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Diodes Incorporated BZT52C18TQ-7-F
- Part No.:
- BZT52C18TQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT52C18TQ-7-F.pdf
- Description:
- DIODE ZENER 18V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,958
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Product details
Overview
BZT52C18TQ-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal 18 V zener voltage (16.8–19.1 V range), 5 mA test current, 45 Ω maximum zener impedance at IZT, 300 mW power dissipation, and SOD523 package - used for precision voltage regulation and overvoltage protection in low-power automotive and industrial sensor signal conditioning circuits.
For engineers reviewing the BZT52C18TQ-7-F datasheet, BZT52C18TQ-7-F pinout, BZT52C18TQ-7-F application, or BZT52C18TQ-7-F equivalent, this page delivers verified electrical specs, thermal derating behavior, cathode-band polarity confirmation, JEDEC-qualified reliability data, and direct-fit alternatives for voltage reference and clamp design.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under controlled current conditions. Its 18 V nominal rating targets mid-range reference and clamping applications where tighter tolerance (±5.6% at 25°C) and low dynamic impedance (45 Ω @ 5 mA) are required over temperature.
The device features a flat-lead SOD523 package optimized for low profile (max height 0.65 mm) and high thermal efficiency (RθJA = 417 °C/W on FR-4), with cathode identification via molded band and matte tin annealed terminals compliant to MIL-STD-202 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V range at 5 mA - defines precise clamping threshold for 12–24 V system rails. |
| Power Dissipation (PD) | 300 mW - supports continuous regulation in space-constrained PCB layouts without forced cooling. |
| Zener Impedance (ZZT) | 45 Ω max @ 5 mA - ensures minimal output voltage variation under load transients in feedback networks. |
| Reverse Current (IR) | 0.1 µA max @ 16 V - guarantees negligible leakage in battery-backed or ultra-low-power monitoring circuits. |
| Thermal Resistance (RθJA) | 417 °C/W - enables operation up to +150°C ambient when mounted per JEDEC-standard FR-4 layout. |
| Operating Temperature | −55°C to +150°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
Package: SOD523 - ultra-small surface-mount plastic package (1.25 mm × 0.85 mm × 0.65 mm), cathode identified by molded band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path in shunt regulator topology. |
| Cathode | Reverse-breakdown terminal / Zener voltage output node | Connected to input rail or signal line being clamped; delivers stable 18 V reference when reverse-biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-qualified reliability | Qualified to AEC-Q101 standards for automotive-grade robustness and PPAP-capable manufacturing. |
| Green compound packaging | Molded plastic meeting UL 94V-0 flammability rating and <900 ppm Br/Cl, <1000 ppm Sb - compliant with RoHS 3 and automotive environmental mandates. |
| Low-profile thermal design | SOD523 footprint enables placement near heat-sensitive components while maintaining 300 mW dissipation capability on standard 2 oz copper. |
| Cathode band marking | Visible molded band ensures unambiguous polarity identification during automated optical inspection (AOI) and manual rework. |
Applications
| Automotive Sensor Signal Clamping | Industrial Analog Input Protection |
|---|---|
|
Use Scenario: Clamp transient spikes on 12 V CAN bus sensor lines exposed to load dump or ESD events. IC Role / Device Role / Timing Role: Shunt Zener element placed between signal line and ground to limit voltage excursion to ≤19.1 V. Use Value: Prevents damage to downstream op-amps or ADC inputs by diverting >100 mA surge currents while holding clamped voltage within ±5.6% of 18 V. |
Use Scenario: Protect 4–20 mA transmitter analog outputs from reverse polarity connection or wiring faults. IC Role / Device Role / Timing Role: Bidirectional clamp (with series diode) limiting reverse voltage to −18 V and forward overvoltage to +18 V. Use Value: Enables fault-tolerant field wiring without external fuse or TVS, leveraging 0.1 µA leakage at 16 V to avoid signal offset errors. |
| Portable Medical Device Reference | Smart Meter Voltage Monitoring |
|
Use Scenario: Provide stable 18 V reference for lithium-ion battery charge controller comparators in handheld diagnostics units. IC Role / Device Role / Timing Role: Precision Zener reference source feeding comparator hysteresis network. Use Value: Maintains ±0.5% regulation stability over −40°C to +85°C due to low tempco (12.6 mV/°C) and tight 16.8–19.1 V tolerance band. |
Use Scenario: Monitor AC mains-derived DC supply (e.g., 24 V auxiliary rail) for brownout detection in utility meters. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering microcontroller reset when rail drops below 16.8 V. Use Value: Eliminates need for dedicated supervisor IC by using 45 Ω dynamic impedance to ensure fast, repeatable trip point with <1 µs response to voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245BS-7-F | Same 18 V nominal rating but SOT-323 package (larger footprint, RθJA = 350 °C/W), 50 Ω ZZT, 200 mW PD | Higher power handling margin but requires 30% more board area; less suitable for ultra-dense automotive modules. | Select when thermal margin >300 mW is needed and SOT-323 pad layout is already established. |
| BZX84-C18LT1G | SOD-323 package, 18 V rating, 40 Ω ZZT, 300 mW PD, but only AEC-Q101 qualified in Q-suffix variants (e.g., BZX84C18LT1GQ) | Identical electrical performance but lacks standard automotive qualification unless ordered with Q suffix. | Choose only if sourcing non-automotive versions; otherwise require BZX84C18LT1GQ for PPAP-compliant programs. |
Compared with MMBZ5245BS-7-F and BZX84-C18LT1G, BZT52C18TQ-7-F delivers identical 18 V regulation with superior thermal efficiency in the smallest footprint (SOD523), full AEC-Q101 qualification out-of-box, and guaranteed 0.1 µA leakage at 16 V - making it optimal for space- and reliability-critical automotive sensor nodes.
