UES1102 Equivalent & Substitute Parts

Part Overview

The UES1102 is a general-purpose rectifier diode manufactured by Microchip Technology, rated for 100 V DC reverse voltage and 2 A average rectified current. The device features fast recovery characteristics with a reverse recovery time of 25 ns and is housed in an A-series axial through-hole package. This component is currently in active production status with 1013 pieces available in inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the operational constraints of the application circuit, accounting for differences in voltage rating, current capacity, and thermal characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 2 A	mV
Reverse Recovery Time (trr)	25	ns
Current - Reverse Leakage @ Vr	2	µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	-
Mounting Type	Through Hole	-
Package / Case	A, Axial	-
Operating Temperature - Junction	-55 to 175	°C

Substitute Part Grouping Explanation

Substitution of the UES1102 is determined by the following electrical and mechanical criteria:

Mandatory Compatibility Parameters:

Voltage rating must equal or exceed 100 V DC reverse voltage
Current rating must equal or exceed 2 A average rectified current
Speed classification must be Fast Recovery (≤ 500ns, > 200mA)
Mounting type must be Through Hole
Package configuration must be axial

Acceptable Variation Parameters:

Forward voltage drop may vary within typical application tolerances
Reverse recovery time may be longer than the original specification
Reverse leakage current may be higher at the rated voltage
Operating temperature range may differ

The STTH302 meets all mandatory compatibility parameters while providing enhanced electrical ratings in voltage and current capacity, making it suitable for applications where the UES1102 is specified.

Parameter Comparison

Parameter	UES1102 (Microchip)	STTH302 (STMicroelectronics)	Unit
Voltage - DC Reverse (Vr) (Max)	100	200	V
Current - Average Rectified (Io)	2	3	A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 2 A	950 mV @ 3 A	mV
Reverse Recovery Time (trr)	25	35	ns
Current - Reverse Leakage @ Vr	2 µA @ 100 V	3 µA @ 200 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	-
Mounting Type	Through Hole	Through Hole	-
Package / Case	A, Axial	DO-201AD, Axial	-
Operating Temperature - Junction (Max)	175	175	°C
Product Status	Active	Active	-
RoHS Status	RoHS non-compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

UES1102 Selection Criteria:

Applications requiring 100 V reverse voltage rating with 2 A current capacity
Circuits where the original part number is specified in design documentation
Systems where RoHS non-compliant components are acceptable

STTH302 Selection Criteria:

Applications requiring higher voltage margin (200 V rating) or higher current capacity (3 A rating)
New designs or redesigns where RoHS3 compliance is required
Circuits where enhanced electrical ratings provide design flexibility without performance degradation
Systems where the DO-201AD axial package is mechanically compatible with the A-series footprint

Both devices are active production components with established supply availability. The STTH302 provides superior compliance status through ROHS3 certification while maintaining fast recovery characteristics and through-hole axial mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can the STTH302 directly replace the UES1102 in existing circuit boards?

A: The STTH302 features an axial through-hole package (DO-201AD) that is mechanically compatible with A-series axial footprints. Physical lead spacing and diameter must be verified against the PCB layout before substitution. Both devices are rated for the same maximum junction temperature (175°C).

Q: What is the significance of the voltage rating difference between these parts?

A: The UES1102 is rated for 100 V DC reverse voltage, while the STTH302 is rated for 200 V. In applications operating at or below 100 V, the STTH302 provides additional voltage margin. The higher rating does not degrade performance in lower-voltage circuits.

Q: How do the forward voltage characteristics compare?

A: The UES1102 exhibits 975 mV forward voltage drop at 2 A, while the STTH302 exhibits 950 mV at 3 A. At the UES1102 operating point (2 A), the STTH302 forward voltage drop is lower, resulting in reduced power dissipation.

Q: What is the impact of the 10 ns difference in reverse recovery time?

A: The UES1102 has a reverse recovery time of 25 ns, while the STTH302 has 35 ns. Both devices meet the fast recovery classification (≤ 500ns, > 200mA). The difference is negligible in most general-purpose rectification applications operating below 500 kHz switching frequencies.

Q: Does RoHS compliance affect electrical performance?

A: RoHS3 compliance in the STTH302 reflects manufacturing process changes but does not alter the electrical performance specifications. Both devices operate identically within their rated parameters.

Q: Are there inventory considerations for substitution?

A: The UES1102 has 1013 pieces in stock, while the STTH302 has 1580 pieces available. Both components are in active production with established supply chains.

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