SMAJ180C Equivalent & Substitute Parts

Part Overview

The SMAJ180C 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 180V reverse standoff voltage with a 306.6V maximum clamping voltage and 1.4A 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

SMAJ180C

Littelfuse Inc.In Stock: 1011SMAJ180C Datasheet

Current PartRFQ

SMAJ180CA

MeritekIn Stock: 2249SMAJ180CA Datasheet

DirectRFQ

SMAJ188CA-TR

STMicroelectronicsIn Stock: 30266SMAJ188CA-TR Datasheet

MFR RecommendedRFQ

TV04A181JB-G

Comchip TechnologyIn Stock: 820TV04A181JB-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ180C is determined by the following critical parameters:

Primary Matching Criteria:

• Reverse standoff voltage: 180V (±tolerance)
• Package type: DO-214AC (SMA) surface mount
• Bidirectional channels: 1
• Type: Zener diode
• RoHS3 compliance
• General-purpose application classification

Secondary Compatibility Parameters:

• Voltage breakdown minimum: ≥190.35V
• Clamping voltage maximum: within acceptable range for circuit protection
• Peak pulse current: ≥1.37A minimum
• Power dissipation: 400W
• Operating temperature range: -55°C to 150°C minimum

The substitute parts listed below meet these criteria and are qualified as direct replacements for the obsolete SMAJ180C in equivalent circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

SMAJ180CA (Meritek) and TV04A181JB-G (Comchip Technology) provide the closest electrical equivalence to the SMAJ180C. Both maintain the 180V reverse standoff voltage, 291.6V clamping voltage, and 1.37A peak pulse current specification. These parts are functionally interchangeable for applications requiring the original SMAJ180C performance envelope. Both manufacturers maintain active product status with ROHS3 compliance and unlimited moisture sensitivity rating.

SMAJ188CA-TR (STMicroelectronics) offers an alternative with a higher reverse standoff voltage (188V) and significantly elevated peak pulse current capability (6A at 8/20µs pulse). This part is suitable for applications requiring enhanced transient suppression performance but operates at a higher clamping voltage (388V). Selection of this part requires verification that the circuit design accommodates the increased clamping voltage specification.

All substitute parts are available in active production status with established supply chains and full RoHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ180CA or TV04A181JB-G be used as direct replacements for SMAJ180C?

A: Yes. Both parts maintain identical reverse standoff voltage (180V), clamping voltage (291.6V), and peak pulse current (1.37A) specifications. Package type (DO-214AC/SMA) and electrical performance are equivalent. Both are ROHS3 compliant with active product status.

Q: What is the difference between SMAJ180CA and TV04A181JB-G?

A: Both parts share identical electrical specifications (180V standoff, 291.6V clamp, 1.37A peak pulse). The primary difference is manufacturer: Meritek versus Comchip Technology. Selection may depend on supply availability and procurement preferences.

Q: Is SMAJ188CA-TR compatible with SMAJ180C applications?

A: SMAJ188CA-TR operates at a higher reverse standoff voltage (188V) and clamping voltage (388V) with significantly higher peak pulse current (6A). While the package is identical (DO-214AC/SMA), the elevated clamping voltage may affect circuit behavior. Use this part only when circuit design permits the higher voltage specification.

Q: What is the operating temperature difference between SMAJ180C and the substitute parts?

A: SMAJ180C operates from -65°C to 150°C. All substitute parts operate from -55°C to 150°C. The upper temperature limit is identical; the lower limit differs by 10°C. Verify application requirements for low-temperature operation below -55°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SMAJ180CA, SMAJ188CA-TR, and TV04A181JB-G are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

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

A: SMAJ180CA is available in standard packaging. SMAJ188CA-TR is supplied in Cut Tape (CT) and Digi-Reel® formats. TV04A181JB-G is supplied in Tape & Reel (TR) format. Confirm packaging requirements with procurement specifications.