UH1D-M3/5AT Equivalent & Substitute Parts

Part Overview

The UH1D-M3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 200 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The diode features fast recovery characteristics with a reverse recovery time of 30 ns and operates across a junction temperature range of -55°C to 150°C. Identification of compatible alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 1 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	1	µA @ 200 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AC, SMA	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the UH1D-M3/5AT is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 900 mV to 1.05 V @ 1 A
Reverse Recovery Time (trr): Acceptable range 15.2 ns to 50 ns
Current - Reverse Leakage @ Vr: Acceptable range 1 µA to 10 µA @ 200 V
Operating Temperature - Junction (Max): Acceptable at 150°C or higher
RoHS Status: ROHS3 Compliant required
Moisture Sensitivity Level (MSL): 1 (Unlimited) required

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (same manufacturer, active status), Parametric Equivalents (same base manufacturer, automotive-qualified variants), and Cross-Manufacturer Alternatives (different manufacturers, equivalent electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns]	Ir @ 200V [µA]	Tj (Max) [°C]	Product Status
UH1D-M3/5AT	Vishay	200	1	1.05	30	1	150	Obsolete
VS-1EMH02-M3/5AT	Vishay	200	1	0.90	15.2	2	175	Active
UH1DHE3_A/I	Vishay	200	1	1.05	25	1	150	Active
CSFA103-G	Comchip Technology	200	1	0.95	35	5	150	Active
CURA103-G	Comchip Technology	200	1	1.00	50	5	150	Active
EGF1D	onsemi	200	1	1.00	50	10	175	Not For New Designs
ES1D	EVVO Semi	200	1	1.00	35	5	150	Active
ES1D-13-F	Diodes Incorporated	200	1	0.92	25	5	150	Active
ES1D-LTP	Micro Commercial Co	200	1	0.95	35	5	175	Active
GF1D	Fairchild Semiconductor	200	1	1.00	2000	5	175	Active
S1D	YAGEO	-	-	-	-	-	-	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Manufacturer Equivalent:

VS-1EMH02-M3/5AT (Vishay) is the preferred direct substitute. This part maintains identical voltage and current ratings, operates at an extended maximum junction temperature of 175°C (versus 150°C), and features improved reverse recovery time of 15.2 ns. The part is active in production status with ROHS3 compliance and MSL 1 rating. Forward voltage is reduced to 900 mV, providing lower power dissipation characteristics.

Secondary Recommendation - Parametric Equivalent:

UH1DHE3_A/I (Vishay) provides an automotive-qualified alternative with AEC-Q101 certification. This part matches the original forward voltage specification of 1.05 V and reverse leakage current of 1 µA, with a reverse recovery time of 25 ns. The part is active in production and maintains identical operating temperature range to the original.

Cross-Manufacturer Alternatives:

ES1D-13-F (Diodes Incorporated) and ES1D-LTP (Micro Commercial Co) are active alternatives with fast recovery characteristics. ES1D-13-F offers reduced forward voltage of 920 mV and fast recovery time of 25 ns. ES1D-LTP extends the maximum junction temperature to 175°C while maintaining 950 mV forward voltage and 35 ns recovery time.

CSFA103-G (Comchip Technology) and CURA103-G (Comchip Technology) are active alternatives with equivalent electrical specifications within allowable parameter ranges.

Not Recommended:

EGF1D (onsemi) carries a "Not For New Designs" status and should not be selected for new applications.

GF1D (Fairchild Semiconductor) exhibits standard recovery characteristics (2 µs reverse recovery time) rather than fast recovery, making it unsuitable for fast recovery applications.

Frequently Asked Questions (FAQ)

Q: Can VS-1EMH02-M3/5AT directly replace UH1D-M3/5AT in existing designs?

A: Yes. VS-1EMH02-M3/5AT meets all mandatory electrical parameters: 200 V reverse voltage, 1 A average rectified current, fast recovery ≤ 500 ns, and DO-214AC surface mount package. The improved reverse recovery time of 15.2 ns and extended temperature rating to 175°C provide enhanced performance characteristics.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Fast recovery diodes have reverse recovery times ≤ 500 ns, while standard recovery diodes exceed 500 ns. The UH1D-M3/5AT requires fast recovery classification. GF1D exhibits 2 µs recovery time and is therefore not a suitable substitute.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts carry ROHS3 Compliant status. Compliance verification is required for any part selection outside this list.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed substitutes maintain MSL 1 rating, ensuring equivalent handling and storage procedures.

Q: Can parts with different forward voltage specifications be interchanged?

A: Forward voltage variations within the range 900 mV to 1.05 V @ 1 A are acceptable substitutions. Lower forward voltage reduces power dissipation; higher forward voltage increases dissipation. Circuit design must accommodate the selected part's forward voltage characteristics.

Q: Is automotive qualification required for this application?

A: Automotive qualification is not mandatory unless specified by application requirements. UH1DHE3_A/I provides AEC-Q101 certification for applications requiring automotive-grade components.

Q: What packaging options are available?

A: All substitute parts use DO-214AC (SMA) surface mount package, matching the original UH1D-M3/5AT package specification. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging options are available depending on supplier and part number variant.

Q: How does reverse recovery time affect circuit performance?

A: Shorter reverse recovery time reduces switching losses and improves efficiency in high-frequency applications. VS-1EMH02-M3/5AT (15.2 ns) and ES1D-13-F (25 ns) provide faster recovery than the original 30 ns specification.

Q: Are there inventory considerations for part selection?

A: Inventory levels vary by part and supplier. VS-1EMH02-M3/5AT maintains 15,716 pieces in stock, while ES1D-13-F maintains 550,400 pieces. Availability should be verified with component suppliers for production requirements.

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