1SMB16AT3 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The 1SMB16AT3 is a unidirectional Zener-type transient voltage suppressor manufactured by onsemi in DO-214AA (SMB) surface mount package. This component is designed for general-purpose overvoltage protection applications with a 16V reverse standoff voltage and 26V maximum clamping voltage at peak pulse current of 23.1A.

The 1SMB16AT3 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	16	V
Voltage - Breakdown (Min)	17.8	V
Voltage - Clamping (Max) @ Ipp	26	V
Current - Peak Pulse (10/1000µs)	23.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB16AT3 is determined by the following criteria:

Electrical Parameters (Critical):

Voltage - Reverse Standoff (Typ): 16V
Voltage - Breakdown (Min): 17.8V
Voltage - Clamping (Max) @ Ipp: 26V
Current - Peak Pulse (10/1000µs): 23.1A
Power - Peak Pulse: 600W
Type: Zener
Unidirectional Channels: 1

Mechanical Parameters (Critical):

Mounting Type: Surface Mount
Package / Case: DO-214AA (SMB) or DO-214AC (SMA)

Environmental Parameters (Acceptable Variation):

Operating Temperature Range: Minimum -55°C to maximum 150°C or wider

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical & Mechanical): Parts with matching voltage ratings, current ratings, power dissipation, and SMB/SMA package compatibility.

Similar Substitutes (Matching Electrical, Package Variation or Status Consideration): Parts with identical electrical specifications but different package designations (SOD-128) or discontinued status requiring engineering evaluation.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	PPP (W)	Package	Temp Range (°C)	Product Status	RoHS
1SMB16AT3	onsemi	16	17.8	26	23.1	600	DO-214AA (SMB)	-65 to 150	Obsolete	Non-compliant
SMBJ16A	EVVO Semi	16	17.8	26	23.1	600	DO-214AC (SMA)	-65 to 150	Active	ROHS3 Compliant
SMBJ16A-13	Diodes Incorporated	16	17.8	26	23.1	600	DO-214AA (SMB)	-55 to 150	Discontinued at DiGi Electronics	Non-compliant
SMBJ16A-13-F	Diodes Incorporated	16	17.8	26	23.1	600	DO-214AA (SMB)	-55 to 150	Active	ROHS3 Compliant
SMBJ16A-HR	Littelfuse Inc.	16	17.8	26	23.1	600	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
SMBJ16A-HRA	Littelfuse Inc.	16	17.8	26	23.1	600	DO-214AA (SMB)	-65 to 150	Active	ROHS3 Compliant
SMBJ16A-TP	Micro Commercial Co	16	17.8	26	23.1	600	DO-214AA (SMB)	-55 to 175	Active	ROHS3 Compliant
SMBJ16A-TR	STMicroelectronics	16	17.8	26	23.1	600	DO-214AA (SMB)	-55 to 150	Active	ROHS3 Compliant
PTVS16VP1UP,115	Nexperia USA Inc.	16	17.8	26	23.1	600	SOD-128	-55 to 150	Discontinued at DiGi Electronics	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Substitutes (Active Status, ROHS3 Compliant, SMB Package):

SMBJ16A-13-F (Diodes Incorporated), SMBJ16A-HR (Littelfuse Inc.), SMBJ16A-HRA (Littelfuse Inc.), SMBJ16A-TP (Micro Commercial Co), and SMBJ16A-TR (STMicroelectronics) are all active production parts with ROHS3 compliance and identical electrical specifications. These parts maintain the DO-214AA (SMB) package footprint compatible with the original 1SMB16AT3 design.

SMBJ16A-TP offers the widest operating temperature range (-55°C to 175°C), providing additional thermal margin for applications requiring extended temperature performance.

Alternative with Package Consideration:

SMBJ16A (EVVO Semi) is an active production part with ROHS3 compliance and identical electrical specifications. This part uses the DO-214AC (SMA) package instead of SMB. PCB layout modification is required for footprint compatibility.

Discontinued Parts (Not Recommended for New Designs):

SMBJ16A-13 (Diodes Incorporated) and PTVS16VP1UP,115 (Nexperia USA Inc.) are discontinued at DiGi Electronics. PTVS16VP1UP,115 additionally requires SOD-128 package accommodation, incompatible with SMB footprints.

Frequently Asked Questions (FAQ)

Q: Can SMBJ16A (SMA package) be used as a direct replacement for 1SMB16AT3 (SMB package)?

A: SMBJ16A has identical electrical specifications but uses DO-214AC (SMA) package instead of DO-214AA (SMB). Physical footprint differs. PCB layout modification is required. Electrical performance is equivalent.

Q: What is the difference between SMB and SMA packages?

A: DO-214AA (SMB) and DO-214AC (SMA) are both surface mount diode packages with different physical dimensions. SMB is larger than SMA. Footprints are not interchangeable without PCB redesign.

Q: Are all substitute parts ROHS3 compliant?

A: No. The original 1SMB16AT3 is RoHS non-compliant. Active substitute parts (SMBJ16A-13-F, SMBJ16A-HR, SMBJ16A-HRA, SMBJ16A-TP, SMBJ16A-TR, SMBJ16A from EVVO Semi) are ROHS3 compliant. Compliance status should be verified against your application requirements.

Q: Which substitute part has the highest operating temperature rating?

A: SMBJ16A-TP (Micro Commercial Co) supports -55°C to 175°C, the widest range among all substitutes. The original 1SMB16AT3 supports -65°C to 150°C.

Q: Can I use PTVS16VP1UP,115 as a substitute?

A: PTVS16VP1UP,115 has matching electrical specifications but uses SOD-128 package, incompatible with SMB footprints. This part is also discontinued at DiGi Electronics. Not recommended for new designs.

Q: What are the key electrical parameters that must match for substitution?

A: Voltage - Reverse Standoff (16V), Voltage - Breakdown (17.8V minimum), Voltage - Clamping (26V maximum), Current - Peak Pulse (23.1A), and Power - Peak Pulse (600W) must all match. Unidirectional Zener type and single channel configuration are also required.

Q: Are there inventory considerations for substitute selection?

A: SMBJ16A (EVVO Semi) has the highest inventory (44,100 pcs). SMBJ16A-13-F (Diodes Incorporated) has 7,799 pcs. SMBJ16A-TP (Micro Commercial Co) has 2,387 pcs. Availability should be confirmed with your supplier.

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