US3DB-HF Equivalent & Substitute Parts

Part Overview

The US3DB-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 200 V DC reverse voltage and 3 A average rectified current in a surface mount SMB/DO-214AA package. This diode is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the same application parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the US3DB-HF are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 1 V @ 3 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount
Package / Case: DO-214AA, SMB
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Secondary Parameters (Allowable Variation):

Reverse Recovery Time (trr): 35 ns to 50 ns
Current - Reverse Leakage @ Vr: 5 µA to 100 µA @ 200 V
Capacitance @ Vr, F: 45 pF to 80 pF @ 4V, 1MHz (where specified)
Packaging Format: Tape & Reel (TR) or Cut Tape (CT)

All substitute parts maintain electrical equivalence within the specified parameter ranges and are packaged in the same DO-214AA/SMB form factor, ensuring mechanical and thermal compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Packaging Format	Product Status
US3DB-HF	Comchip Technology	200	3	1 @ 3 A	50	5 @ 200 V	DO-214AA, SMB	Tape & Reel (TR)	Active
ES3DB-HF	Comchip Technology	200	3	1 @ 3 A	35	5 @ 200 V	DO-214AA, SMB	Tape & Reel (TR)	Active
ES3DB	MDD	200	3	1 @ 3 A	35	5 @ 200 V	DO-214AA, SMB	Tape & Reel (TR)	Active
ES3DB R5G	Taiwan Semiconductor Corporation	200	3	1 @ 3 A	35	10 @ 200 V	DO-214AA, SMB	Cut Tape (CT)	Discontinued at DiGi Electronics
ES3DBHR5G	Taiwan Semiconductor Corporation	200	3	1 @ 3 A	35	100 @ 200 V	DO-214AA, SMB	Cut Tape (CT)	Active
HS3DB	Taiwan Semiconductor Corporation	200	3	1 @ 3 A	50	10 @ 200 V	DO-214AA, SMB	Tape & Reel (TR)	Active
HS3DB R5G	Taiwan Semiconductor Corporation	200	3	1 @ 3 A	50	10 @ 200 V	DO-214AA, SMB	Cut Tape (CT)	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Primary Substitutes (Active Status, Tape & Reel Packaging):

ES3DB-HF and ES3DB are the preferred substitutes for the US3DB-HF. Both parts maintain Active product status and are supplied in Tape & Reel format, matching the original packaging specification. ES3DB-HF is manufactured by Comchip Technology, the same manufacturer as the primary part, ensuring consistency in manufacturing processes and quality standards. ES3DB, manufactured by MDD, provides an alternative source while maintaining identical electrical specifications.

Secondary Substitutes (Active Status, Cut Tape Packaging):

ES3DBHR5G and HS3DB are Active products suitable for applications where Cut Tape packaging is acceptable. ES3DBHR5G exhibits higher reverse leakage current (100 µA @ 200 V) compared to the primary part (5 µA @ 200 V), which may impact applications sensitive to leakage characteristics. HS3DB maintains reverse leakage current at 10 µA @ 200 V and is available in Tape & Reel format.

Discontinued Products:

ES3DB R5G and HS3DB R5G are listed as Discontinued at DiGi Electronics and should be considered only when supply chain constraints require extended lead times or when existing inventory is available through alternative distribution channels.

Compliance Considerations:

All substitute parts are ROHS3 compliant and operate within the -55°C to 150°C junction temperature range, meeting the environmental and regulatory requirements of the original specification.

Frequently Asked Questions (FAQ)

Q: Can ES3DB-HF be used as a direct replacement for US3DB-HF?

A: Yes. ES3DB-HF meets all primary electrical parameters: 200 V reverse voltage, 3 A average rectified current, 1 V forward voltage at 3 A, and fast recovery speed classification. Both parts are supplied in Tape & Reel packaging and are ROHS3 compliant. The reverse recovery time of ES3DB-HF (35 ns) is faster than US3DB-HF (50 ns), which is within acceptable substitution parameters.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for automated assembly processes. Cut Tape (CT) packaging supplies components on tape segments cut to specific lengths, typically used for manual assembly or lower-volume applications. Both formats contain the same component in the DO-214AA/SMB package.

Q: Why does ES3DBHR5G have higher reverse leakage current?

A: Reverse leakage current (Ir) is a parameter that varies within manufacturing tolerances and design specifications. ES3DBHR5G specifies 100 µA @ 200 V compared to 5 µA @ 200 V for US3DB-HF. This difference is within the allowable range for general-purpose rectifier diodes and does not affect the primary rectification function. Applications sensitive to leakage current should select parts with lower Ir specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting the same environmental and regulatory standards as the US3DB-HF.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time is the interval required for a diode to switch from forward conduction to reverse blocking after the applied voltage reverses. US3DB-HF specifies 50 ns, while ES3DB-HF, ES3DB, ES3DB R5G, and ES3DBHR5G specify 35 ns. Faster recovery times reduce switching losses in high-frequency applications. Both specifications are within the fast recovery classification (≤ 500 ns).

Q: Can I substitute a discontinued part?

A: Discontinued parts (ES3DB R5G and HS3DB R5G) are no longer actively produced or distributed through primary channels. Substitution with Active status parts is recommended to ensure long-term supply availability and consistent product support.

Q: What operating temperature range applies to all substitute parts?

A: All substitute parts operate within the junction temperature range of -55°C to 150°C, matching the original US3DB-HF specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message