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

Diodes Incorporated UF1501S-B

Name: UF1501S-B
Brand: Diodes Incorporated
SKU: UF1501S-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF1501S-B

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: UF1501S-B.pdf

Description:: DIODE GEN PURP 50V 1.5A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:9,988

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Product details

Overview

UF1501S-B from Diodes Incorporated is a 1.5A ultra-fast recovery rectifier diode in DO-41 package, rated for 50V peak repetitive reverse voltage (V_RRM), 1.0V forward voltage at 1.5A (V_FM), and 50ns reverse recovery time (t_rr). It serves as primary-side AC/DC input rectifier in compact offline switch-mode power supplies.

For engineers reviewing the UF1501S-B datasheet, UF1501S-B pinout, UF1501S-B application, or UF1501S-B equivalent, key selection criteria include V_RRM, t_rr, I_O, thermal resistance (R_θJA = 70°C/W), and DO-41 mechanical compatibility in space-constrained PCB layouts.

Technical Context

This discrete silicon PN junction diode uses diffused junction technology to achieve ultra-fast switching with low stored charge. Its 50ns reverse recovery time enables high-frequency operation up to 100kHz in flyback and forward converters without excessive switching loss.

The device sustains 50A non-repetitive surge current (I_FSM) under 8.3ms half-sine conditions and exhibits only 5.0µA peak reverse leakage (I_RM) at 25°C and rated 50V blocking, supporting reliable performance in thermally demanding environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum peak reverse voltage before breakdown; defines safe AC input voltage headroom in bridge or single-diode rectification.
I_O	1.5 A - Average forward current at T_A = 50°C; sets continuous power handling capability with standard lead heatsinking.
t_rr	50 ns - Reverse recovery time measured at I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A; enables efficient high-frequency switching with minimal turn-off loss.
V_FM	1.0 V @ 1.5A - Forward voltage drop at rated DC output current; directly determines conduction loss and thermal load in rectifier stage.
R_θJA	70 °C/W - Junction-to-ambient thermal resistance; used with power dissipation to calculate worst-case junction temperature on standard FR-4 PCB.
I_FSM	50 A - Non-repetitive surge rating; ensures robustness against line transients and inrush currents during cold start.
I_RM	5.0 µA @ 25°C - Peak reverse leakage at full rated DC blocking voltage; critical for low-power standby efficiency and voltage hold-up stability.

Pinout & Package

DO-41 molded plastic package with axial leads; cathode identified by band marking; weight ≈ 0.35 g; UL 94V-0 flammability rating; moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC input or transformer secondary; must withstand full surge current and reverse voltage stress.
Cathode	Forward current exit point	Connected to bulk capacitor or switching node; polarity band identifies this terminal for correct PCB placement.

Key Features

Feature	Design Value
Ultra-fast recovery (50ns)	Reduces switching loss and EMI generation in 50–100kHz SMPS designs compared to standard rectifiers (>500ns).
50V V_RRM rating	Suitable for universal-input (85–265V_AC) offline adapters where peak rectified voltage remains below 40V.
Low 1.0V V_FM at 1.5A	Limits conduction loss to ≤1.5W at full load, easing thermal management on compact PCBs without heatsinks.
50A I_FSM surge rating	Withstands repeated cold-start surges and lightning-induced line transients without degradation in consumer-grade power supplies.

Applications

AC/DC Adapter Input Rectification

USB Wall Charger Output Stage

Use Scenario: Single-phase, half-wave rectification of 120/230V_AC input feeding a 12V/1.5A flyback converter.

IC Role / Device Role / Timing Role: Primary-side unidirectional current valve converting AC to pulsating DC; operates at line frequency but must tolerate high dv/dt during zero-crossing.

Use Value: 50ns t_rr prevents reverse conduction overlap during rapid voltage reversal, minimizing RMS current stress and audible noise.

Use Scenario: Secondary-side synchronous rectification replacement in low-cost 5V/2A USB chargers using quasi-resonant topology.

IC Role / Device Role / Timing Role: Freewheeling diode clamping transformer reset energy; conducts only during off-time with fast voltage reversal.

Use Value: Low 1.0V V_FM reduces conduction loss by ~15% versus UF1502S, improving light-load efficiency and reducing thermal footprint.

Industrial Sensor Power Supply

LED Driver Bulk Rectification

Use Scenario: Compact 24V DC power module for field-mounted analog sensors in factory automation cabinets.

IC Role / Device Role / Timing Role: Input rectifier in isolated capacitive-dropper or small transformer-based supply; exposed to ambient temperatures up to +70°C.

