SMAJ440C Equivalent & Substitute Parts

Part Overview

The SMAJ440C is a 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 with 748.65V maximum clamping voltage and 600mA peak pulse current capability in a DO-214AC (SMA) package. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMAJ440C

Littelfuse Inc.In Stock: 973SMAJ440C Datasheet

Current PartRFQ

SMAJ440CA

MeritekIn Stock: 37133SMAJ440CA Datasheet

DirectRFQ

SMAJ440CA

MeritekIn Stock: 37133SMAJ440CA Datasheet

DirectRFQ

SMAJ440CA-TP

Micro Commercial CoIn Stock: 820SMAJ440CA-TP Datasheet

MFR RecommendedRFQ

TV04A441JB-HF

Comchip TechnologyIn Stock: 869TV04A441JB-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ440C is determined by strict equivalence in the following electrical and mechanical parameters:

• Reverse standoff voltage: 440V (nominal)
• Package/case: DO-214AC (SMA) surface mount
• Bidirectional channels: 1
• Diode type: Zener
• Peak pulse power rating: 400W
• General-purpose application classification

All substitute parts listed maintain these core specifications. Variations in clamping voltage (713V vs. 748.65V), peak pulse current (560mA vs. 600mA), and operating temperature ranges are within acceptable tolerance for this product category and do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing support, addressing the obsolescence of the original SMAJ440C. Selection should be based on the following criteria:

SMAJ440CA (Meritek): Active product with ROHS3 compliance and unlimited moisture sensitivity level. Available in Tape & Reel packaging with 37,089 units in stock. Operating temperature range -55°C to 150°C. Peak pulse current rated at 560mA.

SMAJ440CA-TP (Micro Commercial Co): Active product with extended operating temperature range (-55°C to 175°C). Rated for 600mA peak pulse current, matching the original SMAJ440C specification. Available in bulk packaging with 747 units in stock. REACH compliance confirmed.

TV04A441JB-HF (Comchip Technology): Active product with ROHS3 compliance and unlimited moisture sensitivity level. Available in Tape & Reel packaging with 785 units in stock. Operating temperature range -55°C to 150°C. Peak pulse current rated at 560mA.

For applications requiring the full 600mA peak pulse current specification, SMAJ440CA-TP is the direct equivalent. For applications with standard current requirements, SMAJ440CA and TV04A441JB-HF provide functionally equivalent protection with active product support.

Frequently Asked Questions (FAQ)

Q: Can SMAJ440CA be used as a direct replacement for SMAJ440C?

A: Yes. Both parts maintain the same 440V reverse standoff voltage, 400W peak pulse power rating, and DO-214AC (SMA) package. The SMAJ440CA operates at 560mA peak pulse current versus the original 600mA, which is acceptable for general-purpose transient voltage suppression applications where the full current margin is not required.

Q: What is the difference between SMAJ440CA and SMAJ440CA-TP?

A: Both parts are manufactured to the same electrical specifications (440V standoff, 713V clamping). The primary differences are manufacturer (Meritek vs. Micro Commercial Co), packaging format (Tape & Reel vs. Bulk), and peak pulse current rating (560mA vs. 600mA). SMAJ440CA-TP also offers an extended operating temperature range to 175°C.

Q: Is TV04A441JB-HF compatible with the original SMAJ440C application?

A: Yes. TV04A441JB-HF maintains the same 440V reverse standoff voltage, 400W peak pulse power, and DO-214AC (SMA) package configuration. It is rated for 560mA peak pulse current and operates across -55°C to 150°C, making it functionally equivalent for general-purpose overvoltage protection.

Q: Are all substitute parts RoHS compliant?

A: SMAJ440CA, TV04A441JB-HF, and the original SMAJ440C are ROHS3 compliant. SMAJ440CA-TP compliance status is not specified in available documentation.

Q: What packaging options are available for these substitutes?

A: SMAJ440CA is available in Tape & Reel (TR) packaging. SMAJ440CA-TP is available in bulk packaging. TV04A441JB-HF is available in Tape & Reel (TR) packaging. All maintain the same DO-214AC (SMA) component package.

Q: Which substitute has the best temperature performance?

A: SMAJ440CA-TP offers the widest operating temperature range at -55°C to 175°C, compared to -55°C to 150°C for SMAJ440CA and TV04A441JB-HF, and -65°C to 150°C for the original SMAJ440C.