1SMB90AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB90AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 90V reverse standoff voltage with 146V maximum clamping voltage and 4.1A peak pulse current capability in a DO-214AA (SMB) package. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	1SMB90AT3	—
Manufacturer	onsemi	—
Category	Transient Voltage Suppressors (TVS)	—
Voltage - Reverse Standoff (Typ)	90	V
Voltage - Breakdown (Min)	100	V
Voltage - Clamping (Max) @ Ipp	146	V
Current - Peak Pulse (10/1000µs)	4.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 1SMB90AT3 is determined by the following electrical and mechanical parameters:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 90V
Voltage - Clamping (Max) @ Ipp: 146V
Current - Peak Pulse (10/1000µs): 4.1A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature Range: -65°C to 150°C minimum

Substitute Categories:

Category 1: Direct Electrical & Mechanical Equivalents Parts matching all primary criteria with identical or superior electrical performance and active product status. These include SMBJ90A-13-F (Diodes Incorporated), SMBJ90AE3/TR13 (Microchip Technology), and SMBJ90A (MDD).

Category 2: Near-Equivalent with Acceptable Parameter Variance Parts with 90V reverse standoff voltage and 146V clamping voltage but minor variations in peak pulse current (4.1A to 4.6A range) or operating temperature range. These include SMBJ85CA-TR (STMicroelectronics) and SMBJ85CA-TP (Micro Commercial Co), which feature 85V reverse standoff and 137V clamping voltage—lower than the original but within acceptable tolerance for many applications.

Category 3: Functional Alternatives with Different Voltage Ratings The 1SMB5954BT3G (onsemi) is a Zener diode with 160V rating and 3W power dissipation, suitable only for applications requiring higher voltage suppression.

Parameter Comparison

Parameter	1SMB90AT3 (Main)	SMBJ90A-13-F	SMBJ90AE3/TR13	SMBJ90A (MDD)	SMBJ85CA-TR	SMBJ85CA-TP
Manufacturer	onsemi	Diodes Inc.	Microchip	MDD	STMicroelectronics	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	90V	90V	90V	90V	85V	85V
Voltage - Breakdown (Min)	100V	100V	100V	100V	94V	94.4V
Voltage - Clamping (Max) @ Ipp	146V	146V	146V	146V	137V	137V
Current - Peak Pulse (10/1000µs)	4.1A	4.1A	4.1A	4.1A	4.6A	4.4A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-65 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SMBJ90A-13-F (Diodes Incorporated) This part provides exact electrical equivalence to the 1SMB90AT3 with identical voltage ratings (90V standoff, 146V clamping) and peak pulse current (4.1A). The component is in active production status with ROHS3 compliance, addressing both obsolescence and regulatory requirements. Operating temperature range of -55°C to 150°C covers the original specification minimum of -65°C; applications requiring -65°C operation should evaluate SMBJ90AE3/TR13 as an alternative.

Secondary Recommendation: SMBJ90AE3/TR13 (Microchip Technology) This part matches all electrical parameters of the 1SMB90AT3 and extends the lower operating temperature limit to -65°C, matching the original specification exactly. Active product status and ROHS3 compliance make this suitable for designs with extended temperature requirements.

Tertiary Recommendation: SMBJ90A (MDD) Provides electrical equivalence with identical voltage and current ratings. Operating temperature range of -50°C to 150°C is narrower than the original; this part is suitable for applications not requiring the full -65°C lower limit. ROHS3 compliance and active status support long-term availability.

Alternative for Lower Voltage Applications: SMBJ85CA-TR or SMBJ85CA-TP These parts feature reduced voltage ratings (85V standoff, 137V clamping) compared to the original 1SMB90AT3. Selection is appropriate only for applications where the lower voltage suppression threshold is acceptable. Both are active, ROHS3-compliant products with adequate peak pulse current (4.4A to 4.6A).

Frequently Asked Questions (FAQ)

Q: Can SMBJ85CA-TR or SMBJ85CA-TP be used as direct replacements for 1SMB90AT3? A: These parts are not direct replacements. They feature 85V reverse standoff and 137V clamping voltage compared to the original 90V and 146V specifications. Use only if your application circuit tolerates the lower voltage suppression threshold. The reduced clamping voltage may result in higher transient voltages reaching downstream components.

Q: What is the difference between SMBJ90A-13-F and SMBJ90AE3/TR13? A: Both provide identical electrical performance (90V standoff, 146V clamping, 4.1A peak pulse). The primary difference is operating temperature range: SMBJ90A-13-F operates from -55°C to 150°C, while SMBJ90AE3/TR13 extends to -65°C. Select SMBJ90AE3/TR13 if your application requires the full -65°C lower temperature limit.

Q: Are all substitute parts available in the same SMB package? A: Yes. All recommended substitutes use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original 1SMB90AT3 design.

Q: Does the 1SMB5954BT3G qualify as a substitute? A: No. The 1SMB5954BT3G is a Zener diode with 160V rating and 3W power dissipation, fundamentally different from the TVS diode category and electrical specifications of the 1SMB90AT3. This part is suitable only for applications requiring higher voltage suppression and is not interchangeable.

Q: Why is RoHS compliance important for this substitution? A: The original 1SMB90AT3 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory standards for new designs and procurement. This compliance status is mandatory for many OEM supply chains and end-market applications.

Q: Can I use SMBJ90A (MDD) in applications requiring -65°C operation? A: No. SMBJ90A (MDD) specifies a minimum operating temperature of -50°C. For applications requiring -65°C operation, use SMBJ90AE3/TR13 (Microchip Technology) or SMBJ90A-13-F if -55°C is acceptable.

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