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Diodes Incorporated BZT585B27T-7
- Part No.:
- BZT585B27T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B27T-7.pdf
- Description:
- DIODE ZENER 27V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:16,635
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Product details
Overview
BZT585B27T-7 from Diodes Incorporated is a precision 27 V Zener diode in SOD523 package, designed for voltage regulation and reference applications with ±2.0% tolerance, 80 Ω dynamic impedance at 2 mA, and 50 pF capacitance at 1 MHz. It delivers stable clamping in low-power analog circuits, ESD protection interfaces, and sensor biasing networks.
For engineers reviewing the BZT585B27T-7 datasheet, BZT585B27T-7 pinout, BZT585B27T-7 application, or BZT585B27T-7 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (357 °C/W), reverse leakage (<0.05 µA at 18.9 V), power dissipation (350 mW), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 27 V regulation point, specified at IZT = 2 mA. Its temperature coefficient of +25.4 mV/°C ensures predictable drift over temperature, and its low 50 pF junction capacitance supports high-frequency stability in filtering and reference paths.
The device uses an alloy-42 leadframe with matte tin annealing for solderability and meets J-STD-020 Level 1 moisture sensitivity. Its flat SOD523 package enables compact PCB layouts while maintaining 350 mW power handling under defined FR-4 pad conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 26.46–27.54 V range at 2 mA - enables tight voltage reference in 24 V system rails |
| Zener Impedance (ZZT) | 80 Ω at 2 mA - limits regulation error under load transients |
| Power Dissipation (PD) | 350 mW - defines maximum continuous clamping energy on standard FR-4 layout |
| Reverse Leakage (IR) | <0.05 µA at 18.9 V - ensures minimal quiescent current in battery-powered bias networks |
| Junction Capacitance (CT) | 50 pF at 1 MHz, 0 V - preserves signal integrity in RF-coupled reference or clamp circuits |
| Temperature Coefficient | +25.4 mV/°C at 2 mA - quantifies voltage drift per degree for thermal compensation design |
| Thermal Resistance (RθJA) | 357 °C/W - determines junction temperature rise above ambient under steady-state power |
Pinout & Package
Package: SOD523 - ultra-compact surface-mount plastic case (1.6 × 0.8 × 0.6 mm), cathode-banded, RoHS-compliant, halogen-free, weight ≈ 0.001 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; reverse-biased operation requires this terminal at lower voltage than cathode |
| Cathode | Zener breakdown terminal / regulation output node | Marked with band; supplies regulated 27 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Reduces calibration overhead in precision reference designs without trimming |
| AEC-Q101 qualification | Validates suitability for automotive infotainment and body control module voltage supervision |
| SOD523 low-profile package | Enables placement in space-constrained areas such as sensor modules and wearable PCBs |
| 350 mW power rating with 357 °C/W RθJA | Supports reliable operation up to +125°C ambient in sealed enclosures without forced cooling |
| Matte tin–annealed Alloy 42 leads | Ensures robust solder joint formation and long-term intermetallic stability per MIL-STD-202 |
Applications
| Automotive Sensor Biasing | Industrial Analog Signal Conditioning |
|---|---|
Use Scenario: Providing stable 27 V bias to MEMS pressure sensors in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source for sensor excitation circuitry. Use Value: Maintains sensor linearity across -40°C to +125°C due to AEC-Q101 qualification and controlled TC. | Use Scenario: Clamping ADC input protection in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Overvoltage shunt limiter for 24 V industrial fieldbus interfaces. Use Value: Limits transient-induced damage with <0.05 µA leakage, preserving measurement accuracy during idle states. |
| Portable Medical Instrument Reference | IoT Node Power Rail Supervision |
Use Scenario: Generating accurate reference for low-power ECG front-end amplifiers in handheld diagnostics. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing higher-current alternatives. Use Value: Delivers 27 V reference with 50 pF capacitance, minimizing noise coupling into high-gain analog stages. | Use Scenario: Monitoring 24 V backup rail integrity in battery-backed smart meter communication modules. IC Role / Device Role / Timing Role: Voltage supervisor element in discrete brown-out detection circuit. Use Value: Enables reliable trip-point setting with ±2.0% tolerance, reducing false resets in wide-temperature deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5254BT1G | 27 V nominal, ±5% tolerance, 350 mW, SOD-123 package (larger footprint) | Higher voltage tolerance increases calibration burden; larger package limits high-density layouts | Select when cost priority outweighs precision and board space constraints |
| BZX84-C27LT1G | 27 V nominal, ±5% tolerance, 300 mW, SOT-23 package (3-pin, cathode-anode-marked) | Lower power rating and wider tolerance reduce regulation stability in thermally demanding environments | Choose only for legacy SOT-23-compatible designs where SOD523 rework is impractical |
Compared with MMSZ5254BT1G and BZX84-C27LT1G, BZT585B27T-7 offers tighter voltage control (±2.0% vs. ±5%), smaller SOD523 footprint, and AEC-Q101 qualification-making it optimal for next-generation automotive and space-constrained industrial systems requiring repeatable 27 V regulation.
Availability
BZT585B27T-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog signal conditioning, and IoT node power rail supervision requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for BZT585B27T-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 and manufacturing operations across Asia and the Americas.
The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and regulation in automotive, industrial, and portable electronics where tight tolerance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for BZT585B27T-7?
The rated Zener voltage is 27 V nominal, with a guaranteed range of 26.46 V to 27.54 V at test current IZT = 2 mA. Breakdown begins within this band; operation below 26.46 V ensures non-conductive state with leakage <0.05 µA at 18.9 V.
Is BZT585B27T-7 suitable for use in automotive applications?
Yes - it is qualified to AEC-Q101 standards, features halogen- and antimony-free "Green" construction, and operates across -65°C to +150°C. Its ±2.0% voltage tolerance and thermal coefficient (+25.4 mV/°C) are validated for engine bay and cabin-mounted ECUs.
How does the SOD523 package affect thermal performance?
With RθJA = 357 °C/W on standard FR-4, the SOD523 achieves efficient heat transfer despite its small size. Derating begins above +25°C ambient, reaching ~250 mW at +85°C - sufficient for low-duty-cycle clamping and reference roles in sealed enclosures.
Can BZT585B27T-7 replace older Zener diodes like 1N4750A?
No - 1N4750A is a through-hole 27 V, 1 W device in DO-41 package. BZT585B27T-7 is surface-mount, lower-power (350 mW), and optimized for precision rather than surge handling. Direct replacement requires verifying layout, thermal path, and transient energy requirements.
BZT585B27T-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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 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
BZT585B27T-7 FAQ
1.How can I place an order for BZT585B27T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B27T-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 BZT585B27T-7 reliable?
The price and inventory of BZT585B27T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B27T-7 is usually 5 days.
3.What payment methods are accepted for BZT585B27T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B27T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B27T-7?
BZT585B27T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B27T-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 BZT585B27T-7?
For technical support, including BZT585B27T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B27T-7 requirements.
6.How does Aetrix verify that BZT585B27T-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B27T-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 BZT585B27T-7 meets industry standards.
7.What is the process for return or replacement of BZT585B27T-7?
All BZT585B27T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B27T-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 BZT585B27T-7 part is unused and in its original packaging.
Return procedure for BZT585B27T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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