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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Diodes Incorporated 1N4758A-T

Name: 1N4758A-T
Brand: Diodes Incorporated
SKU: 1N4758A-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4758A-T

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

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

Datasheet:: 1N4758A-T.pdf

Description:: DIODE ZENER 56V 1W DO41

Quantity:: RFQ Add To RFQ list

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Inventory:6,080

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Product details

Overview

1N4758A-T from Diodes Incorporated is a 1.0 W, 56 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and overvoltage protection in DC power supplies and reference circuits. It delivers 4.5 mA test current, 110 Ω dynamic impedance at I_ZT, and operates across –65°C to +175°C.

For engineers reviewing the 1N4758A-T datasheet, 1N4758A-T pinout, 1N4758A-T application, or 1N4758A-T equivalent, key selection factors include its 56 V nominal Zener voltage, 1.0 W power rating with 6.67 mW/°C derating above 50°C, thermal resistance of 175 °C/W, and RoHS-compliant Sn96.5Ag3.5 terminations.

Technical Context

This discrete Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current when applied voltage exceeds its 56 V breakdown threshold. Its sharp knee and low dynamic impedance (110 Ω at 4.5 mA) ensure tight regulation under varying load conditions.

The device uses a glass-passivated junction in a DO-41 axial package, enabling reliable operation up to 175°C junction temperature. Its 0.25 mA maximum reverse leakage at 42.6 V and 5 µA at rated VR confirm low standby loss and high stability in precision biasing applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	56 V ±5% - defines regulated output voltage with tolerance suitable for mid-range supply rail clamping
Power Dissipation	1.0 W @ 25°C - supports continuous regulation in compact linear power stages without forced cooling
Zener Test Current	4.5 mA - operating point where voltage and impedance are specified; sets minimum bias requirement
Zener Impedance	110 Ω @ I_ZT - quantifies AC voltage variation per mA change; critical for ripple rejection in references
Reverse Leakage	5 µA @ 42.6 V - ensures minimal quiescent current draw below breakdown, preserving efficiency
Thermal Resistance	175 °C/W - determines junction temperature rise per watt; requires lead length ≤9.5 mm for full rating
Operating Temperature	–65°C to +175°C - enables use in automotive engine compartments and industrial control enclosures

Pinout & Package

Package: DO-41 glass axial package with cathode band marking; 0.35 g mass; UL 94V-0 flammability rating; Sn96.5Ag3.5 solderable terminations.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection	Connected to lower potential node; carries forward current up to 200 mA (VF = 1.2 V)
Cathode	Zener breakdown terminal / regulation reference node	Marked with band; referenced to system ground or return path; sinks reverse current during regulation

Key Features

Feature	Design Value
1.0 W Power Rating	Enables robust voltage clamping in 5–12 V supply rails without external heat sinking
±5% Zener Tolerance	Provides predictable regulation accuracy for non-critical analog references and protection thresholds
DO-41 Glass Construction	Delivers hermetic reliability and stable long-term Zener voltage drift vs. plastic-packaged alternatives
RoHS-Compliant Termination	Sn96.5Ag3.5 finish ensures compatibility with lead-free reflow and wave soldering processes
Wide Operating Temperature	Supports deployment in under-hood automotive, outdoor telecom, and industrial motor drive environments

Applications

DC Power Supply Regulation

Overvoltage Protection Circuit

Use Scenario: Stabilizing unregulated 60 V DC input to fixed 56 V reference for op-amp biasing or ADC reference buffers.

IC Role / Device Role / Timing Role: Shunt regulator providing precise, low-drift voltage reference independent of load current variation.

Use Value: Maintains <±0.5 V output deviation across 1–10 mA load range due to 110 Ω Z_ZT and sharp breakdown knee.

Use Scenario: Clamping transient spikes on 48 V telecom power bus to prevent damage to downstream DC-DC converters.

IC Role / Device Role / Timing Role: Fast-acting crowbar element that conducts surge current above 56 V threshold.

Use Value: Absorbs 80 mA 8.3 ms surge (I_ZS) without degradation, leveraging 1.0 W rating and glass-junction ruggedness.

