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Diodes Incorporated AZ23C18-7
- Part No.:
- AZ23C18-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ23C18-7.pdf
- Description:
- DIODE ZENER ARRAY 18V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,526
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Product details
Overview
AZ23C18-7 from Diodes Incorporated is a dual common-anode 18 V Zener diode pair in SOT23 package, rated for 300 mW total power dissipation, with ±5% matching between zener voltages (16.8–19.1 V), 50 Ω typical zener impedance at 5 mA, and +0.090 %/°C temperature coefficient - used for precision voltage reference and overvoltage clamping in DC power rail monitoring circuits.
For engineers reviewing the AZ23C18-7 datasheet, AZ23C18-7 pinout, AZ23C18-7 application, or AZ23C18-7 equivalent, key selection criteria include matched dual-zener tolerance, thermal resistance (417 °C/W), JEDEC-qualified reliability, RoHS/Green compliance, and SOT23 footprint compatibility with automated assembly.
Technical Context
This dual Zener operates in reverse breakdown mode with two anodes tied internally and separate cathodes, enabling independent regulation or differential clamping. Its matched voltage tracking (≤5% ΔVZ) supports ratiometric sensing and dual-rail protection schemes.
The device exhibits low leakage (<0.1 µA at 14.0 V), stable TC behavior (+0.090 %/°C), and maintains specified impedance up to 150 °C junction temperature - validated per AEC-Q101 (HBM 8 kV, MM 400 V) and IEC 61000-4-2 (air 15 kV, contact 8 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Range | 16.8–19.1 V at 5 mA - defines usable regulation window for 18 V nominal rail stabilization |
| Max Power Dissipation | 300 mW - limits continuous current to ~16.7 mA at 18 V without heatsinking |
| Zener Impedance | 50 Ω typical at 5 mA - ensures <±0.25 V output shift under ±12.5 mA load variation |
| Temperature Coefficient | +0.090 %/°C - adds ~±0.16 V drift across –65°C to +150°C operating range |
| Reverse Leakage | <0.1 µA at 14.0 V - guarantees minimal quiescent current in standby voltage monitor circuits |
| Thermal Resistance | 417 °C/W - requires derating to ~180 mW at 85°C ambient on standard FR-4 PCB |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rating, and 0.008 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Common Anode Node | Shared cathode return path for both Zeners; connects to system ground or low-side reference |
| Cathode A (Pin 2) | Zener A Cathode | First regulated output node; reverse-biased to generate 16.8–19.1 V reference |
| Cathode B (Pin 3) | Zener B Cathode | Second independent regulated output; enables dual-rail monitoring or redundancy |
Key Features
| Feature | Design Value |
|---|---|
| Dual Zener Matching | ΔVZ ≤ 5% between devices - enables accurate differential voltage detection without calibration |
| Automated Assembly Suitability | SOT23 footprint with JEDEC-standard pad layout - compatible with high-speed pick-and-place and reflow profiles |
| High-Reliability Qualification | AEC-Q101 qualified, HBM ESD 8 kV - suitable for automotive body electronics and industrial control modules |
| Green Compliance | Halogen- and antimony-free, RoHS 3 compliant (<900 ppm Br/Cl, <1000 ppm Sb) - meets global environmental directives |
Applications
| Power Supply Voltage Monitoring | Dual-Rail Overvoltage Protection |
|---|---|
|
Use Scenario: Monitoring 18 V DC input rail in industrial PLC power modules to trigger shutdown before downstream damage. IC Role / Device Role / Timing Role: Dual-Zener reference providing matched threshold detection for comparator inputs. Use Value: Enables single-component dual-threshold generation with ≤5% mismatch, reducing BOM count vs. discrete Zeners. |
Use Scenario: Clamping positive and negative rails in op-amp signal conditioning stages operating from ±15 V supplies. IC Role / Device Role / Timing Role: Common-anode configuration allows independent cathode connection to each rail for bidirectional clamping. Use Value: Eliminates need for two separate SOT23 packages, saving 1.5 mm² board area and improving thermal coupling consistency. |
| Automotive Body Control Unit Reference | Factory Automation Sensor Interface |
|
Use Scenario: Providing stable 18 V reference for microcontroller ADC in automotive door module under battery transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Zener pair buffers ADC reference against supply ripple and load dump spikes. Use Value: AEC-Q101 qualification ensures operation at 125°C junction temperature during engine bay thermal soak. |
