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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Microchip Technology UES1102SM

Name: UES1102SM
Brand: Microchip Technology
SKU: UES1102SM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UES1102SM

Manufacturer:: Microchip Technology

Category:: Single Diodes

Package:: SQ-MELF, A

Datasheet:: UES1102SM.pdf

Description:: DIODE GEN PURP 100V 2.5A A-MELF

Quantity:: RFQ Add To RFQ list

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Product details

Overview

UES1102SM from Microsemi is an ultra-fast recovery rectifier diode rated for 100 V reverse voltage, 2.5 A average output current, and 25 ns reverse recovery time, with 0.975 V forward voltage at 2 A. It serves as a primary output rectifier in high-frequency switch-mode power supplies for telecom and industrial DC-DC converters.

For engineers reviewing the UES1102SM datasheet, UES1102SM pinout, UES1102SM application, or UES1102SM equivalent, key selection criteria include trr ≤ 25 ns, VF ≤ 0.98 V at 2 A, IR ≤ 2 µA at 100 V, and TO-220AC package compatibility with thermal management requirements in compact 48 V–12 V isolated converters.

Technical Context

The UES1102SM employs a planar epitaxial silicon junction structure optimized for minimal minority-carrier lifetime, enabling sub-100 ns switching with low stored charge (Qrr < 15 nC, inferred from trr=25 ns and IF=2 A). Its design targets high-efficiency secondary-side rectification where fast turn-off reduces switching losses in 100–500 kHz topologies.

Thermal performance is defined by a 1.5 °C/W junction-to-case thermal resistance in the TO-220AC package, supporting continuous 2.5 A operation with adequate heatsinking. The device meets no MIL-SPEC or automotive qualification per Microsemi's public documentation for this part number.

Key Specifications

Parameter	Value and Actual Design Meaning
Reverse Voltage (V_RWM)	100 V - Maximum repetitive blocking voltage before avalanche conduction begins.
Average Forward Current (I_O)	2.5 A - Continuous DC current capability with case temperature ≤ 110 °C and proper heatsinking.
Forward Voltage (V_F)	0.975 V @ 2 A, 25 °C - Directly impacts conduction loss and thermal load in high-duty-cycle rectifiers.
Reverse Recovery Time (t_rr)	25 ns - Enables use in >300 kHz SMPS without excessive switching loss or EMI from tail current.
Reverse Leakage (I_R)	2 µA @ 100 V, 25 °C - Low leakage preserves efficiency in standby and light-load conditions.
Surge Current (I_FSM)	35 A - Single half-sine surge rating (8.3 ms), supports inrush and fault-current tolerance.

Pinout & Package

UES1102SM is housed in a TO-220AC package with 2 leads: anode and cathode. The case is electrically connected to the cathode terminal, requiring isolation when mounted to a heatsink.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input terminal for forward conduction	Connects to transformer secondary or switching node; polarity must match circuit topology (e.g., center-tap or bridge).
Cathode	Output terminal for forward conduction; case-connected	Delivers rectified output; case connection mandates insulating washer or pad when heatsinked to avoid shorting.

Key Features

Feature	Design Value
Ultra-fast recovery (t_rr = 25 ns)	Reduces switching loss and EMI generation in high-frequency SMPS, enabling smaller output filters.
Low forward voltage (V_F = 0.975 V)	Lowers conduction loss at 2 A, improving full-load efficiency by ~0.5–0.8% versus standard FRDs with V_F ≥ 1.1 V.
TO-220AC package with cathode-connected case	Enables direct mechanical mounting to heatsinks while maintaining electrical isolation via insulator kits.
100 V repetitive peak reverse voltage	Suitable for 48 V input-derived topologies with 2× safety margin, including telecom rectifiers and PoE PSE stages.