Use Value: 5.0µA I_RM at 25°C and low R_θJA ensure stable no-load regulation and <100mW self-heating under continuous operation.

Use Scenario: High-reliability bulk rectifier in outdoor-rated LED streetlight drivers operating at 105°C ambient.

IC Role / Device Role / Timing Role: First-stage rectifier in two-stage PFC + buck configuration; subjected to high line surges and thermal cycling.

Use Value: 50A I_FSM rating and -65°C to +150°C operating range support >50,000-hour lifetime in harsh outdoor 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
STTH1L06U	V_RRM = 600V, t_rr = 35ns, I_O = 1.0A, SOD-123FL package	Higher voltage rating but lower current; surface-mount only; unsuitable for through-hole DO-41 layouts.	Select when board space is constrained and 600V isolation is required; requires rework of footprint and thermal design.
1N4933	V_RRM = 200V, t_rr = 200ns, I_O = 1.5A, DO-41 package	Slower recovery (200ns vs. 50ns); higher V_FM (1.3V); same footprint but higher switching loss.	Select only for low-frequency (<20kHz), cost-sensitive applications where efficiency and EMI are secondary.

Compared with STTH1L06U and 1N4933, UF1501S-B uniquely balances 50V rating, 50ns speed, 1.5A current, and DO-41 through-hole compatibility-making it optimal for cost-sensitive, space-limited, universal-input AC/DC adapters requiring proven manufacturability and thermal margin.

Availability

UF1501S-B is available at Aetrix Electronics and suitable for AC/DC adapters, USB wall chargers, industrial sensor power supplies, and LED driver bulk rectification requiring stable component supply and long-term production continuity.

Supply support for UF1501S-B 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The UF150xS series belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-efficiency, high-reliability AC/DC conversion in consumer, industrial, and lighting power supplies.

FAQ

What is the maximum allowable junction temperature for UF1501S-B?

The absolute maximum junction temperature (T_J) is +150°C, as specified in the Thermal Characteristics table. Operation above this limit risks permanent parametric shift or catastrophic failure. Derating curves in Figure 1 confirm 1.5A average current is valid only up to 50°C ambient; at 70°C ambient, maximum continuous current drops to ~1.1A assuming standard DO-41 PCB mounting.

Can UF1501S-B replace UF1502S in a 100V-rated circuit?

No. UF1501S-B has a 50V V_RRM rating and is not rated for 100V circuits. Substituting it for UF1502S (100V V_RRM) risks reverse breakdown during normal operation or transient overvoltage events. The devices share identical package and thermal specs but differ fundamentally in voltage capability-replacement requires validation of peak reverse stress across all operating conditions.

Is UF1501S-B suitable for use in automotive applications?

UF1501S-B is not AEC-Q101 qualified and lacks automotive-specific screening (e.g., HTOL, temperature cycling). While its -65°C to +150°C operating range meets some under-hood temperature requirements, Diodes Incorporated does not endorse or guarantee its use in automotive safety-critical systems. For automotive applications, select AEC-Q101-certified alternatives such as the DFLS160Q or SB160.

How does the DO-41 package affect thermal performance in high-density layouts?

The DO-41 package has R_θJA = 70°C/W on standard FR-4 with 9.5mm lead length, meaning 1.5W dissipation raises junction temperature by 105°C above ambient. In high-density layouts, reduced copper area and airflow increase effective R_θJA; thermal simulation or IR imaging is recommended. Adding 10mm² of 1oz copper pad per lead can reduce R_θJA by ~15°C/W, improving reliability at full load.

UF1501S-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Bulk

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 1.5A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 1.5 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 50 V

Capacitance @ Vr, F:: 35pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

Operating Temperature - Junction:: -65°C ~ 150°C

UF1501S-B FAQ

1.How can I place an order for UF1501S-B through Aetrix?

Please submit a Request for Quotation (RFQ) for UF1501S-B 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 UF1501S-B reliable?

The price and inventory of UF1501S-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF1501S-B is usually 5 days.

3.What payment methods are accepted for UF1501S-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF1501S-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF1501S-B?

UF1501S-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF1501S-B 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 UF1501S-B?

For technical support, including UF1501S-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF1501S-B requirements.

6.How does Aetrix verify that UF1501S-B is sourced from the original manufacturer or authorized distributors?

All UF1501S-B 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 UF1501S-B meets industry standards.

7.What is the process for return or replacement of UF1501S-B?

All UF1501S-B units undergo pre-shipment inspection (PSI). If there is an issue with UF1501S-B, 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 UF1501S-B part is unused and in its original packaging.

Return procedure for UF1501S-B:

1.Submit a request within 90 days.

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

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