BAQ34-GS18 Equivalent & Substitute Parts

Part Overview

The BAQ34-GS18 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 60 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-80 (DO-213AC, MINI-MELF) package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain compatibility with the SOD-80 package footprint and support the electrical requirements of the application circuit.

Key Parameters

Parameter	BAQ34-GS18
Voltage - DC Reverse (Vr) (Max)	60 V
Current - Average Rectified (Io)	200 mA
Voltage - Forward (Vf) (Max)	1 V @ 100 mA
Current - Reverse Leakage @ Vr	1 nA @ 30 V
Capacitance @ Vr, F	3 pF @ 0V, 1MHz
Package / Case	DO-213AC, MINI-MELF, SOD-80
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 175°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the BAQ34-GS18 are selected based on the following criteria:

Mandatory Compatibility Parameters:

Package / Case: DO-213AC, MINI-MELF, SOD-80 (identical physical footprint required)
Mounting Type: Surface Mount
Current - Average Rectified (Io): 200 mA (exact match)
Technology: Standard (small signal rectifier classification)
RoHS Status: ROHS3 Compliant (regulatory alignment)

Allowable Variation Parameters:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 60 V
Voltage - Forward (Vf) (Max): Equal to or less than 1 V at rated current
Current - Reverse Leakage @ Vr: Equal to or less than 1 nA @ 30 V
Operating Temperature - Junction (Max): Equal to or greater than 175°C

The identified substitute parts maintain the SOD-80 package specification and 200 mA current rating while offering active product status and full regulatory compliance.

Parameter Comparison

Parameter	BAQ34-GS18 (Vishay)	FDLL4150 (onsemi)	FDLL457A (onsemi)
Voltage - DC Reverse (Vr) (Max)	60 V	50 V	70 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max)	1 V @ 100 mA	1 V @ 200 mA	1 V @ 10 mA
Current - Reverse Leakage @ Vr	1 nA @ 30 V	100 nA @ 50 V	25 nA @ 60 V
Capacitance @ Vr, F	3 pF @ 0V, 1MHz	2.5 pF @ 0V, 1MHz	6 pF @ 0V, 1MHz
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	175°C	175°C	175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

FDLL4150 (onsemi): This substitute is suitable for applications where the reverse voltage requirement does not exceed 50 V. The part maintains the 200 mA current rating and SOD-80 package compatibility. FDLL4150 is active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Forward voltage specification is provided at 200 mA, matching the rated current. Selection of this part requires confirmation that circuit reverse voltage stress remains below 50 V maximum.

FDLL457A (onsemi): This substitute provides 70 V reverse voltage rating, exceeding the original BAQ34-GS18 specification of 60 V. The part maintains the 200 mA current rating and SOD-80 package compatibility. FDLL457A is active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). This part is suitable for applications requiring equal or greater reverse voltage margin than the original design. Forward voltage specification is provided at 10 mA, which is below the rated current condition.

Both substitute parts are manufactured by onsemi, carry active product status, and maintain full regulatory compliance (ROHS3, REACH Unaffected, EAR99 ECCN classification). Selection between FDLL4150 and FDLL457A depends on the specific reverse voltage requirement of the application circuit.

Frequently Asked Questions (FAQ)

Q: Can FDLL4150 be used as a direct replacement for BAQ34-GS18?

A: FDLL4150 is compatible from a package and current rating perspective. However, the reverse voltage rating is 50 V compared to the original 60 V specification. Direct substitution is valid only if the application circuit operates at reverse voltages not exceeding 50 V.

Q: What is the advantage of FDLL457A over FDLL4150?

A: FDLL457A provides a 70 V reverse voltage rating, which exceeds the original BAQ34-GS18 specification of 60 V. This higher rating provides additional voltage margin for circuit protection and is suitable for applications with higher reverse voltage stress.

Q: Are both substitute parts available in the same package as BAQ34-GS18?

A: Yes. Both FDLL4150 and FDLL457A are specified in the DO-213AC, MINI-MELF, SOD-80 package, identical to the original BAQ34-GS18. Surface mount footprint compatibility is maintained.

Q: Do the substitute parts meet the same regulatory requirements?

A: Yes. Both FDLL4150 and FDLL457A are ROHS3 compliant, REACH unaffected, and classified as EAR99 under ECCN. Moisture sensitivity level is MSL 1 (unlimited) for both parts, matching the original specification.

Q: What is the difference in reverse leakage current between the parts?

A: BAQ34-GS18 specifies 1 nA @ 30 V. FDLL4150 specifies 100 nA @ 50 V, and FDLL457A specifies 25 nA @ 60 V. Reverse leakage increases with voltage stress; comparison at identical voltage conditions is not provided in the specifications.

Q: Which substitute part should be selected for a new design?

A: Selection depends on the circuit's reverse voltage requirement. If the maximum reverse voltage does not exceed 50 V, either part is suitable. If the circuit requires 50 V to 60 V reverse voltage capability, FDLL457A is the appropriate selection. Both parts are active products with full availability and regulatory compliance.

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