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Diodes Incorporated BZT585B43TQ-7
- Part No.:
- BZT585B43TQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B43TQ-7.pdf
- Description:
- DIODE ZENER 43V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:7,399
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Product details
Overview
BZT585B43TQ from Diodes Incorporated is a precision Zener diode with 43 V nominal breakdown voltage (±2.0% tolerance), 350 mW power dissipation, and SOD523 package. It operates from −65 °C to +150 °C, features 150 Ω dynamic impedance at 2 mA test current, and is AEC-Q101 qualified for automotive voltage regulation and overvoltage protection circuits.
For engineers reviewing the BZT585B43TQ datasheet, BZT585B43TQ pinout, BZT585B43TQ application, or BZT585B43TQ equivalent, this device serves as a stable reference in low-power analog monitoring, ECU supply rail clamping, and sensor biasing where tight voltage tolerance and high-temperature reliability are required.
Technical Context
This Zener diode uses silicon planar construction to achieve precise reverse breakdown characteristics with minimal temperature drift (55.7 mV/°C typical TC). Its low capacitance (40 pF at 0 V) and fast response support noise-sensitive analog references and transient suppression in compact automotive modules.
The device is rated for continuous forward current up to 200 mA and reverse leakage ≤0.05 µA at 30.1 V, enabling dual-mode operation-forward conduction for polarity detection and controlled reverse breakdown for regulation-within a single 0.001 g SOD523 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, 42.14–43.86 V range at 2 mA - ensures ±2.0% regulation accuracy for 3.3 V/5 V/12 V system rail monitoring |
| Power Dissipation (PD) | 350 mW - supports stable operation on FR-4 PCB with minimum pad layout without forced cooling |
| Zener Impedance (ZZT) | 150 Ω at 2 mA - maintains low output impedance for reference stability under varying load conditions |
| Temperature Coefficient (TC) | +55.7 mV/°C - enables predictable voltage shift across −65 °C to +150 °C for automotive under-hood applications |
| Reverse Leakage (IR) | ≤0.05 µA at 30.1 V - minimizes standby current in battery-powered sensor nodes and always-on ECUs |
| Capacitance (CT) | 40 pF at 1 MHz, 0 V - preserves signal integrity in high-frequency feedback paths and ADC reference buffers |
Pinout & Package
Package: SOD523 - ultra-compact surface-mount plastic package (1.25 mm × 0.85 mm × 0.65 mm), flat lead design optimized for low profile and thermal performance on standard PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; enables reverse-biased regulation when cathode is biased higher |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; supplies regulated 43 V when reverse-biased above breakdown threshold; used as reference input for error amplifiers or comparator thresholds |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Reduces calibration overhead in factory-programmed automotive modules by eliminating post-solder trim requirements |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per IATF16949 manufacturing |
| SOD523 package with matte tin finish | Enables 0.65 mm height clearance in space-constrained ADAS camera modules and radar sensor PCBs |
| Halogen- and antimony-free "Green" construction | Meets EU RoHS 3 (2015/863/EU) and automotive OEM material declarations without compromising thermal resistance (357 °C/W) |
Applications
| Engine Control Unit (ECU) Power Monitoring | Automotive Camera Bias Reference |
|---|---|
|
Use Scenario: Monitoring 12 V battery rail voltage during cold cranking and load dump events. IC Role / Device Role / Timing Role: Zener reference for comparator input in supply supervisor IC. Use Value: 43 V breakdown provides 3.5× margin over nominal 12 V rail, ensuring reliable trip point detection even with ±10% tolerance and aging drift. |
Use Scenario: Providing stable bias voltage to CMOS image sensor analog front-end. IC Role / Device Role / Timing Role: Precision voltage reference for pixel reset and ADC reference buffer. Use Value: 40 pF capacitance and <0.05 µA leakage prevent signal coupling and dark current injection into sensitive imaging pixels. |
| Infotainment System Overvoltage Clamp | Body Control Module (BCM) Sensor Interface |
|
Use Scenario: Protecting USB-C PD controller inputs from transients on vehicle 5 V bus. IC Role / Device Role / Timing Role: Shunt clamp for fast-rising ESD and load-dump spikes. Use Value: 350 mW rating and 150 Ω ZZT allow clamping of 1 kV/1.2 µs pulses without thermal runaway or parameter shift. |
