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Diodes Incorporated BZT52C18SQ-7-F
- Part No.:
- BZT52C18SQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZT52C18SQ-7-F.pdf
- Description:
- DIODE ZENER 18V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:800
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Product details
Overview
BZT52C18SQ-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 18 V zener voltage (16.8–19.1 V range at 5 mA), 200 mW power dissipation, 45 Ω maximum zener impedance at 5 mA, and SOD323 package. It provides precision voltage regulation in low-power biasing, reference, and overvoltage protection circuits for automotive and industrial control modules.
For engineers reviewing the BZT52C18SQ-7-F datasheet, BZT52C18SQ-7-F pinout, BZT52C18SQ-7-F application, or BZT52C18SQ-7-F equivalent, key selection criteria include zener voltage tolerance (±6%), temperature coefficient (+12.6 mV/°C), reverse leakage (<0.1 µA at 12.4 V), cathode-band polarity marking, and AEC-Q101 qualification for automotive reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying current loads. Its planar die construction ensures consistent breakdown characteristics, while the SOD323 package supports high-density PCB layouts and automated reflow assembly.
The device exhibits a positive temperature coefficient of +12.6 mV/°C above 6 V, enabling predictable drift compensation in reference designs. Its 200 mW power rating and 625 °C/W thermal resistance require careful thermal management on FR-4 boards using recommended pad layout per Diodes Inc. package outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V range at IZT = 5 mA - defines regulation setpoint tolerance |
| Power Dissipation (PD) | 200 mW - limits continuous operating current to ~11 mA at 18 V |
| Zener Impedance (ZZT) | 45 Ω max at 1 kHz, 5 mA - determines regulation stiffness under load transients |
| Reverse Leakage (IR) | <0.1 µA at VR = 12.4 V - ensures minimal quiescent current in standby bias networks |
| Temperature Coefficient | +12.6 mV/°C - quantifies voltage drift per degree rise above 25°C |
| Package | SOD323 - 1.3 × 1.7 mm footprint, 0.3 mm height, cathode band polarity marking |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SOD323 - ultra-small plastic surface-mount case with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, and cathode band marking on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation circuit; forms reference ground return path |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Marked by band; supplies regulated 18 V to load when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ distribution and repeatable breakdown behavior across production lots |
| AEC-Q101 qualification | Validates suitability for automotive body electronics, infotainment power rails, and sensor biasing |
| Lead-free & halogen-free | Meets RoHS 2 (2011/65/EU) and green compound requirements (<900 ppm Br/Cl, <1000 ppm Sb) |
| Moisture sensitivity Level 1 | Eliminates bake requirement prior to reflow; compatible with standard SMT assembly lines |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in engine coolant and exhaust gas sensors. IC Role / Device Role / Timing Role: Zener voltage reference source for analog front-end conditioning circuitry. Use Value: Maintains ±0.5% reference accuracy over -40°C to +125°C ambient due to AEC-Q101 thermal validation and low leakage. | Use Scenario: Generating precise 18 V reference for 16-bit DAC output buffers in programmable logic controller (PLC) analog outputs. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed rail for op-amp bias and DAC reference divider. Use Value: Delivers <0.1 µA leakage at 12.4 V, minimizing error contribution to 100 µA full-scale current loops. |
| USB-C Power Negotiation Clamp | Low-Power Microcontroller Reset Circuit |
Use Scenario: Clamping CC line voltage during USB-C PD communication to prevent exceedance of 5.5 V absolute maximum rating. IC Role / Device Role / Timing Role: Overvoltage protection shunt element on Type-C configuration channel. Use Value: Fast response to transient spikes with 45 Ω dynamic impedance, limiting clamp voltage excursion to <19.1 V. | Use Scenario: Holding microcontroller reset pin low until supply stabilizes in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Voltage supervisor element in RC-based reset timing network. Use Value: Enables reliable reset assertion with <0.1 µA leakage, extending shelf life of coin-cell powered devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5245B-TP (Micro Commercial) | Same 18 V nominal, but ±5% tolerance (17.1–18.9 V), 500 mW PD, SOD-123 package | Larger footprint; higher power enables higher current regulation but requires more board area | Select when higher power margin or legacy SOD-123 layout compatibility is required |
| BZX84-C18 (Nexperia) | 18 V nominal, ±5% tolerance, 300 mW PD, SOT-23 package, no AEC-Q101 qualification | Three-terminal SOT-23 offers same footprint as ICs but lacks automotive reliability validation | Select for cost-sensitive industrial applications where AEC-Q101 is not mandated |
Compared with MMSZ5245B-TP and BZX84-C18, BZT52C18SQ-7-F delivers tighter automotive-grade reliability in the smallest footprint (SOD323), making it optimal for space-constrained, safety-conscious designs where leakage, thermal stability, and qualification are critical.
Availability
BZT52C18SQ-7-F is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog outputs, and USB-C power negotiation circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52C18SQ-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 North America.
The BZT52C series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage before breakdown for BZT52C18SQ-7-F?
The device begins controlled reverse breakdown at a nominal 18 V, with guaranteed range of 16.8 V to 19.1 V at test current IZT = 5 mA. Below 12.4 V, reverse leakage remains below 0.1 µA - this is the practical non-breakdown threshold for biasing applications.
Is BZT52C18SQ-7-F suitable for use in high-humidity environments?
Yes - it is qualified to J-STD-020 moisture sensitivity Level 1, meaning it can be stored indefinitely at ≤30°C/85% RH without baking. The UL 94V-0 molded plastic case and annealed matte tin plating provide robust environmental protection for automotive under-hood and industrial field deployments.
How does the +12.6 mV/°C temperature coefficient affect circuit performance?
This positive coefficient means output voltage increases by 12.6 mV per °C rise above 25°C. In a 18 V reference, that's ~0.07% per °C drift - acceptable for non-critical biasing but requires compensation in precision references. It enables predictable trimming in temperature-compensated Zener networks.
Can BZT52C18SQ-7-F replace a 1N4746A in an existing design?
No - the 1N4746A is a through-hole 18 V, 1 W Zener in DO-41 package. BZT52C18SQ-7-F is surface-mount, 200 mW, and has different thermal derating and impedance. Direct replacement requires PCB redesign, power budget recalculation, and verification of transient response with 45 Ω ZZT.
BZT52C18SQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6.39%
- Power - Max:
- 200 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:
- SOD-323
BZT52C18SQ-7-F FAQ
1.How can I place an order for BZT52C18SQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C18SQ-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 BZT52C18SQ-7-F reliable?
The price and inventory of BZT52C18SQ-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 BZT52C18SQ-7-F is usually 5 days.
3.What payment methods are accepted for BZT52C18SQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C18SQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C18SQ-7-F?
BZT52C18SQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C18SQ-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 BZT52C18SQ-7-F?
For technical support, including BZT52C18SQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C18SQ-7-F requirements.
6.How does Aetrix verify that BZT52C18SQ-7-F is sourced from the original manufacturer or authorized distributors?
All BZT52C18SQ-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 BZT52C18SQ-7-F meets industry standards.
7.What is the process for return or replacement of BZT52C18SQ-7-F?
All BZT52C18SQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C18SQ-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 BZT52C18SQ-7-F part is unused and in its original packaging.
Return procedure for BZT52C18SQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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