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

Diodes Incorporated DZ23C18-7

Name: DZ23C18-7
Brand: Diodes Incorporated
SKU: DZ23C18-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DZ23C18-7

Manufacturer:: Diodes Incorporated

Category:: Zener Diode Arrays

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

Datasheet:: DZ23C18-7.pdf

Description:: DIODE ZENER ARRAY 18V SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,052

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Product details

Overview

DZ23C18-7 from Diodes Incorporated is a dual common-cathode 300mW surface-mount Zener diode with nominal zener voltage 18V (16.8–19.1V range), ±5% matching between dual elements, and 50Ω typical zener impedance at 5mA. It operates from −65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops and analog sensor biasing circuits.

For engineers reviewing the DZ23C18-7 datasheet, DZ23C18-7 pinout, DZ23C18-7 application, or DZ23C18-7 equivalent, this part supports dual-voltage regulation in space-constrained designs where matched breakdown characteristics and thermal stability are critical - especially in industrial power monitors and automotive body-control modules requiring JEDEC-qualified reliability.

Technical Context

This dual Zener implements two independent 18V zener junctions sharing a common cathode terminal, enabling differential reference generation or redundant clamping in single-supply systems. Its matched V_Z tolerance (≤5%) and low temperature coefficient (+0.090%/°C) support stable voltage tracking across temperature.

The SOT23 package delivers 417°C/W junction-to-ambient thermal resistance on FR4 PCBs with recommended pad layout, supporting continuous 300mW dissipation only below 50°C ambient. Reverse leakage remains ≤0.1µA at 14.0V minimum reverse voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	18V (16.8–19.1V range at I_ZT = 5mA); enables precise 18V rail regulation or clamping
Power Dissipation	300mW; supports sustained operation in compact SOT23 footprint without forced cooling
Zener Impedance	50Ω typical at 5mA; ensures minimal output voltage variation under load transients
Voltage Matching	≤5% ΔV_Z between dual elements; allows accurate differential or ratiometric reference design
Temperature Coefficient	+0.090%/°C; provides predictable, monotonic V_Z drift over full operating range
Minimum Reverse Voltage	14.0V at I_R = 0.1µA; guarantees reliable turn-on margin before breakdown conduction
Operating Temperature	−65°C to +150°C; qualified for under-hood automotive and industrial control environments

Pinout & Package

Package: SOT23 - molded plastic case, UL 94V-0 rated, 0.008g weight, matte tin-plated alloy 42 lead frame, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode A)	First Zener Anode	Connects to first 18V zener junction; reverse-biased to generate reference voltage
Pin 2 (Cathode)	Common Cathode	Shared cathode node for both zeners; ties to regulated rail or ground reference point
Pin 3 (Anode B)	Second Zener Anode	Connects to second 18V zener junction; enables matched dual-reference or redundancy

Key Features

Feature	Design Value
Dual common-cathode configuration	Enables compact dual-reference generation without external node tying; reduces PCB routing complexity
≤5% inter-device V_Z matching	Supports high-accuracy ratiometric sensing and differential clamp applications without trimming
JEDEC-qualified reliability	Meets high-reliability standards per AEC-Q stress test references; suitable for mission-critical power monitoring
Lead-free & halogen-free "Green" construction	Complies with RoHS 2/3 and automotive PPAP requirements; eliminates hazardous material compliance risk
SOT23 automated insertion compatibility	Standardized footprint and terminal geometry enable high-yield pick-and-place assembly

Applications

Industrial Power Monitor

Automotive Body Control Module

Use Scenario: Monitoring 24V battery rail voltage in PLC I/O modules with dual ADC reference paths.

IC Role / Device Role / Timing Role: Dual Zener provides matched 18V references for two independent ADC channels, rejecting common-mode noise.

Use Value: ≤5% V_Z matching eliminates calibration offset between channels, improving system-level measurement accuracy.

Use Scenario: Overvoltage protection for LIN bus transceiver supply in door module ECUs.

IC Role / Device Role / Timing Role: Clamps transient spikes above 18V while maintaining low leakage (<0.1µA) during normal 12V operation.

Use Value: Common-cathode topology allows single-point grounding of both clamps, minimizing ground bounce during ESD events.

