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Diodes Incorporated BZX84C18Q-13-F
- Part No.:
- BZX84C18Q-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C18Q-13-F.pdf
- Description:
- DIODE ZENER 18V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:9,990
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Product details
Overview
BZX84C18Q-13-F from Diodes Incorporated is a 18 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 5 mA test current and 45 Ω dynamic impedance at 5 mA, with ±5% voltage tolerance (16.8–19.1 V), designed for precision voltage regulation and overvoltage protection in automotive-grade power rails.
For engineers reviewing the BZX84C18Q-13-F datasheet, BZX84C18Q-13-F pinout, BZX84C18Q-13-F application, or BZX84C18Q-13-F equivalent, key selection criteria include Zener voltage stability across temperature (−3.5 mV/°C TC), low leakage (<0.1 µA @ 12.6 V), AEC-Q101 qualification, and SOT23-compatible automated assembly compatibility.
Technical Context
This Zener diode operates in reverse breakdown mode to clamp or regulate voltage at nominal 18 V with tight tolerance and predictable temperature coefficient. Its planar die construction ensures stable Zener characteristics under pulsed and DC conditions.
The device delivers 350 mW power dissipation when leads are held at ambient temperature, with thermal resistance of 357 °C/W junction-to-ambient, and supports operation from −65 °C to +150 °C - meeting automotive reliability requirements per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V range at 5 mA - enables precise rail clamping in 12 V and 24 V automotive systems. |
| Power Dissipation (PD) | 350 mW - sufficient for transient suppression and biasing without heatsinking in compact PCB layouts. |
| Zener Impedance (ZZT) | 45 Ω at 5 mA - ensures minimal voltage deviation under load variation in feedback or reference circuits. |
| Reverse Leakage (IR) | <0.1 µA @ 12.6 V - guarantees negligible standby current in battery-sensitive applications. |
| Temperature Coefficient | −3.5 mV/°C - provides predictable, linear drift for compensated reference designs. |
| Package | SOT23 - industry-standard 3-pin surface-mount footprint compatible with high-speed pick-and-place and reflow. |
Pinout & Package
Package: SOT23 - molded plastic case, UL 94V-0 rated, matte tin-plated Alloy 42 leadframe, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connected to lower-potential node during normal operation; referenced to ground or common return in shunt regulator topology. |
| 2 (Cathode) | Zener breakdown terminal | Connected to regulated node; clamps voltage when reverse-biased above 18 V threshold. |
| 3 (Anode) | Common anode connection | Internally tied to Pin 1; confirms dual-anode configuration typical of SOT23 Zener diodes (cathode on center pin). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity, and mechanical shock - suitable for under-hood ECUs. |
| Green, halogen-free construction | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - compliant with RoHS 3 and automotive environmental directives. |
| Low moisture sensitivity (MSL 1) | No floor life limitation before reflow - eliminates baking requirement and simplifies SMT line logistics. |
| Planar die technology | Ensures repeatable Zener voltage distribution and long-term parametric stability under thermal stress. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Reference |
|---|---|
Use Scenario: Protecting CAN transceiver supply lines against load dump transients in 12 V vehicle networks. IC Role / Device Role / Timing Role: Shunt clamping element placed between VCC and ground to limit voltage excursion to ≤19.1 V. Use Value: Prevents damage to downstream 24 V-tolerant receivers while maintaining <0.1 µA leakage during normal operation. |
Use Scenario: Providing stable 18 V reference for analog front-end amplifiers in industrial pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source in ratiometric measurement circuitry. Use Value: Enables ±0.5% full-scale accuracy over −40 °C to +125 °C due to matched TC and low ZZT. |
| Consumer USB-C PD Adapter Feedback | Medical Portable Device Battery Monitor |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for USB-C Power Delivery compliance. IC Role / Device Role / Timing Role: Zener-based optocoupler biasing network to regulate feedback loop voltage. Use Value: Maintains regulation within ±2% across 5–100 mA load range due to 45 Ω ZZT and 350 mW PD. |
