SMDB15C/TR7 Equivalent & Substitute Parts Reference

Part Overview

The SMDB15C/TR7 is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, part of the TVSarray™ series. This surface-mount component operates with a 15V reverse standoff voltage and 24V maximum clamping voltage, designed for general-purpose transient protection applications. The device is rated for 5A peak pulse current (8/20µs) with 300W peak pulse power dissipation across four bidirectional channels in an 8-SOIC package.

The part is currently Active in product status with 1059 units in stock. Equivalent and substitute parts are identified based on matching or compatible electrical parameters, mechanical packaging, and operational characteristics that permit direct or conditional replacement in circuit designs.

Substiute Parts

SMDB15C/TR7

Microchip TechnologyIn Stock: 1124SMDB15C/TR7 Datasheet

Current PartRFQ

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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ITA18B1RL

STMicroelectronicsIn Stock: 2433ITA18B1RL 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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SMDB15C

SMC Diode SolutionsIn Stock: 4768SMDB15C Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMDB15C/TR7 are classified based on the following substitution criteria:

Primary Matching Parameters:

• Voltage - Reverse Standoff (Typ): 15V
• Voltage - Clamping (Max) @ Ipp: 24V or compatible range
• Current - Peak Pulse (8/20µs): 5A or higher
• Package / Case: 8-SOIC or 8-SO equivalent
• Mounting Type: Surface Mount
• Bidirectional Channels: 4 or more
• Operating Temperature Range: -55°C to 150°C or compatible

Substitution Categories:

Category A - Direct Electrical Equivalents (Same Voltage Ratings): Parts with identical 15V reverse standoff and 24V clamping specifications, same 5A peak pulse current, and compatible packaging. These provide direct replacement capability.

Category B - Voltage-Compatible Alternatives (Different Standoff Voltage): Parts with different reverse standoff voltages (12V or 24V) but compatible clamping characteristics and current ratings. Selection depends on circuit voltage requirements.

Category C - Enhanced Performance Alternatives (Higher Current Rating): Parts with matching voltage specifications but higher peak pulse current ratings (10A, 17A, or 25A), providing improved transient handling capability.

Category D - Cross-Manufacturer Equivalents: Parts from alternative manufacturers (STMicroelectronics, Bourns Inc., Semtech Corporation, SMC Diode Solutions) meeting equivalent electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Category A):

SMDA15CE3/TR7 (Microchip Technology) provides direct electrical and mechanical equivalence to SMDB15C/TR7. This part matches all critical parameters: 15V reverse standoff, 24V clamping voltage, 5A peak pulse current, and 8-SOIC package. The primary distinction is RoHS3 compliance status. Selection of SMDA15CE3/TR7 is appropriate when RoHS compliance is required for end-product certification.

Voltage-Rated Alternatives (Category B):

SMDB12C/TR7 operates at 12V reverse standoff with 19V clamping. This part is suitable for circuits requiring lower voltage protection thresholds. SMDB24C/TR7 and SMDA24C/TR7 operate at 24V reverse standoff with 43V clamping, appropriate for higher-voltage circuit protection. Both maintain 5A peak pulse current and 8-SOIC packaging. Selection depends on circuit voltage requirements and is not interchangeable without circuit redesign.

Enhanced Current Capacity (Category C):

SMDA15C.TBT (Semtech Corporation) maintains 15V reverse standoff and 24V clamping specifications but provides 10A peak pulse current, doubling the transient handling capacity. CDNBS08-T15C (Bourns Inc.) offers 15V standoff with 30V clamping and 17A peak pulse current. ITA18B1RL (STMicroelectronics) provides 15V standoff with 28V clamping and 25A peak pulse current. These alternatives are suitable when enhanced transient suppression is required without changing voltage protection levels. All three are RoHS3 compliant.

Cross-Manufacturer Equivalents (Category D):

SMDB15C (SMC Diode Solutions) matches electrical specifications but provides only 1A peak pulse current, making it unsuitable as a direct replacement for 5A applications. This part is listed for reference only and does not constitute a viable substitute.

Compliance Considerations:

The original SMDB15C/TR7 is RoHS non-compliant. For applications requiring RoHS compliance, SMDA15CE3/TR7, SMDB12C/TR7, ITA18B1RL, CDNBS08-T15C, SMDA15C.TBT, and SMDB15C (SMC Diode Solutions) all carry ROHS3 compliance certification. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q1: Can SMDA15CE3/TR7 replace SMDB15C/TR7 in existing designs?

