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Diodes Incorporated BZT585B43T-7
- Part No.:
- BZT585B43T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B43T-7.pdf
- Description:
- DIODE ZENER 43V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
BZT585B43T-7 from Diodes Incorporated is a precision surface-mount Zener diode with nominal 43 V breakdown voltage (±2.0% tolerance), 150 Ω maximum Zener impedance at 2 mA, and −55.7 mV/°C temperature coefficient. It delivers stable voltage reference in low-power analog circuits, power supply feedback loops, and overvoltage protection stages where tight regulation and thermal stability are required.
For engineers reviewing the BZT585B43T-7 datasheet, BZT585B43T-7 pinout, BZT585B43T-7 application, or BZT585B43T-7 equivalent, key selection criteria include its SOD523 package footprint, 350 mW power dissipation, 40 pF capacitance at 0 V, 0.05 µA reverse leakage at 30.1 V, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener operates in reverse-biased breakdown mode with a precisely controlled 43 V nominal Zener voltage at 2 mA test current. Its negative temperature coefficient (−55.7 mV/°C) enables predictable drift compensation in temperature-sensitive references.
The device uses a planar-diffused silicon junction in a molded plastic SOD523 case with matte tin-plated Alloy 42 leads. Cathode identification is marked by a band on the top surface, and it meets J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, 42.14–43.86 V range at IZT = 2 mA - ensures tight regulation in voltage reference designs |
| Power Dissipation (PD) | 350 mW at TA = 25°C - defines maximum continuous power handling on FR-4 PCB with recommended pad layout |
| Zener Impedance (ZZT) | 150 Ω max at IZT = 2 mA - limits AC ripple transmission in shunt regulator applications |
| Reverse Leakage (IR) | 0.05 µA max at VR = 30.1 V - guarantees minimal standby current in high-impedance sensing nodes |
| Capacitance (CT) | 40 pF at f = 1 MHz, VR = 0 V - constrains high-frequency noise coupling in signal-path references |
| Temperature Coefficient | −55.7 mV/°C at IZT = 2 mA - enables predictable thermal drift modeling for compensated designs |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - supports use as low-drop clamp or dual-mode (forward/reverse) protection element |
Pinout & Package
Package: SOD523 - ultra-compact, low-profile surface-mount case (1.6 × 0.8 × 0.6 mm) with flat leads optimized for thermal dissipation and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to ground or lower potential in Zener regulation | Provides low-VF conduction path; must be routed with adequate current-carrying trace width for 200 mA peak |
| Cathode | Negative terminal in forward bias; connected to regulated node in Zener operation | Marked by visible band; serves as reference output point - requires clean, low-noise PCB routing |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Enables single-supply reference accuracy without post-manufacturing trimming in cost-sensitive consumer and industrial systems |
| AEC-Q101 qualification | Validates robustness for automotive body electronics, infotainment power rails, and under-hood sensor interfaces |
| SOD523 package with 357 °C/W RθJA | Supports thermal management in space-constrained layouts while maintaining 350 mW rating on standard FR-4 |
| Halogen- and antimony-free "Green" construction | Meets IPC-1752A material declaration requirements and EU Directive 2011/65/EU (RoHS 2) compliance mandates |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail subject to load dump transients. IC Role / Device Role: Shunt overvoltage protector limiting rail excursion to ≤43.9 V during 12 V system surges. Use Value: Prevents damage to 5 V LDO regulators downstream by absorbing transient energy within 350 mW thermal limit. |
Use Scenario: Precision reference for 16-bit ADC in pressure transducer front-end. IC Role / Device Role: Stable 43 V Zener source feeding resistive divider to generate 2.5 V reference. Use Value: Delivers <±0.85% total error across −40°C to +125°C due to known TC and tight initial tolerance. |
| USB-C Power Delivery Feedback Loop | Smart Meter Voltage Monitoring |
|
Use Scenario: Secondary-side feedback voltage reference in isolated flyback converter for 20 V PD output. IC Role / Device Role: Zener-based optocoupler biasing node defining output regulation setpoint. Use Value: Maintains ±1.5% output accuracy over line/load/temperature with minimal component count. |
