BAV103-7 Equivalent & Substitute Parts

Part Overview

The BAV103-7 is a surface mount switching diode manufactured by Diodes Incorporated, rated for 200 V DC reverse voltage with a 125 mA average rectified current. This component is classified as a small signal diode with a 50 ns reverse recovery time, packaged in the DO-213AC Mini MELF form factor. The BAV103-7 is designated as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

BAV103-7

Diodes IncorporatedIn Stock: 856BAV103-7 Datasheet

Current PartRFQ

BAV21W-7-F

Diodes IncorporatedIn Stock: 185495BAV21W-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BAV103-7 is determined by electrical parameter compatibility within the small signal diode category. The critical parameters governing substitution are:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) rating must equal or exceed 200 V
• Current - Average Rectified (Io) must accommodate the application requirement of 125 mA or higher
• Reverse Recovery Time (trr) must remain at 50 ns to maintain switching performance
• Current - Reverse Leakage @ Vr must not exceed 100 nA @ 200 V
• Forward voltage characteristics must be compatible with circuit design

Mechanical Compatibility Criteria:

• Surface mount mounting type required
• Package form factor must be compatible with PCB layout constraints

The BAV21W-7-F qualifies as a substitute based on matching all critical electrical parameters while offering enhanced current capacity (400 mA versus 125 mA) and improved product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The BAV21W-7-F is the manufacturer-recommended substitute for the obsolete BAV103-7. Selection of this substitute is supported by the following engineering factors:

Electrical Equivalence: The BAV21W-7-F maintains identical reverse voltage rating (200 V), reverse recovery time (50 ns), and reverse leakage current (100 nA @ 200 V). The current capacity of 400 mA exceeds the BAV103-7 requirement of 125 mA, providing design margin without introducing incompatibility.

Product Status: The BAV21W-7-F holds Active product status with substantial inventory availability (185,400 pcs), ensuring long-term procurement viability compared to the Obsolete BAV103-7 status.

Compliance Posture: The BAV21W-7-F is ROHS3 compliant and REACH unaffected, addressing regulatory requirements that may apply to new designs or manufacturing transitions.

Packaging Consideration: The BAV21W-7-F uses SOD-123 packaging instead of the Mini MELF form factor of the BAV103-7. PCB layout modification is required to accommodate this different package geometry.

Frequently Asked Questions (FAQ)

Q: Can the BAV21W-7-F directly replace the BAV103-7 without circuit modification?

A: Electrical substitution is valid. The BAV21W-7-F meets all critical electrical parameters. However, the package form factor differs (SOD-123 versus Mini MELF), requiring PCB layout adjustment and footprint redesign.

Q: What is the significance of the higher current rating (400 mA) in the BAV21W-7-F?

A: The increased current capacity provides design margin and does not introduce incompatibility. Applications requiring 125 mA or less operate within the BAV21W-7-F specification envelope.

Q: Are there compliance implications when transitioning from BAV103-7 to BAV21W-7-F?

A: The BAV21W-7-F is ROHS3 compliant, whereas the BAV103-7 is RoHS non-compliant. This transition aligns with current regulatory requirements for new manufacturing and design implementations.

Q: How do forward voltage characteristics compare between these diodes?

A: The BAV103-7 specifies 1 V maximum at 100 mA, while the BAV21W-7-F specifies 1.25 V maximum at 200 mA. Both values are compatible with standard circuit designs. The difference reflects measurement at different current levels and does not preclude substitution.

Q: What packaging considerations apply to this substitution?

A: The BAV103-7 uses Mini MELF (DO-213AC) packaging, a cylindrical surface mount form. The BAV21W-7-F uses SOD-123 packaging, a rectangular surface mount form. PCB footprint, solder pad geometry, and placement density must be re-evaluated for the new package.

Q: Is the 50 ns reverse recovery time maintained in the substitute?

A: Yes. Both the BAV103-7 and BAV21W-7-F specify 50 ns reverse recovery time, ensuring equivalent switching performance in high-frequency applications.