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Diodes Incorporated BZT585B39T-7
- Part No.:
- BZT585B39T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B39T-7.pdf
- Description:
- DIODE ZENER 39V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
BZT585B39T-7 from Diodes Incorporated is a precision 39 V Zener diode in SOD523 package, ±2.0% voltage tolerance, 130 Ω dynamic impedance at 2 mA, -48.1 mV/°C temperature coefficient, and 45 pF capacitance at 1 MHz - used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZT585B39T-7 datasheet, BZT585B39T-7 pinout, BZT585B39T-7 application, or BZT585B39T-7 equivalent, key selection criteria include Zener voltage accuracy, thermal stability, low capacitance for signal integrity, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a reverse-biased voltage reference with tightly controlled breakdown at 39 V (38.22–39.78 V), specified at 2 mA test current. Its negative temperature coefficient (-48.1 mV/°C) enables predictable drift compensation in stable reference designs.
The SOD523 package supports high power density (350 mW rating) with low thermal resistance (357 °C/W) on FR-4 PCBs using Diodes' recommended pad layout. Cathode band marking defines polarity for unambiguous board-level orientation.
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 feedback loops |
| Zener Impedance (ZZT) | 130 Ω at IZT = 2 mA - limits output voltage variation under load transients |
| Temperature Coefficient | -48.1 mV/°C at IZT = 2 mA - enables predictable thermal drift modeling in precision references |
| Capacitance (CT) | 45 pF at f = 1 MHz, VR = 0 V - minimizes signal coupling in high-frequency bias networks |
| Max Reverse Current | 0.05 µA at VR = 27.3 V - ensures low leakage in high-impedance reference nodes |
| Power Dissipation | 350 mW at TA = 25°C - supports operation in compact, thermally constrained layouts |
| Package | SOD523 - 1.6 × 0.8 mm footprint with 0.3 mm height for space-constrained PCBs |
Pinout & Package
Two-terminal device in SOD523 package: anode and cathode marked by molded cathode band. No internal leads; terminals are flat, matte-tin-plated Alloy 42 leads solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node connection | Connected to system ground or lower-potential rail in shunt regulator topology |
| Cathode | Regulated output node | Provides stable 39 V reference when reverse-biased; marked by visible band on package |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Reduces need for post-assembly trimming in production calibration of analog sensor interfaces |
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control module voltage supervision |
| Halogen- and antimony-free "Green" construction | Meets IEC 61249-2-21 and JEDEC J-STD-70B for environmentally compliant manufacturing |
| Low-profile SOD523 package | Enables placement adjacent to ICs in dense power management subsystems without height interference |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for ADC biasing in door module microcontrollers monitoring window lift position and mirror actuation. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 39 V supply to op-amp gain stages and comparator thresholds. Use Value: Tight ±2.0% tolerance and AEC-Q101 qualification ensure consistent measurement accuracy across -40°C to +125°C operating range. | Use Scenario: Precision reference for 4–20 mA transmitter loop-powered pressure sensors in factory automation. IC Role / Device Role / Timing Role: Regulates loop supply voltage to maintain constant current source accuracy despite line voltage fluctuations. Use Value: Low 45 pF capacitance prevents high-frequency noise injection into analog front-end circuitry. |
| Medical Portable Infusion Pump | Consumer Smart Home Hub Power Supervision |
Use Scenario: Overvoltage clamp and reference for battery-charged microcontroller reset circuit in Class II medical devices. IC Role / Device Role / Timing Role: Provides fail-safe 39 V threshold for brown-out detection and safe shutdown sequencing. Use Value: -48.1 mV/°C TC allows accurate thermal derating of trip point over full operating temperature range. | Use Scenario: Voltage supervisor for USB-C PD input stage in smart speaker hubs with dual 5 V/9 V inputs. IC Role / Device Role / Timing Role: Clamps transient surges above 39 V while supplying stable reference to supervisor IC comparators. Use Value: 0.05 µA max reverse leakage at 27.3 V preserves standby current budget in always-on connectivity modules. |
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, SOD-123 package (2.7 × 1.6 mm) | Larger footprint; higher leakage (1 µA @ 31.2 V); not AEC-Q101 qualified | Select for cost-sensitive industrial boards where automotive qualification is unnecessary |
| BZX84-C39 | 39 V nominal, ±5% tolerance, 90 Ω ZZT, SOT-23 package (3.0 × 1.4 mm) | Higher profile (1.1 mm); no halogen-free certification; 10× higher reverse leakage (0.5 µA @ 31.2 V) | Select when higher power dissipation (350 mW vs. 300 mW) is required and RoHS/Green compliance is secondary |
Compared with MMSZ5267BT1G and BZX84-C39, BZT585B39T-7 delivers tighter voltage tolerance, lower leakage, AEC-Q101 qualification, and smaller SOD523 footprint - making it optimal for space-constrained, high-reliability automotive and portable medical designs.
Availability
BZT585B39T-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial 4–20 mA transmitters, and portable medical infusion pumps requiring stable component supply and long-term lifecycle continuity.
Supply support for BZT585B39T-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The BZT585 series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage reference and regulation in space-constrained, thermally demanding applications requiring AEC-Q101 qualification and green material compliance.
FAQ
What is the maximum power dissipation for BZT585B39T-7 at 85°C ambient?
At 85°C ambient temperature, the maximum power dissipation is 245 mW, calculated using the derating curve: 350 mW − [(85 − 25) × (350 mW / 125°C)] = 245 mW. This assumes mounting on FR-4 PCB with Diodes' recommended pad layout (AP02001).
Does BZT585B39T-7 support bidirectional ESD protection?
No - BZT585B39T-7 is a unidirectional Zener diode optimized for reverse-bias voltage regulation. It lacks symmetric clamping characteristics and is not rated for IEC 61000-4-2 ESD events. Use dedicated TVS diodes like D3V3M1U2LP for bidirectional ESD protection.
Can BZT585B39T-7 be used in series to achieve higher reference voltages?
Yes - two BZT585B39T-7 diodes in series yield ~78 V nominal reference, but total tolerance becomes ±2.8% (root-sum-square), and thermal tracking may degrade due to package separation. For >40 V references, consider single-device alternatives like BZT585B43T or precision voltage references such as REF5040.
Is the cathode band orientation consistent across all SOD523 Zeners from Diodes Incorporated?
Yes - Diodes Incorporated standardizes cathode band placement at the same end of the SOD523 package across its entire BZT585, MMBZ52, and MMSZ52 families. The band aligns with Pin 1 designation in IPC-7351B land pattern definitions and matches the top-view marking diagram in DS36638.
BZT585B39T-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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZT585B39T-7 FAQ
1.How can I place an order for BZT585B39T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B39T-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 BZT585B39T-7 reliable?
The price and inventory of BZT585B39T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B39T-7 is usually 5 days.
3.What payment methods are accepted for BZT585B39T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B39T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B39T-7?
BZT585B39T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B39T-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 BZT585B39T-7?
For technical support, including BZT585B39T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B39T-7 requirements.
6.How does Aetrix verify that BZT585B39T-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B39T-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 BZT585B39T-7 meets industry standards.
7.What is the process for return or replacement of BZT585B39T-7?
All BZT585B39T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B39T-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 BZT585B39T-7 part is unused and in its original packaging.
Return procedure for BZT585B39T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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