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Diodes Incorporated 1N4934L-T
- Part No.:
- 1N4934L-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4934L-T.pdf
- Description:
- DIODE GEN PURP 100V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,871
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Product details
Overview
1N4934L-T from Diodes Incorporated is a 1.0A fast recovery rectifier diode in DO-41 package, rated for 100V peak repetitive reverse voltage (VRRM), 1.2V forward voltage drop at 1.0A, and 200ns reverse recovery time - deployed in AC/DC input stage rectification for offline switch-mode power supplies.
For engineers reviewing the 1N4934L-T datasheet, 1N4934L-T pinout, 1N4934L-T application, or 1N4934L-T equivalent, key selection criteria include VRRM derating margin, tRR impact on switching loss, thermal resistance (RθJA = 100°C/W), and surge capability (IFSM = 30A) in high-reliability industrial power converters.
Technical Context
This discrete silicon PN-junction rectifier uses diffused junction technology to achieve fast recovery (tRR = 200ns) with low forward conduction loss (VFM = 1.2V @ 1.0A) and minimal reverse leakage (IRM = 5.0μA @ 25°C). It operates across –65°C to +150°C and supports single-phase, half-wave rectification under resistive or inductive loads at 60Hz.
The device is optimized for efficiency-critical 1A-level AC/DC front-ends where reduced switching loss and thermal management are prioritized over ultra-fast (sub-50ns) or ultra-high-voltage (>600V) operation. Its DO-41 package enables through-hole mounting with 9.5mm lead length for standardized PCB layout and thermal derating per Fig. 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 100 V - Maximum allowable repetitive reverse voltage before breakdown; sets minimum insulation margin for 85–265VAC input designs. |
| IO @ TA=75°C | 1.0 A - Continuous average forward current rating at 75°C ambient; defines usable DC output current in thermally constrained layouts. |
| VFM @ IF=1.0A | 1.2 V - Forward voltage drop determining conduction loss (1.2W @ 1A) and thermal rise in linear rectifier stages. |
| tRR | 200 ns - Reverse recovery time governing switching loss and EMI generation during turn-off in 20–100kHz SMPS topologies. |
| IFSM (8.3ms) | 30 A - Non-repetitive surge current handling capacity; ensures robustness against line transients and cold-start inrush. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; used with Pdiss to calculate worst-case junction temperature rise on standard FR-4 PCB. |
| IRM @ 25°C | 5.0 μA - Reverse leakage at rated blocking voltage; impacts standby power loss and high-impedance bias network stability. |
Pinout & Package
DO-41 molded plastic package with axial leads; cathode identified by band marking; RoHS-compliant bright tin plating; UL 94V-0 flammability rating; 0.35g typical mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC source or transformer secondary; must withstand full surge current and thermal stress during conduction. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to output capacitor positive rail; reverse voltage appears here during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery time | 200 ns - Reduces switching loss and diode-induced ringing in 20–100 kHz flyback and forward converters. |
| Low forward voltage | 1.2 V @ 1.0A - Limits conduction loss to ≤1.2W, easing thermal design in compact enclosed power supplies. |
| 30A surge rating | 8.3ms half-sine - Withstands IEC 61000-4-5 line surges and transformer inrush without degradation. |
| DO-41 mechanical standardization | Industry-wide footprint compatibility - Enables direct replacement in legacy designs and simplifies procurement logistics. |
| RoHS-compliant finish | Bright tin plating per MIL-STD-202 - Ensures reliable solder wetting and long-term intermetallic stability in automated assembly. |
Applications
| AC/DC Adapter Input Rectification | Industrial Control Power Supply |
|---|---|
Use Scenario: 85–265VAC input rectification in 5–12W wall adapters powering IoT sensors and USB peripherals. IC Role / Device Role / Timing Role: Primary-side unidirectional current steering element converting AC to pulsating DC prior to bulk capacitance. Use Value: 1.2V VFM minimizes no-load power loss; 200ns tRR suppresses high-frequency noise coupling into downstream regulation circuitry. | Use Scenario: Front-end rectification in DIN-rail mounted 24VDC power modules for PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: High-reliability mains interface diode handling continuous 1A load and occasional 30A surge events. Use Value: 30A IFSM and –65°C to +150°C operating range ensure uptime in factory environments with wide ambient swings and electrical disturbances. |
| LED Driver Auxiliary Supply | UPS Battery Charging Circuit |
