SMAJ30A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ30A-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 30V reverse standoff voltage with a 48.4V maximum clamping voltage and 8.3A peak pulse current capability in a DO-214AC (SMA) package. This part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	8.3	A
Power - Peak Pulse	400	W
Type	Zener	—
Unidirectional Channels	1	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55°C ~ 150°C	TJ
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ30A-13 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 30V (nominal)
Voltage - Breakdown (Min): 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V
Current - Peak Pulse (10/1000µs): 8.3A minimum
Power - Peak Pulse: 400W minimum
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Mechanical Equivalents: Parts meeting all critical parameters with identical or superior electrical performance and the same DO-214AC (SMA) package footprint.

Category B - Functional Equivalents with Package Variation: Parts meeting all critical electrical parameters but utilizing alternative surface-mount packages (SOD-123W) that require PCB layout modification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	RoHS Status
SMAJ30A-13	Diodes Incorporated	30	33.3	48.4	8.3	400	DO-214AC, SMA	Discontinued	Non-compliant
SMAJ30A-13-F	Diodes Incorporated	30	33.3	48.4	8.3	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ30A	MDD	30	33.3	48.4	8.3	400	DO-214AC, SMA	Active	ROHS3 Compliant
PTVS30VS1UR,115	Nexperia USA Inc.	30	33.3	48.4	8.3	400	SOD-123W	Active	ROHS3 Compliant
SM4T35AY	STMicroelectronics	30	33.3	64.3	36	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ30A-TP	Micro Commercial Co	30	33.3	48.4	8.3	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ30A-TR	STMicroelectronics	30	33.3	64.3	36	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ30AE3/TR13	Microchip Technology	30	33.3	48.4	10.3	500	DO-214AC, SMA	Active	ROHS3 Compliant
SZ1SMA30AT3G	Littelfuse Inc.	30	33.3	48.4	8.3	400	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - No Layout Changes Required):

SMAJ30A-13-F (Diodes Incorporated) is the direct successor to SMAJ30A-13, offering identical electrical specifications with active product status and ROHS3 compliance. This part provides the most straightforward replacement path with no design modifications necessary.

SMAJ30A (MDD) and SMAJ30A-TP (Micro Commercial Co) provide equivalent electrical performance in the same DO-214AC (SMA) package with active status and full RoHS compliance. Both are suitable for direct substitution.

SZ1SMA30AT3G (Littelfuse Inc.) meets all electrical requirements with identical clamping voltage and peak pulse current. This part includes AEC-Q101 automotive qualification and carries a capacitance specification of 405pF @ 1MHz, providing additional design data for high-frequency applications.

Secondary Substitutes (Enhanced Performance - Same Package):

SMAJ30AE3/TR13 (Microchip Technology) exceeds the original specification with 10.3A peak pulse current and 500W peak pulse power, providing design margin while maintaining the same package footprint and voltage characteristics. This part is suitable for applications requiring enhanced transient protection capability.

SM4T35AY (STMicroelectronics) and SMAJ30A-TR (STMicroelectronics) both feature elevated clamping voltage (64.3V) and significantly higher peak pulse current (36A at 8/20µs), representing enhanced protection devices. These parts are suitable only where the higher clamping voltage is acceptable within the circuit design.

Alternative Package Substitute (Layout Modification Required):

PTVS30VS1UR,115 (Nexperia USA Inc.) provides electrical equivalence but utilizes the SOD-123W package instead of DO-214AC (SMA). This substitution requires PCB layout modification and is recommended only when DO-214AC alternatives are unavailable. The part includes AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30A-13-F be used as a direct replacement for SMAJ30A-13?

A: Yes. SMAJ30A-13-F is electrically and mechanically identical to SMAJ30A-13, with the same voltage ratings, current handling, and DO-214AC (SMA) package. No design changes are required. The primary difference is product status (active vs. discontinued) and RoHS compliance level.

Q: What is the difference between parts with 48.4V clamping voltage and those with 64.3V?

A: The 48.4V clamping voltage parts (SMAJ30A-13, SMAJ30A-13-F, SMAJ30A, SMAJ30A-TP, SMAJ30AE3/TR13, SZ1SMA30AT3G) clamp transient overvoltages to a lower level, providing tighter protection. The 64.3V clamping voltage parts (SM4T35AY, SMAJ30A-TR) allow higher voltage transients before clamping, suitable for applications with higher transient tolerance. Selection depends on the protected circuit's voltage withstand capability.

Q: Can SM4T35AY or SMAJ30A-TR be used instead of SMAJ30A-13?

A: These parts share the same 30V reverse standoff voltage and DO-214AC (SMA) package, but feature higher clamping voltage (64.3V) and significantly higher peak pulse current (36A). They are suitable only if the circuit design permits the higher clamping voltage. Verify that downstream components can withstand 64.3V transient peaks before substitution.

Q: What does ROHS3 compliance mean for this part?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original SMAJ30A-13 is non-compliant; all active substitutes are ROHS3 compliant, making them suitable for applications with environmental or regulatory requirements.

Q: Can PTVS30VS1UR,115 be used if DO-214AC parts are unavailable?

A: PTVS30VS1UR,115 provides electrical equivalence but uses the SOD-123W package instead of DO-214AC (SMA). Substitution requires PCB layout modification to accommodate the different footprint. This option is viable only when design schedule permits layout changes and DO-214AC alternatives are genuinely unavailable.

Q: What is the significance of AEC-Q101 qualification on certain parts?

A: AEC-Q101 qualification indicates the part meets automotive-grade reliability standards established by the Automotive Electronics Council. Parts with this qualification (SZ1SMA30AT3G, PTVS30VS1UR,115, SM4T35AY, SMAJ30A-TR) are suitable for automotive and high-reliability applications requiring enhanced quality assurance and testing documentation.

Q: Does SMAJ30AE3/TR13 provide better protection than SMAJ30A-13?

A: SMAJ30AE3/TR13 maintains identical voltage characteristics (30V standoff, 48.4V clamping) but provides higher peak pulse current (10.3A vs. 8.3A) and power dissipation (500W vs. 400W). This represents enhanced transient handling capability within the same voltage protection window, suitable for applications experiencing higher-energy transient events.

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

A: Most substitutes are available in Cut Tape (CT) and Digi-Reel or Tape & Reel (TR) packaging. Verify specific packaging availability with your supplier, as packaging options may vary by manufacturer and distributor. The DO-214AC (SMA) package footprint remains consistent across all primary substitutes except PTVS30VS1UR,115.

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