SMDB15C/TR13 Equivalent & Substitute Parts

Part Overview

The SMDB15C/TR13 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designated for general-purpose overvoltage protection in surface-mount applications. This device operates with a 15V reverse standoff voltage and provides 24V maximum clamping voltage with 5A peak pulse current capability. The product maintains Active status and is packaged in an 8-SOIC form factor suitable for automated assembly.

Alternative parts become necessary when considering factors such as higher current-handling requirements, enhanced RoHS compliance, extended operating temperature ranges, or availability constraints.

Substiute Parts

SMDB15C/TR13

Microchip TechnologyIn Stock: 863SMDB15C/TR13 Datasheet

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SMDA15C.TBT

Semtech CorporationIn Stock: 65490SMDA15C.TBT Datasheet

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CDNBS08-T15C

Bourns Inc.In Stock: 17467CDNBS08-T15C Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMDB15C/TR13 is determined by the following core electrical and mechanical parameters: identical 15V reverse standoff voltage, 16.7V minimum breakdown voltage, 4 bidirectional channels, 8-SOIC surface-mount package, and -55°C to 150°C minimum operating temperature range.

The identified substitute parts maintain these critical parameters while offering enhanced performance characteristics in secondary attributes. The SMDA15C.TBT (Semtech) and CDNBS08-T15C (Bourns) both preserve the voltage protection window and packaging requirements. Substitution differences emerge in peak pulse current capacity (10A vs. 17A), clamping voltage (30V vs. original 24V), and RoHS compliance status, which must be evaluated within specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The SMDB15C/TR13 remains the primary specification when current requirements are limited to 5A peak pulse and clamping voltage specifications of 24V are acceptable. This device is suitable for applications where the extended 150°C upper operating temperature limit is advantageous.

The SMDA15C.TBT (Semtech) provides RoHS3 compliance and doubles the peak pulse current capacity to 10A while maintaining the same 300W peak power dissipation. However, the maximum operating temperature is reduced to 125°C, which may limit applicability in high-temperature environments. This substitute is appropriate for designs requiring regulatory compliance and moderate current enhancements.

The CDNBS08-T15C (Bourns) offers the highest current-handling capacity at 17A peak pulse with 500W peak power dissipation, combined with RoHS3 compliance and full -55°C to 150°C operating temperature range. The higher clamping voltage (30V typical) may require circuit verification if the original 24V specification is critical.

Frequently Asked Questions (FAQ)

Q: Can SMDA15C.TBT be used as a direct replacement for SMDB15C/TR13?

A: The SMDA15C.TBT maintains the required 15V standoff voltage, 16.7V breakdown voltage, and 8-SOIC package compatibility. However, the reduced maximum operating temperature (125°C vs. 150°C) and increased clamping voltage (30V vs. 24V) must be evaluated against application requirements.

Q: What is the primary advantage of the CDNBS08-T15C?

A: The CDNBS08-T15C provides superior current-handling capability (17A vs. 5A), increased power dissipation (500W vs. 300W), RoHS3 compliance, and maintains the full operating temperature range of the original device.

Q: Are all three parts identical in package dimensions?

A: All three devices utilize the 8-SOIC package with identical dimensions (0.154", 3.90mm width), enabling direct printed circuit board compatibility.

Q: How does clamping voltage difference affect substitution?

A: The SMDB15C/TR13 specifies 24V maximum clamping, while both substitute parts specify 30V. Higher clamping voltage provides additional protection margin but may exceed circuit specifications if precise voltage limiting is required.

Q: What is the significance of RoHS compliance status?

A: The SMDB15C/TR13 is RoHS non-compliant, while SMDA15C.TBT and CDNBS08-T15C are ROHS3 compliant. RoHS3 compliance is required for many regulatory applications and end-market requirements.