SMAJ36C Equivalent & Substitute Parts

Part Overview

The SMAJ36C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 36V reverse standoff voltage with a 61.01V maximum clamping voltage and 6.9A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ36C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives from multiple manufacturers provide functionally compatible solutions with comparable electrical characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	36	V
Voltage - Breakdown (Min)	37.89	V
Voltage - Clamping (Max) @ Ipp	61.01	V
Current - Peak Pulse (10/1000µs)	6.9	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ36C is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 36V (exact match required)
Voltage - Clamping (Max) @ Ipp: 58.1V to 64.3V (acceptable range for SMAJ36C alternatives)
Current - Peak Pulse (10/1000µs): 6.9A minimum (higher values acceptable)
Power - Peak Pulse: 400W minimum (higher values acceptable)
Package / Case: DO-214AC, SMA (exact match required)
Mounting Type: Surface Mount (exact match required)
RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: 1 (Unlimited) (required)

Substitute parts are grouped into two categories:

Direct Electrical Equivalents (58.1V Clamping): SMAJ36CA (MDD), SZ1SMA36CAT3G (Littelfuse Inc.), SMAJ36CA-13-F (Diodes Incorporated), SMAJ36CA-TP (Micro Commercial Co), and TV04A360JB-G (Comchip Technology). These parts maintain the 36V reverse standoff voltage with 58.1V clamping voltage and 6.9A peak pulse current, providing direct functional replacement.
Enhanced Performance Alternatives: SMAJ36CAE3/TR13 (Microchip Technology) with 8.6A peak pulse current and 500W power rating, and SMAJ36CE3/TR13 (Microchip Technology) with 64.3V clamping voltage, 9.8A peak pulse current, and 500W power rating. These parts exceed the original specifications and are suitable where higher transient energy absorption is required.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	Package
SMAJ36C	Littelfuse Inc.	36	61.01	6.9	400	-65 to 150	Obsolete	DO-214AC, SMA
SMAJ36CA	MDD	36	58.1	6.9	400	-50 to 150	Active	DO-214AC, SMA
SZ1SMA36CAT3G	Littelfuse Inc.	36	58.1	6.9	400	-65 to 150	Active	DO-214AC, SMA
SMAJ36CA-13-F	Diodes Incorporated	36	58.1	6.9	400	-55 to 150	Active	DO-214AC, SMA
SMAJ36CA-TP	Micro Commercial Co	36	58.1	6.9	400	-55 to 175	Active	DO-214AC, SMA
TV04A360JB-G	Comchip Technology	36	58.1	6.88	400	-55 to 150	Active	DO-214AC, SMA
SMAJ36CAE3/TR13	Microchip Technology	36	58.1	8.6	500	-65 to 150	Active	DO-214AC, SMA
SMAJ36CE3/TR13	Microchip Technology	36	64.3	9.8	500	-65 to 150	Active	DO-214AC, SMA

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

Select SMAJ36CA (MDD), SZ1SMA36CAT3G (Littelfuse Inc.), SMAJ36CA-13-F (Diodes Incorporated), SMAJ36CA-TP (Micro Commercial Co), or TV04A360JB-G (Comchip Technology) when the original SMAJ36C specifications are required. All five parts maintain the 36V reverse standoff voltage, 58.1V clamping voltage, and 6.9A peak pulse current. All are ROHS3 compliant with MSL 1 (Unlimited) rating. SZ1SMA36CAT3G is recommended for designs requiring the original -65°C to 150°C operating temperature range and Littelfuse manufacturer continuity. SMAJ36CA-TP extends the upper operating temperature to 175°C, suitable for high-temperature applications.

For Enhanced Protection (Higher Performance):

Select SMAJ36CAE3/TR13 (Microchip Technology) when higher transient energy absorption is required within the same clamping voltage specification. This part provides 8.6A peak pulse current and 500W power rating while maintaining the 36V reverse standoff and 58.1V clamping voltage. Operating temperature range is -65°C to 150°C.

Select SMAJ36CE3/TR13 (Microchip Technology) when both higher clamping voltage and peak pulse current are acceptable. This part provides 64.3V clamping voltage, 9.8A peak pulse current, and 500W power rating. Operating temperature range is -65°C to 150°C.

All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can SMAJ36CA be used as a direct replacement for SMAJ36C?

A: Yes. SMAJ36CA maintains the critical electrical parameters: 36V reverse standoff voltage, 58.1V clamping voltage, and 6.9A peak pulse current. Both are packaged in DO-214AC (SMA) surface-mount format. The primary difference is product status (SMAJ36C is obsolete; SMAJ36CA is active) and operating temperature range (SMAJ36CA operates -50°C to 150°C versus SMAJ36C at -65°C to 150°C). For applications within the -50°C to 150°C range, SMAJ36CA is functionally equivalent.

Q: What is the difference between the 58.1V and 64.3V clamping voltage options?

A: The clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. SMAJ36CAE3/TR13 clamps at 58.1V, while SMAJ36CE3/TR13 clamps at 64.3V. Selection depends on the protected circuit's voltage tolerance. Lower clamping voltage (58.1V) provides tighter protection; higher clamping voltage (64.3V) allows higher transient voltages to pass through. Both maintain the 36V reverse standoff voltage.

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

A: Yes. All substitute parts listed are packaged in DO-214AC (SMA) surface-mount format, ensuring mechanical and electrical compatibility with the original SMAJ36C footprint. Packaging options vary by manufacturer (Tape & Reel, Cut Tape, or bulk), but the component package itself remains DO-214AC (SMA).

Q: Which substitute part should I select for extended temperature applications?

A: SMAJ36CA-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to 150°C for most alternatives. This part is suitable for high-temperature environments while maintaining the 36V reverse standoff voltage, 58.1V clamping voltage, and 6.9A peak pulse current.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: Can I use SMAJ36CAE3/TR13 or SMAJ36CE3/TR13 in place of SMAJ36C?

A: Yes, with design verification. Both parts maintain the 36V reverse standoff voltage but offer enhanced performance. SMAJ36CAE3/TR13 provides higher peak pulse current (8.6A versus 6.9A) and power rating (500W versus 400W) at the same 58.1V clamping voltage. SMAJ36CE3/TR13 provides even higher clamping voltage (64.3V), peak pulse current (9.8A), and power rating (500W). These parts are suitable for applications requiring greater transient energy absorption or higher voltage tolerance.

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