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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Zener Diode Arrays

Diodes Incorporated AZ23C18-7-F

Name: AZ23C18-7-F
Brand: Diodes Incorporated
SKU: AZ23C18-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AZ23C18-7-F

Manufacturer:: Diodes Incorporated

Category:: Zener Diode Arrays

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AZ23C18-7-F.pdf

Description:: DIODE ZENER ARRAY 18V SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:13,336

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Product details

Overview

AZ23C18-7-F from Diodes Incorporated is a dual 300mW surface-mount Zener diode in common-anode configuration with nominal zener voltage 18V (16.8–19.1V range), ±5% matching between diodes, and temperature coefficient +0.090%/°C - used for precision voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the AZ23C18-7-F datasheet, AZ23C18-7-F pinout, AZ23C18-7-F application, or AZ23C18-7-F equivalent, key selection criteria include matched dual-zener tolerance, SOT23 thermal resistance (417°C/W), JEDEC-qualified reliability, and automotive-grade availability via Q-suffix variants.

Technical Context

This dual Zener operates in reverse breakdown mode with two anodes tied internally and separate cathodes (pins 1 and 3), enabling independent regulation paths sharing one thermal node. Its 300mW power rating is derated linearly above 25°C per Fig. 1, and it maintains ≤5% V_Z mismatch between channels at I_ZT = 5mA.

The device exhibits low dynamic impedance (Z_ZT = 50Ω typical at 5mA, Z_ZK = 170Ω at 1mA) and stable temperature coefficient (+0.090%/°C), supporting accurate voltage clamping across –65°C to +150°C operating range without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage	16.8–19.1 V at 5 mA - defines regulated output range for feedback or clamp circuits
Power Dissipation	300 mW - sets maximum continuous DC power handling on FR-4 board with recommended pad layout
Zener Impedance	50 Ω typical at 5 mA - determines regulation error under load transients
Temperature Coefficient	+0.090 %/°C - quantifies V_Z drift with ambient temperature change
Reverse Leakage	≤0.1 µA at 14.0 V - ensures minimal quiescent current in high-impedance bias networks
Thermal Resistance	417 °C/W junction-to-ambient - governs temperature rise under steady-state power dissipation

Pinout & Package

Package: SOT23 - surface-mount plastic package with matte tin-plated alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rated molding compound, and 0.008 g mass.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Cathode of Zener 1	Provides first regulated output path; connects to load or feedback node requiring 18V reference
Pin 2	Common Anode	Shared anode connection point; must be tied to system ground or negative rail for both diodes to conduct
Pin 3	Cathode of Zener 2	Enables second independent 18V regulation path; supports redundancy or dual-rail sensing

Key Features

Feature	Design Value
Dual Zeners, Common Anode	Enables compact dual-voltage reference or redundant clamping in single SOT23 footprint
V_Z Matching ≤5%	Ensures consistent regulation between channels without calibration in matched-sensing applications
JEDEC High-Reliability Qualification	Validated per AEC-Q101 (HBM 8kV, MM 400V) and IEC 61000-4-2 (air 15kV/contact 8kV)
Lead-Free & Halogen-Free	Complies with RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br+Cl, <1000ppm Sb)

Applications

Switch-Mode Power Supply Feedback

Industrial Sensor Signal Conditioning

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

IC Role / Device Role / Timing Role: Dual Zener provides precise 18V reference for TL431-like shunt regulator IC or direct comparator threshold.

Use Value: Matched V_Z ensures consistent feedback setpoint across dual-output rails; low Z_ZT minimizes load-regulation error.

Use Scenario: Protecting analog front-end inputs of 24V industrial PLC modules against transient overvoltage.

IC Role / Device Role / Timing Role: Clamps sensor input lines to 18V while preserving signal integrity via low leakage (<0.1µA).

Use Value: Common-anode topology allows bidirectional clamping with single ground tie; SOT23 enables dense PCB layout near connectors.

Automotive Body Control Module

Medical Equipment Power Monitoring

Use Scenario: Providing redundant voltage references for microcontroller ADC reference and watchdog timer threshold in BCM ECUs.

IC Role / Device Role / Timing Role: Dual Zener supplies independent 18V references to two safety-critical subsystems sharing thermal environment.

