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Diodes Incorporated BZT52HC18WFQ-7
- Part No.:
- BZT52HC18WFQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52HC18WFQ-7.pdf
- Description:
- DIODE ZENER 18V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,431
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Product details
Overview
BZT52HC18WFQ-7 from Diodes Incorporated is an AEC-Q101-qualified surface-mount Zener diode with nominal 18 V zener voltage (16.8–19.1 V), 5 mA test current, 20 Ω dynamic impedance at 5 mA, and ±0.05 µA maximum reverse leakage at 12.6 V. It delivers 375 mW power dissipation on standard FR-4 PCB and is used for precision voltage regulation and overvoltage protection in automotive body control modules.
For engineers reviewing the BZT52HC18WFQ-7 datasheet, BZT52HC18WFQ-7 pinout, BZT52HC18WFQ-7 application, or BZT52HC18WFQ-7 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (330 °C/W on minimal pad), cathode-band polarity marking, and SOD123F package compatibility with automated placement systems.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to clamp voltage at a stable reference level. Its 12.4–16.0 mV/°C temperature coefficient ensures predictable drift across –65 °C to +150 °C operating range, and its 70 pF capacitance at 1 MHz supports low-noise regulation in signal-path protection circuits.
The device uses a matte tin–annealed copper alloy leadframe for solderability per MIL-STD-202, Method 208, and features a molded green plastic case rated UL 94V-0. Polarity is unambiguously indicated by a cathode band, and moisture sensitivity is Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8–19.1 V at 5 mA - defines clamping threshold for 12 V automotive rail protection |
| Zener Impedance (ZZT) | 20 Ω at 5 mA - ensures <±0.1 V output shift under 1 mA load variation |
| Power Dissipation (PD) | 375 mW on standard FR-4 pad - sets max continuous power without derating below 25 °C |
| Thermal Resistance (RθJA) | 330 °C/W - determines junction temperature rise under ambient conditions |
| Reverse Leakage (IR) | 0.05 µA at 12.6 V - enables ultra-low standby current in always-on monitoring circuits |
| Capacitance (CT) | 70 pF at 1 MHz, 0 V - limits high-frequency noise coupling in sensor interface rails |
| Operating Temperature | –65 °C to +150 °C - supports under-hood deployment in engine control units |
Pinout & Package
Package: SOD123F (Type B), flat-lead, low-profile surface-mount package with cathode-band polarity marking and 0.015 g mass. Molded green plastic case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to system ground or lower-potential rail during regulation |
| Cathode | Reverse-bias breakdown terminal / regulated output node | Connected to protected node; voltage clamped to VZ when exceeding threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| SOD123F package | Enables 0.81–1.15 mm height profile and compatibility with 0402–0603 reflow footprints |
| Green compound (halogen/antimony-free) | Meets <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies Tier 1 automotive material declarations |
| PPAP capability | Supports full Production Part Approval Process documentation for OEM production release |
| Cathode band marking | Unambiguous visual polarity identification for automated optical inspection (AOI) and manual assembly |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Rail Protection |
|---|---|
Use Scenario: Regulating 12 V supply to microcontroller I/O pins in door module electronics. IC Role / Device Role / Timing Role: Zener clamping element providing overvoltage immunity against load-dump transients. Use Value: 16.8–19.1 V VZ range ensures safe margin above nominal 12 V rail while rejecting >24 V spikes. | Use Scenario: Protecting USB-C PD controller logic inputs from 5 V rail overshoot during hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance (70 pF) shunt regulator maintaining signal integrity on high-speed data lines. Use Value: 0.05 µA leakage preserves sleep-mode current budget; SOD123F footprint fits tight board space near connector. |
| Engine Control Unit (ECU) Sensor Interface | ADAS Camera Module Bias Supply |
Use Scenario: Stabilizing reference voltage for analog front-end of oxygen sensor amplifier. IC Role / Device Role / Timing Role: Precision voltage reference with 12.4–16.0 mV/°C TC enabling accurate cold-start calibration. Use Value: –65 °C to +150 °C operation covers full engine bay thermal envelope without derating. | Use Scenario: Providing clean bias to image sensor analog supply in rear-view camera PCB. IC Role / Device Role / Timing Role: Low-noise shunt regulator filtering switching noise from DC-DC converter output. Use Value: 20 Ω ZZT minimizes voltage droop during transient load steps; green compound satisfies OEM RoHS compliance audits. |