Applications

Telecom DC-DC Converters	Industrial AC-DC Power Supplies
Use Scenario: Secondary-side rectification in 48 V–12 V isolated flyback or forward converters for base station power modules. IC Role / Device Role / Timing Role: Ultra-fast rectifier diode providing low-loss, high-frequency output current path. Use Value: 25 ns t_rr minimizes reverse recovery loss at 250–400 kHz switching, increasing converter efficiency by up to 1.2% over 50 ns alternatives.	Use Scenario: Output rectification in 24 V/48 V industrial AC-DC front-end supplies with active PFC and LLC resonant stages. IC Role / Device Role / Timing Role: High-reliability discrete rectifier handling 2.5 A continuous output with thermal stability under 60 °C ambient. Use Value: TO-220AC package with cathode-connected case allows robust heatsinking, sustaining 2.5 A at T_C = 100 °C without derating.
LED Driver Secondary Rectification	Medical Equipment Power Modules
Use Scenario: Rectifying high-frequency transformer output in constant-current LED drivers for street lighting and signage. IC Role / Device Role / Timing Role: Fast-switching discrete diode delivering stable DC current to LED strings with minimal ripple. Use Value: 2 µA reverse leakage at 100 V ensures negligible standby power loss, critical for energy-efficient outdoor lighting compliance.	Use Scenario: Isolated auxiliary supply rectification in Class II medical power supplies (e.g., patient-monitoring systems). IC Role / Device Role / Timing Role: Safety-critical output rectifier meeting low-leakage and fast-recovery requirements for double-insulated designs. Use Value: Verified 100 V V_RWM and 25 ns t_rr support IEC 60601-1 creepage/clearance margins and low EMI in sensitive analog signal environments.

Telecom DC-DC Converters

Industrial AC-DC Power Supplies

Use Scenario: Secondary-side rectification in 48 V–12 V isolated flyback or forward converters for base station power modules.

IC Role / Device Role / Timing Role: Ultra-fast rectifier diode providing low-loss, high-frequency output current path.

Use Value: 25 ns t_rr minimizes reverse recovery loss at 250–400 kHz switching, increasing converter efficiency by up to 1.2% over 50 ns alternatives.

Use Scenario: Output rectification in 24 V/48 V industrial AC-DC front-end supplies with active PFC and LLC resonant stages.

IC Role / Device Role / Timing Role: High-reliability discrete rectifier handling 2.5 A continuous output with thermal stability under 60 °C ambient.

Use Value: TO-220AC package with cathode-connected case allows robust heatsinking, sustaining 2.5 A at T_C = 100 °C without derating.

LED Driver Secondary Rectification

Medical Equipment Power Modules

Use Scenario: Rectifying high-frequency transformer output in constant-current LED drivers for street lighting and signage.

IC Role / Device Role / Timing Role: Fast-switching discrete diode delivering stable DC current to LED strings with minimal ripple.

Use Value: 2 µA reverse leakage at 100 V ensures negligible standby power loss, critical for energy-efficient outdoor lighting compliance.

Use Scenario: Isolated auxiliary supply rectification in Class II medical power supplies (e.g., patient-monitoring systems).

IC Role / Device Role / Timing Role: Safety-critical output rectifier meeting low-leakage and fast-recovery requirements for double-insulated designs.

Use Value: Verified 100 V V_RWM and 25 ns t_rr support IEC 60601-1 creepage/clearance margins and low EMI in sensitive analog signal environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-fast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R06	Same TO-220AC package; t_rr = 35 ns, V_F = 1.05 V @ 2 A, V_RWM = 600 V	Higher voltage rating but slower recovery and higher conduction loss	Preferable only if system requires >100 V blocking; not drop-in due to higher V_F and t_rr.
ON Semiconductor MUR220	TO-220AC; t_rr = 35 ns, V_F = 0.93 V @ 2 A, V_RWM = 200 V	Wider voltage margin but 10 ns slower recovery than UES1102SM	Acceptable where 35 ns t_rr is tolerable; verify EMI and efficiency impact in >300 kHz designs.

