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Diodes Incorporated BZT585B27TQ-7
- Part No.:
- BZT585B27TQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B27TQ-7.pdf
- Description:
- DIODE ZENER 27V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZT585B27TQ from Diodes Incorporated is a precision Zener diode with 27 V nominal breakdown voltage (±2.0% tolerance), 80 Ω maximum Zener impedance at 2 mA, and −25.4 mV/°C temperature coefficient. Packaged in SOD523, it delivers stable voltage reference and overvoltage protection in space-constrained automotive power management circuits.
For engineers reviewing the BZT585B27TQ datasheet, BZT585B27TQ pinout, BZT585B27TQ application, or BZT585B27TQ equivalent, key selection criteria include Zener voltage accuracy, low thermal drift, AEC-Q101 qualification, SOD523 footprint compatibility, and 350 mW power dissipation capability under defined PCB layout conditions.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its precisely controlled Zener breakdown threshold. Its negative temperature coefficient (−25.4 mV/°C) enables predictable drift compensation in analog sensing and regulator feedback paths.
The SOD523 package supports high power density with 357 °C/W junction-to-ambient thermal resistance on FR-4 PCBs using minimum recommended pads. It maintains stable regulation across −65 °C to +150 °C operating range and meets AEC-Q101 stress testing for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 26.46–27.54 V range at 2 mA - ensures tight voltage reference stability for feedback loops |
| Zener Impedance (ZZT) | 80 Ω max at 2 mA - limits output voltage variation under load transients |
| Temperature Coefficient | −25.4 mV/°C at 2 mA - enables predictable drift modeling in wide-temperature environments |
| Power Dissipation (PD) | 350 mW at 25°C ambient - defines maximum continuous energy handling on standard FR-4 layout |
| Reverse Leakage (IR) | 0.05 µA max at 18.9 V - guarantees minimal quiescent current in standby-mode protection circuits |
| Capacitance (CT) | 50 pF max at 1 MHz, 0 V - preserves signal integrity in high-frequency voltage clamp applications |
| Forward Voltage (VF) | 0.9 V at 10 mA - supports reliable forward conduction for dual-direction clamping configurations |
Pinout & Package
Package: SOD523 - ultra-compact surface-mount plastic package with flat lead design, 0.001 g weight, and cathode band marking. Dimensions: D = 0.75–0.85 mm, E = 1.15–1.25 mm, He = 1.55–1.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse bias reference ground node | Connected to lower-potential side of regulated circuit; establishes reference point for Zener operation |
| Cathode | Forward current exit / Reverse bias voltage reference node | Marked by band; connected to higher-potential side; provides stable 27 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Enables single-supply voltage reference designs without post-production trimming |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics requiring change control and PPAP compliance |
| SOD523 low-profile package | Reduces board area by >40% vs. SOD-123 while maintaining 350 mW dissipation capability |
| Halogen- and antimony-free "Green" construction | Meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1 requirements for eco-compliant manufacturing |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Monitoring 24 V battery rail in engine control modules under cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp for microcontroller supply monitoring circuitry. Use Value: Maintains accurate 27 V threshold detection across −40 °C to +125 °C with <0.05 µA leakage, preventing false fault triggers. |
Use Scenario: Protecting 0–10 V analog input channels in programmable logic controllers from field-wiring transients. IC Role / Device Role / Timing Role: Precision shunt clamp limiting input voltage to 27 V before ADC front-end op-amp stage. Use Value: 80 Ω Zener impedance ensures ≤2.16 V deviation at 27 mA surge, preserving measurement linearity. |
| Medical Infusion Pump Voltage Reference | Telecom Base Station Bias Supply Stabilization |
Use Scenario: Providing stable reference for motor driver current-sense amplifier in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Low-drift Zener reference for closed-loop current regulation feedback path. Use Value: −25.4 mV/°C TC enables predictable offset correction over 0–40 °C operating range, meeting IEC 60601-1 accuracy requirements. |
Use Scenario: Stabilizing bias voltage for RF power amplifier stages in outdoor telecom base stations. IC Role / Device Role / Timing Role: Temperature-compensated voltage clamp protecting LDMOS gate drivers during RF burst events. Use Value: 50 pF capacitance minimizes RF coupling into bias network, preserving amplifier gain flatness up to 2.5 GHz. |
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, +30 mV/°C TC | Higher voltage tolerance and positive TC limit use in precision references; larger footprint | Select when cost sensitivity outweighs accuracy and thermal drift requirements |
| BZX84-C27 | 27 V nominal, ±5% tolerance, 300 mW, SOT-23 package, no AEC-Q101 qualification | Lacks automotive qualification and has higher ZZT (100 Ω); unsuitable for safety-critical systems | Acceptable for commercial-grade consumer electronics where AEC-Q101 is not mandated |
Compared with MMSZ5254BT1G and BZX84-C27, BZT585B27TQ offers tighter voltage tolerance, negative temperature coefficient for drift compensation, AEC-Q101 qualification, and SOD523 space savings-making it optimal for automotive and industrial precision voltage reference designs where reliability and miniaturization are critical.
Availability
BZT585B27TQ is available at Aetrix Electronics and suitable for automotive ECU power monitoring, industrial PLC analog input protection, medical infusion pump voltage reference, and telecom base station bias supply stabilization requiring stable component supply and full traceability.
Supply support for BZT585B27TQ 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 components for automotive, industrial, and computing markets.
The BZT585 series is designed specifically for precision voltage regulation and overvoltage protection in space-constrained, thermally demanding automotive and industrial applications, emphasizing AEC-Q101 compliance and tight parametric control.
FAQ
What is the maximum reverse current specification for BZT585B27TQ at its rated Zener voltage?
The maximum reverse current (IR) is 0.05 µA at 18.9 V, measured under specified test conditions per DS38426 Rev. 4–2. This ultra-low leakage ensures minimal power loss in always-on monitoring circuits and supports long battery life in portable automotive sensors.
Is BZT585B27TQ compatible with lead-free reflow soldering processes?
Yes - BZT585B27TQ uses matte tin annealed terminals over Alloy 42 leadframe and is fully RoHS 3 compliant. It meets JEDEC J-STD-020 moisture sensitivity Level 1 and is qualified for standard Pb-free reflow profiles up to 260 °C peak temperature.
How does the −25.4 mV/°C temperature coefficient affect circuit performance?
This negative coefficient means the Zener voltage decreases by 25.4 mV per degree Celsius rise. In feedback networks, it can offset positive drift from other components (e.g., op-amps), improving overall system temperature stability without external compensation circuitry.
Can BZT585B27TQ be used in bidirectional transient voltage suppression?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation. For bidirectional TVS, a dedicated TVS diode such as the D24M27P (27 V, 200 W, bi-directional) must be selected, as BZT585B27TQ lacks symmetrical clamping capability and surge rating.
BZT585B27TQ-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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZT585B27TQ-7 FAQ
1.How can I place an order for BZT585B27TQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B27TQ-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 BZT585B27TQ-7 reliable?
The price and inventory of BZT585B27TQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B27TQ-7 is usually 5 days.
3.What payment methods are accepted for BZT585B27TQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B27TQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B27TQ-7?
BZT585B27TQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B27TQ-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 BZT585B27TQ-7?
For technical support, including BZT585B27TQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B27TQ-7 requirements.
6.How does Aetrix verify that BZT585B27TQ-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B27TQ-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 BZT585B27TQ-7 meets industry standards.
7.What is the process for return or replacement of BZT585B27TQ-7?
All BZT585B27TQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B27TQ-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 BZT585B27TQ-7 part is unused and in its original packaging.
Return procedure for BZT585B27TQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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