SMAJ170CA-TP Equivalent & Substitute Parts

Part Overview

The SMAJ170CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a 170V reverse standoff voltage and provides 275V maximum clamping voltage at peak pulse current. The component is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter tolerances for this DO-214AC (SMA) package category.

Substiute Parts

SMAJ170CA-TP

Micro Commercial CoIn Stock: 816SMAJ170CA-TP Datasheet

Current PartRFQ

SMAJ170CA

MeritekIn Stock: 1950SMAJ170CA Datasheet

DirectRFQ

SMAJ170CA

MeritekIn Stock: 1950SMAJ170CA Datasheet

DirectRFQ

SMAJ170CA-13-F

Diodes IncorporatedIn Stock: 30012SMAJ170CA-13-F Datasheet

SimilarRFQ

SMAJ170CA-TR

STMicroelectronicsIn Stock: 30130SMAJ170CA-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ170CA-TP are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage - Reverse Standoff (Typ): 170V
• Voltage - Breakdown (Min): 189V
• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Direct Substitutes maintain all critical parameters within acceptable tolerance. Similar Substitutes maintain core voltage and package specifications but may vary in peak pulse current, clamping voltage, or operating temperature range. All substitute parts listed are Active product status and ROHS3 compliant.

Parameter Comparison

Engineering Selection Recommendations

SMAJ170CA (Meritek) and SMAJ170CA-13-F (Diodes Incorporated) are direct functional equivalents to the SMAJ170CA-TP. Both maintain the 170V reverse standoff voltage, 189V minimum breakdown voltage, and 275V clamping voltage specification. Peak pulse current values (1.45A and 1.4A respectively) are within acceptable tolerance of the original 1.5A specification. Both parts are ROHS3 compliant with MSL 1 rating and Active product status. Operating temperature range is reduced to -55 to 150°C compared to the original -55 to 175°C; this parameter should be evaluated against application requirements.

SMAJ170CA-TR (STMicroelectronics) maintains voltage specifications but exhibits significantly higher peak pulse current (6.5A at 8/20µs pulse) and elevated clamping voltage (353V). This part is suitable only for applications requiring enhanced transient suppression capability and higher current handling. The TRANSIL™ series designation indicates specialized transient protection characteristics. Operating temperature range is -55 to 150°C.

All substitute parts are packaged in DO-214AC (SMA) surface-mount format, compatible with existing PCB layouts and assembly processes. Selection should be based on application-specific transient energy requirements and thermal operating conditions.

Frequently Asked Questions (FAQ)

Q: Can SMAJ170CA (Meritek) directly replace SMAJ170CA-TP in production?

A: Yes. Both parts maintain identical reverse standoff voltage (170V), breakdown voltage (189V), and clamping voltage (275V) specifications. Peak pulse current tolerance (1.45A vs. 1.5A) is within acceptable engineering margin for general-purpose TVS applications. Verify that the reduced operating temperature maximum (150°C vs. 175°C) does not conflict with application thermal requirements.

Q: What is the difference between SMAJ170CA-13-F and SMAJ170CA-TP?

A: SMAJ170CA-13-F (Diodes Incorporated) maintains all critical voltage parameters and package specifications. Peak pulse current is 1.4A compared to 1.5A, and operating temperature range is -55 to 150°C versus -55 to 175°C. The part number suffix "-13-F" indicates Diodes Incorporated's internal product designation. Electrical performance is equivalent for standard overvoltage protection applications.

Q: When should SMAJ170CA-TR (STMicroelectronics) be selected instead?

A: SMAJ170CA-TR is selected for applications requiring higher transient current suppression (6.5A vs. 1.5A) and elevated clamping voltage (353V vs. 275V). This part is suitable for circuits experiencing severe transient events or requiring enhanced energy absorption. The TRANSIL™ series provides specialized protection characteristics for industrial and automotive applications. Verify circuit compatibility before substitution, as the higher clamping voltage may affect downstream component stress levels.

Q: Are all substitute parts compatible with existing PCB layouts?

A: Yes. All substitute parts use the DO-214AC (SMA) surface-mount package with identical footprint and pin configuration. No PCB redesign is required. Verify solder reflow profiles and thermal management considerations remain within component specifications.

Q: What compliance certifications apply to substitute parts?

A: All listed parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is MSL 1 (unlimited) for all parts, indicating no special storage or handling requirements. ECCN classification is EAR99 for all parts.