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Diodes Incorporated BZX84B18-7-F
- Part No.:
- BZX84B18-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B18-7-F.pdf
- Description:
- DIODE ZENER 18V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:25,207
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Product details
Overview
BZX84B18-7-F from Diodes Incorporated is a precision 18 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 45 Ω dynamic impedance at 5 mA test current and 0.1 µA maximum reverse leakage at 12.6 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84B18-7-F datasheet, BZX84B18-7-F pinout, BZX84B18-7-F application, or BZX84B18-7-F equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (357 °C/W), junction-to-ambient derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 18 V nominal zener voltage is specified at 5 mA test current (IZT), with 45 Ω zener impedance (ZZT) and 225 Ω knee impedance (ZZK) at 1 mA, ensuring predictable regulation performance in feedback and reference paths.
The device features a negative temperature coefficient of +12.4 mV/°C above 10 V, enabling predictable drift compensation in temperature-sensitive references. It is qualified to AEC-Q101 standards and housed in a halogen-free, RoHS-compliant SOT23 package with matte tin-plated terminals suitable for lead-free reflow soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 17.6–18.4 V range at 5 mA - defines precise regulation point for voltage reference circuits |
| Power Dissipation (PD) | 350 mW at TA = 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZT) | 45 Ω at IZT = 5 mA - determines output voltage stability under small-signal load variations |
| Reverse Leakage (IR) | 0.1 µA max at VR = 12.6 V - ensures minimal quiescent current draw in high-impedance bias networks |
| Temperature Coefficient | +12.4 mV/°C - quantifies voltage drift per degree Celsius above 10 V, critical for temp-compensated designs |
| Package | SOT23 - surface-mount footprint compatible with automated assembly and space-constrained PCB layouts |
| AEC-Q101 Qualified | Yes - confirms suitability for automotive electronics requiring extended temperature and reliability validation |
Pinout & Package
Package: SOT23 - three-terminal plastic surface-mount package with 0.915 mm body width, 2.40 mm length, and 0.40 mm thickness; terminals are matte tin-plated alloy 42 leads, polarity marked by cathode band on top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; required for proper biasing |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; voltage regulation occurs between this pin and anode |
| Collector / NC (Pin 3) | Internal die attach pad | Electrically connected to cathode in standard SOT23 Zener construction; serves as secondary cathode path |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-manufacture trimming in precision reference applications |
| AEC-Q101 qualification | Validates reliability for automotive infotainment, body control, and sensor interface modules |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) for global market access |
| 350 mW power rating with 357 °C/W RθJA | Supports operation up to +125°C ambient in compact layouts when mounted per recommended pad design |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
Use Scenario: Providing stable 18 V bias to pressure and temperature sensor ICs in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference for ADC input scaling and sensor excitation. Use Value: ±2% VZ tolerance and AEC-Q101 qualification ensure signal integrity and functional safety compliance over -40°C to +125°C. |
Use Scenario: Generating fixed reference voltage for 12-bit DAC output buffers in programmable logic controllers. IC Role / Device Role / Timing Role: Low-drift Zener shunt regulator in op-amp feedback loop. Use Value: 45 Ω ZZT and +12.4 mV/°C TC allow predictable error budgeting in closed-loop calibration routines. |
| USB-C Power Negotiation | IoT Node Voltage Clamp |
Use Scenario: Clamping CC line voltage during USB PD communication handshake in portable chargers. IC Role / Device Role / Timing Role: Overvoltage protection element limiting CC pin excursion to 18 V. Use Value: 0.1 µA IR at 12.6 V minimizes standby current impact on battery life in always-on negotiation states. |
Use Scenario: Protecting MCU GPIO pins from ESD-induced transients in wireless sensor nodes. IC Role / Device Role / Timing Role: Secondary clamping device after TVS, absorbing residual energy below 18 V. Use Value: SOT23 footprint enables placement adjacent to I/O pads; 350 mW rating handles repetitive low-energy surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4689-7-F | 18 V nominal, ±5% tolerance, 500 mW rating, 30 Ω ZZT at 5 mA | Higher power and looser tolerance; better for non-critical regulation, worse for precision references | Select when cost or power margin outweighs voltage accuracy requirements |
| BZX84-C18 | 18 V nominal, ±5% tolerance, 300 mW rating, no AEC-Q101 qualification | Standard industrial grade only; lacks automotive reliability validation and tighter tolerance | Acceptable for consumer-grade power supplies where qualification and precision are not mandated |
Compared with MMSZ4689-7-F and BZX84-C18, BZX84B18-7-F delivers superior voltage accuracy (±2% vs. ±5%), automotive qualification, and optimized thermal performance (357 °C/W) - making it the preferred choice for safety-aware and precision-critical designs.
Availability
BZX84B18-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference generation, and IoT node voltage clamping requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for BZX84B18-7-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 computing markets.
BZX84B series belongs to Diodes' precision Zener diode product line, engineered for tight-tolerance voltage regulation in space-constrained, thermally demanding applications requiring AEC-Q101 compliance.
FAQ
What is the maximum reverse voltage (VR) at which BZX84B18-7-F guarantees ≤0.1 µA leakage?
The datasheet specifies 0.1 µA maximum reverse current (IR) at VR = 12.6 V - this is the rated test voltage for leakage verification, not the absolute maximum reverse voltage. The device remains in non-breakdown region up to 12.6 V and enters controlled Zener conduction above that threshold.
Can BZX84B18-7-F be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated Zener or implement active regulation with a pass transistor instead.
Is the SOT23 package of BZX84B18-7-F compatible with standard reflow profiles for lead-free soldering?
Yes - its matte tin-plated terminals are qualified for JEDEC J-STD-020 moisture sensitivity level 1 and support peak reflow temperatures up to 260°C, matching IPC/JEDEC standard lead-free profiles without delamination or solder joint failure.
How does the +12.4 mV/°C temperature coefficient affect circuit design at elevated ambient temperatures?
At +100°C ambient, the 18 V Zener voltage increases by approximately 930 mV (75°C × 12.4 mV/°C), resulting in ~18.93 V output. Designers must account for this drift in feedback loops or pair with complementary TC components to achieve net-zero drift in precision references.
BZX84B18-7-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
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B18-7-F FAQ
1.How can I place an order for BZX84B18-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B18-7-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 BZX84B18-7-F reliable?
The price and inventory of BZX84B18-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B18-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B18-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B18-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B18-7-F?
BZX84B18-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B18-7-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 BZX84B18-7-F?
For technical support, including BZX84B18-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B18-7-F requirements.
6.How does Aetrix verify that BZX84B18-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B18-7-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 BZX84B18-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B18-7-F?
All BZX84B18-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B18-7-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 BZX84B18-7-F part is unused and in its original packaging.
Return procedure for BZX84B18-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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