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Diodes Incorporated BZT585B18T-7
- Part No.:
- BZT585B18T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B18T-7.pdf
- Description:
- DIODE ZENER 18V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:37,974
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Product details
Overview
BZT585B18T-7 from Diodes Incorporated is a precision surface-mount Zener diode with nominal 18 V breakdown voltage (17.64–18.36 V at 5 mA), ±2.0% tolerance, 45 Ω dynamic impedance at 5 mA, and 80 pF capacitance at 1 MHz. It operates across –65 °C to +150 °C, dissipates up to 350 mW, and is AEC-Q101 qualified for automotive-grade reliability in voltage reference and overvoltage protection circuits.
For engineers reviewing the BZT585B18T-7 datasheet, BZT585B18T-7 pinout, BZT585B18T-7 application, or BZT585B18T-7 equivalent, key selection criteria include its tight Zener voltage tolerance, low thermal resistance (357 °C/W), SOD523 package footprint, cathode-band polarity marking, and suitability for space-constrained power rail clamping and analog reference stabilization.
Technical Context
This Zener diode functions as a two-terminal voltage regulator and clamp device, operating in reverse-biased breakdown mode with specified test current of 5 mA. Its temperature coefficient of +16.9 mV/°C indicates positive drift above 6 V, requiring compensation in precision references.
The SOD523 package enables high power density (350 mW) in a 1.6 × 0.8 mm outline, with matte tin-plated Alloy 42 leads ensuring solderability per MIL-STD-202. Moisture sensitivity Level 1 allows unlimited floor life without dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.0 V nominal, 17.64–18.36 V range at 5 mA - defines stable regulation point for 18 V rail supervision |
| Zener Impedance (ZZT) | 45 Ω at 5 mA - determines output voltage deviation under load current variation |
| Power Dissipation (PD) | 350 mW at 25 °C - sets maximum continuous clamping energy before thermal derating |
| Reverse Leakage (IR) | 0.05 µA at 12.6 V - ensures minimal quiescent current in high-impedance bias networks |
| Capacitance (CT) | 80 pF at 1 MHz, 0 V - limits high-frequency noise coupling in signal-path references |
| Temperature Coefficient | +16.9 mV/°C at 5 mA - quantifies voltage drift per degree Celsius above room temperature |
| Operating Temperature | –65 °C to +150 °C - supports under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: SOD523 - ultra-compact 1.6 × 0.8 mm surface-mount plastic case with flat lead profile, 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 ground | Connected to lower-potential node; reverse bias applied between cathode and anode to activate regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; supplies regulated 18 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Enables accurate 18 V threshold detection without post-production trimming |
| AEC-Q101 qualification | Validates reliability for automotive infotainment power management and body control modules |
| SOD523 package with 357 °C/W RθJA | Permits 350 mW operation on standard FR-4 PCBs using minimum pad layout per AP02001 |
| Halogen- and antimony-free "Green" construction | Meets IEC 61249-2-21 and JEDEC J-STD-709B environmental compliance requirements |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 12 V battery-derived supply against load-dump transients in telematics ECUs. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy above 18 V threshold. Use Value: Prevents downstream LDO and MCU damage by diverting >350 mW transient power within SOD523 thermal limits. |
Use Scenario: Providing stable 18 V reference for 16-bit ADC biasing in factory automation pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source with <±0.36 V total tolerance over temperature and production lot. Use Value: Enables <0.1% full-scale measurement accuracy without calibration due to tight 2% initial tolerance and low 80 pF noise coupling. |
| USB-C PD Overvoltage Protection | IoT Node Battery Monitor |
Use Scenario: Secondary overvoltage cutoff in USB-C power delivery negotiation circuits. IC Role / Device Role / Timing Role: Fast-acting clamp triggered at 18 V to disable upstream FET gate drive before system damage. Use Value: Responds within nanoseconds to 100 V/µs transients while maintaining <0.05 µA leakage to preserve standby current budget. |