Use Value: ≤5% V_Z matching eliminates need for individual trimming; AEC-Q101 qualification supports PPAP compliance.

Use Scenario: Monitoring auxiliary 18V DC power rail in portable ultrasound devices with strict low-power requirements.

IC Role / Device Role / Timing Role: Acts as precision undervoltage lockout (UVLO) detector with hysteresis via comparator interface.

Use Value: Stable +0.090%/°C TC ensures reliable trip point across clinical operating temperatures (0–40°C).

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-Zener voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX79-C18 (Nexperia)	Single Zener, 400mW, ±5% tolerance, no dual-element matching	Requires two discrete devices for dual-path use; higher board area and thermal variance	Select when only one 18V reference is needed and cost-per-device is prioritized over matching
DZ23C18-7-F (Diodes Inc.)	Common-cathode dual Zener (vs. AZ23's common-anode); same V_Z range and SOT23 package	Reverses polarity logic: cathodes tied, anodes used - requires redesign of ground/reference node connections	Choose for designs already using common-cathode topology or needing inverted regulation polarity

Compared with BZX79-C18 and DZ23C18-7-F, AZ23C18-7-F uniquely delivers matched dual-channel regulation in common-anode configuration - critical for space-constrained, thermally coupled feedback or protection circuits where channel correlation matters.

Availability

AZ23C18-7-F is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and medical power monitoring systems requiring stable component supply with JEDEC-qualified reliability and RoHS-compliant packaging.

Supply support for AZ23C18-7-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AZ23 series belongs to Diodes' precision Zener diode product line, engineered specifically for high-matching, high-reliability voltage reference and overvoltage protection in automotive, industrial, and computing power systems.

FAQ

What is the maximum continuous power dissipation for AZ23C18-7-F?

The AZ23C18-7-F has a maximum power dissipation of 300 mW at 25°C ambient, derating linearly to zero at 150°C per the curve in Figure 1 of DS18003. This rating assumes mounting on FR-4 PCB with Diodes' recommended pad layout (2.0 mm × 0.9 mm thermal pad).

How is the common-anode configuration implemented in the SOT23 package?

In the AZ23C18-7-F, Pin 2 is the internal common anode connection shared by both Zener elements; Pins 1 and 3 are the independent cathodes. This allows both diodes to regulate simultaneously when Pin 2 is grounded, with each cathode delivering a regulated 18V output relative to that ground.

Does AZ23C18-7-F meet automotive qualification standards?

The standard AZ23C18-7-F is qualified to JEDEC high-reliability standards and AEC-Q101 for ESD robustness, but is not automotive-grade certified. For automotive use, select the Q-suffix variant (e.g., AZ23C18-Q-7-F), which adds full AEC-Q200 qualification, PPAP capability, and IATF 16949 manufacturing compliance.

What is the typical zener impedance at low test current?

At I_ZK = 1.0 mA, the typical zener impedance (Z_ZK) is 170 Ω - significantly higher than the 50 Ω measured at I_ZT = 5 mA. This reflects increased dynamic resistance near knee voltage and must be accounted for in low-current bias or precision threshold applications.

AZ23C18-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Configuration:: 1 Pair Common Anode

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

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 50 Ohms

Current - Reverse Leakage @ Vr:: -

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

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AZ23C18-7-F FAQ

1.How can I place an order for AZ23C18-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for AZ23C18-7-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 AZ23C18-7-F reliable?

The price and inventory of AZ23C18-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ23C18-7-F is usually 5 days.

3.What payment methods are accepted for AZ23C18-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ23C18-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AZ23C18-7-F?

AZ23C18-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AZ23C18-7-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 AZ23C18-7-F?

For technical support, including AZ23C18-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ23C18-7-F requirements.

6.How does Aetrix verify that AZ23C18-7-F is sourced from the original manufacturer or authorized distributors?

All AZ23C18-7-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 AZ23C18-7-F meets industry standards.

7.What is the process for return or replacement of AZ23C18-7-F?

All AZ23C18-7-F units undergo pre-shipment inspection (PSI). If there is an issue with AZ23C18-7-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 AZ23C18-7-F part is unused and in its original packaging.

Return procedure for AZ23C18-7-F:

1.Submit a request within 90 days.

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

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