Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated 1N4933-T

Name: 1N4933-T
Brand: Diodes Incorporated
SKU: 1N4933-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 1N4933-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

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

Datasheet:: 1N4933-T.pdf

Description:: DIODE GEN PURP 50V 1A DO41

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:14,481

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

1N4933-T from Diodes Incorporated is a 1.0A fast recovery rectifier diode in DO-41 package, rated for 50V peak repetitive reverse voltage (V_RRM), 1.2V forward voltage drop at 1.0A (V_FM), and 200ns reverse recovery time (t_RR), used in AC/DC input stage rectification of offline power supplies and DC-DC converter front-ends.

For engineers reviewing the 1N4933-T datasheet, 1N4933-T pinout, 1N4933-T application, or 1N4933-T equivalent, key selection criteria include V_RRM, I_O, t_RR, thermal resistance (R_θJA = 100°C/W), and surge rating (I_FSM = 30A) under 8.3ms half-sine conditions.

Technical Context

This device employs a diffused junction structure to achieve fast switching with low forward conduction loss and controlled minority-carrier lifetime. Its 200ns reverse recovery time enables operation in high-frequency rectification up to ~50kHz without excessive switching loss.

The DO-41 molded plastic package provides mechanical robustness and UL 94V-0 flammability rating, while the cathode band polarity marking and bright tin-plated leads ensure reliable PCB assembly and solderability per MIL-STD-202 Method 208.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse voltage before breakdown; defines safe operating limit in AC line rectification.
I_O	1.0 A @ T_A = +75°C - Continuous average forward current capability with 9.5mm lead length; derates linearly above ambient.
V_FM	1.2 V @ I_F = 1.0A - Forward voltage drop determining conduction loss and thermal dissipation in rectifier stage.
t_RR	200 ns - Reverse recovery time measured at I_F = 0.5A, I_R = 1A, I_rr = 0.25A; critical for EMI and efficiency in SMPS.
I_FSM	30 A (8.3ms half-sine) - Non-repetitive surge current rating; supports inrush current handling in power-up sequences.
R_θJA	100 °C/W - Junction-to-ambient thermal resistance; determines temperature rise under given power dissipation on standard PCB mount.
I_RM	5.0 µA @ 25°C - Peak reverse leakage current at rated DC blocking voltage; impacts standby power in low-power systems.

Pinout & Package

DO-41 axial-leaded plastic package with cathode band marking; body diameter 4.06–5.21 mm, length 25.4 mm, lead diameter 0.71–0.864 mm, lead spacing 2.00–2.72 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC source or transformer secondary; must withstand surge and thermal stress during conduction.
Cathode (marked by band)	Forward current exit / reverse blocking terminal	Connected to output capacitor or downstream circuit; reverse-biased during off-state; defines polarity of rectified output.

Key Features

Feature	Design Value
Fast recovery time	200 ns enables efficient operation in 20–50 kHz switch-mode power supplies without excessive switching loss or EMI.
Low forward voltage	1.2 V at 1.0A reduces conduction loss and junction temperature rise compared to standard rectifiers (e.g., 1N400x series).
30A surge rating	Withstands inrush currents from bulk capacitors in offline AC/DC converters without degradation or failure.
RoHS-compliant finish	Bright tin-plated leads meet EU RoHS 2015/863/EU and support lead-free reflow and wave soldering processes.

Applications

AC/DC Adapter Input Rectification

DC-DC Converter Front-End

Use Scenario: Converts 90–264V AC mains to pulsating DC prior to bulk capacitance and PWM controller in wall adapters.

IC Role / Device Role / Timing Role: Unidirectional current valve enabling half-wave or full-wave bridge rectification; no timing function.

Use Value: 200ns t_RR minimizes reverse recovery loss and associated EMI, improving efficiency over 1N4007 in higher-frequency designs.

Use Scenario: Rectifies high-frequency transformer secondary output in isolated flyback or forward converters.

IC Role / Device Role / Timing Role: Output rectifier conducting only during transformer reset phase; reverse recovery behavior directly affects duty cycle fidelity.

Use Value: Low V_FM (1.2V) reduces conduction loss at 1A load, lowering thermal stress on PCB layout and improving power density.

Industrial Power Supply Input Stage

LED Driver Bulk Rectification

Use Scenario: Handles continuous 1A rectified current in 24V/48V industrial PSUs with wide ambient temperature range (-40°C to +85°C).

