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 > Zener Diode Arrays

Diodes Incorporated AZ23C18W-7-F

Name: AZ23C18W-7-F
Brand: Diodes Incorporated
SKU: AZ23C18W-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AZ23C18W-7-F

Manufacturer:: Diodes Incorporated

Category:: Zener Diode Arrays

Package:: SC-70, SOT-323

Datasheet:: AZ23C18W-7-F.pdf

Description:: DIODE ZENER ARRAY 18V SOT323

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,276

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

Product details

Overview

AZ23C18W-7-F from Diodes Incorporated is a dual anode, single cathode 18 V Zener diode in SOT-323 package, rated for 200 mW power dissipation, 50 Ω maximum Zener impedance at 5 mA, and ±12.4 to ±16.0 mV/°C temperature coefficient - used for precision voltage reference and transient suppression in low-power sensor interfaces.

For engineers reviewing the AZ23C18W-7-F datasheet, AZ23C18W-7-F pinout, AZ23C18W-7-F application, or AZ23C18W-7-F equivalent, key selection criteria include nominal Zener voltage (18 V), Zener test current (5 mA), max reverse leakage (0.1 μA @ 14.4 V), thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This dual-anode Zener diode operates in reverse breakdown with tightly controlled 16.8–19.1 V Zener voltage range at I_ZT = 5 mA. Its ultra-small SOT-323 package supports high-density PCB layouts while maintaining 8 kV HBM ESD robustness per AEC-Q101.

The device exhibits 12.6 mV/°C typical temperature coefficient and 170 Ω max knee impedance at I_ZK = 1 mA, enabling stable regulation under varying ambient conditions from –65 °C to +150 °C without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	18 V nominal, 16.8–19.1 V range at 5 mA - defines regulated output voltage tolerance in reference circuits
Power Dissipation (P_D)	200 mW at T_A = 25 °C - limits continuous operating current to ~11 mA at 18 V
Zener Impedance (Z_ZT)	50 Ω max at 5 mA - determines regulation stiffness against load transients
Reverse Leakage (I_R)	0.1 μA max at 14.4 V - ensures minimal quiescent current in battery-powered systems
Temp Coefficient (TC)	+12.4 to +16.0 mV/°C - requires thermal design margin for >10 °C ambient shifts
ESD Rating (HBM)	8 kV per AEC-Q101 - enables direct placement on I/O lines without added protection
Package	SOT-323 - 2.2 × 1.35 × 0.9 mm footprint with gull-wing leads for reflow compatibility

Pinout & Package

SOT-323 package with three terminals: Cathode (center pin), Anode 1 (left pin), Anode 2 (right pin) - dual-anode configuration allows bidirectional clamping or dual-rail referencing.

Pin/Terminal	Circuit Role	Design Meaning
Anode 1	First Zener anode connection	Enables independent reverse-bias operation with Cathode for primary 18 V clamp path
Cathode	Common Zener cathode	Shared terminal for both Zener junctions; must be connected to higher-potential rail
Anode 2	Second Zener anode connection	Supports redundant clamping or dual-voltage reference sharing same cathode node

Key Features

Feature	Design Value
Dual-anode Zener topology	Enables single-device bidirectional transient suppression or dual-rail voltage reference without discrete pairing
AEC-Q101 qualified	Validated for automotive under-hood applications including engine control sensors and body electronics
Green molding compound	Halogen-free, RoHS-compliant construction meeting UL 94V-0 flammability rating
Low thermal resistance	625 °C/W junction-to-ambient enables operation up to +125 °C ambient with derated power
High ESD immunity	8 kV HBM and 8 kV IEC 61000-4-2 contact discharge support direct I/O line protection

Applications

Automotive Sensor Reference

Industrial Analog Input Protection

Use Scenario: Stable 18 V reference for analog front-end of engine coolant temperature sensor in engine control unit.

IC Role / Device Role / Timing Role: Precision voltage reference and overvoltage clamp for ADC input stage.

Use Value: Maintains <±1% reference accuracy across –40 to +125 °C due to matched TC and low leakage.

Use Scenario: Transient suppression on 4–20 mA current loop input of PLC analog module exposed to field wiring surges.

IC Role / Device Role / Timing Role: Bidirectional clamping device protecting op-amp input against ±1 kV EFT bursts.

Use Value: Dual-anode structure absorbs positive and negative transients without polarity-sensitive layout.