Use Scenario: Monitoring Li-ion battery pack voltage via resistive divider with 18 V Zener reference. IC Role / Device Role / Timing Role: Low-power voltage reference enabling accurate state-of-charge estimation at 1.5 µA typical quiescent draw. Use Value: Extends 10-year IoT node battery life by limiting reference current to sub-µA levels while sustaining ±2% accuracy from –40 °C to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245BS-7-F | 18 V nominal, ±5% tolerance, 300 mW PD, SOT-323 package (2.1 × 1.3 mm) | Larger footprint; higher leakage (1 µA @ 14.4 V); no AEC-Q101 qualification | Select when cost priority outweighs automotive qualification and board space constraints |
| BZX84-C18LT1G | 18 V nominal, ±5% tolerance, 300 mW PD, SOT-23 package (3.0 × 1.4 mm) | 3× larger area; 10× higher capacitance (150 pF); unqualified for automotive | Choose only for legacy designs where SOT-23 compatibility is mandatory and thermal margin exists |
Compared with MMBZ5245BS-7-F and BZX84-C18LT1G, BZT585B18T-7 delivers tighter voltage tolerance, AEC-Q101 reliability, and superior power density in the smallest footprint-making it optimal for next-generation automotive and space-limited industrial sensors.
Availability
BZT585B18T-7 is available at Aetrix Electronics and suitable for automotive ECU power clamping, industrial sensor reference design, and IoT battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZT585B18T-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with operations spanning design, manufacturing, and distribution across Asia, Europe, and the Americas.
The BZT585 series belongs to Diodes' precision Zener portfolio engineered for high-reliability voltage reference and transient suppression in automotive and industrial systems where tight tolerance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for BZT585B18T-7?
The BZT585B18T-7 exhibits sharp Zener breakdown at 17.64 V minimum and 18.36 V maximum when tested at 5 mA. Below 12.6 V, reverse leakage remains ≤0.05 µA; sustained operation above 18.36 V risks thermal runaway unless current is strictly limited by external series resistance.
Can BZT585B18T-7 be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative temperature coefficients below 5 V and positive above 6 V, causing current hogging in parallel configurations. The BZT585B18T-7's +16.9 mV/°C coefficient means one device will dominate conduction, leading to thermal failure. Use a single unit with appropriate heatsinking or select higher-PD alternatives.
Is the SOD523 package compatible with standard reflow profiles?
Yes-the SOD523 package is rated for moisture sensitivity Level 1 and withstands IPC/JEDEC J-STD-020D-compliant reflow profiles, including peak temperatures up to 260 °C for 10 seconds. Diodes Incorporated specifies matte tin annealed leads that meet MIL-STD-202 Method 208 solderability requirements.
How does the 357 °C/W thermal resistance affect real-world PCB layout?
With 357 °C/W RθJA, a 350 mW dissipation raises junction temperature by 125 °C above ambient. To stay within the 150 °C max rating at 25 °C ambient, use Diodes' AP02001-recommended pad layout: 1.0 mm² copper pour per terminal, 0.3 mm trace width, and thermal vias to inner ground planes-reducing effective RθJA by ~30%.
BZT585B18T-7 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:
- ±2%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZT585B18T-7 FAQ
1.How can I place an order for BZT585B18T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B18T-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 BZT585B18T-7 reliable?
The price and inventory of BZT585B18T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B18T-7 is usually 5 days.
3.What payment methods are accepted for BZT585B18T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B18T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B18T-7?
BZT585B18T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B18T-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 BZT585B18T-7?
For technical support, including BZT585B18T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B18T-7 requirements.
6.How does Aetrix verify that BZT585B18T-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B18T-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 BZT585B18T-7 meets industry standards.
7.What is the process for return or replacement of BZT585B18T-7?
All BZT585B18T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B18T-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 BZT585B18T-7 part is unused and in its original packaging.
Return procedure for BZT585B18T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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