1SMA16AT3 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 1SMA16AT3 is a 400W unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi in SMA packaging. This component is designed for clamping transient overvoltage events in electronic circuits. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation ratings while accommodating packaging and compliance variations.

Key Parameters

Parameter	1SMA16AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	16V
Power - Peak Pulse	400W
Mounting Type	Surface Mount
Package / Case	SMA (DO-214AC)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMA16AT3 is determined by the following critical parameters:

Reverse Standoff Voltage (Typ): 16V nominal
Power - Peak Pulse: 400W minimum
Unidirectional Configuration: Single channel
Mounting Type: Surface Mount
Package Compatibility: SMA (DO-214AC) or equivalent form factor

Substitute parts are grouped into two categories based on package type: SMA-packaged devices (SMAJ16A, SMAJ16A-TP) and alternative surface-mount packages (PTVS16VS1UR,115 in SOD-123W). The SMAJ15A-TR variant is included due to its 16V standoff voltage proximity and 400W power rating, though it exhibits different clamping and current characteristics.

Parameter Comparison

Parameter	1SMA16AT3	SMAJ16A	PTVS16VS1UR,115	SMAJ15A-TR	SMAJ16A-TP
Manufacturer	onsemi	EVVO Semi	Nexperia USA Inc.	STMicroelectronics	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	16V	16V	16V	15V	16V
Voltage - Breakdown (Min)	—	17.8V	17.8V	16.7V	17.8V
Voltage - Clamping (Max) @ Ipp	—	26V	26V	32.5V	26V
Current - Peak Pulse (10/1000µs)	—	15.4A	15.4A	71A (8/20µs)	15.3A
Power - Peak Pulse	400W	400W	400W	400W	400W
Package / Case	SMA (DO-214AC)	SMA (DO-214AC)	SOD-123W	SMA (DO-214AC)	DO-214AC (SMA)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	—	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TA)	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TA)
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SMAJ16A (EVVO Semi) and SMAJ16A-TP (Micro Commercial Co) are direct electrical equivalents with identical 16V reverse standoff voltage, 26V clamping voltage, and 400W power rating in SMA packaging. Both are active products with ROHS3 compliance. SMAJ16A-TP offers extended operating temperature range to 175°C, providing thermal margin advantage in high-temperature applications.

Alternative Package Option:

PTVS16VS1UR,115 (Nexperia USA Inc.) maintains identical electrical specifications (16V standoff, 26V clamp, 400W power) but uses SOD-123W packaging. This part includes AEC-Q101 automotive qualification and is suitable for applications requiring smaller form factor or automotive-grade certification. Package change requires PCB layout modification.

Secondary Substitute (Voltage Tolerance Consideration):

SMAJ15A-TR (STMicroelectronics) operates at 15V reverse standoff voltage with higher peak pulse current (71A at 8/20µs) and elevated clamping voltage (32.5V). This part is suitable only when circuit design tolerates ±1V standoff voltage deviation and higher clamping voltage. SMA packaging maintains footprint compatibility.

All substitute parts carry ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete 1SMA16AT3.

Frequently Asked Questions (FAQ)

Q: Can SMAJ16A directly replace 1SMA16AT3 without PCB modification?

A: Yes. SMAJ16A maintains identical SMA (DO-214AC) packaging, 16V reverse standoff voltage, 26V clamping voltage, and 400W power rating. No PCB layout changes are required.

Q: What is the difference between SMAJ16A and SMAJ16A-TP?

A: Both parts are electrically identical with 16V standoff and 26V clamping specifications. SMAJ16A-TP extends operating temperature range to 175°C (versus 150°C for SMAJ16A), providing thermal headroom in high-temperature environments. Packaging and electrical performance are equivalent.

Q: Why is PTVS16VS1UR,115 listed as a substitute if it uses different packaging?

A: PTVS16VS1UR,115 maintains all critical electrical parameters (16V standoff, 26V clamp, 400W power, 15.4A peak pulse current) and MSL rating. SOD-123W packaging is smaller than SMA but requires PCB redesign. This option is suitable for space-constrained designs or automotive applications requiring AEC-Q101 qualification.

Q: Can SMAJ15A-TR be used as a direct replacement?

A: SMAJ15A-TR is a functional substitute with 15V reverse standoff voltage (1V lower than 1SMA16AT3) and higher clamping voltage (32.5V versus 26V). Use this part only when circuit design specifications permit ±1V standoff tolerance and higher clamping voltage. Peak pulse current is significantly higher (71A), which may affect circuit behavior during transient events.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes carry ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete 1SMA16AT3. This is mandatory for new designs in regulated markets.

Q: What is the inventory status of substitute parts?

A: SMAJ16A (10,200 pcs), PTVS16VS1UR,115 (18,660 pcs), SMAJ15A-TR (74,075 pcs), and SMAJ16A-TP (9,647 pcs) are all in active stock as new original components.

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