BAV99UE6327HTSA1 Equivalent & Substitute Parts

Part Overview

The BAV99UE6327HTSA1 is a general-purpose diode array manufactured by Infineon Technologies, configured as a 2-pair series connection with 80 V reverse voltage rating and 200 mA average rectified current per diode. The device is housed in a Surface Mount SC-74 (SOT-457) package and is designated as Last Time Buy, indicating end-of-life status. Identification of equivalent substitute parts is necessary to ensure continued design support and procurement availability for new production builds and legacy system maintenance.

Key Parameters

Parameter	Value
Diode Configuration	2 Pair Series Connection
Voltage - DC Reverse (Vr) (Max)	80 V
Current - Average Rectified (Io) (per Diode)	200 mA (DC)
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 150 mA
Reverse Recovery Time (trr)	4 ns
Current - Reverse Leakage @ Vr	150 nA @ 70 V
Operating Temperature - Junction (Max)	150°C
Mounting Type	Surface Mount
Package / Case	SC-74, SOT-457
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BAV99UE6327HTSA1 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Diode configuration must remain 2 Pair Series Connection
Reverse voltage rating (Vr) must be equal to or greater than 80 V
Average rectified current (Io) per diode must be equal to or greater than 200 mA
Forward voltage (Vf) characteristics must be compatible at specified test conditions
Reverse recovery time (trr) must support the same switching speed classification
Reverse leakage current must be within acceptable limits for the application

Mechanical Compatibility Criteria:

Surface Mount mounting type is required
Package footprint and pinout must be functionally equivalent or pin-compatible

The MMBD4448SDW from Diotec Semiconductor meets the core electrical requirements with a 75 V reverse voltage rating and 150 mA average rectified current per diode. While the voltage and current ratings are lower than the BAV99UE6327HTSA1, the MMBD4448SDW operates within the same small-signal diode speed classification and maintains identical forward voltage characteristics. The substitute part is available in active production status with significantly higher inventory availability.

Parameter Comparison

Parameter	BAV99UE6327HTSA1 (Infineon)	MMBD4448SDW (Diotec)	Compatibility
Diode Configuration	2 Pair Series Connection	2 Pair Series Connection	Match
Voltage - DC Reverse (Vr) (Max)	80 V	75 V	Substitute rated lower
Current - Average Rectified (Io) (per Diode)	200 mA (DC)	150 mA	Substitute rated lower
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 150 mA	1.25 V @ 150 mA	Match
Reverse Recovery Time (trr)	4 ns	4 ns	Match
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Match
Operating Temperature - Junction (Max)	150°C	150°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package / Case	SC-74, SOT-457	6-VSSOP, SC-88, SOT-363	Different package
Product Status	Last Time Buy	Active	Substitute in active production
RoHS Status	ROHS3 Compliant	Not applicable	Main part compliant

Engineering Selection Recommendations

Primary Consideration: Product Status

The BAV99UE6327HTSA1 is designated Last Time Buy, indicating Infineon has ceased active production and support. The MMBD4448SDW is in Active production status with 36,773 pieces in current inventory, providing assured long-term availability for new designs and production continuity.

Electrical Performance

The MMBD4448SDW operates at reduced voltage and current ratings (75 V / 150 mA versus 80 V / 200 mA). This substitution is valid only for applications where the circuit design operates within the lower electrical envelope. Applications requiring the full 80 V reverse voltage or 200 mA current capacity cannot use the MMBD4448SDW as a direct substitute.

Compliance and Certifications

The BAV99UE6327HTSA1 carries ROHS3 compliance certification and MSL Level 1 (Unlimited) moisture sensitivity rating. The MMBD4448SDW RoHS status is listed as Not Applicable. Design teams must verify compliance requirements for their specific application and regulatory jurisdiction before implementing this substitution.

Package Considerations

The BAV99UE6327HTSA1 uses SC-74 (SOT-457) packaging, while the MMBD4448SDW uses 6-VSSOP (SC-88, SOT-363) packaging. These packages have different footprints and pinout configurations. PCB layout redesign is required for substitution. Pin-to-pin functional equivalence must be verified against the specific application schematic.

Frequently Asked Questions (FAQ)

Q: Can the MMBD4448SDW directly replace the BAV99UE6327HTSA1 without circuit modification?

A: No. While both devices are 2-pair series connection diode arrays with identical forward voltage and reverse recovery time characteristics, the MMBD4448SDW has lower voltage (75 V vs. 80 V) and current (150 mA vs. 200 mA) ratings. Circuit analysis must confirm operation within the lower electrical envelope. Additionally, the different package types (SOT-457 vs. SOT-363) require PCB layout redesign.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: (1) matching diode configuration (2 Pair Series Connection), (2) reverse voltage rating equal to or exceeding the application requirement, (3) average rectified current capacity equal to or exceeding the application requirement, (4) compatible forward voltage characteristics, and (5) matching reverse recovery time classification for switching speed compatibility.

Q: Is the MMBD4448SDW suitable for applications requiring 80 V reverse voltage?

A: No. The MMBD4448SDW is rated for 75 V maximum reverse voltage. Applications requiring 80 V reverse voltage protection must use a substitute part with an 80 V or higher rating. Using an undersized device in this application creates risk of diode failure and circuit malfunction.

Q: What is the impact of different package types on substitution?

A: Package differences require complete PCB redesign. The BAV99UE6327HTSA1 (SC-74, SOT-457) and MMBD4448SDW (6-VSSOP, SC-88, SOT-363) have different footprints, pin spacing, and pinout configurations. Mechanical compatibility cannot be achieved without layout modification. Pin function mapping must be verified against both datasheets.

Q: Are there compliance or certification differences between these parts?

A: The BAV99UE6327HTSA1 is ROHS3 compliant with MSL Level 1 rating. The MMBD4448SDW RoHS status is listed as Not Applicable. Design teams must verify whether their application requires specific compliance certifications and confirm the MMBD4448SDW meets those requirements before implementation.

Q: Why is the BAV99UE6327HTSA1 designated Last Time Buy?

A: Last Time Buy designation indicates the manufacturer (Infineon) has ceased active production and will not accept new orders beyond a specified cutoff date. This is a standard end-of-life notification. Existing inventory may be available through authorized distributors, but long-term supply cannot be assured. Transition to an active production substitute is recommended for new designs.

Q: Can the MMBD4448SDW be used in legacy system repairs?

A: Substitution for legacy system repairs requires verification that the application circuit operates within the MMBD4448SDW electrical ratings (75 V / 150 mA) and that PCB layout can accommodate the different package type. If the original circuit was designed to utilize the full 80 V / 200 mA capability of the BAV99UE6327HTSA1, the substitute may not be suitable.

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