Industrial Sensor Biasing

Automotive ECU Reference

Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in factory-floor PLC modules.

IC Role / Device Role / Timing Role: Low-noise, temperature-stable voltage source for sensor bridge excitation.

Use Value: Temperature coefficient of +0.06 to +0.095 %/°C minimizes drift-induced measurement error over –40°C to +85°C ambient.

Use Scenario: Generating internal 56 V auxiliary rail for ignition coil driver ICs in engine control units.

IC Role / Device Role / Timing Role: High-reliability voltage clamp protecting gate drivers from load dump transients.

Use Value: Withstands –65°C to +175°C junction range and meets automotive-grade thermal cycling requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DFLZ56-7-F	Surface-mount SOD-123FL package; 56 V ±5%; 1.0 W; 100 Ω Z_ZT; 1 µA I_R @ 45.4 V	Designed for automated PCB assembly; lower profile; higher IR rejection	Select for space-constrained, high-volume production where reflow compatibility is required
1N5255B	DO-35 package; 56 V ±5%; 0.5 W; 150 Ω Z_ZT; 5 µA I_R @ 42.6 V	Lower power rating; smaller glass body; higher thermal resistance (300 °C/W)	Select only for low-power signal-level references where 0.5 W suffices and board space is extremely limited

Compared with DFLZ56-7-F, the 1N4758A-T offers proven through-hole reliability and higher surge current handling (80 mA vs. 50 mA), while 1N5255B trades power capability for footprint reduction-making the 1N4758A-T optimal for legacy designs needing robust 1 W regulation in accessible axial format.

Availability

1N4758A-T is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and industrial sensor biasing requiring stable component supply and long-lifecycle support.

Supply support for 1N4758A-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 components for power management, signal integrity, and protection.

The 1N47xxA series belongs to Diodes' standard Zener diode product line, engineered for cost-effective, thermally robust voltage regulation in industrial, automotive, and communications infrastructure applications.

FAQ

What is the maximum surge current rating for 1N4758A-T?

The 1N4758A-T is rated for 80 mA maximum surge current under an 8.3 ms single half-sine wave condition. This value is specified in the Electrical Characteristics table and reflects its ability to absorb transient energy without parametric shift or failure, provided leads are maintained at ≤50°C via proper mounting and thermal relief.

Is 1N4758A-T RoHS compliant?

Yes, the 1N4758A-T features a lead-free Sn96.5Ag3.5 termination and complies with EU Directive 2002/95/EC (RoHS), including applicable exemptions for glass and high-temperature solder. Full compliance documentation is available in Diodes Incorporated's AP02008 packaging specification and DS18007 datasheet revision notes.

How does thermal derating work for this Zener diode?

The 1N4758A-T derates linearly at 6.67 mW/°C above 50°C ambient, based on a 9.5 mm lead length from case. At 75°C ambient, maximum power drops to 0.83 W; at 125°C, it falls to 0.5 W. Derating assumes leads act as heat sinks-shorter leads increase thermal resistance and reduce allowable dissipation.

Can 1N4758A-T replace 1N4758A-A in a design?

Yes-1N4758A-T and 1N4758A-A share identical electrical and thermal specifications; only packaging differs: tape-and-reel (T) vs. ammo pack (A). Both use DO-41 glass construction and Sn96.5Ag3.5 terminations. No circuit redesign or qualification is needed when switching between these variants.

1N4758A-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):: 56 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 110 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 42.6 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

1N4758A-T FAQ

1.How can I place an order for 1N4758A-T through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4758A-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 1N4758A-T reliable?

The price and inventory of 1N4758A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4758A-T is usually 5 days.

3.What payment methods are accepted for 1N4758A-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4758A-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4758A-T?

1N4758A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4758A-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 1N4758A-T?

For technical support, including 1N4758A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4758A-T requirements.

6.How does Aetrix verify that 1N4758A-T is sourced from the original manufacturer or authorized distributors?

All 1N4758A-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 1N4758A-T meets industry standards.

7.What is the process for return or replacement of 1N4758A-T?

All 1N4758A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4758A-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 1N4758A-T part is unused and in its original packaging.

Return procedure for 1N4758A-T:

1.Submit a request within 90 days.

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

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