A: Yes. SMDA15CE3/TR7 is electrically and mechanically equivalent to SMDB15C/TR7. Both parts feature 15V reverse standoff voltage, 24V maximum clamping voltage, 5A peak pulse current (8/20µs), and 8-SOIC packaging. The primary difference is RoHS3 compliance status of SMDA15CE3/TR7. No circuit modifications are required for substitution.

Q2: What is the difference between SMDB24C/TR7 and SMDB15C/TR7?

A: SMDB24C/TR7 operates at a higher voltage rating: 24V reverse standoff and 43V maximum clamping voltage, compared to 15V standoff and 24V clamping for SMDB15C/TR7. Both maintain 5A peak pulse current and 8-SOIC packaging. SMDB24C/TR7 is designed for circuits requiring higher-voltage transient protection and is not interchangeable without circuit redesign.

Q3: Why would SMDA15C.TBT be selected over SMDB15C/TR7?

A: SMDA15C.TBT maintains identical voltage ratings (15V standoff, 24V clamping) and packaging (8-SOIC) but provides 10A peak pulse current versus 5A for SMDB15C/TR7. Selection of SMDA15C.TBT is appropriate when enhanced transient suppression capability is required. SMDA15C.TBT also carries RoHS3 compliance certification.

Q4: Is ITA18B1RL compatible with SMDB15C/TR7?

A: ITA18B1RL shares the same 15V reverse standoff voltage and 8-SOIC package as SMDB15C/TR7 but differs in clamping voltage (28V versus 24V) and peak pulse current (25A versus 5A). ITA18B1RL is a cross-manufacturer alternative from STMicroelectronics suitable when higher transient current handling is required. Circuit validation is recommended due to the higher clamping voltage specification.

Q5: What packaging formats are available for these TVS diodes?

A: The primary substitute parts are supplied in Tape & Reel (TR) format, matching the original SMDB15C/TR7 packaging. SMDB24C/TR7 is available in Cut Tape (CT) format. All parts maintain 8-SOIC (0.154", 3.90mm Width) surface-mount package specifications, ensuring mechanical compatibility with existing PCB layouts.

Q6: Are all substitute parts RoHS compliant?

A: No. The original SMDB15C/TR7 is RoHS non-compliant. Among the substitutes, SMDA15CE3/TR7, SMDB12C/TR7, ITA18B1RL, CDNBS08-T15C, SMDA15C.TBT, and SMDB15C (SMC Diode Solutions) carry ROHS3 compliance certification. SMDA24C/TR7 and SMDB24C/TR7 are RoHS non-compliant. Selection depends on end-product compliance requirements.

Q7: What is the significance of the 70pF capacitance specification?

A: Capacitance at 1MHz (70pF for SMDB15C/TR7) affects high-frequency circuit behavior and signal integrity. Substitute parts show varying capacitance values: SMDB12C/TR7 (95pF), SMDA24C/TR7 and SMDB24C/TR7 (45pF), ITA18B1RL (350pF), CDNBS08-T15C (80pF), and SMDA15C.TBT (75pF). Higher capacitance may impact signal fidelity in high-speed applications. Circuit-level validation is recommended when substituting parts with significantly different capacitance ratings.

Q8: Can SMDB12C/TR7 be used in place of SMDB15C/TR7?

A: No. SMDB12C/TR7 operates at 12V reverse standoff with 19V clamping voltage, compared to 15V standoff and 24V clamping for SMDB15C/TR7. This part is designed for lower-voltage protection circuits and is not interchangeable without circuit redesign and voltage threshold recalculation.

Q9: What does "Bidirectional Channels: 4" mean?

A: This specification indicates the TVS diode array contains four independent bidirectional protection channels within a single 8-SOIC package. Each channel provides transient suppression in both forward and reverse directions. Most substitute parts maintain four bidirectional channels; ITA18B1RL provides five channels. Channel count affects the number of signal lines that can be protected by a single component.

Q10: Why is inventory quantity relevant for part selection?

A: Inventory availability affects procurement lead time and supply chain reliability. SMDA15C.TBT shows the highest inventory (65,400 pcs), while SMDB15C/TR7 has 1,059 pcs available. Higher inventory levels may reduce procurement delays for high-volume production requirements. However, inventory levels are subject to change and should be verified with suppliers at time of purchase.