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Diodes Incorporated BZT585B39TQ-7
- Part No.:
- BZT585B39TQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B39TQ-7.pdf
- Description:
- DIODE ZENER 39V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,467
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Product details
Overview
BZT585B39TQ from Diodes Incorporated is a precision Zener diode with 39 V nominal breakdown voltage (±2.0% tolerance), 2 mA test current, 130 Ω maximum Zener impedance at 1 kHz, -48.1 mV/°C temperature coefficient, and 45 pF capacitance at 1 MHz. It operates across -65°C to +150°C and delivers stable voltage reference in low-power analog monitoring circuits.
For engineers reviewing the BZT585B39TQ datasheet, BZT585B39TQ pinout, BZT585B39TQ application, or BZT585B39TQ equivalent, this AEC-Q101 qualified device supports automotive-grade voltage regulation, ESD-protected sensor biasing, and precision reference generation where tight Zener voltage tolerance and low thermal drift are critical.
Technical Context
This Zener diode uses silicon planar epitaxial construction to achieve precise reverse-breakdown characteristics with minimal hysteresis and low leakage. Its ±2.0% VZ tolerance and -48.1 mV/°C temperature coefficient enable predictable clamping behavior over wide ambient ranges.
The device is optimized for low-current regulation (IZK = 0.5 mA) and exhibits 45 pF junction capacitance at 0 V, supporting stable operation in high-frequency feedback paths and noise-sensitive reference nodes without parasitic coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, 38.22–39.78 V range at IZT = 2 mA - ensures tight regulation in 3.3 V/5 V system rail monitors. |
| Zener Impedance (ZZT) | 130 Ω max at 1 kHz - maintains stable output under dynamic load transients in feedback loops. |
| Temperature Coefficient (TC) | -48.1 mV/°C - enables predictable voltage shift for compensated reference designs in automotive under-hood environments. |
| Reverse Current (IR) | 0.05 µA max at VR = 27.3 V - minimizes standby power loss in battery-backed circuits. |
| Junction-to-Ambient RθJA | 357 °C/W on FR-4 PCB - defines thermal derating above 25°C ambient for reliable 350 mW power handling. |
| Capacitance (CT) | 45 pF at f = 1 MHz, VR = 0 V - limits high-frequency noise injection into adjacent analog signal paths. |
Pinout & Package
Package: SOD523 - ultra-compact surface-mount package (1.25 mm × 0.85 mm × 0.65 mm) with flat lead design for low profile and enhanced thermal dissipation on PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during forward bias; used for polarity identification via cathode band marking. |
| Cathode | Zener breakdown terminal | Connected to higher-potential node during regulation; marked by visible band; carries full Zener current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Enables direct replacement in 39 V reference designs without recalibration or resistor trimming. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and body electronics applications requiring change control and PPAP compliance. |
| SOD523 package with matte tin finish | Supports automated placement and reflow soldering while ensuring MIL-STD-202-compliant solderability and RoHS/Green compliance. |
| Low 0.001 g mass and 357 °C/W RθJA | Reduces mechanical stress in vibration-prone environments and allows use in space-constrained modules without forced cooling. |
Applications
| Automotive Cabin Sensors | Industrial PLC Input Protection |
|---|---|
Use Scenario: Voltage reference for MEMS pressure sensors in HVAC control modules operating at 125°C ambient. IC Role / Device Role / Timing Role: Precision Zener reference providing stable 39 V bias to op-amp front-end circuitry. Use Value: ±2.0% VZ tolerance and -48.1 mV/°C TC ensure <±3% total error over full temperature range without external compensation. |
Use Scenario: Overvoltage clamp on 24 V digital input channels exposed to inductive switching transients. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting FPGA I/O pins from >30 V surges. Use Value: 130 Ω ZZT and 0.05 µA IR prevent false triggering while maintaining low standby leakage in always-on inputs. |
| Medical Wearable Battery Monitor | Smart Meter Reference Circuit |
Use Scenario: High-accuracy cell voltage scaling in lithium-ion battery fuel gauges with 10-year field life. IC Role / Device Role / Timing Role: Stable Zener reference for ADC reference divider network. Use Value: 45 pF CT avoids sampling distortion; AEC-Q101 qualification confirms long-term parametric stability under thermal cycling. |
