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

Nexperia USA Inc. 1N4746A,113

Name: 1N4746A,113
Brand: Nexperia USA Inc.
SKU: 1N4746A,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4746A,113

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: 1N4746A,113.pdf

Description:: DIODE ZENER 18V 1W DO41

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Inventory:4,079

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Product details

Overview

1N4746A,113 from Nexperia is a 18 V ±5 % Zener voltage regulator diode in a hermetically sealed SOD66 (DO-41) glass package, rated for 1000 mW total power dissipation and 13.7 mA working current at 18 V, used for low-voltage stabilization in linear power supplies and reference circuits.

For engineers reviewing the 1N4746A,113 datasheet, 1N4746A,113 pinout, 1N4746A,113 application, or 1N4746A,113 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (110 K/W), reverse current limit (5 µA at 14.4 V), and axial-leaded SOD66 mechanical compatibility with through-hole PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference by maintaining a stable 18 V across its terminals under reverse-biased conditions, with differential resistance of 20 Ω at test current and guaranteed regulation within ±5 % over temperature and life. It requires no external biasing and functions without series resistors in low-current applications.

Designed for thermal equilibrium in still air at 25 °C with 10 mm lead length, it supports junction temperatures from −65 °C to +200 °C and delivers stable regulation up to 500 mA forward current, though typical use is in reverse breakdown with controlled I_Z between 0.25 mA and 13.7 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	18 V nominal, ±5 % tolerance - ensures precise 17.1–18.9 V regulation under specified test conditions
Test Current I_test	14 mA - defines operating point where V_Z and dynamic impedance are measured
Differential Resistance r_dif	20 Ω - determines output impedance and load regulation sensitivity in reference designs
Reverse Current I_R	5 µA max at 14.4 V - sets minimum leakage threshold before breakdown onset
Total Power Dissipation P_tot	1000 mW - defines maximum steady-state thermal load at T_amb = 50 °C
Forward Voltage V_F	1.2 V max at 200 mA - specifies conduction drop when used as rectifier or clamp in forward mode
Junction Temperature Range	−65 °C to +200 °C - enables operation in extended industrial and automotive under-hood environments

Pinout & Package

Hermetically sealed SOD66 (DO-41) axial glass package with 2 leads: cathode identified by a colored band; body diameter 2.6 mm, overall length 25.4 mm, lead spacing per JEDEC DO-41 standard.

Pin/Terminal	Circuit Role	Design Meaning
1 (banded end)	Cathode	Connected to regulated output node; reverse-bias terminal where Zener breakdown occurs
2 (non-banded end)	Anode	Connected to ground or lower-potential rail; completes current path during regulation

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and long-term parameter drift in humid or high-reliability environments
±5 % Zener voltage tolerance	Enables tight reference accuracy without post-manufacture trimming in cost-sensitive analog circuits
110 K/W thermal resistance (j-t)	Supports predictable derating curves for board-level thermal design with 4 mm lead length
20 Ω dynamic impedance at 14 mA	Minimizes output voltage variation under changing load currents in shunt regulator topologies
500 mA absolute max forward current	Allows safe use as transient clamp or low-duty-cycle rectifier without secondary protection

Applications

Linear Power Supply Reference

Overvoltage Protection Clamp

Use Scenario: Stabilizing unregulated DC outputs in discrete 78xx-style regulators or low-power wall adapters.

IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback setpoint for pass transistor bias control.

Use Value: Delivers 18 V ±5 % regulation with <20 Ω output impedance, enabling <1 % load regulation error at 10 mA output swing.

Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback in relay driver circuits.

IC Role / Device Role / Timing Role: Reverse-biased clamping element diverting transient energy above 18 V to ground.

Use Value: Limits voltage excursions to ≤18.9 V with 5 µA leakage at 14.4 V, preserving signal integrity without loading active circuitry.

Temperature-Stable Bias Network

Analog Sensor Excitation Reference

Use Scenario: Generating fixed bias points for op-amp input stages or transistor amplifiers in instrumentation front-ends.

