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

Diodes Incorporated 1N4933L-T

Name: 1N4933L-T
Brand: Diodes Incorporated
SKU: 1N4933L-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4933L-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

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

Datasheet:: 1N4933L-T.pdf

Description:: DIODE GEN PURP 50V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:7,402

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Product details

Overview

1N4933L-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.

For engineers reviewing the 1N4933L-T datasheet, 1N4933L-T pinout, 1N4933L-T application, or 1N4933L-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), especially for cost-sensitive 50–100V industrial and consumer SMPS designs.

Technical Context

This discrete silicon PN junction diode uses diffused junction technology to achieve fast switching with low stored charge, enabling efficient operation in 50–60Hz line-frequency and higher-frequency flyback auxiliary windings. Its 200ns t_RR and 5.0μA reverse leakage at 25°C support stable blocking during commutation.

The DO-41 axial package provides mechanical robustness and standard through-hole mounting compatibility. With R_θJA = 100°C/W and derated I_O = 1.0A at T_A = +75°C, it operates reliably across –65°C to +150°C ambient and junction temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for AC input voltage handling in bridge or half-wave rectifiers.
I_O	1.0 A @ T_A = +75°C - Continuous average forward current capability under defined PCB mounting conditions (9.5mm lead length).
V_FM	1.2 V @ I_F = 1.0A - Forward conduction loss directly impacts efficiency and thermal rise in rectifier stage.
t_RR	200 ns - Reverse recovery time determines switching losses and EMI generation during turn-off in inductive circuits.
I_FSM	30 A (8.3ms half-sine) - Surge withstand capability for cold-start inrush and transient overloads without failure.
R_θJA	100 °C/W - Junction-to-ambient thermal resistance defines required heatsinking or board copper area for thermal management.
I_RM	5.0 μA @ 25°C - Low reverse leakage ensures minimal standby power loss and stable DC bus hold-up.

Pinout & Package

DO-41 axial-leaded plastic package with cathode band marking; leads are bright tin-plated, solderable per MIL-STD-202 Method 208; polarity identified by single black band on cathode end.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry point	Connects to AC source or transformer secondary; must handle full load current and surge peaks.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connects to output capacitor or filter choke; sustains full V_RRM during off-state with minimal leakage.

Key Features

Feature	Design Value
Fast recovery (200ns)	Reduces switching losses and improves efficiency in line-frequency and auxiliary winding rectification.
30A non-repetitive surge rating	Withstands cold-start inrush and lightning-induced transients without degradation in typical AC input stages.
Low 1.2V forward drop at 1A	Limits conduction loss to ~1.2W at full load, easing thermal design in compact power supplies.
DO-41 RoHS-compliant package	Enables automated through-hole assembly and meets global environmental compliance requirements (EU RoHS 3).

Applications

AC/DC Adapter Input Rectification

Industrial Control Power Supply

Use Scenario: Converts 90–264V AC mains to pulsating DC in wall-wart adapters for consumer electronics.

IC Role / Device Role / Timing Role: Discrete rectifier diode performing half-wave or full-bridge rectification in primary-side input stage.

Use Value: 50V V_RRM and 30A I_FSM provide margin for 120VAC peak (170V) with surge tolerance, while 1.2V V_FM limits heat generation in space-constrained enclosures.

Use Scenario: Provides unregulated DC bus for 24V control logic and relay drivers in PLC I/O modules.

IC Role / Device Role / Timing Role: Fast recovery rectifier in transformer-coupled auxiliary supply, operating at 50/60Hz with minimal reverse recovery noise.

Use Value: 200ns t_RR suppresses high-frequency ringing that could interfere with adjacent analog sensing circuits in industrial environments.

LED Driver Auxiliary Winding

Appliance Motor Control Board

Use Scenario: Rectifies feedback winding voltage in flyback LED drivers to power the PWM controller IC.

IC Role / Device Role / Timing Role: Secondary-side rectifier delivering low-current, regulated bias power; requires fast recovery to avoid cross-conduction.

