SMDB03C/TR7 Equivalent & Substitute Parts

Part Overview

The SMDB03C/TR7 is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This 8-SO package device features a 3.3V reverse standoff voltage with a 9V maximum clamping voltage and 5A peak pulse current rating (8/20µs). The part is currently active in production with 830 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for TVS diode applications. Alternative models may be required due to inventory availability, packaging format preferences, or compliance requirements.

Substiute Parts

SMDB03C/TR7

Microchip TechnologyIn Stock: 883SMDB03C/TR7 Datasheet

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SMDA15CE3/TR7

Microchip TechnologyIn Stock: 1680SMDA15CE3/TR7 Datasheet

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SMDA24C/TR7

Microchip TechnologyIn Stock: 1720SMDA24C/TR7 Datasheet

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SMDB12C/TR7

Microchip TechnologyIn Stock: 4143SMDB12C/TR7 Datasheet

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SMDB24C/TR7

Microchip TechnologyIn Stock: 2089SMDB24C/TR7 Datasheet

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SMDB03C

SMC Diode SolutionsIn Stock: 2935SMDB03C Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMDB03C/TR7 are identified based on the following critical parameters that determine functional equivalence in TVS diode applications:

Primary Substitution Criteria:

• Package type: 8-SOIC surface-mount configuration
• Bidirectional channel count: 4 channels
• Peak pulse current capability: 5A (8/20µs)
• Power dissipation: 300W peak pulse
• Operating temperature range: -55°C to 150°C
• Mounting type: Surface mount

Voltage Rating Considerations: Substitute parts are grouped by reverse standoff voltage class. The SMDB03C/TR7 operates at 3.3V standoff. Substitutes within the same voltage class maintain identical circuit protection thresholds. Higher voltage-rated devices (12V, 15V, 24V classes) function as substitutes only in applications where the protected circuit operates at those respective voltage levels.

Packaging Format: The primary part is supplied in Tape & Reel (TR) format. Substitutes maintaining TR packaging ensure compatibility with automated assembly processes. Cut Tape (CT) variants are functionally equivalent but differ in supply format.

Compliance Status: RoHS compliance status is documented for each part. Non-compliant parts may be restricted in certain applications or regions.

Parameter Comparison

Engineering Selection Recommendations

Same Voltage Class (3.3V Standoff):

The SMDB03C manufactured by SMC Diode Solutions is functionally equivalent to the SMDB03C/TR7 for 3.3V protection applications. Both devices share identical reverse standoff voltage (3.3V), breakdown voltage (4V minimum), and 8-SOIC package configuration. The SMC variant offers ROHS3 compliance, whereas the Microchip part is RoHS non-compliant. The SMC device operates at a reduced peak pulse current (1A versus 5A) and lower operating temperature maximum (125°C versus 150°C), making it suitable only for lower-current protection circuits. The SMC part provides higher peak pulse power rating (500W versus 300W) and lower clamping voltage (7V versus 9V).

Higher Voltage Classes (12V, 15V, 24V Standoff):

The SMDB12C/TR7, SMDA15CE3/TR7, SMDA24C/TR7, and SMDB24C/TR7 are substitutes only for applications requiring protection at their respective voltage levels. These parts maintain the same 8-SOIC package, 4-channel bidirectional configuration, 5A peak pulse current, and 300W power rating as the main part. The SMDB12C/TR7 and SMDA15CE3/TR7 are ROHS3 compliant, while SMDA24C/TR7 and SMDB24C/TR7 are RoHS non-compliant. Capacitance values decrease with increasing voltage rating (95pF at 12V, 70pF at 15V, 45pF at 24V), reflecting the inverse relationship between voltage rating and junction capacitance in TVS diodes.

Packaging Format Consideration:

The SMDB24C/TR7 is available in Cut Tape (CT) format, differing from the standard Tape & Reel (TR) supply method. Both formats contain identical components; the difference is in supply packaging for assembly processes.

Compliance and Temperature Range:

Applications requiring ROHS3 compliance should specify SMDB03C (SMC), SMDB12C/TR7, or SMDA15CE3/TR7. Applications requiring the full -55°C to 150°C operating range should avoid the SMC SMDB03C variant, which is limited to -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can SMDB03C/TR7 be replaced with SMDB03C from SMC Diode Solutions?

A: The SMC SMDB03C is functionally equivalent for 3.3V protection applications in terms of voltage ratings and package type. However, it differs in peak pulse current (1A versus 5A), maximum operating temperature (125°C versus 150°C), and RoHS compliance status (ROHS3 compliant versus non-compliant). Substitution is valid only if the application circuit operates within the SMC device's current and temperature specifications.

Q: What is the difference between SMDA24C/TR7 and SMDB24C/TR7?

A: Both parts are 24V standoff TVS diodes in 8-SOIC packages with identical electrical specifications (5A peak pulse, 300W power, 43V clamping voltage). The primary difference is packaging format: SMDA24C/TR7 is supplied in Tape & Reel (TR) format, while SMDB24C/TR7 is supplied in Cut Tape (CT) format. Component performance is identical; the choice depends on assembly process requirements.

Q: Can I use a 12V or 15V rated TVS diode in place of the 3.3V SMDB03C/TR7?

A: No. The SMDB12C/TR7, SMDA15CE3/TR7, and higher voltage-rated devices are designed for circuits operating at their respective voltage levels. Using a 12V or 15V device in a 3.3V circuit will not provide adequate protection, as the device will not clamp until the higher voltage threshold is reached.

Q: What does "Bidirectional Channels: 4" mean?

A: All listed substitute parts contain four independent bidirectional TVS diode channels within a single 8-SOIC package. Each channel provides overvoltage protection in both forward and reverse directions, allowing protection of multiple signal lines or differential pairs from a single component.

Q: How does capacitance affect TVS diode selection?

A: Capacitance values are provided for reference in high-frequency applications. The SMDB03C/TR7 has 300pF capacitance at 1MHz. Higher voltage-rated devices exhibit lower capacitance (45pF to 95pF), which may be advantageous in sensitive analog or high-speed digital circuits where capacitive loading must be minimized.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface-mount package, ensuring mechanical and footprint compatibility with the SMDB03C/TR7.

Q: What is the significance of RoHS compliance status?

A: RoHS (Restriction of Hazardous Substances) compliance indicates whether the component meets environmental regulations restricting lead and other hazardous materials. ROHS3-compliant parts (SMDB03C from SMC, SMDB12C/TR7, SMDA15CE3/TR7) are required for applications subject to EU or equivalent environmental regulations. Non-compliant parts may be restricted in certain markets or applications.