DF1506ST-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DF1506ST-G is a single-phase bridge rectifier diode manufactured by Comchip Technology, rated for 600 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part is housed in a 4-SMD Gull Wing surface mount package (DFS) and operates across the temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	600 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1.5 A
Current - Reverse Leakage @ Vr	10 µA @ 600 V
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

Substitution of the DF1506ST-G is determined by strict equivalence across the following critical parameters:

Voltage - Peak Reverse (Max): 600 V
Current - Average Rectified (Io): 1.5 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1.5 A
Diode Type: Single Phase
Technology: Standard
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing
Operating Temperature Range: -55°C ~ 150°C (TJ)

Substitute parts are grouped into two categories: MFR Recommended (direct manufacturer upgrade) and Parametric Equivalents (functionally equivalent from alternative manufacturers). All listed substitutes maintain the core electrical specifications and physical form factor required for direct replacement in existing designs.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Product Status	Packaging
DF1506ST-G	Comchip Technology	600 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 600 V	-55°C ~ 150°C	Obsolete	-
DF1506S-G	Comchip Technology	600 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 600 V	-55°C ~ 150°C	Active	Tube
DB155S	SMC Diode Solutions	600 V	1.5 A	1.1 V @ 1.5 A	5 µA @ 600 V	-55°C ~ 150°C	Active	Tape & Reel (TR)
DBLS155G	Taiwan Semiconductor Corporation	600 V	1.5 A	1.1 V @ 1.5 A	2 µA @ 600 V	-55°C ~ 150°C	Active	Tape & Reel (TR)
DBLS155GH	Taiwan Semiconductor Corporation	600 V	1.5 A	1.1 V @ 1.5 A	2 µA @ 600 V	-55°C ~ 150°C	Active	Tape & Reel (TR)
DF06S	Fairchild Semiconductor	600 V	1 A	1.1 V @ 1 A	10 µA @ 600 V	-65°C ~ 150°C	Active	-
DF1506S-E3/77	Vishay General Semiconductor - Diodes Division	600 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 600 V	-55°C ~ 150°C	Active	Tape & Reel (TR)
DFL1506S-E3/77	Vishay General Semiconductor - Diodes Division	600 V	1.5 A	1.1 V @ 1.5 A	5 µA @ 600 V	-55°C ~ 150°C	Active	Tape & Reel (TR)
SDB155-TP	Micro Commercial Co	600 V	1.5 A	1.1 V @ 1.5 A	10 µA @ 600 V	-55°C ~ 150°C	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: DF1506S-G

The DF1506S-G is the manufacturer-recommended upgrade from Comchip Technology. This part maintains identical electrical specifications to the obsolete DF1506ST-G while offering active product status. The primary difference is packaging format (Tube versus unspecified for the original). This part is ROHS3 compliant and carries unlimited moisture sensitivity level rating.

Secondary Recommendations: Full Parametric Equivalents

The following parts provide complete parametric equivalence with 600 V / 1.5 A ratings and identical forward voltage characteristics:

DF1506S-E3/77 (Vishay): Active status, ROHS3 compliant, Tape & Reel packaging, 10 µA reverse leakage
DFL1506S-E3/77 (Vishay): Active status, ROHS3 compliant, Tape & Reel packaging, improved 5 µA reverse leakage
DB155S (SMC Diode Solutions): Active status, Tape & Reel packaging, improved 5 µA reverse leakage
DBLS155G (Taiwan Semiconductor Corporation): Active status, Tape & Reel packaging, improved 2 µA reverse leakage
DBLS155GH (Taiwan Semiconductor Corporation): Active status, Tape & Reel packaging, improved 2 µA reverse leakage, AEC-Q101 automotive qualification
SDB155-TP (Micro Commercial Co): Active status, Tape & Reel packaging, 10 µA reverse leakage

Alternative with Reduced Current Rating: DF06S

The DF06S from Fairchild Semiconductor provides 600 V peak reverse voltage but with reduced average rectified current of 1 A (versus 1.5 A). This part is suitable only for applications where the 1 A current rating is acceptable. Operating temperature range extends to -65°C minimum.

All recommended substitutes maintain ROHS3 compliance and surface mount form factor compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can DF06S be used as a direct replacement for DF1506ST-G?

A: DF06S is not a direct replacement. While it shares the 600 V peak reverse voltage and 4-SMD Gull Wing package, the average rectified current is reduced to 1 A compared to the 1.5 A rating of DF1506ST-G. Use DF06S only if your application current requirements do not exceed 1 A.

Q: What is the difference between DBLS155G and DBLS155GH?

A: Both parts are electrically identical with 600 V / 1.5 A ratings and 2 µA reverse leakage. DBLS155GH carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring this certification. DBLS155G is the standard industrial grade version.

Q: Are all substitute parts available in the same package format?

A: All substitute parts use the 4-SMD Gull Wing surface mount package, ensuring physical compatibility. Packaging formats differ (Tube, Tape & Reel, or unspecified), which affects procurement and handling but not electrical or mechanical fit on the PCB.

Q: Which substitute offers the best reverse leakage performance?

A: DBLS155G and DBLS155GH both offer the lowest reverse leakage at 2 µA @ 600 V, compared to 10 µA for the original DF1506ST-G. DFL1506S-E3/77 and DB155S offer intermediate performance at 5 µA @ 600 V.

Q: Is the DF1506S-G the only option from Comchip Technology?

A: DF1506S-G is the active manufacturer-recommended substitute from Comchip Technology. It is the direct upgrade path for the obsolete DF1506ST-G and maintains full parametric equivalence.

Q: Can I mix different substitute parts in the same design?

A: Yes. All listed substitutes maintain identical voltage and current ratings, forward voltage characteristics, and operating temperature range. Physical compatibility is ensured across all options due to standardized 4-SMD Gull Wing packaging.

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