Use Value: Low 5.0μA reverse leakage at 25°C ensures stable startup and prevents controller brown-out during light-load conditions.

Use Scenario: Supplies logic-level DC for microcontroller and gate driver ICs on washing machine motor control boards.

IC Role / Device Role / Timing Role: General-purpose rectifier in isolated auxiliary supply derived from main transformer.

Use Value: DO-41 mechanical robustness and –65°C to +150°C operating range ensure reliability in thermally cycling appliance environments.

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 150ns t_RR and 1.3V V_FM at 1A.	Slightly faster recovery reduces EMI in noise-sensitive applications; higher V_FM increases conduction loss.	Prefer RS1A-T where lower t_RR is critical and thermal margin allows 0.1V higher drop.
1N4001-T	DO-41, 50V V_RRM, but 30μs t_RR and 1.1V V_FM; general-purpose, not fast recovery.	Unsuitable for high-frequency or low-noise auxiliary supplies due to excessive reverse recovery tail.	Select only for purely resistive, low-frequency (<1kHz) rectification where EMI and efficiency are non-critical.

Compared with RS1A-T and 1N4001-T, the 1N4933L-T delivers balanced performance: faster than 1N4001-T for reduced switching loss and EMI, yet more thermally efficient than RS1A-T in continuous conduction mode due to lower V_FM.

Availability

1N4933L-T is available at Aetrix Electronics and suitable for AC/DC adapter input rectification, industrial control power supplies, LED driver auxiliary windings, and appliance motor control boards requiring stable component supply and long-term manufacturing continuity.

Supply support for 1N4933L-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, specializing in high-reliability, cost-optimized components for power management, signal integrity, and protection.

The 1N4933–1N4937 series belongs to Diodes' fast recovery rectifier product line, designed specifically for efficient, low-cost AC/DC conversion in consumer, industrial, and appliance power supplies where V_RRM ≤ 600V and I_O ≤ 1.0A.

FAQ

What is the maximum junction temperature for 1N4933L-T?

The absolute maximum junction temperature (T_J) is +150°C, and the storage temperature range matches this at –65°C to +150°C. Operation above +150°C risks permanent parametric shift or catastrophic failure; thermal design must ensure T_J remains within limit using R_θJA = 100°C/W and measured ambient conditions.

Is 1N4933L-T suitable for use in a full-wave bridge configuration?

Yes - each 1N4933L-T diode can be used as one leg of a discrete full-wave bridge rectifier. Four units provide 50V output rating; ensure matching V_F and t_RR across all devices to balance current sharing and minimize thermal imbalance under load.

Does 1N4933L-T have lead-free and RoHS-compliant construction?

Yes - the device features bright tin-plated leads and molded plastic case compliant with EU RoHS Directive 2015/863/EU (RoHS 3), including all applicable exemptions. It is also halogen- and antimony-free per Diodes Incorporated's Green definition.

How does reverse recovery time affect EMI in power supply designs?

A shorter t_RR (200ns vs. 30μs in 1N4001) minimizes the reverse recovery current spike and associated dI/dt, reducing high-frequency ringing and conducted EMI on input lines. This eases compliance with EN55032 Class B limits without additional snubbing in many low-power applications.

1N4933L-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

1N4933L-T FAQ

1.How can I place an order for 1N4933L-T through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4933L-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 1N4933L-T reliable?

The price and inventory of 1N4933L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4933L-T is usually 5 days.

3.What payment methods are accepted for 1N4933L-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4933L-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4933L-T?

1N4933L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4933L-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 1N4933L-T?

For technical support, including 1N4933L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4933L-T requirements.

6.How does Aetrix verify that 1N4933L-T is sourced from the original manufacturer or authorized distributors?

All 1N4933L-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 1N4933L-T meets industry standards.

7.What is the process for return or replacement of 1N4933L-T?

All 1N4933L-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4933L-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 1N4933L-T part is unused and in its original packaging.

Return procedure for 1N4933L-T:

1.Submit a request within 90 days.

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

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