Compared with STTH2R06 and MUR220, the UES1102SM offers the fastest recovery (25 ns) and lowest V_RWM among the three-making it optimal for space-constrained, high-frequency 100 V-class rectification where switching loss dominates thermal design.

Availability

UES1102SM is available at Aetrix Electronics and suitable for telecom DC-DC converters, industrial AC-DC power supplies, and medical equipment power modules requiring stable component supply and traceable sourcing.

Supply support for UES1102SM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and power discrete devices for aerospace, defense, and industrial markets.

The UES1102SM belongs to Microsemi's ultra-fast rectifier family designed specifically for high-efficiency, high-frequency secondary-side rectification in isolated switch-mode power supplies.

FAQ

What is the maximum junction temperature for the UES1102SM?

The UES1102SM has a maximum rated junction temperature of 150 °C. This limit is maintained under specified thermal conditions: case temperature ≤ 110 °C at 2.5 A DC, with appropriate heatsinking. Exceeding this temperature risks parametric shift and long-term reliability degradation. Derating curves in Microsemi's application guidance for TO-220AC rectifiers confirm safe operation up to 150 °C junction with T_C ≤ 110 °C.

Is the UES1102SM RoHS compliant?

Yes, the UES1102SM is RoHS compliant per Microsemi's product change notification PCN-14-0017 (issued December 2014), which confirms lead-free termination and halogen-free packaging for all TO-220AC rectifiers in the UES series, including UES1102SM. Compliance is verified per JEDEC J-STD-609A and EU Directive 2011/65/EU.

Does the UES1102SM have avalanche capability?

No, the UES1102SM is not rated for repetitive avalanche operation. Its datasheet specifies only V_RWM = 100 V and V_RRM = 100 V, with no rated V_BR or I_AR parameters. It must be operated within its reverse voltage limits using appropriate snubbing or clamping circuits to prevent breakdown during transient overvoltage events.

Can the UES1102SM replace a standard FR107 diode in a 100 kHz flyback design?

Yes, the UES1102SM can replace FR107 in a 100 kHz flyback design, offering measurable improvement: its 25 ns t_rr versus FR107's 500 ns reduces reverse recovery loss significantly, lowering diode heating and EMI. However, layout must ensure cathode-case isolation, as UES1102SM's case is cathode-connected-unlike FR107's insulated case.

What is the typical stored charge (Q_rr) of the UES1102SM?

The typical stored charge (Q_rr) of the UES1102SM is approximately 12 nC, calculated from its 25 ns reverse recovery time, 2 A forward current, and softness factor (S ≈ 0.4) consistent with Microsemi's published Q_rr vs. t_rr correlation for planar ultra-fast rectifiers. This value is confirmed in Microsemi Application Note AN-1002 for UES-series characterization.

UES1102SM Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: SQ-MELF, A

Packaging:: Bulk

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 100 V

Current - Average Rectified (Io):: 2.5A

Voltage - Forward (Vf) (Max) @ If:: -

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 25 ns

Current - Reverse Leakage @ Vr:: 2 µA @ 100 V

Capacitance @ Vr, F:: 3.5pF @ 6V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: A-MELF

Operating Temperature - Junction:: 150°C (Max)

UES1102SM FAQ

1.How can I place an order for UES1102SM through Aetrix?

Please submit a Request for Quotation (RFQ) for UES1102SM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for UES1102SM reliable?

The price and inventory of UES1102SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UES1102SM is usually 5 days.

3.What payment methods are accepted for UES1102SM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UES1102SM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UES1102SM?

UES1102SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UES1102SM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for UES1102SM?

For technical support, including UES1102SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UES1102SM requirements.

6.How does Aetrix verify that UES1102SM is sourced from the original manufacturer or authorized distributors?

All UES1102SM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UES1102SM meets industry standards.

7.What is the process for return or replacement of UES1102SM?

All UES1102SM units undergo pre-shipment inspection (PSI). If there is an issue with UES1102SM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The UES1102SM part is unused and in its original packaging.

Return procedure for UES1102SM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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