UH3D-M3/9AT Equivalent & Substitute Parts

Part Overview

The UH3D-M3/9AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 200 V DC reverse voltage and 2.5 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

The primary reason for identifying substitutes is the obsolete product status. Active alternatives with equivalent or superior electrical characteristics are available from multiple manufacturers and can be directly integrated into existing designs without circuit modification, provided they meet the required voltage, current, and thermal specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	2.5	A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	40	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the UH3D-M3/9AT is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
Package / Case: Must be DO-214AB (SMC) for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant
Moisture Sensitivity Level: Must be 1 (Unlimited) or equivalent

Current Rating Consideration: The UH3D-M3/9AT is rated for 2.5 A average rectified current. Substitute parts rated at 3 A or higher satisfy this requirement, as higher current ratings provide operational margin. Parts rated below 2.5 A are not acceptable substitutes.

Speed and Recovery Characteristics: The main part specifies Fast Recovery (≤ 500ns, > 200mA) with a reverse recovery time of 40 ns. Substitute parts must meet or exceed these speed classifications to ensure compatibility in switching applications.

Temperature Range: The operating junction temperature range of -55°C to 175°C establishes the baseline. Substitute parts with equal or wider temperature ranges are acceptable.

Substitutes are grouped into two categories: Vishay direct equivalents (same manufacturer, active status) and cross-manufacturer alternatives (Comchip Technology, Micro Commercial Co, Diotec Semiconductor, Diodes Incorporated, onsemi) that meet all specified parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [V]	Speed	trr [ns]	Ir @ 200V [µA]	Package	Tj (°C)	Product Status
UH3D-M3/9AT	Vishay	200	2.5	1.05	Fast Recovery ≤ 500ns	40	5	DO-214AB	-55 to 175	Obsolete
VS-3ECH02-M3/9AT	Vishay	200	3	0.9	Standard Recovery > 500ns	—	2	DO-214AB	-55 to 175	Active
UH3DHE3_A/H	Vishay	200	3	1.05	Fast Recovery ≤ 500ns	40	5	DO-214AB	-55 to 175	Active
UH3DHE3_A/I	Vishay	200	3	1.05	Fast Recovery ≤ 500ns	40	5	DO-214AB	-55 to 175	Active
CSFC303-G	Comchip Technology	200	3	0.95	Fast Recovery ≤ 500ns	35	5	DO-214AB	-55 to 150	Active
CURC303-G	Comchip Technology	200	3	1.0	Fast Recovery ≤ 500ns	50	5	DO-214AB	-55 to 150	Active
ER3D-TP	Micro Commercial Co	200	3	0.95	Fast Recovery ≤ 500ns	35	5	DO-214AB	-50 to 175	Active
ES3D	Diotec Semiconductor	200	3	0.9	Fast Recovery ≤ 500ns	20	5	DO-214AB	-50 to 150	Active
ES3D-13-F	Diodes Incorporated	200	3	0.9	Fast Recovery ≤ 500ns	25	10	DO-214AB	-55 to 150	Active
MURS320-13-F	Diodes Incorporated	200	3	0.875	Fast Recovery ≤ 500ns	25	5	DO-214AB	-65 to 175	Active
MURS320T3G	onsemi	200	3	0.875	Fast Recovery ≤ 500ns	35	5	DO-214AB	-65 to 175	Active

Engineering Selection Recommendations

Primary Recommendation - Vishay Direct Equivalents:

The UH3DHE3_A/H and UH3DHE3_A/I are the preferred substitutes. Both are manufactured by Vishay (the original manufacturer), maintain identical voltage and temperature specifications, and provide superior current rating (3 A versus 2.5 A). These parts feature identical forward voltage characteristics (1.05 V @ 3 A) and reverse recovery time (40 ns), ensuring direct functional equivalence. Both parts are AEC-Q101 qualified for automotive applications and carry active product status. The UH3DHE3_A/I includes Tape & Reel packaging, which is standard for production environments.

