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

Taiwan Semiconductor Corporation 1N4747A

Name: 1N4747A
Brand: Taiwan Semiconductor Corporation
SKU: 1N4747A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 1N4747A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

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

Datasheet:: 1N4747A.pdf

Description:: DIODE ZENER 20V 1W DO204AL

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,711

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

Product details

Overview

1N4747A from Taiwan Semiconductor is a 1 W, 20 V ±5% Zener diode in DO-41 package, designed for precision voltage regulation and overvoltage protection in DC power supplies and reference circuits. It delivers 22 mA test current, 12.5 Ω dynamic impedance at IZT, 15.2 V minimum clamping voltage at 5 μA leakage, and operates from –55°C to +150°C.

For engineers reviewing the 1N4747A datasheet, 1N4747A pinout, 1N4747A application, or 1N4747A equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (θ_JL), surge current rating (225 A), low leakage (<5 μA at 15.2 V), and AEC-Q101 qualification availability.

Technical Context

The 1N4747A operates as a single-die, silicon planar Zener diode with glass-passivated junction, enabling stable reverse-breakdown behavior under regulated DC bias. Its 20 V nominal Zener voltage is specified at 22 mA test current (IZT), with dynamic impedance of 12.5 Ω measured using 10% RMS AC superimposed on IZT at 1 kHz.

Thermal performance is defined by a maximum junction temperature of 150°C and a derating slope of 6.67 mW/°C above 50°C on a 5 mm × 5 mm copper pad. Leakage current remains below 5 μA at 15.2 V (80% of nominal V_Z), supporting low-power standby regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z @ I_ZT	19.0–21.0 V at 22 mA - defines tight regulation window for 20 V reference designs
Zener Impedance Z_ZT	12.5 Ω - ensures minimal output voltage variation under load transients
Power Dissipation P_tot	1 W at 50°C ambient - sets continuous DC power limit before thermal derating applies
Leakage Current I_R	<5 μA at 15.2 V - enables low-quiescent-current biasing in high-impedance circuits
Surge Current I_SM	225 A (non-repetitive, 1/120 s) - supports transient overvoltage suppression without failure
Junction Temperature Range	–55°C to +150°C - qualifies for industrial and automotive under-hood environments
Package	DO-204AL (DO-41) - industry-standard axial leaded package with tin-plated leads per J-STD-002

Pinout & Package

DO-204AL (DO-41) package: axial-leaded, glass-passivated, RoHS-compliant, halogen-free molding compound rated UL 94V-0; cathode indicated by band; weight ≈0.300 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference node	Connected to lower-potential side in shunt regulation; forms return path for I_ZT
Cathode	Zener breakdown terminal / regulation output node	Connected to regulated rail; voltage clamped to V_Z when reverse-biased above breakdown threshold

Key Features

Feature	Design Value
Glass-passivated chip junction	Enhances long-term stability and moisture resistance for harsh-environment reliability
Built-in strain relief	Reduces mechanical stress at lead-to-package interface during board flex or thermal cycling
Low inductance construction	Minimizes voltage overshoot during fast transient suppression (e.g., ESD or switching noise)
AEC-Q101 qualified option available	Validated for automotive electronics per stress-test requirements including HTOL and TC
Pure tin-plated leads	Ensures solderability and compatibility with lead-free reflow processes per J-STD-002

Applications

DC Power Supply Regulation	Overvoltage Protection Circuit
Use Scenario: Stabilizing +20 V rail in linear regulator feedback loop or post-regulation reference stage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20 V setpoint for error amplifier input. Use Value: ±5% V_Z tolerance and 12.5 Ω Z_ZT ensure <±100 mV output deviation across load and line variations.	Use Scenario: Clamping microcontroller I/O lines against 24 V field transients in industrial PLC modules. IC Role / Device Role / Timing Role: Standby-mode overvoltage clamp activated only during fault conditions. Use Value: 225 A non-repetitive surge rating absorbs energy from inductive kickback without degradation.
Temperature-Stable Voltage Reference	Automotive Sensor Biasing
Use Scenario: Generating fixed 20 V bias for precision op-amp circuits operating across –40°C to +125°C. IC Role / Device Role / Timing Role: Primary reference source with compensated thermal drift via matched Zener design. Use Value: Specified temperature coefficient curve (Fig.7) enables predictable drift modeling up to 150°C junction.	Use Scenario: Providing regulated excitation voltage to resistive temperature sensors (RTDs) in engine control units. IC Role / Device Role / Timing Role: Low-leakage shunt regulator maintaining sensor bridge accuracy under battery voltage fluctuations. Use Value: <5 μA leakage at 15.2 V prevents measurement error in high-impedance sensor interfaces.

DC Power Supply Regulation

Overvoltage Protection Circuit

Use Scenario: Stabilizing +20 V rail in linear regulator feedback loop or post-regulation reference stage.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20 V setpoint for error amplifier input.

Use Value: ±5% V_Z tolerance and 12.5 Ω Z_ZT ensure <±100 mV output deviation across load and line variations.