IC Role / Device Role / Timing Role: Primary rectifier in unregulated or regulated offline supply; operates in repetitive half-sine conduction mode.

Use Value: R_θJA = 100°C/W and -65°C to +150°C operating range ensure reliability in thermally constrained enclosures.

Use Scenario: Rectifies AC input in non-isolated LED drivers powering streetlights or commercial fixtures.

IC Role / Device Role / Timing Role: Input-stage diode in bridge configuration; subjected to line-frequency ripple and occasional surges.

Use Value: 30A I_FSM rating protects against lamp cold-start surges and lightning-induced transients on AC lines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
RS1A-T	Same DO-41 package; 50V V_RRM, but faster t_RR = 150ns and lower V_FM = 1.1V at 1.0A.	Suitable for higher-frequency (>100kHz) or lower-loss designs where tighter recovery control is required.	Select RS1A-T when optimizing for minimal switching loss in compact, high-efficiency SMPS.
1N4934-T	Identical construction and packaging, but rated for 100V V_RRM; otherwise identical electrical specs (I_O, t_RR, V_FM, I_FSM).	Used where higher reverse voltage margin is needed-e.g., in 115VAC-only systems with reduced derating.	Choose 1N4934-T if system peak reverse voltage exceeds 50V due to transient or topology requirements.

Compared with RS1A-T, 1N4933-T offers slightly higher V_FM and slower t_RR but broader legacy design acceptance; versus 1N4934-T, it trades reverse voltage headroom for cost-sensitive 50V-rated applications without compromising surge or thermal performance.

Availability

1N4933-T is available at Aetrix Electronics and suitable for AC/DC adapter input rectification, industrial power supply input stages, and LED driver bulk rectification requiring stable component supply and long-term manufacturability.

Supply support for 1N4933-T 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 and manufacturing operations across Asia and the Americas.

The 1N4933-T belongs to the 1N4933–1N4937 fast recovery rectifier family, engineered for cost-effective, high-reliability AC/DC conversion in consumer, industrial, and lighting power supplies.

FAQ

What is the maximum junction temperature for 1N4933-T?

The 1N4933-T has an operating junction temperature range of –65°C to +150°C. Its thermal resistance is R_θJA = 100°C/W under standard PCB mounting with 9.5mm lead length, meaning a 1.2W power dissipation (1.0A × 1.2V) yields a 120°C rise above ambient-requiring ambient ≤30°C for safe operation at full current.

Is 1N4933-T suitable for use in a full-wave bridge configuration?

Yes, 1N4933-T is commonly used in discrete full-wave bridge rectifiers. Four units can be assembled into a bridge with proper cathode/anode orientation; its 30A surge rating and 50V V_RRM support typical 120VAC or 230VAC inputs with appropriate derating for peak line voltage and transients.

How does 1N4933-T differ from standard 1N400x series diodes?

Unlike the 1N400x series (which are general-purpose rectifiers with ~2µs t_RR), the 1N4933-T features fast recovery (200ns), lower V_FM (1.2V vs. ~1.1V at low current but better at 1A), and higher surge rating (30A vs. 30A for 1N4007). It is optimized for higher-frequency switching applications where reverse recovery loss matters.

Does 1N4933-T require heatsinking in typical applications?

No external heatsink is required for 1N4933-T at I_O = 1.0A and ambient ≤50°C, provided the PCB has adequate copper area (≥1 cm² per lead) and leads are trimmed to 9.5mm. At full load and higher ambient, thermal derating per Figure 1 applies-e.g., 0.7A max at +100°C ambient.

1N4933-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 1 A

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

Reverse Recovery Time (trr):: 200 ns

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

Capacitance @ Vr, F:: 15pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

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

1N4933-T FAQ

1.How can I place an order for 1N4933-T through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4933-T 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 1N4933-T reliable?

The price and inventory of 1N4933-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4933-T is usually 5 days.

3.What payment methods are accepted for 1N4933-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4933-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4933-T?

1N4933-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4933-T 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 1N4933-T?

For technical support, including 1N4933-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4933-T requirements.

6.How does Aetrix verify that 1N4933-T is sourced from the original manufacturer or authorized distributors?

All 1N4933-T 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 1N4933-T meets industry standards.

7.What is the process for return or replacement of 1N4933-T?

All 1N4933-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4933-T, 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 1N4933-T part is unused and in its original packaging.

Return procedure for 1N4933-T:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…