Use Scenario: Primary voltage reference for metrology-grade energy measurement ICs in Class 0.2 smart meters. IC Role / Device Role / Timing Role: Low-drift 39 V reference feeding precision DACs and calibration circuits. Use Value: -48.1 mV/°C TC enables software-based thermal correction using single-point calibration, reducing BOM cost vs. TCXO-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5267BT1G | 39 V nominal, ±5% tolerance, 150 Ω ZZT, no AEC-Q101 rating | General-purpose industrial use only; not qualified for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and tighter tolerance requirements. |
| BZX84-C39 | 39 V nominal, ±5% tolerance, SOT-23 package (larger footprint), 170 Ω ZZT | Higher thermal resistance (450 °C/W) limits power handling in compact layouts | Choose if existing SOT-23 footprint compatibility is required and 357 °C/W thermal performance is not critical. |
Compared with MMSZ5267BT1G and BZX84-C39, BZT585B39TQ provides superior voltage accuracy, lower thermal resistance, and automotive qualification-making it the preferred choice for safety-critical or space-constrained reference designs demanding long-term stability.
Availability
BZT585B39TQ is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial PLC input protection, medical wearable battery monitoring, and smart meter reference circuits requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZT585B39TQ 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 consumer markets.
The BZT585 series belongs to Diodes' precision Zener diode portfolio, engineered specifically for AEC-Q101-compliant voltage reference and overvoltage protection in harsh-environment electronics.
FAQ
What is the maximum power dissipation for BZT585B39TQ at 25°C ambient?
The BZT585B39TQ has a maximum power dissipation of 350 mW at TA = +25°C when mounted on an FR-4 PCB with the recommended pad layout. Derating begins linearly above 25°C per the published power derating curve, reaching zero dissipation at approximately 125°C ambient.
Is BZT585B39TQ compatible with lead-free reflow soldering processes?
Yes - BZT585B39TQ features matte tin annealed terminals over Alloy 42 leadframe and is fully RoHS compliant (2015/863/EU), halogen- and antimony-free, and rated for standard lead-free reflow profiles per J-STD-020 Level 1 moisture sensitivity.
How does the -48.1 mV/°C temperature coefficient affect circuit performance?
This negative temperature coefficient means the Zener voltage decreases by 48.1 mV per degree Celsius rise. In 39 V reference designs, it results in ~1.88 V total shift over a -40°C to +125°C range - requiring either thermal compensation or system-level calibration for sub-1% accuracy across temperature.
Can BZT585B39TQ be used as a substitute for BZX55C39 in existing designs?
No - BZX55C39 uses a DO-35 glass package with higher thermal resistance (~500 °C/W) and ±5% tolerance. BZT585B39TQ's SOD523 footprint, ±2.0% tolerance, and AEC-Q101 qualification require PCB layout and qualification updates; it is not a drop-in replacement.
BZT585B39TQ-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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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
BZT585B39TQ-7 FAQ
1.How can I place an order for BZT585B39TQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B39TQ-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 BZT585B39TQ-7 reliable?
The price and inventory of BZT585B39TQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B39TQ-7 is usually 5 days.
3.What payment methods are accepted for BZT585B39TQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B39TQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B39TQ-7?
BZT585B39TQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B39TQ-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 BZT585B39TQ-7?
For technical support, including BZT585B39TQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B39TQ-7 requirements.
6.How does Aetrix verify that BZT585B39TQ-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B39TQ-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 BZT585B39TQ-7 meets industry standards.
7.What is the process for return or replacement of BZT585B39TQ-7?
All BZT585B39TQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B39TQ-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 BZT585B39TQ-7 part is unused and in its original packaging.
Return procedure for BZT585B39TQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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