SMAJ440 Equivalent & Substitute Parts

Part Overview

The SMAJ440 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 440V reverse standoff voltage rating and 748.65V maximum clamping voltage with 600mA peak pulse current capability in a DO-214AC (SMA) package. The SMAJ440 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	440	V
Voltage - Breakdown (Min)	465.75	V
Voltage - Clamping (Max) @ Ipp	748.65	V
Current - Peak Pulse (10/1000µs)	600	mA
Power - Peak Pulse	400	W
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

Substitute parts for the SMAJ440 are qualified based on the following critical parameters that must align with the original component:

Voltage - Reverse Standoff (Typ): 440V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener, Unidirectional
Power - Peak Pulse: 400W
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

The substitute parts listed below maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit protection applications. Variations in clamping voltage and peak pulse current within the specified ranges do not affect substitutability for general-purpose transient voltage suppression.

Parameter Comparison

Parameter	SMAJ440 (Littelfuse)	SMAJ440A (SMC Diode)	SMAJ440A-TP (Micro Commercial)	TV04A441J-HF (Comchip)
Voltage - Reverse Standoff (Typ)	440V	440V	440V	440V
Voltage - Breakdown (Min)	465.75V	-	492V	492V
Voltage - Clamping (Max) @ Ipp	748.65V	-	713V	713V
Current - Peak Pulse (10/1000µs)	600mA	-	600mA	560mA
Power - Peak Pulse	400W	400W	400W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
Operating Temperature	-65°C ~ 150°C (TJ)	-	-55°C ~ 175°C (TA)	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active
Packaging Option	-	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

All three substitute parts—SMAJ440A (SMC Diode Solutions), SMAJ440A-TP (Micro Commercial Co), and TV04A441J-HF (Comchip Technology)—are active products with ROHS3 compliance and MSL 1 ratings, making them suitable replacements for the obsolete SMAJ440.

SMAJ440A from SMC Diode Solutions offers the highest inventory availability (6,475 pcs) and is available in both Cut Tape and Digi-Reel packaging formats, providing flexibility for different procurement and assembly workflows.

SMAJ440A-TP from Micro Commercial Co provides the widest operating temperature range (-55°C to 175°C) and maintains the original 600mA peak pulse current specification. This part is available in Tape & Reel packaging with substantial inventory (10,988 pcs).

TV04A441J-HF from Comchip Technology operates within the -55°C to 150°C temperature range with a slightly reduced peak pulse current of 560mA. This part is available in Tape & Reel packaging with 782 pcs in stock.

All substitute parts maintain the critical 440V reverse standoff voltage, 400W peak pulse power rating, DO-214AC (SMA) package, and surface-mount configuration required for direct circuit replacement.

Frequently Asked Questions (FAQ)

Q: Can SMAJ440A from SMC Diode Solutions be used as a direct replacement for the obsolete SMAJ440?

A: Yes. Both parts share the same 440V reverse standoff voltage, 400W peak pulse power rating, DO-214AC (SMA) package, and surface-mount configuration. SMAJ440A is an active product with ROHS3 compliance and MSL 1 rating, making it functionally equivalent for general-purpose transient voltage suppression applications.

Q: What is the difference between SMAJ440A-TP and TV04A441J-HF?

A: Both parts maintain the 440V reverse standoff voltage and 400W power rating in DO-214AC (SMA) packages. SMAJ440A-TP supports 600mA peak pulse current with an operating temperature range of -55°C to 175°C. TV04A441J-HF supports 560mA peak pulse current with an operating temperature range of -55°C to 150°C. Selection depends on specific circuit current requirements and thermal operating conditions.

Q: Are all substitute parts RoHS compliant?

A: Yes. SMAJ440A, SMAJ440A-TP, and TV04A441J-HF are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting environmental and reliability standards for industrial and commercial applications.

Q: What packaging options are available for these substitute parts?

A: SMAJ440A is available in Cut Tape (CT) and Digi-Reel® formats. SMAJ440A-TP and TV04A441J-HF are available in Tape & Reel (TR) packaging. Selection depends on assembly line requirements and procurement preferences.

Q: Can the SMAJ440 be used interchangeably with these substitutes in existing designs?

A: Yes. All substitute parts maintain the same reverse standoff voltage (440V), package type (DO-214AC, SMA), mounting configuration (surface mount), and power rating (400W), ensuring electrical and mechanical compatibility in existing circuit designs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message