DF04ST-G Bridge Rectifier Single Phase 400V 1A Equivalent & Substitute Parts

Part Overview

The DF04ST-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 400V peak reverse voltage and 1A average rectified current in a 4-SMD surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design updates. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating different package variants and manufacturer options.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 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

Substitution of the DF04ST-G is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Peak Reverse (Max): 400 V (mandatory match)
Current - Average Rectified (Io): 1 A (mandatory match)
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A (mandatory match)
Operating Temperature Range: -55°C ~ 150°C (TJ) (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Package / Case: 4-SMD, Gull Wing (mandatory match)

Secondary Considerations:

Current - Reverse Leakage @ Vr: Acceptable range 2 µA to 10 µA @ 400 V
Product Status: Active status preferred for new designs; Not For New Designs acceptable for legacy support
RoHS and REACH compliance status
Supplier Device Package designation (DFS, ABS, DBS, DBLS, SDB-1, 4-SDIP)

All substitute parts listed maintain the core electrical specifications and physical form factor required for direct replacement in the DF04ST-G application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Temp Range	Package	Status
DF04ST-G	Comchip Technology	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Obsolete
DF04S-HF	Comchip Technology	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
ABS4-HF	Comchip Technology	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
ABS4U	SMC Diode Solutions	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
DB104S	MDD	400 V	41 mA	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
DBLS104G	Taiwan Semiconductor Corporation	400 V	1 A	1.1 V @ 1 A	2 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
DBLS104GH	Taiwan Semiconductor Corporation	400 V	1 A	1.1 V @ 1 A	2 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
DF04S-E3/77	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
DF04S1	onsemi	400 V	1 A	1.1 V @ 1 A	3 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Not For New Designs
DF04SA-E3/77	Vishay General Semiconductor - Diodes Division	400 V	1 A	1.1 V @ 1 A	5 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Active
SDB104-TP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	10 µA @ 400 V	-55°C ~ 150°C	4-SMD, Gull Wing	Not For New Designs

Engineering Selection Recommendations

Recommended Manufacturer Substitute (Active Status): DF04S-HF from Comchip Technology is the primary recommended substitute. It maintains identical electrical specifications to the DF04ST-G while offering active product status and equivalent inventory availability (729 pcs). This part is suitable for both legacy support and new design implementations.

Parametric Equivalents (Active Status):

ABS4-HF and ABS4U: Both rated for 400V, 1A with improved reverse leakage characteristics (5 µA vs. 10 µA). ABS4U from SMC Diode Solutions offers higher inventory (1127 pcs) and Tape & Reel packaging.
DBLS104G and DBLS104GH: Taiwan Semiconductor Corporation parts with superior reverse leakage performance (2 µA). DBLS104GH includes AEC-Q101 automotive qualification.
DF04S-E3/77 and DF04SA-E3/77: Vishay parts with active status and high inventory availability (38100 pcs and 2216 pcs respectively).

Legacy Support (Not For New Designs):

DF04S1 from onsemi and SDB104-TP from Micro Commercial Co maintain full electrical compatibility but are designated Not For New Designs. These are acceptable for sustaining production of existing designs.

Caution: DB104S from MDD specifies 41 mA average rectified current, which does not meet the 1A requirement of the DF04ST-G and is not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can I substitute DF04ST-G with any of the listed parts? A: No. DB104S is not suitable due to its 41 mA current rating. All other listed parts meet the mandatory electrical specifications (400V, 1A, 1.1V forward voltage, -55°C to 150°C operating range) and 4-SMD Gull Wing package requirement.

Q: What is the difference between parts marked "Active" and "Not For New Designs"? A: Active parts are currently in production and recommended for new designs. Parts marked "Not For New Designs" are still available but no longer recommended for new applications. Both categories are electrically compatible with DF04ST-G.

Q: Does reverse leakage current variation affect substitution? A: Reverse leakage specifications range from 2 µA to 10 µA across the substitute parts. All values remain within acceptable operating parameters for bridge rectifier applications. Lower leakage (2 µA) indicates superior performance characteristics.

Q: Are there packaging differences I should consider? A: All substitute parts use 4-SMD Gull Wing surface mount packaging, maintaining mechanical compatibility. Supplier Device Package designations (DFS, ABS, DBLS, SDB-1, 4-SDIP) are internal manufacturer classifications and do not affect PCB footprint compatibility.

Q: Which substitute offers the best inventory availability? A: DF04S-E3/77 from Vishay offers the highest inventory at 38100 pcs. ABS4U from SMC Diode Solutions provides 1127 pcs with Tape & Reel packaging.

Q: Is RoHS compliance maintained across all substitutes? A: All listed substitute parts are ROHS3 compliant, matching the DF04ST-G compliance status.

Q: Can I use DBLS104GH in automotive applications? A: DBLS104GH is qualified to AEC-Q101 automotive standards, making it suitable for automotive-grade applications requiring this certification.

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