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 > Zener > Single Zener Diodes

Microchip Technology 1N4754AUR/TR

Name: 1N4754AUR/TR
Brand: Microchip Technology
SKU: 1N4754AUR/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 1N4754AUR/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AB, MELF (Glass)

Datasheet:: 1N4754AUR/TR.pdf

Description:: DIODE ZENER 39V 1W DO213AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,485

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

Product details

Overview

1N4754AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with a nominal Zener voltage of 39 V, ±5% tolerance, 6.5 mA test current, and 23 Ω dynamic impedance at I_ZT. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-reliability power supply feedback loops and reference circuits.

For engineers reviewing the 1N4754AUR/TR datasheet, 1N4754AUR/TR pinout, 1N4754AUR/TR application, or 1N4754AUR/TR equivalent, key selection criteria include Zener voltage stability over temperature, low dynamic impedance for tight regulation, hermetic DO-213AB MELF package suitability for high-density layouts, and RoHS-compliant (e3) termination options.

Technical Context

This device implements a silicon planar Zener junction optimized for stable reverse-breakdown operation under regulated DC bias. Its 39 V nominal Zener voltage is specified at 6.5 mA test current (I_ZT) with 23 Ω dynamic impedance (Z_ZT) and maximum 5 μA reverse leakage at 29.7 V (V_R).

The DO-213AB glass MELF package provides hermetic sealing, inherent radiation hardness per MicroNote 050, and thermal resistance of 130 °C/W junction-to-ambient on FR4 with recommended footprint-enabling reliable operation in aerospace, industrial, and medical systems requiring extended temperature range and long-term parametric stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	39 V ±5% at 6.5 mA - defines precise regulation point for feedback networks
Power Dissipation	1.0 W at T_EC < 125 °C - supports continuous operation in compact thermal environments
Dynamic Impedance (Z_ZT)	23 Ω at I_ZT = 6.5 mA - ensures minimal output voltage variation under load transients
Reverse Leakage Current	5 μA max at V_R = 29.7 V - guarantees low quiescent error in high-impedance reference paths
Operating Temperature	–65 °C to +175 °C - enables deployment in extreme-environment avionics and downhole electronics
Package	DO-213AB glass MELF - hermetically sealed, leadless, ESD-insensitive, and radiation-hardened

Pinout & Package

DO-213AB glass MELF package: cylindrical, leadless, cathode band marked on one end; terminals are axial, non-polarized except for cathode identification by band.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Zener anode connection in reverse-bias configuration	Must be held at higher potential than anode to enable Zener conduction; polarity critical for regulation
Anode (unbanded end)	Zener cathode connection in reverse-bias configuration	Reference node tied to ground or lower-potential rail; forms stable voltage drop across cathode-anode

Key Features

Feature	Design Value
Hermetic glass MELF construction	Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments
Inherent radiation hardness	Validated per MicroNote 050 - suitable for space-grade and nuclear instrumentation without additional shielding
±5% Zener voltage tolerance (A suffix)	Reduces need for post-assembly trimming in mid-precision voltage references
Low 23 Ω dynamic impedance	Maintains regulation accuracy within ±0.1 V under ±10 mA load step changes at 39 V
RoHS-compliant (e3) termination	Matte-tin plating meets JEDEC J-STD-020 reflow requirements and eliminates lead-based solder compatibility issues