Use Scenario: Bias supply rectification for constant-current LED driver ICs in commercial lighting fixtures. IC Role / Device Role / Timing Role: Low-leakage (5.0μA) rectifier feeding startup and feedback circuitry from auxiliary winding. Use Value: Low IRM prevents standby current drain and maintains stable reference voltages during dimming or sleep modes. | Use Scenario: Half-wave rectification in battery charging path of line-interactive UPS systems during utility failure mode. IC Role / Device Role / Timing Role: Isolates charger input from inverter output while enabling bidirectional energy flow control. Use Value: DO-41 axial form factor allows manual replacement in field-serviceable units; 100V VRRM accommodates 90VAC brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RS1M-T | VRRM = 1000V, tRR = 500ns, VFM = 1.3V @ 1.0A, same DO-41 package | Higher voltage margin but slower recovery; suited for higher-line or transient-prone grids | Select when system requires >600V isolation or has elevated line surge exposure. |
| 1N4004-T | VRRM = 400V, tRR ≈ 2μs (standard recovery), VFM = 1.1V @ 1.0A, same DO-41 | Lower cost, higher conduction efficiency, but unsuitable for >20kHz switching due to slow recovery | Prefer only in low-frequency (<1kHz), non-switching rectifiers where EMI and loss are not critical. |
Compared with RS1M-T and 1N4004-T, the 1N4934L-T delivers optimal balance of speed (200ns), voltage (100V), and conduction loss (1.2V) for 20–100kHz SMPS input stages - making it more efficient than 1N4004-T and more responsive than RS1M-T in mid-frequency power conversion.
Availability
1N4934L-T is available at Aetrix Electronics and suitable for AC/DC adapter input rectification, industrial control power supplies, LED driver auxiliary supplies, and UPS battery charging circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N4934L-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, manufacturing, and sales operations across Asia, Europe, and North America.
The 1N4933–1N4937 series belongs to Diodes' general-purpose fast recovery rectifier product line, engineered specifically for cost-sensitive, high-volume AC/DC power conversion where reliability, thermal performance, and consistent surge immunity are essential.
FAQ
What is the maximum junction temperature for 1N4934L-T?
The absolute maximum junction temperature (TJ) is +150°C, with storage temperature matching this range. Operation above this limit risks permanent parametric shift or catastrophic failure. Derating curves in the datasheet require limiting IO to ≤0.5A at +125°C ambient when using standard PCB mounting with 9.5mm lead length.
Is 1N4934L-T compatible with lead-free reflow soldering?
No - the 1N4934L-T is specified for wave or hand soldering only, with a maximum peak temperature of 260°C for 10 seconds. Its DO-41 package and axial leads are not qualified for lead-free reflow profiles (typically >260°C for >30 seconds), and thermal shock may crack the molded plastic body.
How does reverse recovery time affect EMI in a flyback converter?
A 200ns tRR reduces high-frequency ringing during diode turn-off, lowering conducted EMI in the 30–100MHz band. Slower diodes (e.g., 1N4004) generate larger di/dt-induced voltage spikes across parasitic inductances, increasing filter component stress and radiated emissions near switching nodes.
Can 1N4934L-T replace 1N4933L-T in a design?
Yes - both share identical package, thermal specs, and forward characteristics, differing only in VRRM (50V vs. 100V). Substituting 1N4934L-T for 1N4933L-T adds 50V margin against line surges and brownouts, with no change to layout, thermal design, or bill-of-materials footprint.
1N4934L-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):
- 100 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 @ 100 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
1N4934L-T FAQ
1.How can I place an order for 1N4934L-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4934L-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 1N4934L-T reliable?
The price and inventory of 1N4934L-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4934L-T is usually 5 days.
3.What payment methods are accepted for 1N4934L-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4934L-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4934L-T?
1N4934L-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4934L-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 1N4934L-T?
For technical support, including 1N4934L-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4934L-T requirements.
6.How does Aetrix verify that 1N4934L-T is sourced from the original manufacturer or authorized distributors?
All 1N4934L-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 1N4934L-T meets industry standards.
7.What is the process for return or replacement of 1N4934L-T?
All 1N4934L-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4934L-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 1N4934L-T part is unused and in its original packaging.
Return procedure for 1N4934L-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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