SMAJ43CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ43CA-13 is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in a surface mount DO-214AC (SMA) package. This component is designed for general-purpose transient voltage suppression applications with a 43V reverse standoff voltage and 69.4V maximum clamping voltage. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	43	V
Breakdown Voltage (Min)	47.8	V
Clamping Voltage (Max) @ Ipp	69.4	V
Peak Pulse Current (10/1000µs)	5.7	A
Peak Pulse Power	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ43CA-13 is determined by the following critical parameters:

Reverse standoff voltage: 43V (±tolerance)
Breakdown voltage minimum: 47.8V
Clamping voltage maximum: 69.4V
Peak pulse current: 5.7A minimum
Peak pulse power: 400W
Package: DO-214AC (SMA) surface mount
Bidirectional operation: 1 channel
Operating temperature range: -55°C to 150°C minimum

Substitute parts are grouped into two categories:

Direct Electrical Equivalents: Parts with identical or tighter electrical specifications (clamping voltage ≤69.4V, peak current ≥5.7A) and matching package type.

Higher Performance Alternatives: Parts with the same standoff and breakdown voltages but higher clamping voltage or peak current ratings, suitable for applications requiring enhanced transient suppression capability.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Voltage (V)	Clamping Voltage (V)	Peak Current (A)	Peak Power (W)	Package	Product Status	RoHS Status
SMAJ43CA-13	Diodes Incorporated	43	47.8	69.4	5.7	400	DO-214AC (SMA)	Discontinued	Non-compliant
SMAJ43CA-13-F	Diodes Incorporated	43	47.8	69.4	5.7	400	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CA	Good-Ark Semiconductor	43	47.8	69.4	5.8	400	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CA-TP	Micro Commercial Co	43	47.8	69.4	5.7	400	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43A	MDD	43	47.8	69.4	5.8	400	DO-214AC (SMA)	Active	ROHS3 Compliant
SM4T50CAY	STMicroelectronics	43	47.8	91	25 (8/20µs)	400	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CA-TR	STMicroelectronics	43	47.8	91	25 (8/20µs)	400	DO-214AC (SMA)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SMAJ43CA-13-F (Diodes Incorporated) is the direct equivalent with identical electrical specifications and active product status. This part is ROHS3 compliant and available in tape and reel packaging, making it the preferred replacement for the discontinued SMAJ43CA-13.

SMAJ43CA (Good-Ark Semiconductor) and SMAJ43A (MDD) provide equivalent performance with marginally higher peak current ratings (5.8A vs 5.7A). Both are active products with ROHS3 compliance and suitable for direct substitution in existing designs.

SMAJ43CA-TP (Micro Commercial Co) matches the original specifications exactly with 5.7A peak current and is ROHS3 compliant with active product status.

Higher Performance Alternatives:

SM4T50CAY and SMAJ43CA-TR (both STMicroelectronics) maintain the same 43V standoff and 47.8V breakdown voltages but feature higher clamping voltage (91V) and significantly higher peak current capability (25A at 8/20µs pulse). These parts are suitable for applications requiring enhanced transient suppression margin or higher energy absorption capacity. SM4T50CAY carries AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ43CA-13-F be used as a direct replacement for SMAJ43CA-13?

A: Yes. SMAJ43CA-13-F is electrically identical with the same 43V standoff, 69.4V clamping voltage, and 5.7A peak current. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). Packaging is tape and reel format.

Q: What is the difference between SMAJ43CA from Good-Ark and SMAJ43A from MDD?

A: Both parts have identical electrical specifications (43V standoff, 69.4V clamping, 400W peak power) with marginally higher peak current (5.8A vs. 5.7A). The difference is manufacturer. Both are active, ROHS3 compliant, and suitable for direct substitution.

Q: When should SM4T50CAY or SMAJ43CA-TR be selected instead of direct equivalents?

A: These STMicroelectronics parts feature higher clamping voltage (91V) and peak current (25A at 8/20µs). Select these when the application requires greater transient suppression margin, higher energy absorption, or automotive-grade qualification (SM4T50CAY is AEC-Q101 qualified).

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitutes use the DO-214AC (SMA) surface mount package, ensuring mechanical and electrical compatibility with the original SMAJ43CA-13 footprint.

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

A: Direct equivalents (SMAJ43CA-13-F, SMAJ43CA, SMAJ43CA-TP) operate from -55°C to 150°C (TJ). SMAJ43A operates from -50°C to 150°C (TJ). SM4T50CAY and SMAJ43CA-TR operate from -55°C to 150°C (TJ). All meet or exceed the original specification.

Q: Are all substitutes RoHS compliant?

A: The original SMAJ43CA-13 is RoHS non-compliant. All listed substitutes are ROHS3 compliant, making them suitable for applications with RoHS requirements.

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