IC Role / Device Role / Timing Role: Precision DC reference source compensating for amplifier offset drift.

Use Value: Maintains 18 V stability across −40 °C to +85 °C ambient with <0.05 %/°C TC implied by ±5 % spec over full range.

Use Scenario: Providing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in data acquisition modules.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source powering sensor elements with minimal self-heating.

Use Value: Enables <0.1 % full-scale measurement accuracy using 18 V reference, supported by 1000 mW power headroom and 20 Ω impedance matching.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4746A-T	Same electrical specs; tape-and-reel packaging (3000 pcs/reel) vs. bulk (113 = 1000 pcs/tape)	Automated SMT assembly compatibility; identical thermal and regulation behavior	Select for pick-and-place production; verify reel orientation and carrier tape compliance
BZX84-C18	SOT-23 surface-mount package; 18 V ±5 %, but lower P_tot = 300 mW and higher r_dif = 40 Ω	Space-constrained PCBs where through-hole mounting is impractical	Use only where power dissipation stays below 250 mW and dynamic impedance >20 Ω is acceptable

Compared with 1N4746A,113, the 1N4746A-T offers identical performance in automated manufacturing, while BZX84-C18 trades package miniaturization for reduced power handling and poorer regulation stiffness-making the original optimal for robust through-hole reference and clamp roles.

Availability

1N4746A,113 is available at Aetrix Electronics and suitable for linear power supply references, overvoltage protection clamps, and analog sensor excitation requiring stable component supply with traceable sourcing and long-lifecycle support.

Supply support for 1N4746A,113 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and sustainability.

The 1N47xxA series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered for cost-effective, high-stability voltage reference and protection in industrial, consumer, and computing power systems.

FAQ

What is the maximum continuous reverse current the 1N4746A,113 can sustain without degradation?

The device is rated for a working current I_Z of 13.7 mA at 18 V, with non-repetitive peak reverse current I_ZSM up to 250 mA. Continuous operation beyond 13.7 mA requires thermal derating per the 110 K/W R_th(j-t) curve and must stay within 1000 mW total dissipation at T_amb ≤ 50 °C.

Can the 1N4746A,113 be used in forward conduction mode like a standard diode?

Yes-it exhibits a forward voltage of ≤1.2 V at 200 mA and supports up to 500 mA absolute maximum forward current. Its low V_F and rugged glass construction make it suitable for low-frequency rectification or polarity protection, though it is optimized for reverse-bias regulation.

How does the SOD66 (DO-41) package affect PCB layout and thermal management?

The axial SOD66 package requires through-hole mounting with 10 mm lead length for datasheet-compliant thermal testing. To achieve rated 1000 mW dissipation, maintain ≥2 mm clearance from adjacent components and use copper pour on both sides connected to anode/cathode pads to enhance heat spreading.

Is the 1N4746A,113 RoHS compliant and halogen-free?

Yes-Nexperia certifies the 1N4746A,113 as RoHS compliant (2011/65/EU) and halogen-free per IEC 61249-2-21, with lead-free terminations and compliant packaging materials documented in the official product change notification PN190118.

1N4746A,113 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 18 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 20 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 13.7 V

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

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

1N4746A,113 FAQ

1.How can I place an order for 1N4746A,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4746A,113 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 1N4746A,113 reliable?

The price and inventory of 1N4746A,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4746A,113 is usually 5 days.

3.What payment methods are accepted for 1N4746A,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4746A,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4746A,113?

1N4746A,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4746A,113 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 1N4746A,113?

For technical support, including 1N4746A,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4746A,113 requirements.

6.How does Aetrix verify that 1N4746A,113 is sourced from the original manufacturer or authorized distributors?

All 1N4746A,113 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 1N4746A,113 meets industry standards.

7.What is the process for return or replacement of 1N4746A,113?

All 1N4746A,113 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4746A,113, 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 1N4746A,113 part is unused and in its original packaging.

Return procedure for 1N4746A,113:

1.Submit a request within 90 days.

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

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