Applications

Switch-Mode Power Supply Feedback	Industrial Sensor Reference
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener diode provides stable 39 V reference for TL431 shunt regulator biasing and error amplifier threshold setting. Use Value: Tight 39 V ±5% tolerance and low Z_ZT minimize output voltage drift across line/load/temperature, improving overall PSU accuracy to ±1.5%.	Use Scenario: Providing excitation voltage for 4–20 mA current-loop pressure transmitters operating in oilfield control cabinets. IC Role / Device Role / Timing Role: Serves as primary voltage clamp and precision reference for analog front-end op-amp biasing and DAC output scaling. Use Value: Hermetic DO-213AB package withstands 175 °C ambient cabinet temperatures while maintaining regulation stability-critical for uncooled industrial enclosures.
Aerospace Avionics Biasing	Medical Imaging Power Sequencing
Use Scenario: Generating stable bias rails for RF amplifiers and ADC drivers in satellite telemetry receivers. IC Role / Device Role / Timing Role: Functions as radiation-hardened Zener clamp protecting LDO inputs from transient overvoltage during launch vibration-induced coupling. Use Value: Inherent radiation hardness (MicroNote 050) and –65 °C to +175 °C operation eliminate need for derating or shielding in LEO mission profiles.	Use Scenario: Controlling power-up sequencing of X-ray detector ASICs requiring strict voltage ramp timing and overvoltage protection. IC Role / Device Role / Timing Role: Acts as crowbar-trigger reference and soft-start clamp in FPGA-controlled power management ICs. Use Value: Low 5 μA leakage at 29.7 V ensures no false triggering during slow-ramp startup; glass MELF reliability prevents field failures in Class III medical devices.

Switch-Mode Power Supply Feedback

Industrial Sensor Reference

Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback.

IC Role / Device Role / Timing Role: Zener diode provides stable 39 V reference for TL431 shunt regulator biasing and error amplifier threshold setting.

Use Value: Tight 39 V ±5% tolerance and low Z_ZT minimize output voltage drift across line/load/temperature, improving overall PSU accuracy to ±1.5%.

Use Scenario: Providing excitation voltage for 4–20 mA current-loop pressure transmitters operating in oilfield control cabinets.

IC Role / Device Role / Timing Role: Serves as primary voltage clamp and precision reference for analog front-end op-amp biasing and DAC output scaling.

Use Value: Hermetic DO-213AB package withstands 175 °C ambient cabinet temperatures while maintaining regulation stability-critical for uncooled industrial enclosures.

Aerospace Avionics Biasing

Medical Imaging Power Sequencing

Use Scenario: Generating stable bias rails for RF amplifiers and ADC drivers in satellite telemetry receivers.

IC Role / Device Role / Timing Role: Functions as radiation-hardened Zener clamp protecting LDO inputs from transient overvoltage during launch vibration-induced coupling.

Use Value: Inherent radiation hardness (MicroNote 050) and –65 °C to +175 °C operation eliminate need for derating or shielding in LEO mission profiles.

Use Scenario: Controlling power-up sequencing of X-ray detector ASICs requiring strict voltage ramp timing and overvoltage protection.

IC Role / Device Role / Timing Role: Acts as crowbar-trigger reference and soft-start clamp in FPGA-controlled power management ICs.

Use Value: Low 5 μA leakage at 29.7 V ensures no false triggering during slow-ramp startup; glass MELF reliability prevents field failures in Class III medical devices.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4754A	Same 39 V ±5%, but DO-41 axial-leaded package; higher thermal resistance (150 °C/W vs. 130 °C/W)	Requires through-hole mounting; unsuitable for high-density SMT assemblies	Select 1N4754AUR/TR when board space, automated assembly, or thermal performance on FR4 are priorities
SMAJ4754A	Same electrical specs, but SMA package; 1.5× larger footprint, higher capacitance (15 pF vs. <5 pF), lower surge rating (400 W vs. 1000 W)	Better suited for transient suppression than precision regulation due to higher Z_ZK and capacitance	Choose 1N4754AUR/TR for low-noise, low-capacitance voltage references where signal integrity matters

Compared with 1N4754A and SMAJ4754A, the 1N4754AUR/TR delivers superior thermal performance in SMT layouts, lower parasitic capacitance for high-frequency stability, and hermetic reliability for mission-critical regulation-making it optimal for aerospace, medical, and industrial reference designs demanding zero field failure.

