1SMA9.0AT3 Equivalent & Substitute Parts

Part Overview

The 1SMA9.0AT3 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by onsemi, rated for 9V reverse standoff with 15.4V maximum clamping voltage and 26A peak pulse current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is housed in a DO-214AC (SMA) surface mount package and is suitable for general-purpose transient voltage suppression applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	9	V
Voltage - Breakdown (Min)	10	V
Voltage - Clamping (Max) @ Ipp	15.4	V
Current - Peak Pulse (10/1000µs)	26	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	—
Operating Temperature	-65 to 150	°C (TJ)
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMA9.0AT3 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical Specifications): Parts that match all critical electrical parameters: 9V reverse standoff, 10V minimum breakdown voltage, 15.4V maximum clamping voltage, and 26A peak pulse current. These parts maintain the same functional performance and are interchangeable in circuit applications. Package compatibility (DO-214AC/SMA) is maintained.

Similar Substitutes (Comparable Electrical Performance): Parts that share the same 9V reverse standoff and 15.4V clamping voltage but differ in peak pulse current capability, clamping voltage tolerance, or package form factor. These parts are suitable for applications where the specific current rating or package variant does not create a functional limitation. The PTVS10VS1UR,115 operates at 10V standoff and is included due to its proximity in voltage rating and automotive qualification.

Parameter Comparison

Part Number	Manufacturer	Vr (Typ) [V]	Vbr (Min) [V]	Vc (Max) [V]	Ipp [A]	Ppk [W]	Package	Status	RoHS
1SMA9.0AT3	onsemi	9	10	15.4	26	400	DO-214AC, SMA	Obsolete	Non-compliant
SMAJ9.0A	MDD	9	10	15.4	26	400	DO-214AC, SMA	Active	ROHS3
SMA6L9.0A	Littelfuse Inc.	9	10	15.4	39	600	DO-221AC, SMA Flat Leads	Active	ROHS3
SMAJ9.0A-13-F	Diodes Incorporated	9	10	15.4	26	400	DO-214AC, SMA	Active	ROHS3
SMAJ9.0A-TP	Micro Commercial Co	9	10	15.4	26	400	DO-214AC, SMA	Active	ROHS3
SMAJ9.0AE3/TR13	Microchip Technology	9	10	15.4	32.6	500	DO-214AC, SMA	Active	ROHS3
SMAJ9.0E3/TR13	Microchip Technology	9	10	16.9	29.5	500	DO-214AC, SMA	Active	ROHS3
TV04A9V0J-G	Comchip Technology	9	10	15.4	25.97	400	DO-214AC, SMA	Active	ROHS3
TV04A9V0J-HF	Comchip Technology	9	10	15.4	25.97	400	DO-214AC, SMA	Active	ROHS3
PTVS10VS1UR,115	Nexperia USA Inc.	10	11.1	17	24.6	400	SOD-123W	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

SMAJ9.0A (MDD), SMAJ9.0A-13-F (Diodes Incorporated), and SMAJ9.0A-TP (Micro Commercial Co) are functionally identical to the 1SMA9.0AT3 across all critical electrical parameters. All three are active products with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance status of the original part. These options provide the highest compatibility with existing circuit designs.

Enhanced Performance Alternatives:

SMAJ9.0AE3/TR13 (Microchip Technology) and SMAJ9.0E3/TR13 (Microchip Technology) offer increased peak pulse current capability (32.6A and 29.5A respectively) and higher peak pulse power (500W), providing additional margin for transient suppression. These parts maintain the 9V standoff voltage and are suitable for applications requiring enhanced surge handling.

SMA6L9.0A (Littelfuse Inc.) provides the highest peak pulse current rating (39A) and power dissipation (600W) while maintaining 9V standoff and 15.4V clamping voltage. The DO-221AC package with flat leads offers improved thermal performance. This part is appropriate for high-energy transient environments.

Voltage-Shifted Alternative:

PTVS10VS1UR,115 (Nexperia USA Inc.) operates at 10V reverse standoff with 17V clamping voltage and includes AEC-Q101 automotive qualification. This part is suitable only for applications where the higher voltage rating does not conflict with circuit requirements and automotive-grade reliability is beneficial.

Compliance Consideration:

All recommended substitutes are ROHS3 compliant, resolving the non-compliance status of the obsolete 1SMA9.0AT3.

Frequently Asked Questions (FAQ)

Q: Can SMAJ9.0A directly replace 1SMA9.0AT3 in existing designs?

A: Yes. SMAJ9.0A matches all electrical specifications (9V standoff, 15.4V clamping, 26A peak pulse) and package form factor (DO-214AC/SMA). No circuit modifications are required.

Q: What is the difference between SMAJ9.0AE3/TR13 and SMAJ9.0E3/TR13?

A: Both are Microchip products with identical 9V standoff voltage. SMAJ9.0AE3/TR13 provides 32.6A peak pulse current and 500W power dissipation. SMAJ9.0E3/TR13 provides 29.5A peak pulse current with 16.9V clamping voltage (versus 15.4V) and 500W power dissipation. Selection depends on whether the higher clamping voltage is acceptable for the application.

Q: Is SMA6L9.0A compatible with the original DO-214AC footprint?

A: SMA6L9.0A uses the DO-221AC package with flat leads, which differs from the standard DO-214AC package. Verify PCB footprint compatibility before selection. The electrical performance is superior, but physical layout changes may be required.

Q: When should PTVS10VS1UR,115 be considered?

A: This part is suitable only when the application circuit can tolerate 10V standoff and 17V clamping voltage instead of 9V and 15.4V respectively. The automotive qualification (AEC-Q101) makes it appropriate for automotive applications. The SOD-123W package requires footprint verification.

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

A: Most substitutes use DO-214AC (SMA) packaging. SMA6L9.0A uses DO-221AC with flat leads, and PTVS10VS1UR,115 uses SOD-123W. Verify package compatibility with your PCB design before final selection.

Q: What inventory considerations apply to these substitutes?

A: SMAJ9.0A-13-F (Diodes Incorporated) has the highest inventory availability at 30,300 pieces. SMAJ9.0A (MDD) offers 6,612 pieces. Microchip variants (SMAJ9.0AE3/TR13 and SMAJ9.0E3/TR13) have lower availability at 783 and 1,008 pieces respectively. Confirm supply chain availability for production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message