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 VZ, but wider tolerance (16.2–19.8 V); 350 mW PD; SOD-123 package (not SOD123F) | Lacks AEC-Q101 qualification and PPAP support; not approved for automotive production | Select only for cost-sensitive industrial prototypes where automotive qualification is unnecessary |
| BZX84-C18 (Nexperia) | 18 V VZ (16.2–19.8 V), 250 mW PD, 600 Ω ZZT; SOT-23 package | Higher impedance degrades regulation accuracy; smaller package limits thermal performance | Acceptable for low-power consumer devices but unsuitable for automotive load-dump protection |
Compared with MMSZ5245B-TP and BZX84-C18, BZT52HC18WFQ-7 provides tighter VZ tolerance, lower ZZT, higher PD, and full automotive qualification-making it the sole choice for production BCM and ECU designs requiring AEC-Q101 compliance.
Availability
BZT52HC18WFQ-7 is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power rail protection, and engine control unit sensor interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52HC18WFQ-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The BZT52H series targets automotive-grade Zener regulation, designed specifically for AEC-Q101-compliant voltage reference and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage this Zener diode can withstand before breakdown?
The BZT52HC18WFQ-7 has a specified zener voltage range of 16.8 V to 19.1 V at 5 mA test current. Its guaranteed breakdown occurs within this range; operation below 12.6 V reverse bias yields ≤0.05 µA leakage. It is not rated for sustained reverse voltage beyond its VZ specification.
Is this part suitable for use in a high-reliability medical device?
No. While AEC-Q101 qualified for automotive use, BZT52HC18WFQ-7 is not certified for life-support applications. Diodes Incorporated explicitly prohibits use in life-support devices without CEO-level written approval, and the part lacks ISO 13485 or IEC 60601-1 compliance documentation.
Does the SOD123F package require special stencil or reflow profile considerations?
Yes. The SOD123F's flat-lead geometry and 0.80–1.35 mm lead width demand precise solder paste volume control. Diodes recommends a Type 4 or finer solder paste, 125 µm stencil aperture, and peak reflow temperature of 260 °C for 10 seconds-aligned with IPC-J-STD-020 Level 1 moisture sensitivity requirements.
How does the 330 °C/W thermal resistance impact real-world power handling?
At 25 °C ambient, the 375 mW rating assumes no additional thermal resistance. With 330 °C/W RθJA, a 100 mW dissipation raises junction temperature by 33 °C-so at 85 °C ambient, max safe continuous power drops to ~225 mW to stay within the +150 °C TJ limit.
BZT52HC18WFQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6.38%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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-123F
BZT52HC18WFQ-7 FAQ
1.How can I place an order for BZT52HC18WFQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52HC18WFQ-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 BZT52HC18WFQ-7 reliable?
The price and inventory of BZT52HC18WFQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52HC18WFQ-7 is usually 5 days.
3.What payment methods are accepted for BZT52HC18WFQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52HC18WFQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52HC18WFQ-7?
BZT52HC18WFQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52HC18WFQ-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 BZT52HC18WFQ-7?
For technical support, including BZT52HC18WFQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52HC18WFQ-7 requirements.
6.How does Aetrix verify that BZT52HC18WFQ-7 is sourced from the original manufacturer or authorized distributors?
All BZT52HC18WFQ-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 BZT52HC18WFQ-7 meets industry standards.
7.What is the process for return or replacement of BZT52HC18WFQ-7?
All BZT52HC18WFQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52HC18WFQ-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 BZT52HC18WFQ-7 part is unused and in its original packaging.
Return procedure for BZT52HC18WFQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52HC18WFQ-7 Tags
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