Availability

1N4754AUR/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, aerospace avionics biasing, and medical imaging power sequencing requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for 1N4754AUR/TR 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

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.

The 1N4754AUR/TR belongs to Microsemi's legacy surface-mount Zener diode family designed specifically for high-density, high-stability voltage regulation in harsh-environment applications where hermeticity, wide temperature range, and radiation tolerance are mandatory.

FAQ

What is the Zener voltage tolerance of the 1N4754AUR/TR?

The 1N4754AUR/TR has a nominal Zener voltage of 39 V with a tolerance of ±5%, indicated by the "A" suffix in the part number. This tolerance is measured at 6.5 mA test current and 30 °C case temperature, and remains stable across its full –65 °C to +175 °C operating range. The 1N4754AUR/TR achieves this via tightly controlled diffusion and passivation processes in Microsemi's Scottsdale fabrication line.

Does the 1N4754AUR/TR require heatsinking in standard PCB layouts?

No, the 1N4754AUR/TR does not require external heatsinking when mounted on FR4 with the manufacturer-recommended pad layout (1 oz copper, specified dimensions on page 3). Its thermal resistance is 130 °C/W junction-to-ambient, allowing full 1.0 W dissipation up to 45 °C ambient. Above that, derating per Figure 1 applies. The 1N4754AUR/TR's DO-213AB glass body efficiently conducts heat to solder joints without thermal vias.

How does the 1N4754AUR/TR differ from the through-hole 1N4754A?

The 1N4754AUR/TR shares identical electrical specifications with the 1N4754A-including 39 V ±5% Zener voltage, 6.5 mA test current, and 23 Ω dynamic impedance-but uses a DO-213AB glass MELF surface-mount package instead of DO-41 axial leads. This gives the 1N4754AUR/TR lower parasitic inductance, better thermal performance on FR4 (130 °C/W vs. 150 °C/W), and compatibility with automated SMT assembly lines.

Is the 1N4754AUR/TR suitable for use in radiation-exposed environments?

Yes, the 1N4754AUR/TR is inherently radiation-hardened per MicroNote 050, validated for total ionizing dose (TID) tolerance exceeding 100 krad(Si) without parameter shift. Its hermetic glass MELF package prevents charge trapping and mitigates single-event effects-making the 1N4754AUR/TR appropriate for satellite power systems, nuclear instrumentation, and high-altitude avionics where radiation exposure is unavoidable.

What does the "TR" suffix indicate in 1N4754AUR/TR?

"TR" denotes tape-and-reel packaging per EIA-481-B standard: 12 mm carrier tape, 1500 units per 7-inch reel. This format enables automated pick-and-place assembly and ensures consistent orientation (cathode band aligned per reel direction). The "UR" prefix confirms surface-mount DO-213AB construction, while "e3" (often co-marked) indicates RoHS-compliant matte-tin termination-fully compatible with lead-free reflow profiles.

1N4754AUR/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AB, MELF (Glass)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 39 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 60 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 29.7 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-213AB (MELF, LL41)

1N4754AUR/TR FAQ

1.How can I place an order for 1N4754AUR/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4754AUR/TR 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 1N4754AUR/TR reliable?

The price and inventory of 1N4754AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4754AUR/TR is usually 5 days.

3.What payment methods are accepted for 1N4754AUR/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4754AUR/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4754AUR/TR?

1N4754AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4754AUR/TR 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 1N4754AUR/TR?

For technical support, including 1N4754AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4754AUR/TR requirements.

6.How does Aetrix verify that 1N4754AUR/TR is sourced from the original manufacturer or authorized distributors?

All 1N4754AUR/TR 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 1N4754AUR/TR meets industry standards.

7.What is the process for return or replacement of 1N4754AUR/TR?

All 1N4754AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4754AUR/TR, 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 1N4754AUR/TR part is unused and in its original packaging.

Return procedure for 1N4754AUR/TR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

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…