SMDB12CE3/TR7 Transient Voltage Suppressor (TVS) - Equivalent & Substitute Parts

Part Overview

The SMDB12CE3/TR7 is an active status Transient Voltage Suppressor diode manufactured by Microchip Technology, part of the TVSarray™ series. This bidirectional, 4-channel TVS diode is designed for general-purpose transient suppression in surface-mount applications. The component operates with a 12V reverse standoff voltage and provides a 19V maximum clamping voltage at peak pulse current, with a peak pulse power rating of 300W.

Finding equivalent and substitute parts is necessary to address inventory availability, lead time constraints, supply chain disruptions, or design flexibility requirements without compromising circuit protection specifications.

Substiute Parts

SMDB12CE3/TR7

Microchip TechnologyIn Stock: 799SMDB12CE3/TR7 Datasheet

Current PartRFQ

SMDB12C/TR7

Microchip TechnologyIn Stock: 4143SMDB12C/TR7 Datasheet

DirectRFQ

CDNBS08-T12C

Bourns Inc.In Stock: 4964CDNBS08-T12C Datasheet

SimilarRFQ

SMDA12C.TBT

Semtech CorporationIn Stock: 1862SMDA12C.TBT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution criteria for TVS diodes are determined by the following key parameters:

Critical Parameters (Must Match or Exceed):

• Voltage - Reverse Standoff: 12V (Typ)
• Voltage - Breakdown (Min): 13.3V (minimum threshold)
• Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Bidirectional Configuration: 4 channels
• Type: Zener diode

Performance Parameters (Application-Dependent):

• Voltage - Clamping (Max) @ Ipp: must not significantly exceed application voltage limits
• Current - Peak Pulse: must meet or exceed circuit transient suppression requirements
• Power - Peak Pulse: must accommodate expected energy dissipation

The substitute parts listed below maintain the critical electrical and mechanical parameters, ensuring direct functional replacement in the SMDB12CE3/TR7 application circuit.

Parameter Comparison

Engineering Selection Recommendations

SMDB12C/TR7 (Microchip Technology)

This is the direct Microchip equivalent to SMDB12CE3/TR7, maintaining identical electrical specifications and the same TVSarray™ series design. Both parts are active status and ROHS3 compliant with MSL-1 moisture sensitivity. This represents the preferred direct replacement option, with higher inventory availability (4083 pcs vs. 738 pcs).

CDNBS08-T12C (Bourns Inc.)

This Bourns substitute maintains the critical 12V reverse standoff and 13.3V breakdown voltages required for this application. The clamping voltage is higher at 25.9V (Typ) and peak pulse current is significantly higher at 21A, with increased power dissipation capability (500W vs. 300W). This component is suitable for applications requiring enhanced transient suppression capability. All compliance specifications (ROHS3, MSL-1) are equivalent.

SMDA12C.TBT (Semtech Corporation)

This Semtech SMDAC series substitute meets the critical voltage and package requirements. The component offers intermediate peak pulse current (12A) and clamping voltage (24V) between the original and the Bourns option. The operating temperature range is limited to -55°C ~ 125°C compared to 150°C maximum junction temperature of the primary part. This substitute is suitable where the reduced maximum operating temperature does not conflict with application requirements.

Frequently Asked Questions (FAQ)

Q: Can SMDB12C/TR7 be used interchangeably with SMDB12CE3/TR7?

A: Yes. SMDB12C/TR7 is an equivalent direct substitute. Both parts maintain identical electrical specifications, reverse standoff voltage (12V), breakdown voltage (13.3V), clamping voltage (19V), peak pulse current (5A), and operating temperature range (-55°C to 150°C). The primary difference is part numbering designation. Both are Microchip Technology TVSarray™ components with active product status.

Q: What are the differences between the three substitute options?

A: The three substitutes differ in peak pulse current capacity and clamping voltage. SMDB12C/TR7 matches the original exactly. CDNBS08-T12C (Bourns) provides higher current handling (21A) and power dissipation (500W). SMDA12C.TBT (Semtech) offers intermediate current capability (12A) with a maximum operating temperature of 125°C instead of 150°C.

Q: Are all four parts packaged identically?

A: Yes. All four parts use the 8-SOIC (0.154", 3.90mm Width) surface-mount package, ensuring mechanical and footprint compatibility on the printed circuit board. Packaging variations between Tape & Reel (TR) and Cut Tape (CT) Digi-Reel® are supply chain options only and do not affect the component's electrical or physical form factor.

Q: Can the Bourns CDNBS08-T12C substitute where the original 5A peak pulse specification is critical?

A: The Bourns CDNBS08-T12C provides 21A peak pulse capacity, which exceeds the 5A requirement. The higher current capacity does not degrade performance in applications designed for 5A. However, circuits designed with precise clamping voltage sensitivity should account for the higher clamping voltage of 25.9V (Typ) versus 19V.

Q: Are all parts RoHS compliant?

A: Yes. All four parts are ROHS3 compliant with MSL-1 (Unlimited) moisture sensitivity level, meeting industrial environmental and reliability standards. All are active status products from established manufacturers.

Q: Does the higher capacitance of the Semtech part (120pF vs. 95pF) affect circuit performance?

A: The capacitance difference (120pF at SMDA12C.TBT versus 95pF at SMDB12CE3/TR7) is within typical application tolerances for TVS diode installations. Capacitance effects are application-specific and depend on circuit impedance and frequency characteristics. Circuit validation is necessary if capacitance is a critical parameter.