SMAJ36 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ36 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 36V reverse standoff voltage and provides peak pulse current handling of 6.9A in a DO-214AC (SMA) package. The SMAJ36 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing production and repair applications.

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	—

Substitute Part Grouping Explanation

Substitution of the SMAJ36 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 36V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener (Unidirectional)
Unidirectional Channels: 1

Secondary Compatibility Parameters:

Voltage - Breakdown (Min): 37.89V to 40V range
Voltage - Clamping (Max) @ Ipp: 58.1V to 64.3V range
Current - Peak Pulse (10/1000µs): 6.9A to 9.8A range
Power - Peak Pulse: 400W to 500W range
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on clamping voltage performance: standard clamping (58.1V) and enhanced clamping (64.3V). All identified substitutes maintain the 36V standoff voltage specification and DO-214AC package footprint, ensuring mechanical and electrical compatibility.

Parameter Comparison

Manufacturer 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	Inventory (Pcs)
SMAJ36	Littelfuse Inc.	36	61.01	6.9	400	-65 to 150	Obsolete	822
SMAJ36A	MDD	36	58.1	6.9	400	-50 to 150	Active	7870
SZ1SMA36AT3G	Littelfuse Inc.	36	58.1	6.9	400	-65 to 150	Active	9042
SMAJ36A-13-F	Diodes Incorporated	36	58.1	6.9	400	-55 to 150	Active	15200
SMAJ36A-TP	Micro Commercial Co	36	58.1	6.9	400	-55 to 175	Active	4554
SMAJ36AE3/TR13	Microchip Technology	36	58.1	8.6	500	-65 to 150	Active	832
SMAJ36E3/TR13	Microchip Technology	36	64.3	9.8	500	-65 to 150	Active	1024
TV04A360J-G	Comchip Technology	36	58.1	6.88	400	-55 to 150	Active	962

Engineering Selection Recommendations

Direct Replacement (Preferred): SZ1SMA36AT3G (Littelfuse Inc.) is the primary recommended substitute. This part maintains the original manufacturer lineage, preserves the full operating temperature range (-65°C to 150°C), and is currently in active production status with substantial inventory availability (9042 units). It carries AEC-Q101 automotive qualification and REACH compliance, ensuring suitability for regulated applications.

Standard Clamping Alternatives (58.1V): SMAJ36A-13-F (Diodes Incorporated), SMAJ36A-TP (Micro Commercial Co), SMAJ36A (MDD), and TV04A360J-G (Comchip Technology) all provide equivalent electrical performance with 58.1V clamping voltage and 6.9A peak pulse current. These parts are active and widely available. Selection among these options depends on supply chain requirements and temperature range specifications. SMAJ36A-TP offers the extended upper temperature limit (-55°C to 175°C), beneficial for high-temperature applications.

Enhanced Performance Alternative (64.3V Clamping): SMAJ36E3/TR13 (Microchip Technology) provides higher clamping voltage (64.3V) and increased peak pulse current (9.8A) with 500W power rating. This part is suitable for applications requiring enhanced transient suppression capability and maintains the full -65°C to 150°C operating range.

Higher Current Capability: SMAJ36AE3/TR13 (Microchip Technology) offers intermediate performance with 58.1V clamping, 8.6A peak pulse current, and 500W power rating, providing a middle ground between standard and enhanced performance options.

All recommended substitutes maintain ROHS3 compliance and DO-214AC (SMA) package compatibility, ensuring direct PCB footprint compatibility with the original SMAJ36 design.

Frequently Asked Questions (FAQ)

Q: Can SMAJ36 substitutes be used interchangeably on existing PCBs? A: Yes, all identified substitutes use the DO-214AC (SMA) package with identical footprint dimensions. Direct board-level substitution is mechanically feasible. However, electrical performance differences must be evaluated against circuit requirements, particularly clamping voltage and peak pulse current ratings.

Q: What is the difference between 58.1V and 64.3V clamping voltage options? A: Clamping voltage determines the maximum voltage the TVS diode allows across its terminals during transient suppression. The 58.1V clamping variants (SMAJ36A series, TV04A360J-G) provide standard protection, while the 64.3V variant (SMAJ36E3/TR13) allows higher voltage transients to pass through before clamping. Selection depends on downstream component voltage ratings and transient energy specifications.

Q: Are there temperature range limitations when substituting? A: The original SMAJ36 operates from -65°C to 150°C (TJ). Most substitutes maintain this range or exceed it. SMAJ36A (MDD) operates only to -50°C, which may be restrictive for military or aerospace applications. SMAJ36A-TP extends to 175°C, suitable for high-temperature environments. Verify application temperature requirements before selection.

Q: What is the significance of the "A" designation in part numbers like SMAJ36A? A: The "A" suffix typically indicates a specific manufacturing revision or performance grade within a product family. All SMAJ36A variants maintain the core 36V standoff specification and DO-214AC package, but may differ in clamping voltage, current rating, or temperature range. Consult manufacturer datasheets for revision-specific details.

Q: Can SMAJ36AE3/TR13 or SMAJ36E3/TR13 be used as drop-in replacements? A: These Microchip variants are electrically compatible but offer enhanced performance (higher current and power ratings). They can replace SMAJ36 in applications where the circuit can tolerate higher clamping voltages and peak currents. However, if the original design relies on specific clamping voltage characteristics, performance differences must be validated through circuit simulation or testing.

Q: Which substitute offers the best long-term availability? A: SMAJ36A-13-F (Diodes Incorporated) shows the highest inventory level (15,200 units) and is from an established semiconductor manufacturer with broad distribution. SZ1SMA36AT3G (Littelfuse Inc.) maintains the original manufacturer relationship with substantial inventory (9,042 units) and automotive qualification, making it suitable for regulated supply chains.

Q: Are all substitutes RoHS3 compliant? A: Yes, all identified substitutes carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for commercial and industrial applications.

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