Use Scenario: Supplying regulated bias to Hall-effect position sensors in door latch assemblies. IC Role / Device Role / Timing Role: Low-drift reference for ratiometric sensor excitation. Use Value: +55.7 mV/°C TC matches typical sensor offset drift, minimizing net system error across −40 °C to +125 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ43T1G | 43 V nominal, ±5% tolerance, 500 mW PD, SOD-123 package (2.7 mm × 1.6 mm) | Larger footprint and looser tolerance reduce suitability for space-constrained automotive modules requiring tight calibration | Select when higher power handling is needed and board area permits larger package |
| BZX84-C43 | 43 V nominal, ±5% tolerance, 300 mW PD, SOT-23 package (3.0 mm × 1.4 mm) | Higher thermal resistance (450 °C/W) and wider voltage spread increase risk of drift in high-temp engine bay environments | Prefer only for non-automotive industrial use where AEC-Q101 compliance is not required |
Compared with MMSZ43T1G and BZX84-C43, the BZT585B43TQ delivers tighter voltage control, smaller size, and automotive-qualified reliability-making it optimal for next-generation ADAS and electrified powertrain systems where board space, thermal stability, and qualification rigor are critical.
Availability
BZT585B43TQ is available at Aetrix Electronics and suitable for automotive ECU power supervision, ADAS camera biasing, and BCM sensor interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZT585B43TQ 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 part of Diodes' precision Zener portfolio designed specifically for AEC-Q101-compliant voltage reference and overvoltage protection in automotive electronics, emphasizing tight tolerance, low leakage, and robust thermal performance.
FAQ
What is the maximum reverse voltage before breakdown for BZT585B43TQ?
The BZT585B43TQ has a nominal Zener voltage of 43 V with a guaranteed range of 42.14 V to 43.86 V at 2 mA test current. Breakdown begins within this range under reverse bias; operation above 43.86 V may cause excessive power dissipation unless current is strictly limited by external series resistance.
Is BZT585B43TQ suitable for use in high-temperature under-hood automotive applications?
Yes. The device is rated for operation from −65 °C to +150 °C ambient, AEC-Q101 qualified, and manufactured in IATF16949-certified facilities. Its +55.7 mV/°C temperature coefficient and 357 °C/W thermal resistance are characterized for stable performance in engine control and transmission modules.
How does the SOD523 package affect thermal performance compared to SOD-123 or SOT-23?
The SOD523 package achieves 357 °C/W junction-to-ambient thermal resistance on FR-4 with minimum recommended pads-lower than SOT-23 (≈450 °C/W) and comparable to scaled SOD-123 layouts. Its flat lead design improves heat spreading despite smaller footprint (1.25 mm × 0.85 mm vs. 2.7 mm × 1.6 mm).
Can BZT585B43TQ be used as a bidirectional ESD protection device?
No. It is a unidirectional Zener diode with cathode-band marking and specified only for reverse-bias regulation and forward conduction. For bidirectional ESD protection, dedicated TVS diodes such as D28V0L4BCP-7 or SP1003-01UTG are required.
BZT585B43TQ-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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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
BZT585B43TQ-7 FAQ
1.How can I place an order for BZT585B43TQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B43TQ-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 BZT585B43TQ-7 reliable?
The price and inventory of BZT585B43TQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B43TQ-7 is usually 5 days.
3.What payment methods are accepted for BZT585B43TQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B43TQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B43TQ-7?
BZT585B43TQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B43TQ-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 BZT585B43TQ-7?
For technical support, including BZT585B43TQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B43TQ-7 requirements.
6.How does Aetrix verify that BZT585B43TQ-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B43TQ-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 BZT585B43TQ-7 meets industry standards.
7.What is the process for return or replacement of BZT585B43TQ-7?
All BZT585B43TQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B43TQ-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 BZT585B43TQ-7 part is unused and in its original packaging.
Return procedure for BZT585B43TQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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