DF04ST-HF Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DF04ST-HF is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 400 V peak reverse voltage and 1 A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The DF04ST-HF is packaged in a 4-SMD Gull Wing surface mount configuration (DFS package) and operates across a temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Current - Reverse Leakage @ Vr	10 µA @ 400 V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing

Substitute Part Grouping Explanation

Substitution of the DF04ST-HF is determined by matching the following critical parameters:

Primary Matching Criteria:

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

Substitute parts are grouped into two categories:

Manufacturer Recommended Substitute: DF04S-HF represents the direct replacement from Comchip Technology with active product status, maintaining identical electrical specifications and package configuration.

Parametric Equivalents: Parts including ABS4-HF, DF04ST-G, ABS4U, DB104S, DBLS104G, DBLS104GH, DF04S-E3/77, DF04S1, and DF04SA-E3/77 meet all critical electrical parameters and physical mounting requirements. These parts originate from multiple manufacturers (Comchip Technology, SMC Diode Solutions, MDD, Taiwan Semiconductor Corporation, Vishay General Semiconductor, and onsemi) and carry active product status with the exception of DF04ST-G and DF04S1, which are obsolete or not recommended for new designs respectively.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Temp Range	Package	Product Status
DF04ST-HF	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
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
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

Engineering Selection Recommendations

Primary Recommendation: DF04S-HF is the manufacturer-recommended substitute from Comchip Technology. This part maintains identical electrical specifications and package configuration while carrying active product status, ensuring long-term availability and supply chain continuity.

Alternative Selections Based on Product Status:

For applications requiring active product status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1), the following parts are suitable:

ABS4-HF (Comchip Technology): Active status with improved reverse leakage characteristics (5 µA vs. 10 µA).
ABS4U (SMC Diode Solutions): Active status, Tape & Reel packaging, improved reverse leakage (5 µA), REACH Affected designation.
DBLS104G and DBLS104GH (Taiwan Semiconductor Corporation): Active status with superior reverse leakage performance (2 µA). DBLS104GH includes automotive-grade qualification (AEC-Q101).
DF04S-E3/77 and DF04SA-E3/77 (Vishay General Semiconductor): Active status, Tape & Reel packaging, improved reverse leakage (5 µA), highest inventory availability (38,100 pcs).

Parts to Avoid for New Designs:

DF04ST-G: Obsolete status.
DF04S1: Not recommended for new designs.
DB104S: Current rating of 41 mA does not meet the 1 A specification.

Frequently Asked Questions (FAQ)

Q: Can DF04S-HF directly replace DF04ST-HF without circuit modification?

A: Yes. DF04S-HF maintains identical electrical specifications (400 V peak reverse voltage, 1 A average rectified current, 1.1 V forward voltage drop) and physical package configuration (4-SMD Gull Wing). No circuit modifications are required.

Q: What is the difference between parts with different reverse leakage specifications?

A: Reverse leakage current (Ir) varies among substitutes: DF04ST-HF and DF04ST-G specify 10 µA @ 400 V, while ABS4-HF, ABS4U, DF04S-E3/77, and DF04SA-E3/77 specify 5 µA @ 400 V. DBLS104G and DBLS104GH specify 2 µA @ 400 V. Lower reverse leakage indicates improved performance characteristics. All values remain within acceptable operating parameters for standard bridge rectifier applications.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance designation. The original DF04ST-HF does not specify RoHS status in the provided data.

Q: What is the significance of the DBLS104GH automotive qualification?

A: DBLS104GH carries AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and quality standards. This part is suitable for automotive applications requiring enhanced qualification documentation.

Q: Why does DB104S appear in the substitute list despite a 41 mA current rating?

A: DB104S does not meet the 1 A average rectified current specification of the DF04ST-HF. This part should not be selected as a substitute for applications requiring 1 A current capacity.

Q: What packaging options are available for substitute parts?

A: Most substitute parts are supplied in standard packaging. DF04S-E3/77, DF04S1, DF04SA-E3/77, ABS4U, DBLS104G, and DBLS104GH are available in Tape & Reel (TR) packaging, suitable for automated assembly processes. Comchip Technology parts (DF04S-HF, ABS4-HF, DF04ST-G) and MDD DB104S do not specify packaging type in the provided data.

Q: Is DF04S1 suitable for new product designs?

A: No. DF04S1 carries a "Not For New Designs" product status designation. While electrically compatible, this part should not be selected for new design implementations. Use DF04S-HF or other active-status alternatives instead.

Q: What is the inventory availability for substitute parts?

A: Inventory levels vary significantly. DF04S-E3/77 (Vishay) offers the highest availability at 38,100 pcs. ABS4U (SMC Diode Solutions) provides 1,127 pcs. DB104S (MDD) offers 7,347 pcs. Comchip Technology parts range from 707 to 882 pcs. Taiwan Semiconductor Corporation DBLS parts provide 3,483 to 3,769 pcs.

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