Secondary Recommendation - Cross-Manufacturer Alternatives:

For applications where Vishay parts are unavailable, the following alternatives provide full electrical compatibility:

MURS320-13-F and MURS320T3G (onsemi): Both offer superior forward voltage characteristics (0.875 V @ 3 A) and extended temperature range (-65°C to 175°C). The MURS320T3G provides faster reverse recovery (35 ns) and is available in Cut Tape & Digi-Reel packaging.
ES3D-13-F (Diodes Incorporated): Provides excellent reverse recovery time (25 ns) and is available in high inventory. Operating temperature range is -55°C to 150°C.
ER3D-TP (Micro Commercial Co): Offers the highest inventory availability (16,840 pcs) with fast recovery characteristics (35 ns trr) and extended upper temperature limit (175°C).
ES3D (Diotec Semiconductor): Provides the fastest reverse recovery time (20 ns) among all substitutes, supporting high-frequency switching applications.

Compliance Verification:

All recommended substitutes are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original part specifications. All parts are rated for -55°C minimum junction temperature or lower, satisfying thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 3 A rated diode as a substitute for the 2.5 A UH3D-M3/9AT?

A: Yes. A 3 A rated diode exceeds the current requirement of 2.5 A and provides operational margin. The higher current rating does not create compatibility issues; it only increases the part's capability. All recommended substitutes are rated for 3 A.

Q: What is the significance of reverse recovery time (trr) in selecting a substitute?

A: Reverse recovery time determines switching speed and is critical in high-frequency applications. The UH3D-M3/9AT specifies 40 ns. Substitutes with equal or faster recovery times (20–35 ns) are fully compatible. The CURC303-G at 50 ns is slightly slower but remains within acceptable fast recovery classification (≤ 500ns).

Q: Are all substitutes available in the same DO-214AB package?

A: Yes. All recommended substitutes use the DO-214AB (SMC) package, ensuring mechanical and thermal compatibility. Packaging format (Tape & Reel, Cut Tape, or bulk) varies by manufacturer and supplier but does not affect electrical performance.

Q: Why is the UH3DHE3_A/H recommended over VS-3ECH02-M3/9AT?

A: The UH3DHE3_A/H maintains identical forward voltage (1.05 V @ 3 A) and reverse recovery time (40 ns) as the original UH3D-M3/9AT, providing true parametric equivalence. The VS-3ECH02-M3/9AT uses standard recovery (> 500ns) rather than fast recovery, making it less suitable for applications requiring fast switching characteristics.

Q: Can I substitute parts with different operating temperature ranges?

A: Substitutes with equal or wider temperature ranges are acceptable. The UH3D-M3/9AT operates from -55°C to 175°C. Parts like MURS320-13-F and MURS320T3G (-65°C to 175°C) provide extended low-temperature capability. Parts with narrower ranges (e.g., -50°C to 150°C) are acceptable only if your application does not require the full original temperature range.

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

A: Fast recovery diodes (≤ 500ns trr) switch off more quickly, reducing switching losses and enabling higher-frequency operation. Standard recovery diodes (> 500ns trr) are suitable for lower-frequency applications. The UH3D-M3/9AT is a fast recovery device; substitutes should maintain this classification unless application requirements explicitly permit standard recovery operation.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly. ES3D (Diotec) has 131,200 pcs available, while ER3D-TP (Micro Commercial Co) has 16,840 pcs. For high-volume production, parts with larger inventory provide supply security. For prototype or low-volume applications, any active substitute with adequate stock is suitable.

Q: Do all substitutes meet RoHS3 compliance?

A: Yes. All recommended substitutes are explicitly marked as ROHS3 compliant, matching the original part specification. This ensures compatibility with environmental and regulatory requirements.

Q: What is MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All recommended substitutes carry this rating, eliminating moisture-related reliability concerns.

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