DF1508ST-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DF1508ST-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 800 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part is housed in a 4-SMD Gull Wing package suitable for surface mount applications across industrial and consumer electronics.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1.5 A
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DF1508ST-G are qualified based on the following electrical and mechanical parameters:

Voltage - Peak Reverse (Max): 800 V
Current - Average Rectified (Io): 1.5 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V maximum
Operating Temperature Range: -55°C ~ 150°C (TJ)
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing
Diode Type: Single Phase
Technology: Standard

All substitute parts listed maintain these core electrical specifications and physical form factor. Variations in reverse leakage current and product status are noted but do not disqualify substitution where electrical performance requirements are met.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Packaging Type
DF1508ST-G	Comchip Technology	Obsolete	800 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	-
DF1508S-G	Comchip Technology	Active	800 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Tube
DB156S	SMC Diode Solutions	Active	800 V	1.5 A	1.1 V @ 1.5 A	5 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Tape & Reel (TR)
DBLS156G	Taiwan Semiconductor Corporation	Active	800 V	1.5 A	1.1 V @ 1.5 A	2 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Tape & Reel (TR)
DBLS156GH	Taiwan Semiconductor Corporation	Active	800 V	1.5 A	1.1 V @ 1.5 A	2 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Tape & Reel (TR)
DF08S	onsemi	Not For New Designs	800 V	1.5 A	1.1 V @ 1 A	10 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Cut Tape (CT) & Digi-Reel®
DF1508S-E3/77	Vishay General Semiconductor - Diodes Division	Active	800 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Tape & Reel (TR)
DFL1508S-E3/77	Vishay General Semiconductor - Diodes Division	Active	800 V	1.5 A	1.1 V @ 1.5 A	5 µA @ 800 V	-55°C ~ 150°C	4-SMD, Gull Wing	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: DF1508S-G

The DF1508S-G from Comchip Technology is the manufacturer-recommended substitute. It maintains identical electrical specifications to the DF1508ST-G while offering active product status. This part is available in Tube packaging and represents the direct replacement path from the obsolete DF1508ST-G.

Secondary Recommendations for Active Designs:

DF1508S-E3/77 (Vishay General Semiconductor - Diodes Division) and DFL1508S-E3/77 (Vishay General Semiconductor - Diodes Division) are active alternatives with full electrical compatibility. Both are supplied in Tape & Reel packaging suitable for automated assembly. DFL1508S-E3/77 offers improved reverse leakage characteristics (5 µA vs. 10 µA).

Alternative Options:

DB156S (SMC Diode Solutions) and DBLS156G (Taiwan Semiconductor Corporation) provide parametric equivalence with improved reverse leakage performance. DBLS156GH includes automotive-grade qualification (AEC-Q101) for applications requiring automotive compliance.

Not Recommended for New Designs:

DF08S (onsemi) carries a "Not For New Designs" status and should be avoided for new product development despite electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can DF1508S-G directly replace DF1508ST-G?

A: Yes. DF1508S-G is the manufacturer-recommended substitute with identical electrical specifications (800 V, 1.5 A, 1.1 V forward voltage). The primary difference is packaging format (Tube vs. original packaging) and active product status.

Q: What is the difference between DBLS156G and DBLS156GH?

A: Both parts are electrically identical with 800 V, 1.5 A ratings and identical reverse leakage (2 µA). DBLS156GH includes automotive-grade qualification (AEC-Q101) and is suitable for automotive applications. DBLS156G is suitable for general industrial and consumer applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original DF1508ST-G specification.

Q: What packaging formats are available?

A: Substitute parts are available in multiple packaging formats: Tube (DF1508S-G), Tape & Reel (DB156S, DBLS156G, DBLS156GH, DF1508S-E3/77, DFL1508S-E3/77), and Cut Tape with Digi-Reel (DF08S). Selection depends on assembly process requirements.

Q: Can I use parts with lower reverse leakage current?

A: Yes. Parts with lower reverse leakage (DBLS156G, DBLS156GH at 2 µA, or DFL1508S-E3/77 at 5 µA) are direct substitutes and provide improved performance characteristics while maintaining all other electrical specifications.

Q: Is DF08S suitable for new designs?

A: No. DF08S carries "Not For New Designs" status and should not be used in new product development, despite electrical compatibility with the DF1508ST-G.

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