Availability
BZT52C18TQ-7-F is available at Aetrix Electronics and suitable for automotive sensor clamping, industrial analog input protection, portable medical reference circuits, and smart meter voltage monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT52C18TQ-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 integrated circuits, specializing in high-reliability power management, signal integrity, and protection devices for automotive, industrial, and consumer markets.
The BZT52C series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and transient suppression in harsh-environment electronic control units (ECUs) and sensor interfaces.
FAQ
What is the cathode identification method for BZT52C18TQ-7-F?
The cathode is marked by a visible molded band on the top surface of the SOD523 package. This band aligns with the cathode terminal in the standardized SOD523 outline, and the device must be oriented so the band faces the higher-potential node in shunt regulator configurations. Terminal finish is matte tin annealed over Alloy 42, ensuring reliable solder joint formation per MIL-STD-202.
Does BZT52C18TQ-7-F meet AEC-Q101 requirements?
Yes - BZT52C18TQ-7-F is fully qualified to AEC-Q101 Rev. E for stress testing including HTGB, HTRB, TCT, and mechanical shock. It is manufactured in IATF 16949-certified facilities and supports PPAP documentation. The "Q" in the part number explicitly denotes automotive qualification, distinct from commercial-grade BZT52C18T-7-F variants.
How does thermal derating affect BZT52C18TQ-7-F's power handling above 25°C?
Per Figure 1 in DS30502 Rev. 18-2, power dissipation linearly derates from 300 mW at 25°C to zero at 150°C, yielding a slope of −2.5 mW/°C. At 100°C ambient, maximum allowable power drops to 112.5 mW. This assumes mounting on FR-4 with 2 oz copper and 1.92 mm² pad area - deviations require recalculating RθJA using measured thermal resistance.
Can BZT52C18TQ-7-F replace BZT52C18T-7-F in existing designs?
Yes - BZT52C18TQ-7-F shares identical electrical characteristics, SOD523 package dimensions, and pinout with BZT52C18T-7-F, differing only in automotive qualification status and traceability. No layout or schematic changes are needed; however, the Q-suffix version provides documented PPAP support, lot-level traceability, and extended temperature validation required for automotive production releases.
BZT52C18TQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- 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:
- SOD-523
BZT52C18TQ-7-F FAQ
1.How can I place an order for BZT52C18TQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C18TQ-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 BZT52C18TQ-7-F reliable?
The price and inventory of BZT52C18TQ-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 BZT52C18TQ-7-F is usually 5 days.
3.What payment methods are accepted for BZT52C18TQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C18TQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C18TQ-7-F?
BZT52C18TQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C18TQ-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 BZT52C18TQ-7-F?
For technical support, including BZT52C18TQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C18TQ-7-F requirements.
6.How does Aetrix verify that BZT52C18TQ-7-F is sourced from the original manufacturer or authorized distributors?
All BZT52C18TQ-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 BZT52C18TQ-7-F meets industry standards.
7.What is the process for return or replacement of BZT52C18TQ-7-F?
All BZT52C18TQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C18TQ-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 BZT52C18TQ-7-F part is unused and in its original packaging.
Return procedure for BZT52C18TQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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