SMAJ90 Equivalent & Substitute Parts

Part Overview

The SMAJ90 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 90V reverse standoff voltage with a 153.3V maximum clamping voltage and 2.7A peak pulse current capability in a DO-214AC (SMA) package.

This part is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including HY Electronic, Micro Commercial Co, Microchip Technology, and Comchip Technology, offering comparable or enhanced electrical performance while maintaining compatibility with the original package and mounting requirements.

Substiute Parts

SMAJ90

Littelfuse Inc.In Stock: 1227SMAJ90 Datasheet

Current PartRFQ

SMAJ90A

HY Electronic (Cayman) LimitedIn Stock: 10366SMAJ90A Datasheet

DirectRFQ

SMAJ90A

HY Electronic (Cayman) LimitedIn Stock: 10366SMAJ90A Datasheet

DirectRFQ

SMAJ90A-TP

Micro Commercial CoIn Stock: 3843SMAJ90A-TP Datasheet

MFR RecommendedRFQ

SMAJ90AE3/TR13

Microchip TechnologyIn Stock: 760SMAJ90AE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ90E3/TR13

Microchip TechnologyIn Stock: 750SMAJ90E3/TR13 Datasheet

MFR RecommendedRFQ

TV04A900J-G

Comchip TechnologyIn Stock: 1115TV04A900J-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ90 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 90V
• Package / Case: Must be DO-214AC (SMA)
• Mounting Type: Must be Surface Mount
• Unidirectional Channels: Must be 1
• Type: Must be Zener

Substitute parts are grouped into two categories based on electrical performance:

Category A - Direct Electrical Equivalents: Parts with clamping voltage ≤ 153.3V and peak pulse current ≥ 2.7A maintain full functional compatibility with the original SMAJ90 specification.

Category B - Enhanced Performance Alternatives: Parts with clamping voltage ≤ 160V and peak pulse current ≥ 3.1A provide superior transient suppression capability while maintaining the same standoff voltage and package footprint.

All substitute parts listed maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage conditions.

Parameter Comparison

Engineering Selection Recommendations

SMAJ90A (HY Electronic) and TV04A900J-G (Comchip Technology) provide direct functional equivalence with lower clamping voltages (146V) and comparable peak pulse current ratings. Both parts are active products with full ROHS3 compliance and unlimited moisture sensitivity rating, suitable for immediate production deployment.

SMAJ90A-TP (Micro Commercial Co) offers the widest operating temperature range (-55 to 175°C TA) among active alternatives, making it suitable for applications requiring extended thermal performance. This part maintains the original 2.7A peak pulse current specification.

SMAJ90AE3/TR13 and SMAJ90E3/TR13 (Microchip Technology) deliver enhanced performance with higher peak pulse current ratings (3.4A and 3.1A respectively) and increased power dissipation capability (500W). The SMAJ90E3/TR13 variant features a 160V clamping voltage, providing additional margin for transient suppression. Both maintain the original -65 to 150°C temperature range and are suitable for applications requiring superior surge handling capability.

All substitute parts maintain DO-214AC (SMA) package compatibility, ensuring direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ90A replace SMAJ90 in existing designs?

A: Yes. SMAJ90A maintains the same 90V reverse standoff voltage, DO-214AC package, and surface-mount configuration. The 146V clamping voltage is lower than the original 153.3V specification, providing tighter voltage regulation. Peak pulse current is 2.8A compared to 2.7A, offering equivalent or superior performance.

Q: What is the difference between SMAJ90AE3/TR13 and SMAJ90E3/TR13?

A: Both are Microchip Technology products with identical 90V standoff voltage and DO-214AC packaging. SMAJ90AE3/TR13 features 146V clamping voltage with 3.4A peak pulse current and 500W power rating. SMAJ90E3/TR13 features 160V clamping voltage with 3.1A peak pulse current and 500W power rating. Selection depends on whether lower clamping voltage with higher current capacity (AE3) or higher clamping voltage with moderate current capacity (E3) is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating, meeting standard manufacturing and storage requirements.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not prevent substitution but should be evaluated against application requirements. SMAJ90A-TP supports -55 to 175°C (TA), the widest range among alternatives. SMAJ90AE3/TR13 and SMAJ90E3/TR13 maintain the original -65 to 150°C (TJ) specification. Other alternatives operate within -55 to 150°C (TJ) range.

Q: Can I use TV04A900J-G as a direct replacement?

A: Yes. TV04A900J-G (Comchip Technology) maintains 90V standoff voltage, 146V clamping voltage, 2.74A peak pulse current, and DO-214AC packaging. It is an active product with full ROHS3 compliance and is suitable for direct substitution in existing designs.

Q: What inventory considerations apply to these substitutes?

A: SMAJ90A (HY Electronic) has the highest available inventory at 10,300 pieces. SMAJ90A-TP (Micro Commercial) offers 3,765 pieces. Microchip variants (SMAJ90AE3/TR13 and SMAJ90E3/TR13) have lower inventory at 715 and 685 pieces respectively. TV04A900J-G (Comchip) provides 1,064 pieces. Inventory levels should be confirmed for production volume requirements.