SMDA15C/TR7 Equivalent & Substitute Parts

Part Overview

The SMDA15C/TR7 is an active transient voltage suppressor (TVS) diode manufactured by Microchip Technology, classified as a bidirectional 4-channel Zener diode in an 8-SO surface mount package. This component provides protection against transient voltage events in general-purpose applications. The active product status and established electrical specifications make it suitable for component selection in protection circuits requiring 15V reverse standoff voltage with 24V maximum clamping voltage. Alternative models are identified to accommodate supply chain variations, packaging preferences, and enhanced performance characteristics while maintaining electrical compatibility.

Substiute Parts

SMDA15C/TR7

Microchip TechnologyIn Stock: 958SMDA15C/TR7 Datasheet

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CDNBS08-T15C

Bourns Inc.In Stock: 17467CDNBS08-T15C Datasheet

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SMDA15C.TBT

Semtech CorporationIn Stock: 65490SMDA15C.TBT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Equivalent and substitute parts for the SMDA15C/TR7 are selected based on the following mandatory compatibility criteria:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 15V
• Voltage - Breakdown (Min): 16.7V
• Bidirectional Channels: 4
• Mounting Type: Surface Mount
• Package Case: 8-SOIC (0.154", 3.90mm Width)
• Type: Zener

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: Substitutes must not exceed 30V to maintain circuit protection envelope
• Current - Peak Pulse: Higher ratings provide enhanced protection margin without circuit incompatibility
• Power - Peak Pulse: Higher ratings indicate improved transient energy handling
• Capacitance @ Frequency: Minor variation acceptable; specified parts range 70-80pF @ 1MHz
• Operating Temperature: Specified parts maintain -55°C minimum; maximum may exceed base part
• RoHS Compliance: Not a substitution barrier for electrical function

Parameter Comparison

Engineering Selection Recommendations

SMDA15C/TR7 (Microchip Technology): Primary specification baseline. Active product status with established market availability. RoHS non-compliant status may require regulatory consideration for end applications.

CDNBS08-T15C (Bourns Inc.): Direct electrical substitute with enhanced performance characteristics. Highest peak pulse current rating (17A) and peak pulse power (500W) provide additional transient protection margin. ROHS3 compliant. Higher clamping voltage (30V typ) remains within acceptable protection envelope for 15V standoff applications. Highest inventory availability among specified substitutes.

SMDA15C.TBT (Semtech Corporation): Functional substitute with intermediate performance characteristics. Peak pulse current rating of 10A provides double the base part capacity. ROHS3 compliant. Operating temperature maximum of 125°C is 25°C lower than primary specification; verify compatibility for high-temperature applications. Part shares base model designation with primary component.

Frequently Asked Questions (FAQ)

Q: Can CDNBS08-T15C replace SMDA15C/TR7 in existing designs? A: Yes. Both parts share identical 15V reverse standoff and breakdown voltages, 4-channel bidirectional configuration, and 8-SOIC package dimensions. The CDNBS08-T15C provides superior current and power ratings, acceptable for applications designed for the base part specifications.

Q: What is the impact of clamping voltage differences? A: Substitute parts specify 30V maximum clamping voltage compared to 24V for the base part. This 6V difference does not compromise circuit protection. Both values remain sufficiently low to protect downstream circuitry rated for 15V operation. Higher clamping voltage in substitutes indicates additional protection margin under transient events.

Q: Are package and pinout compatibility guaranteed? A: Yes. All specified parts use 8-SOIC surface mount packages with identical footprint dimensions (0.154", 3.90mm width). Direct board-level substitution without layout modifications is supported.

Q: Does RoHS compliance status affect electrical performance? A: No. RoHS compliance is a manufacturing and environmental requirement that does not alter electrical specifications or circuit compatibility. Both RoHS-compliant and non-compliant options provide identical functional performance.

Q: Which substitute is recommended for high-temperature applications above 125°C? A: CDNBS08-T15C (Bourns) and SMDA15C/TR7 (Microchip) both support -55°C to 150°C operating range. SMDA15C.TBT (Semtech) operates to 125°C maximum and is not suitable for applications exceeding 125°C junction temperature.

Q: How do peak pulse current differences affect design selection? A: The base part is rated 5A (8/20µs). Substitutes rated 10A and 17A handle higher transient currents without performance degradation. For circuits with defined transient current profiles, any substitute meeting or exceeding the expected peak current provides safe operation.