based on product status and compliance:

Primary Recommendation: P4SMA39CAH (Taiwan Semiconductor Corporation) is an active product with RoHS3 compliance, AEC-Q101 automotive qualification, and electrical parameters matching the original specification. This part is suitable for new designs and production environments requiring automotive-grade reliability.

Secondary Recommendation: P4SMA39CA (Eaton - Electronics Division) is an active product with 72,800 units in stock and established supply chain availability. This part meets the electrical requirements with a slightly lower clamping voltage (53.9V vs. 56.6V) within acceptable TVS diode tolerance ranges. Note that this variant is RoHS non-compliant.

Alternative Option: SMAJP4KE39CA-TP (Micro Commercial Co) provides the widest operating temperature range (-55 to 175°C) and is suitable for high-temperature applications. The SMAJ package variant maintains mechanical compatibility with standard SMA footprints.

Not Recommended for New Designs: P4SMA39CA R3G is discontinued at DiGi Electronics and should not be selected for new production despite active status at the manufacturer.

Frequently Asked Questions (FAQ)

Q: Can P4SMA39CA be used as a direct replacement for P4SMA39C?

A: Yes. Both parts share identical reverse standoff voltage (33.3V), peak pulse power (400W), and peak pulse current (7.6A). The clamping voltage difference (53.9V vs. 56.6V) falls within normal TVS diode manufacturing tolerances and does not affect functional compatibility in overvoltage protection circuits.

Q: What is the difference between P4SMA39CA and P4SMA39CAH?

A: Both parts are manufactured by Taiwan Semiconductor Corporation and share identical electrical parameters. P4SMA39CAH includes AEC-Q101 automotive qualification and is designated for automotive-grade applications. P4SMA39CA is the standard industrial variant. Selection depends on application requirements for automotive certification.

Q: Are SMA and SMAJ packages interchangeable?

A: SMA and SMAJ packages are mechanically compatible for surface-mount PCB assembly. Both are DO-214AC variants with identical lead spacing and footprint dimensions. SMAJP4KE39CA-TP uses the SMAJ designation but maintains full compatibility with standard SMA PCB layouts.

Q: Does the operating temperature range affect substitution?

A: The original P4SMA39C operates from -65°C to 150°C. Substitute parts operate from -55°C to 150°C (or -55°C to 175°C for SMAJP4KE39CA-TP). If the application requires operation below -55°C, the original Littelfuse part or equivalent with extended low-temperature rating must be specified. For standard industrial and telecom applications, the -55°C minimum is acceptable.

Q: What is the significance of RoHS compliance status?

A: P4SMA39CA (Eaton) is RoHS non-compliant, while P4SMA39CAH and P4SMA39C (Taiwan Semiconductor) are RoHS3 compliant. For applications subject to RoHS regulations or customer requirements, select RoHS3-compliant variants (P4SMA39CAH or Taiwan Semiconductor P4SMA39C).

Q: Why is P4SMA39CA R3G listed as discontinued?

A: P4SMA39CA R3G is discontinued at DiGi Electronics but may remain available through other distributors. This part should not be selected for new designs due to uncertain long-term supply availability. Use P4SMA39CAH or P4SMA39CA instead.

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