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Diodes Incorporated 1N4761A-T
- Part No.:
- 1N4761A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4761A-T.pdf
- Description:
- DIODE ZENER 75V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:9,647
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Product details
Overview
1N4761A-T from Diodes Incorporated is a 1.0W, 75V nominal Zener diode in DO-41 glass package with ±5% voltage tolerance, 175Ω maximum Zener impedance at 3.3mA test current, and 5.0µA maximum reverse leakage at 56.0V, used for precision voltage regulation in power supply reference circuits.
For engineers reviewing the 1N4761A-T datasheet, 1N4761A-T pinout, 1N4761A-T application, or 1N4761A-T equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (175°C/W), surge current rating (60A @ 8.3ms), and DO-41 mechanical compatibility in space-constrained linear regulator designs.
Technical Context
This 75V Zener diode operates with a sharp breakdown knee verified by dual-point impedance measurement per JEDEC standards, ensuring stable regulation under varying load conditions. Its temperature coefficient of +0.06 to +0.095%/°C indicates positive drift above 25°C, requiring thermal derating above 50°C at 6.67mW/°C.
The device uses Sn96.5Ag3.5 lead finish compliant with MIL-STD-202 Method 208, housed in UL 94V-0 rated glass encapsulation. Cathode band polarity marking and 0.35g mass support manual and automated assembly in legacy power management PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 75 V - precise DC reference voltage at 3.3 mA test current |
| Power Dissipation | 1.0 W - maximum steady-state power handling at 25°C ambient |
| Zener Impedance | 175 Ω max at IZT = 3.3 mA - low dynamic resistance for tight regulation |
| Reverse Leakage | 5.0 µA max at VR = 56.0 V - ensures minimal standby current in high-impedance bias networks |
| Surge Current | 60 A @ 8.3 ms - withstands transient overvoltage events per standard waveform |
| Thermal Resistance | 175 °C/W - junction-to-ambient value assuming 9.5 mm lead length at 50°C |
| Temperature Coefficient | +0.06 to +0.095 %/°C - predictable positive voltage drift with rising temperature |
Pinout & Package
DO-41 glass axial package with cathode band marking; two-terminal unidirectional device. No active pin numbering-cathode identified by painted band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to regulated output node; sinks current during reverse conduction |
| Anode (unmarked end) | Reference return path | Typically tied to ground or common rail; completes bias current loop |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W Power Rating | Enables use in medium-power shunt regulators without external heat sinking |
| ±5% VZ Tolerance | Supports cost-sensitive applications where 3.75V absolute tolerance is acceptable |
| UL 94V-0 Glass Encapsulation | Provides flame-retardant reliability in safety-critical industrial power supplies |
| Sn96.5Ag3.5 Lead Finish | Ensures robust solderability and intermetallic bond integrity in reflow and wave processes |
Applications
| Linear Voltage Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 75V reference in discrete op-amp-based feedback networks for lab-grade bench power supplies. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage for error amplifier input. Use Value: 175Ω impedance and +0.06%/°C TC enable <±0.5% total reference drift across 0–70°C operating range. |
Use Scenario: Transient suppression on 48V telecom distribution bus exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Shunt clamp activated during >75V transients to protect downstream DC-DC converters. Use Value: 60A 8.3ms surge rating absorbs IEC 61000-4-5 Level 4 energy without degradation. |
| Current Source Biasing | Signal-Level Clipping |
Use Scenario: Constant-current source for LED driver biasing in analog lighting control modules. IC Role / Device Role / Timing Role: Zener sets base-emitter voltage of series pass transistor to define current setpoint. Use Value: Low 5.0µA leakage at 56V ensures sub-1% current error in 10mA bias circuits. |
Use Scenario: Audio signal limiting stage in vintage-style guitar effects pedals operating from ±15V rails. IC Role / Device Role / Timing Role: Bidirectional clipping via back-to-back configuration with complementary diode. Use Value: Sharp 75V breakdown knee delivers clean hard-clipping onset with minimal harmonic distortion. |
Availability
1N4761A-T is available at Aetrix Electronics and suitable for linear voltage reference, overvoltage clamp, current source biasing, and signal-level clipping applications requiring stable component supply and legacy DO-41 footprint compatibility.
Supply support for 1N4761A-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 power management and signal integrity solutions.
The 1N47xxA series belongs to Diodes' legacy Zener diode product line, designed specifically for cost-effective, through-hole voltage regulation in industrial power supplies and analog instrumentation.
FAQ
What is the maximum continuous Zener current for 1N4761A-T at 25°C?
The maximum continuous Zener current is calculated as Pd/VZ = 1000 mW / 75 V ≈ 13.3 mA. However, the datasheet specifies a test current (IZT) of 3.3 mA for regulation characterization, and operation above this requires thermal derating per Figure 1 to avoid exceeding 175°C junction temperature.
Is 1N4761A-T RoHS compliant?
Yes, 1N4761A-T features a lead-free Sn96.5Ag3.5 terminal finish and complies with EU Directive 2002/95/EC (RoHS), with exemptions applied for glass encapsulation and high-temperature soldering as permitted under Annex Notes 5 and 7.
Can 1N4761A-T be used in surface-mount designs?
No - 1N4761A-T is packaged exclusively in the axial DO-41 through-hole format. It lacks SMD-compatible terminals or tape-and-reel orientation for pick-and-place; alternative SMT Zeners (e.g., BZX84-C75) would be required for board-space-constrained layouts.
Why does the datasheet list "OBSOLETE – PART DISCONTINUED"?
Diodes Incorporated has discontinued the 1N4761A-T for new designs, though Aetrix Electronics maintains limited legacy inventory for repair, maintenance, and long-lifecycle industrial programs. No functional replacement is offered by the manufacturer.
1N4761A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 175 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 56 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4761A-T FAQ
1.How can I place an order for 1N4761A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4761A-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 1N4761A-T reliable?
The price and inventory of 1N4761A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4761A-T is usually 5 days.
3.What payment methods are accepted for 1N4761A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4761A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4761A-T?
1N4761A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4761A-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 1N4761A-T?
For technical support, including 1N4761A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4761A-T requirements.
6.How does Aetrix verify that 1N4761A-T is sourced from the original manufacturer or authorized distributors?
All 1N4761A-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 1N4761A-T meets industry standards.
7.What is the process for return or replacement of 1N4761A-T?
All 1N4761A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4761A-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 1N4761A-T part is unused and in its original packaging.
Return procedure for 1N4761A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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