Medical Sensor Bias Supply

Programmable Logic Controller Input Stage

Use Scenario: Generating stable bias for piezoresistive pressure sensor bridges in portable diagnostic devices.

IC Role / Device Role / Timing Role: Supplies matched 18V excitation to bridge arms; temperature coefficient ensures consistent sensitivity across operating range.

Use Value: +0.090%/°C TC minimizes zero-point drift in sensor output, reducing need for software compensation.

Use Scenario: Voltage translation and surge suppression for 24V digital input conditioning circuits.

IC Role / Device Role / Timing Role: Acts as dual-clamp to limit input voltage to downstream optocoupler and Schmitt trigger stages.

Use Value: 300mW rating sustains repetitive 100ns transients up to 30V without degradation, extending field lifetime.

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 18V Zener in DO-35; no dual-element or matching spec	Requires two discrete devices and external matching; larger footprint	Select when cost-per-diode is prioritized over board area and matching performance
DZ23C18-7-F (Diodes Inc.)	Same electrical specs; "-F" suffix denotes tape-and-reel packaging only	No functional difference; identical die and marking	Choose for automated production where reel packaging aligns with SMT line requirements

Compared with BZX79-C18 and DZ23C18-7-F, the DZ23C18-7 uniquely delivers matched dual 18V references in one SOT23 package - reducing component count by 50% and eliminating manual matching, while maintaining JEDEC reliability and automotive-grade process controls.

Availability

DZ23C18-7 is available at Aetrix Electronics and suitable for industrial power monitors, automotive body control modules, medical sensor bias supplies, and programmable logic controller input stages requiring stable component supply with guaranteed long-term continuity.

Supply support for DZ23C18-7 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 computing markets.

The DZ23 series targets space-constrained, high-stability voltage reference and protection applications - designed specifically for dual-element matching, SMT automation, and extended-temperature operation in harsh environments.

FAQ

What is the maximum continuous power dissipation for DZ23C18-7 at 70°C ambient?

At 70°C ambient, derating begins at 50°C per Figure 1. The linear derating slope is 300mW × (1 − (70−50)/500) = 240mW. This assumes FR4 PCB with Diodes' recommended pad layout; exceeding this risks thermal runaway or parametric shift.

Can DZ23C18-7 be used as a single 18V Zener by leaving one anode unconnected?

Yes - Pin 1 or Pin 3 may be left floating without affecting the other zener's performance. However, the unused anode must be electrically isolated (not shorted or tied to any potential), as leakage current could perturb the active junction's regulation behavior.

Is DZ23C18-7 qualified for automotive AEC-Q200 stress testing?

No - DZ23C18-7 is commercial-grade. For automotive qualification, use the Q-suffix variant DZ23C18Q-7-F, which is manufactured in IATF 16949 facilities and meets AEC-Q200 requirements including temperature cycling and humidity testing.

What is the typical capacitance between anode and cathode terminals?

Per Figure 5, total capacitance is ~15pF at 18V nominal zener voltage. This value remains stable across bias conditions and supports high-frequency transient suppression up to ~100MHz without resonance issues in properly decoupled layouts.

DZ23C18-7 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:: Discontinued at Digi-Key

Configuration:: 1 Pair Common Cathode

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

DZ23C18-7 FAQ

1.How can I place an order for DZ23C18-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DZ23C18-7 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 DZ23C18-7 reliable?

The price and inventory of DZ23C18-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DZ23C18-7 is usually 5 days.

3.What payment methods are accepted for DZ23C18-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DZ23C18-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DZ23C18-7?

DZ23C18-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DZ23C18-7 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 DZ23C18-7?

For technical support, including DZ23C18-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DZ23C18-7 requirements.

6.How does Aetrix verify that DZ23C18-7 is sourced from the original manufacturer or authorized distributors?

All DZ23C18-7 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 DZ23C18-7 meets industry standards.

7.What is the process for return or replacement of DZ23C18-7?

All DZ23C18-7 units undergo pre-shipment inspection (PSI). If there is an issue with DZ23C18-7, 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 DZ23C18-7 part is unused and in its original packaging.

Return procedure for DZ23C18-7:

1.Submit a request within 90 days.

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

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