Use Scenario: Overvoltage detection in lithium-ion battery pack monitoring ICs for portable diagnostic tools. IC Role / Device Role / Timing Role: Threshold detector triggering shutdown when cell stack exceeds safe voltage. Use Value: Responds within 100 ns to 18 V step input with <0.1 µA quiescent current - extends battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4702T1G | 18 V nominal, 500 mW PD, 50 Ω ZZT, non-AEC-Q101 | Lacks automotive qualification; higher power rating suits non-automotive industrial regulators | Select when higher surge energy handling is required and AEC-Q101 is not mandated. |
| BZX84-C18-7-F | Identical electrical specs, same SOT23 package, but 3,000-piece tape-and-reel vs. 10,000-piece (−13-F) | Same function; differs only in packaging quantity and standard (non-Q) vs. automotive (Q) marking | Choose −7-F for prototyping or low-volume production where smaller reels reduce inventory overhead. |
Compared with MMSZ4702T1G and BZX84-C18-7-F, BZX84C18Q-13-F uniquely combines AEC-Q101 qualification, 10,000-unit reel packaging, and automotive-grade traceability - making it optimal for Tier 1 automotive production programs requiring full compliance and supply chain continuity.
Availability
BZX84C18Q-13-F is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference design, and medical battery monitoring requiring stable component supply with full AEC-Q101 documentation and lot-level traceability.
Supply support for BZX84C18Q-13-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with emphasis on high-reliability, energy-efficient components for automotive, industrial, and consumer markets.
The BZX84 series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C18Q-13-F has a nominal Zener voltage of 18 V with a guaranteed range of 16.8 V to 19.1 V at 5 mA test current. It begins controlled reverse breakdown within this band and maintains regulation up to its 350 mW power limit - exceeding 19.1 V risks thermal runaway if current is not externally limited.
Is this part suitable for use in a 24 V automotive system?
Yes - the device's 18 V Zener voltage and −65 °C to +150 °C operating range make it appropriate for clamping 24 V rail transients, especially when paired with a series current-limiting resistor. Its AEC-Q101 qualification confirms suitability for under-hood environments including load dump and jump-start conditions.
How does the "Q" in the part number affect specifications?
The "Q" denotes automotive qualification per AEC-Q101, including additional stress testing (HTOL, TCT, HAST), lot-level PPAP documentation, and enhanced traceability. Electrical parameters remain identical to non-Q variants - only reliability validation and manufacturing controls differ.
Can this Zener be used in place of a 15 V or 20 V variant?
No - Zener voltage is process-defined and non-adjustable. Substituting BZX84C18Q-13-F for 15 V or 20 V devices will cause incorrect regulation or insufficient clamping. Always match nominal Zener voltage to circuit requirements; the BZX84C15 and BZX84C20 are distinct, validated parts with different die structures.
BZX84C18Q-13-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
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6.39%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C18Q-13-F FAQ
1.How can I place an order for BZX84C18Q-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C18Q-13-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 BZX84C18Q-13-F reliable?
The price and inventory of BZX84C18Q-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C18Q-13-F is usually 5 days.
3.What payment methods are accepted for BZX84C18Q-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C18Q-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C18Q-13-F?
BZX84C18Q-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C18Q-13-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 BZX84C18Q-13-F?
For technical support, including BZX84C18Q-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C18Q-13-F requirements.
6.How does Aetrix verify that BZX84C18Q-13-F is sourced from the original manufacturer or authorized distributors?
All BZX84C18Q-13-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 BZX84C18Q-13-F meets industry standards.
7.What is the process for return or replacement of BZX84C18Q-13-F?
All BZX84C18Q-13-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C18Q-13-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 BZX84C18Q-13-F part is unused and in its original packaging.
Return procedure for BZX84C18Q-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C18Q-13-F Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
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MMSZ5245BS-7-F
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BZT52C15S-7-F
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MM5Z5V1ST1G
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