Portable Medical Sensor Bias

Smart Meter Voltage Monitor

Use Scenario: Low-power bias supply for photodiode amplifier in handheld pulse oximeter.

IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) Zener reference establishing photodiode reverse bias voltage.

Use Value: Enables >10-year battery life by minimizing standby current in always-on sensing mode.

Use Scenario: Overvoltage detection threshold in electricity meter microcontroller's auxiliary supply monitoring circuit.

IC Role / Device Role / Timing Role: Zener-based comparator reference triggering brown-out reset at 18 V ±5%.

Use Value: Tight 16.8–19.1 V V_Z tolerance eliminates need for trimming resistors in production calibration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference and transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C18LT1G	Single-anode 18 V Zener, 350 mW rating, 40 Ω Z_ZT, SOT-23 package	Lacks dual-anode topology; requires two devices for bidirectional clamping	Select when higher power margin is needed and board space permits discrete pairing
MMSZ5245B-7-F	Single-anode 18 V Zener, 350 mW, 30 Ω Z_ZT, SOD-123 package	No AEC-Q101 qualification; lower ESD rating (4 kV HBM)	Prefer for cost-sensitive industrial applications where automotive qualification is not required

Compared with BZX84-C18LT1G and MMSZ5245B-7-F, AZ23C18W-7-F uniquely delivers dual-anode functionality in SOT-323 with AEC-Q101 validation - critical for space-constrained automotive sensor nodes requiring single-device bidirectional protection and reference stability.

Availability

AZ23C18W-7-F is available at Aetrix Electronics and suitable for automotive sensor reference, industrial analog input protection, portable medical sensor bias, and smart meter voltage monitor applications requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AZ23C18W-7-F 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 automotive, industrial, and consumer markets.

AZ23C18W-7-F belongs to the AZ23 series of dual-anode Zener diodes designed specifically for compact, AEC-Q101-compliant voltage reference and transient suppression in harsh-environment electronics.

FAQ

What is the maximum reverse current specification for AZ23C18W-7-F at 14.4 V?

The maximum reverse current (I_R) is 0.1 μA at V_R = 14.4 V, measured per the datasheet's Electrical Characteristics table. This ultra-low leakage supports energy-efficient designs in battery-powered applications where standby current must remain below 100 nA.

Can AZ23C18W-7-F be used for bidirectional ESD protection?

Yes - its dual-anode, single-cathode configuration allows it to clamp both positive and negative transients relative to the cathode node. When the cathode is tied to V_CC, Anode 1 protects against negative excursions and Anode 2 against positive excursions, enabling single-device bidirectional I/O protection.

Is AZ23C18W-7-F compliant with lead-free and RoHS requirements?

Yes - it features matte tin plating over Alloy 42 leadframe and green molding compound compliant with RoHS Directive 2011/65/EU and J-STD-020D moisture sensitivity level 1. No purposefully added lead, halogens, or antimony trioxide flame retardants are used in production units dated 2006 week 27 or later.

What is the thermal resistance value for AZ23C18W-7-F on FR4 board?

The junction-to-ambient thermal resistance (R_θJA) is 625 °C/W when mounted on FR4 PCB using the recommended pad layout per Diodes Inc. Application Note AP02001. This value assumes standard 1 oz copper, no thermal vias, and natural convection cooling.

AZ23C18W-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Configuration:: 1 Pair Common Anode

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

Tolerance:: ±5%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 50 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 12.6 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

AZ23C18W-7-F FAQ

1.How can I place an order for AZ23C18W-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for AZ23C18W-7-F 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 AZ23C18W-7-F reliable?

The price and inventory of AZ23C18W-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ23C18W-7-F is usually 5 days.

3.What payment methods are accepted for AZ23C18W-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ23C18W-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AZ23C18W-7-F?

AZ23C18W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AZ23C18W-7-F 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 AZ23C18W-7-F?

For technical support, including AZ23C18W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ23C18W-7-F requirements.

6.How does Aetrix verify that AZ23C18W-7-F is sourced from the original manufacturer or authorized distributors?

All AZ23C18W-7-F 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 AZ23C18W-7-F meets industry standards.

7.What is the process for return or replacement of AZ23C18W-7-F?

All AZ23C18W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with AZ23C18W-7-F, 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 AZ23C18W-7-F part is unused and in its original packaging.

Return procedure for AZ23C18W-7-F:

1.Submit a request within 90 days.

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

Tech Hub

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…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…