KMB125F Equivalent & Substitute Parts

Part Overview

The KMB125F is a single-phase Schottky bridge rectifier diode manufactured by SMC Diode Solutions, rated for 1 A average rectified current at 250 V peak reverse voltage. The device is packaged in a 4-SMD, Gull Wing surface mount configuration with an MBF supplier package designation.

The KMB125F is classified as obsolete. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, procurement continuity, and system maintenance where this component is specified in active applications.

Substiute Parts

KMB125F

SMC Diode SolutionsIn Stock: 1091KMB125F Datasheet

Current PartRFQ

KMB120F

SMC Diode SolutionsIn Stock: 738KMB120F Datasheet

MFR RecommendedRFQ

KMB120F

SMC Diode SolutionsIn Stock: 738KMB120F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KMB125F is determined by the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Diode type must be single-phase Schottky technology
• Current rating must equal or exceed 1 A average rectified current
• Peak reverse voltage rating must equal or exceed 250 V
• Forward voltage drop must not exceed 920 mV @ 1 A
• Reverse leakage current must not exceed 50 µA at rated voltage
• Operating temperature range must encompass -55°C ~ 150°C

Mechanical Compatibility Criteria:

• Mounting type must be surface mount
• Package configuration must be 4-SMD, Gull Wing
• Supplier device package must be MBF

The KMB120F meets the mechanical and thermal requirements but operates at a reduced peak reverse voltage rating of 200 V, which is below the 250 V specification of the KMB125F. This part is suitable only for applications where the circuit design operates at or below 200 V peak reverse voltage.

Parameter Comparison

Engineering Selection Recommendations

KMB120F Substitution Criteria:

The KMB120F is an active product manufactured by SMC Diode Solutions and is RoHS3 compliant. This part shares identical mechanical packaging, thermal operating range, and current rating with the KMB125F.

The KMB120F operates at a peak reverse voltage of 200 V, which represents a 50 V reduction from the KMB125F specification. Selection of the KMB120F is appropriate only when the circuit design operates exclusively at or below 200 V peak reverse voltage. The forward voltage drop of the KMB120F (900 mV @ 1 A) is marginally lower than the KMB125F (920 mV @ 1 A), providing equivalent or improved thermal performance in rectification applications.

Both parts maintain identical moisture sensitivity classification (MSL 1) and REACH compliance status. The KMB120F availability (727 pieces in stock) supports procurement continuity for active designs.

Frequently Asked Questions (FAQ)

Q: Can the KMB120F directly replace the KMB125F in all applications?

A: The KMB120F is a direct mechanical and thermal substitute only for applications where the circuit peak reverse voltage does not exceed 200 V. Applications requiring the full 250 V rating of the KMB125F cannot use the KMB120F without circuit redesign or voltage derating analysis.

Q: What is the primary difference between these two parts?

A: The primary difference is the peak reverse voltage rating. The KMB125F is rated for 250 V, while the KMB120F is rated for 200 V. Both parts are identical in current rating (1 A), package configuration (4-SMD, Gull Wing), and operating temperature range (-55°C ~ 150°C).

Q: Are there any compliance or regulatory differences?

A: The KMB120F carries RoHS3 compliance certification, while the KMB125F product status is obsolete. Both parts are REACH affected and classified under ECCN EAR99. The KMB120F is the recommended active product for new designs and ongoing procurement.

Q: Does the KMB120F have better electrical performance?

A: The KMB120F exhibits a slightly lower forward voltage drop (900 mV @ 1 A versus 920 mV @ 1 A), which results in marginally reduced power dissipation. Reverse leakage current specifications are equivalent at their respective voltage ratings.

Q: What packaging considerations apply to both parts?

A: Both the KMB125F and KMB120F use identical 4-SMD, Gull Wing surface mount packaging with MBF supplier device package designation. No PCB layout or assembly process modifications are required when substituting between these parts, provided voltage rating compatibility is confirmed.