Use Scenario: High-voltage detection circuit monitoring 3-phase mains (230 V RMS) via resistive divider. IC Role / Device Role: Clamping diode protecting microcontroller ADC input from overvoltage faults. Use Value: Limits input to safe 43 V level with 0.05 µA leakage ensuring <1 µA total divider current error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ43ET1G | Same 43 V nominal Zener, but ±5% tolerance and 500 mW PD; SOD-123 package (larger footprint) | Higher power handling suits higher-current shunt regulation; looser tolerance limits use in precision references | Select when thermal margin >350 mW is needed and board area allows SOD-123; avoid where ±2% tolerance is mandatory |
| BZX84-C43 | 43 V Zener with ±5% tolerance, 300 mW PD, SOT-23 package; no AEC-Q101 qualification | Larger SOT-23 footprint and unqualified status restrict use to non-automotive commercial applications | Choose only for cost-sensitive, non-automotive designs where AEC-Q101 is not required and 300 mW suffices |
Compared with MMSZ43ET1G and BZX84-C43, BZT585B43T-7 provides tighter voltage tolerance and automotive qualification in the smallest SOD523 form factor - making it optimal for space-constrained, high-reliability applications demanding precise 43 V regulation.
Availability
BZT585B43T-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, USB-C power delivery feedback loops, and smart meter voltage monitoring requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT585B43T-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, manufacturing, and sales operations across Asia, Europe, and North America.
The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for high-stability voltage reference and overvoltage protection in automotive, industrial, and computing applications where tight tolerance and AEC-Q101 reliability are essential.
FAQ
What is the maximum continuous reverse current the BZT585B43T-7 can sustain without degradation?
The device is rated for continuous Zener current up to 2 mA at its specified test condition, but absolute maximum DC reverse current is limited by power dissipation: IZ(max) = PD/VZ ≈ 8.1 mA at 25°C ambient. Derating per Figure 1 applies above 25°C, and sustained operation beyond 2 mA requires thermal analysis of PCB layout and ambient conditions.
Does the BZT585B43T-7 support reflow soldering per JEDEC J-STD-020?
Yes - the SOD523 package is qualified to J-STD-020 Level 1, meaning it is rated for peak reflow temperatures up to 245°C with no floor life limitation. The matte tin finish ensures compatibility with lead-free SAC305 solder profiles and meets MIL-STD-202 Method 208 solderability requirements.
How does the −55.7 mV/°C temperature coefficient impact long-term reference stability?
This coefficient means the Zener voltage decreases by 55.7 mV per degree Celsius rise in junction temperature. Over a −40°C to +125°C range, that yields ~9.2 V total drift - but since VZ is 43 V, the relative drift is ~21.4%. Actual system-level drift depends on thermal resistance and power dissipation; proper derating keeps ΔTJ low to maintain <±0.5% total variation.
Can the BZT585B43T-7 be used in forward-bias applications such as ESD clamping?
No - its forward voltage is 0.9 V at 10 mA, but it is not characterized or rated for ESD pulse handling. The device lacks specified IPP, CJ, or clamping voltage under fast transients. For ESD protection, Diodes Incorporated recommends dedicated TVS devices like the D24M12P, which are tested to IEC 61000-4-2 Level 4.
BZT585B43T-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZT585B43T-7 FAQ
1.How can I place an order for BZT585B43T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B43T-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 BZT585B43T-7 reliable?
The price and inventory of BZT585B43T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B43T-7 is usually 5 days.
3.What payment methods are accepted for BZT585B43T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B43T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B43T-7?
BZT585B43T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B43T-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 BZT585B43T-7?
For technical support, including BZT585B43T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B43T-7 requirements.
6.How does Aetrix verify that BZT585B43T-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B43T-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 BZT585B43T-7 meets industry standards.
7.What is the process for return or replacement of BZT585B43T-7?
All BZT585B43T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B43T-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 BZT585B43T-7 part is unused and in its original packaging.
Return procedure for BZT585B43T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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