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Diodes Incorporated BZT52C18-7-F
- Part No.:
- BZT52C18-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C18-7-F.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:206,244
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Product details
Overview
BZT52C18-7-F from Diodes Incorporated is a surface-mount 18 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with ±5.5% zener voltage tolerance (16.8–19.1 V), 45 Ω maximum zener impedance at 5 mA, and 0.1 µA maximum reverse leakage at 12.4 V. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.
For engineers reviewing the BZT52C18-7-F datasheet, BZT52C18-7-F pinout, BZT52C18-7-F application, or BZT52C18-7-F equivalent, key selection criteria include zener voltage accuracy, thermal resistance (RθJA = 338 °C/W), cathode-band polarity marking, SOD123 footprint compatibility, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under controlled current conditions. Its planar die construction ensures consistent breakdown characteristics, while the matte tin–plated alloy 42 leadframe guarantees solderability per MIL-STD-202, Method 208.
The device exhibits a positive temperature coefficient of +12.6 mV/°C near 18 V, enabling predictable drift compensation in temperature-sensitive references. Its 1.0 mA test current (IZTC) and 5 mA nominal zener current (IZT) define operating points for stable regulation and low dynamic impedance performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V range at 5 mA - defines regulated output voltage window under standard bias |
| Power Dissipation (PD) | 370 mW at TA = +25°C - sets maximum continuous power on FR-4 PCB with 1-inch copper pad |
| Zener Impedance (ZZT) | 45 Ω max at IZT = 5 mA - determines AC regulation error under varying load currents |
| Reverse Leakage (IR) | 0.1 µA max at VR = 12.4 V - ensures minimal standby current in clamping or reference configurations |
| Thermal Resistance (RθJA) | 338 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for derating above +25°C |
| Temperature Coefficient | +12.6 mV/°C at 18 V - enables predictable voltage drift correction in compensated designs |
| Package | SOD123 - standardized 2-pin surface-mount outline with cathode band marking and 0.010 g mass |
Pinout & Package
SOD123 package: 2-terminal surface-mount plastic case with cathode band marking; dimensions: D = 1.40–1.70 mm, E = 2.55–2.85 mm, He = 3.55–3.85 mm, L = 0.25–0.40 mm; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; forms reference ground return path |
| Cathode (marked) | Zener breakdown terminal / voltage regulation node | Connected to higher-potential rail; maintains stable 18 V relative to anode when reverse-biased ≥12.4 V |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage distribution and long-term stability under thermal cycling |
| AEC-Q101 qualification | Validates reliability for automotive electronics including infotainment power rails and sensor biasing |
| Lead-free & RoHS-compliant plating | Matte tin finish over alloy 42 leadframe meets MIL-STD-202 solderability and environmental compliance |
| UL 94V-0 molded plastic case | Provides flame-retardant housing suitable for enclosed industrial control modules and power supplies |
| Level 1 moisture sensitivity | Eliminates bake requirements before reflow, supporting high-yield automated assembly without preconditioning |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Power Monitoring |
|---|---|
Use Scenario: Stabilizing reference voltage for analog front-end circuitry in pressure or temperature transducers operating from 24 V supply rails. IC Role / Device Role / Timing Role: Zener diode providing 18 V shunt reference to set ADC input scaling and op-amp bias points. Use Value: Maintains ±5.5% voltage accuracy across -65°C to +150°C, enabling reliable sensor calibration without external regulators. | Use Scenario: Clamping transient overvoltages on 12 V battery-sensed lines during load-dump events in BCM microcontroller power domains. IC Role / Device Role / Timing Role: Passive overvoltage protection element diverting surge current away from sensitive logic inputs. Use Value: Responds within nanoseconds to >18 V excursions, limiting voltage to 19.1 V peak while dissipating up to 370 mW continuously. |
| Consumer USB-C Power Delivery Adapter Feedback | Medical Portable Diagnostic Device Reference |
