SMAJ110 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ110 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 110V reverse standoff voltage with a 185.85V maximum clamping voltage and 2.3A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ110 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	110	V
Voltage - Breakdown (Min)	115.65	V
Voltage - Clamping (Max) @ Ipp	185.85	V
Current - Peak Pulse (10/1000µs)	2.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ110 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 110V
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)
RoHS3 Compliance
MSL Rating: 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 185.85V ±10% tolerance range acceptable
Current - Peak Pulse (10/1000µs): 2.3A minimum
Power - Peak Pulse: 400W minimum
Operating Temperature: -55°C to 150°C minimum range

Substitute parts are grouped into two categories based on clamping voltage alignment:

Group A (177V Clamping): SMAJ110A (Meritek), SMAJ110A-13-F (Diodes Incorporated), SMAJ110A-TP (Micro Commercial Co), TV04A111J-G (Comchip Technology), SMAJ110AE3/TR13 (Microchip Technology)

Group B (196V Clamping): SMAJ110E3/TR13 (Microchip Technology)

Group C (193V Clamping, Higher Standoff): SMAJ120A-13-F (Diodes Incorporated) — 120V standoff voltage, limited compatibility

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Temp Range (°C)	Product Status
SMAJ110	Littelfuse Inc.	110	115.65	185.85	2.3	400	-65 to 150	Obsolete
SMAJ110A	Meritek	110	122	177	2.26	400	-55 to 150	Active
SMAJ110A-13-F	Diodes Incorporated	110	122	177	2.3	400	-55 to 150	Active
SMAJ110A-TP	Micro Commercial Co	110	122	177	2.3	400	-55 to 175	Active
SMAJ110AE3/TR13	Microchip Technology	110	122	177	2.8	500	-65 to 150	Active
SMAJ110E3/TR13	Microchip Technology	110	122	196	2.6	500	-65 to 150	Active
TV04A111J-G	Comchip Technology	110	122	177	2.26	400	-55 to 150	Active
SMAJ120A-13-F	Diodes Incorporated	120	133	193	2	400	-55 to 150	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

SMAJ110A-13-F (Diodes Incorporated) and SMAJ110A-TP (Micro Commercial Co) are the preferred direct substitutes. Both maintain the 110V standoff voltage, 177V clamping voltage, and 2.3A peak pulse current. Both are ROHS3 compliant, MSL 1 rated, and in active production status with high inventory availability (35,400 and 15,718 units respectively). SMAJ110A-TP offers extended operating temperature to 175°C.

SMAJ110AE3/TR13 (Microchip Technology) provides enhanced performance with 2.8A peak pulse current and 500W peak pulse power while maintaining 110V standoff and 177V clamping. This part is suitable for applications requiring higher transient energy absorption. Operating temperature range matches the original SMAJ110 (-65°C to 150°C).

Secondary Substitutes (Conditional):

SMAJ110A (Meritek) and TV04A111J-G (Comchip Technology) are functionally equivalent with 177V clamping and 2.26A peak pulse current. Both are active and ROHS3 compliant. Lower inventory levels (2,300 and 1,098 units) may affect procurement timelines.

SMAJ110E3/TR13 (Microchip Technology) features higher clamping voltage (196V) and 2.6A peak pulse current with 500W power rating. This part is suitable only for applications where higher clamping voltage is acceptable or beneficial.

Limited Compatibility:

SMAJ120A-13-F (Diodes Incorporated) has a 120V standoff voltage and 193V clamping voltage, deviating from the 110V specification. This part is suitable only for applications where the higher standoff voltage does not compromise circuit protection requirements. Automotive grade certification is available.

Frequently Asked Questions (FAQ)

Q: Can SMAJ110A-13-F directly replace SMAJ110 in existing designs?

A: Yes. SMAJ110A-13-F maintains identical standoff voltage (110V), equivalent clamping voltage (177V vs 185.85V), matching peak pulse current (2.3A), and identical package (DO-214AC SMA). Both are ROHS3 compliant and MSL 1 rated. The part is in active production with high inventory availability.

Q: What is the difference between the 177V and 196V clamping variants?

A: SMAJ110AE3/TR13 and SMAJ110E3/TR13 both maintain 110V standoff voltage but differ in clamping voltage. The 177V variant (SMAJ110AE3/TR13) provides closer alignment to the original SMAJ110 specification. The 196V variant (SMAJ110E3/TR13) offers higher clamping voltage, suitable for applications requiring additional margin or where circuit topology permits higher transient voltages.

Q: Is SMAJ120A-13-F a suitable substitute?

A: SMAJ120A-13-F is not a direct substitute due to its 120V standoff voltage versus the required 110V. This part is suitable only for new designs where the higher standoff voltage is acceptable. Existing designs using SMAJ110 should not use SMAJ120A-13-F without circuit re-evaluation.

Q: What are the packaging and moisture sensitivity considerations?

A: All substitute parts use DO-214AC (SMA) surface-mount packaging, identical to SMAJ110. All are MSL 1 rated (unlimited moisture sensitivity level), requiring no special handling or baking procedures. Tape & Reel (TR) packaging is standard across all active substitutes.

Q: Which substitute offers the best thermal performance?

A: SMAJ110A-TP (Micro Commercial Co) extends the operating temperature range to 175°C (versus 150°C for most alternatives), providing superior thermal margin. SMAJ110AE3/TR13 and SMAJ110E3/TR13 (Microchip Technology) maintain the original -65°C lower temperature limit, matching SMAJ110 specifications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message