Use Scenario: Clamping microcontroller I/O lines against 24 V field transients in industrial PLC modules.

IC Role / Device Role / Timing Role: Standby-mode overvoltage clamp activated only during fault conditions.

Use Value: 225 A non-repetitive surge rating absorbs energy from inductive kickback without degradation.

Temperature-Stable Voltage Reference

Automotive Sensor Biasing

Use Scenario: Generating fixed 20 V bias for precision op-amp circuits operating across –40°C to +125°C.

IC Role / Device Role / Timing Role: Primary reference source with compensated thermal drift via matched Zener design.

Use Value: Specified temperature coefficient curve (Fig.7) enables predictable drift modeling up to 150°C junction.

Use Scenario: Providing regulated excitation voltage to resistive temperature sensors (RTDs) in engine control units.

IC Role / Device Role / Timing Role: Low-leakage shunt regulator maintaining sensor bridge accuracy under battery voltage fluctuations.

Use Value: <5 μA leakage at 15.2 V prevents measurement error in high-impedance sensor interfaces.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4747A-T (ON Semiconductor)	Same 20 V ±5%, 1 W rating; DO-41 package; typical Z_ZT = 13 Ω at 22 mA	Identical functional role; minor Z_ZT variance has negligible impact on most regulation circuits	Select when ON Semi supply chain alignment or dual-sourcing is required
BZX55-C20 (Vishay)	20 V ±5%, 500 mW rating; DO-35 package; Z_ZT = 25 Ω at 5 mA	Lower power and higher impedance limit use to low-current references or signal-level clamping	Choose only for space-constrained layouts where 500 mW suffices and thermal margin allows

Compared with 1N4747A, the ON Semiconductor 1N4747A-T offers near-identical electrical behavior and drop-in mechanical compatibility, while the Vishay BZX55-C20 requires derating for power and impedance-sensitive designs due to its lower P_tot and higher Z_ZT.

Availability

1N4747A is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, temperature-stable voltage references, and automotive sensor biasing requiring stable component supply and full traceability.

Supply support for 1N4747A 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components for industrial and automotive markets.

The 1N47xxA series was developed to deliver cost-effective, high-reliability Zener diodes with AEC-Q101 qualification capability and consistent parametric performance across voltage grades from 10 V to 200 V.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4747A?

The 1N4747A has a nominal Zener voltage of 20 V with a standard tolerance of ±5%, meaning the actual breakdown voltage falls between 19.0 V and 21.0 V when measured at 22 mA test current (I_ZT) and 25°C ambient. This tolerance is guaranteed per JEDEC registration and applies to all units unless tighter tolerances are specially ordered.

Does the 1N4747A have AEC-Q101 qualification?

The base 1N4747A is not automatically AEC-Q101 qualified; however, Taiwan Semiconductor offers an AEC-Q101-qualified version designated as 1N4747AH (or 1N4747AHA0G for ammo-packaged units). This variant undergoes accelerated stress testing per AEC-Q101 standards and is intended for automotive applications requiring enhanced reliability validation.

What is the maximum surge current rating for the 1N4747A?

The 1N4747A supports a non-repetitive peak reverse surge current of 225 A, defined for a 1/120 second (≈8.3 ms) half-sine or equivalent waveform. This rating assumes proper PCB layout with adequate copper area for thermal dissipation and is validated per JEDEC test conditions in the official datasheet.

How does the 1N4747A compare to the 1N4746A and 1N4748A in terms of Zener voltage and impedance?

The 1N4746A is rated at 18 V ±5% (17.1–18.9 V) with Z_ZT = 14.0 Ω at 20 mA, while the 1N4748A is rated at 22 V ±5% (20.9–23.1 V) with Z_ZT = 11.5 Ω at 23 mA. The 1N4747A sits between them at 20 V ±5% with Z_ZT = 12.5 Ω at 22 mA - offering a balanced trade-off of voltage level and dynamic impedance for mid-range regulation needs.

What is the thermal derating behavior of the 1N4747A above 50°C ambient?

The 1N4747A must be derated linearly above 50°C ambient temperature at 6.67 mW/°C when mounted on a 5 mm × 5 mm copper pad. At 100°C ambient, its usable power drops to 667 mW; at 150°C, it reaches zero allowable dissipation. This derating ensures junction temperature stays within the absolute maximum of 150°C under defined PCB thermal conditions.

1N4747A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 20 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 70 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 15.2 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

1N4747A FAQ

1.How can I place an order for 1N4747A through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4747A 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 1N4747A reliable?

The price and inventory of 1N4747A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747A is usually 5 days.

3.What payment methods are accepted for 1N4747A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4747A?

1N4747A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4747A 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 1N4747A?

For technical support, including 1N4747A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747A requirements.

6.How does Aetrix verify that 1N4747A is sourced from the original manufacturer or authorized distributors?

All 1N4747A 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 1N4747A meets industry standards.

7.What is the process for return or replacement of 1N4747A?

All 1N4747A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747A, 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 1N4747A part is unused and in its original packaging.

Return procedure for 1N4747A:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

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…