Use Scenario: Providing feedback voltage reference for secondary-side regulation in isolated flyback converters powering USB-C PD negotiation ICs. IC Role / Device Role / Timing Role: Precision shunt reference setting optocoupler LED current to regulate output voltage. Use Value: Delivers 18 V reference with <45 Ω dynamic impedance, minimizing output ripple and improving cross-regulation in multi-output adapters. | Use Scenario: Generating stable bias voltage for low-noise instrumentation amplifiers in handheld ECG or pulse oximeter signal chains. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA) voltage reference establishing common-mode level for differential analog stages. Use Value: Enables sub-microvolt input offset stability by eliminating drift-induced errors from reference variation in battery-powered operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245B-7-F | Zener voltage 18 V, but SOT-23 package (3-pin, smaller footprint); 350 mW PD at TA = +25°C; 50 Ω ZZT | Higher board density possible, but lower power handling and different thermal profile due to smaller pad area | Select when space-constrained PCB layout prioritizes footprint size over thermal margin |
| 1N4746A | Through-hole DO-41 package; 1 W PD; 18 V nominal; ±5% tolerance; 20 Ω ZZT; no AEC-Q101 qualification | Higher power capability and lower impedance, but incompatible with automated SMT assembly and automotive qualification requirements | Select for prototyping or non-automated production where manual assembly and higher power are acceptable |
Compared with MMBZ5245B-7-F and 1N4746A, BZT52C18-7-F uniquely balances SMT manufacturability, AEC-Q101 reliability, and 370 mW thermal capability in the industry-standard SOD123 outline-making it optimal for volume automotive and industrial applications requiring traceable, green-compliant components.
Availability
BZT52C18-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control module protection, and medical portable diagnostic reference circuits requiring stable component supply, full RoHS compliance, and AEC-Q101 qualification.
Supply support for BZT52C18-7-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, energy-efficient components for automotive, industrial, and consumer markets.
The BZT52C series belongs to Diodes' general-purpose Zener diode product line, engineered for medium-current voltage regulation and overvoltage protection in cost-sensitive, high-volume SMT applications with stringent environmental compliance requirements.
FAQ
What is the maximum reverse voltage (VR) at which BZT52C18-7-F guarantees ≤0.1 µA leakage?
The datasheet specifies 0.1 µA maximum reverse current (IR) at VR = 12.4 V. This value is measured under standard test conditions (TA = +25°C) and defines the voltage threshold below which leakage remains negligible in reference or clamping applications.
Can BZT52C18-7-F be used in place of a 15 V Zener diode in a voltage regulator circuit?
No - BZT52C18-7-F has a nominal zener voltage of 18 V (range 16.8–19.1 V), not 15 V. Substituting it would raise the regulated output by ~3 V, potentially damaging downstream components. Use BZT52C15-7-F for 15 V regulation.
Is the SOD123 package of BZT52C18-7-F compatible with standard pick-and-place equipment?
Yes - the SOD123 outline is JEDEC-standardized and supported by all major SMT assembly equipment. Its cathode band marking, 0.010 g weight, and Level 1 moisture sensitivity enable direct placement without baking or special tooling.
Does BZT52C18-7-F require heatsinking in typical 370 mW operation?
No - at 370 mW dissipation on a standard FR-4 PCB with 1-inch copper pad, junction temperature rise is calculated as 370 mW × 338 °C/W ≈ 125°C above ambient. With TJ,max = +150°C, this allows safe operation up to +25°C ambient without additional heatsinking.
BZT52C18-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6%
- Power - Max:
- 500 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:
- SOD-123
BZT52C18-7-F FAQ
1.How can I place an order for BZT52C18-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C18-7-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 BZT52C18-7-F reliable?
The price and inventory of BZT52C18-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C18-7-F is usually 5 days.
3.What payment methods are accepted for BZT52C18-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C18-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C18-7-F?
BZT52C18-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C18-7-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 BZT52C18-7-F?
For technical support, including BZT52C18-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C18-7-F requirements.
6.How does Aetrix verify that BZT52C18-7-F is sourced from the original manufacturer or authorized distributors?
All BZT52C18-7-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 BZT52C18-7-F meets industry standards.
7.What is the process for return or replacement of BZT52C18-7-F?
All BZT52C18-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C18-7-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 BZT52C18-7-F part is unused and in its original packaging.
Return procedure for BZT52C18-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52C18-7-F Tags
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