Use Scenario: Calibrating 4–20 mA loop-powered sensors in factory floor IO modules exposed to EMI-rich environments. IC Role / Device Role / Timing Role: Dual Zener establishes precise upper/lower limit thresholds for fault detection logic. Use Value: Low 0.1 µA leakage prevents loading of high-impedance sensor outputs during idle state. |
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 |
|---|---|---|---|
| BZX84-C18LT1G | Single 18 V Zener in SOT23; no dual configuration or voltage matching | Requires two devices for dual-rail use; lacks matched ΔVZ specification | Select when only one regulated node is needed and board space permits duplication |
| DZ23C18-7-F | Common-cathode dual Zener (vs. AZ23's common-anode); same VZ range and power rating | Inverts circuit topology: cathodes tied, anodes used as outputs - suits different biasing schemes | Choose for designs requiring cathode-referenced clamping or legacy DZ23 footprint compatibility |
Compared with BZX84-C18LT1G and DZ23C18-7-F, AZ23C18-7 uniquely delivers matched dual-anode-referenced regulation in one SOT23, reducing component count and improving thermal tracking in multi-threshold detection systems.
Availability
AZ23C18-7 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive body control units, factory automation sensor interfaces, and DC-DC converter feedback networks requiring stable component supply and long-term lifecycle support.
Supply support for AZ23C18-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
AZ23C18-7 belongs to the AZ23 series of dual Zener diodes engineered for high-precision voltage referencing and matched-clamping applications in automotive, industrial, and consumer electronics where space-constrained SOT23 packaging and tight parametric matching are critical.
FAQ
What is the maximum continuous Zener current for AZ23C18-7 at 25°C ambient?
At 25°C ambient and with recommended FR-4 pad layout, the maximum continuous Zener current is 16.7 mA - derived from 300 mW / 18 V. Derating is required above 25°C per the 417 °C/W thermal resistance curve; at 85°C ambient, max current drops to ~10 mA to maintain 150°C junction limit.
Can AZ23C18-7 be used in place of a single Zener diode?
Yes - Pin 1 (common anode) and Pin 2 (cathode A) function as a standard 18 V Zener; Pin 3 remains unused. However, this wastes the matched dual capability and may increase cost versus single-Zener alternatives like BZX84-C18LT1G unless future design expansion requires the second cathode.
Is AZ23C18-7 qualified for automotive applications?
The commercial-grade AZ23C18-7 is not AEC-Q200 qualified, but Diodes offers automotive-grade variants (e.g., AZ23C18Q-7-F) with AEC-Q101 qualification, PPAP capability, and IATF 16949 manufacturing - these are required for safety-critical vehicle subsystems.
How does the +0.090 %/°C temperature coefficient affect accuracy over temperature?
Over the full –65°C to +150°C range, the coefficient introduces ±0.162 V drift from nominal 18 V (0.090 % × 18 V × 215°C span). At 125°C ambient (typical under hood), expected drift is +0.108 V - within most industrial reference tolerances but must be factored into high-accuracy ADC reference designs.
AZ23C18-7 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 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 FAQ
1.How can I place an order for AZ23C18-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ23C18-7 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 AZ23C18-7 reliable?
The price and inventory of AZ23C18-7 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 is usually 5 days.
3.What payment methods are accepted for AZ23C18-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ23C18-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ23C18-7?
AZ23C18-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ23C18-7 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 AZ23C18-7?
For technical support, including AZ23C18-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ23C18-7 requirements.
6.How does Aetrix verify that AZ23C18-7 is sourced from the original manufacturer or authorized distributors?
All AZ23C18-7 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 AZ23C18-7 meets industry standards.
7.What is the process for return or replacement of AZ23C18-7?
All AZ23C18-7 units undergo pre-shipment inspection (PSI). If there is an issue with AZ23C18-7, 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 AZ23C18-7 part is unused and in its original packaging.
Return procedure for AZ23C18-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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