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Diodes Incorporated BZT585B30TQ-7
- Part No.:
- BZT585B30TQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B30TQ-7.pdf
- Description:
- DIODE ZENER 30V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZT585B30TQ-7 from Diodes Incorporated is a precision Zener diode with 30 V nominal breakdown voltage (±2.0% tolerance), 350 mW power dissipation, and SOD523 package. It operates across –65 °C to +150 °C, features 80 Ω dynamic impedance at 2 mA test current, and delivers stable voltage reference in low-power analog circuits, automotive sensor signal conditioning, and industrial power supply feedback loops.
For engineers reviewing the BZT585B30TQ-7 datasheet, BZT585B30TQ-7 pinout, BZT585B30TQ-7 application, or BZT585B30TQ-7 equivalent, key selection criteria include Zener voltage accuracy, thermal stability (TC = +31.1 mV/°C), low reverse leakage (≤0.05 µA @ 21 V), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode uses silicon planar epitaxial construction to achieve tight 2.0% VZ tolerance and predictable temperature coefficient (+31.1 mV/°C). Its low-profile SOD523 package enables high-density PCB layouts while maintaining 357 °C/W junction-to-ambient thermal resistance under standard FR-4 mounting.
The device is characterized at IZT = 2 mA for 30 V rating, with Zener impedance measured at 1 kHz (80 Ω) and 100 Hz (300 Ω), supporting stable regulation in both DC bias and low-frequency ripple suppression applications. Reverse leakage remains ≤0.05 µA up to 21 V, ensuring minimal error in high-impedance reference nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30.0 V ±2.0% (29.4–30.6 V), enabling precise voltage clamping in 24 V system rails |
| Power Dissipation (PD) | 350 mW, supports continuous operation in compact SOD523 footprint without forced cooling |
| Zener Impedance (ZZT) | 80 Ω @ 2 mA, ensures minimal output voltage variation under load transients |
| Temperature Coefficient | +31.1 mV/°C @ 2 mA, allows predictable drift compensation in temperature-critical references |
| Reverse Leakage (IR) | ≤0.05 µA @ 21 V, prevents loading of high-impedance feedback networks |
| Capacitance (CT) | 50 pF @ 1 MHz, 0 V, suitable for low-noise analog signal path protection |
| Forward Voltage (VF) | 0.9 V @ 10 mA, enables use as low-drop clamp or polarity indicator in dual-function designs |
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 FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener mode | Enables bidirectional functionality: forward conduction (0.9 V clamp) or reverse breakdown (30 V regulation) |
| Cathode | Current exit terminal in forward bias; marked by cathode band; higher-potential node in Zener mode | Provides unambiguous polarity identification for automated optical inspection and pick-and-place alignment |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| ±2.0% VZ tolerance | Reduces need for post-assembly trimming in voltage reference circuits, lowering manufacturing cost |
| SOD523 package | 0.001 g weight and 1.25 mm × 0.85 mm footprint enable space-constrained designs like wearables and ECUs |
| Halogen- and antimony-free "Green" compound | Meets JESD22-A112 MSL Level 1 and RoHS 3 compliance without derating for moisture sensitivity |
| Low thermal resistance (357 °C/W) | Permits full 350 mW dissipation at ambient temperatures up to +85 °C with standard pad layout |
Applications
| Automotive Sensor Signal Conditioning | Industrial Power Supply Feedback |
|---|---|
|
Use Scenario: Stabilizing reference voltage for analog front-end circuits in wheel speed or pressure sensors operating in under-hood environments. IC Role / Device Role / Timing Role: Precision voltage clamp protecting ADC input stages from overvoltage transients while providing stable bias point. Use Value: Maintains <±0.6 V error over –40 °C to +125 °C due to tight VZ tolerance and known TC, improving sensor linearity. |
Use Scenario: Providing accurate feedback voltage to optocoupler-based isolated DC-DC converters in PLC power modules. IC Role / Device Role / Timing Role: Zener reference in secondary-side error amplifier circuit, setting regulated output voltage. Use Value: Enables ±1% output regulation accuracy with minimal drift across 10-year field life, supported by AEC-Q101 reliability data. |
| Portable Medical Device Battery Monitoring | IoT Node Voltage Supervision |
|
Use Scenario: Monitoring Li-ion battery pack voltage during charging cycles in handheld diagnostic tools. IC Role / Device Role / Timing Role: Overvoltage protection element clamping cell voltage at 30 V to prevent damage to fuel gauge ICs. Use Value: Limits peak transient energy with 350 mW rating and fast response, eliminating need for external TVS in Class II medical designs. |
Use Scenario: Enabling brown-out detection in battery-powered edge nodes using microcontroller internal ADC. IC Role / Device Role / Timing Role: Stable reference source for ADC measurement of system rail voltage against programmable threshold. Use Value: Delivers <0.05 µA leakage at 21 V, extending shelf life by >2 years compared to standard Zeners in always-on monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5261BT1G | 30 V nominal, ±5% tolerance, 500 mW PD, SOD-123 package (larger footprint) | Higher power handling but looser tolerance; requires larger PCB area and lacks AEC-Q101 certification | Select when cost sensitivity outweighs precision and automotive qualification requirements |
| BZX84-C30 | 30 V nominal, ±5% tolerance, 300 mW PD, SOT-23 package (3-pin, anode/cathode/anode) | Non-automotive grade, higher leakage (>1 µA), no thermal derating curve published | Acceptable for consumer-grade power supplies where long-term stability and PPAP support are not required |
Compared with MMSZ5261BT1G and BZX84-C30, BZT585B30TQ-7 offers tighter voltage tolerance, automotive qualification, and superior thermal performance in half the board area-critical for next-generation ECU and ADAS modules requiring high-reliability miniaturization.
Availability
BZT585B30TQ-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power supply feedback circuits, and portable medical device battery monitoring requiring stable component supply and full traceability.
Supply support for BZT585B30TQ-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 ISO/TS 16949-certified manufacturing facilities worldwide.
The BZT585 series belongs to Diodes' precision Zener portfolio designed specifically for AEC-Q101-compliant automotive voltage reference and protection applications, emphasizing tight tolerance, thermal stability, and green packaging.
FAQ
What is the maximum continuous Zener current for BZT585B30TQ-7 at 25°C?
The device is rated for 350 mW total power dissipation. At 30 V Zener voltage, this corresponds to a maximum continuous Zener current of 11.7 mA (350 mW ÷ 30 V). Derating is required above 25°C per the published power derating curve, reaching zero dissipation at 150°C ambient.
Is BZT585B30TQ-7 compatible with lead-free reflow soldering profiles?
Yes. The device 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 lead-free reflow profiles up to 260°C peak temperature with 60-second duration above 217°C.
How does the +31.1 mV/°C temperature coefficient affect circuit design?
This positive TC means VZ increases by 31.1 mV per degree Celsius rise in junction temperature. In precision references, it must be compensated via resistor networks or matched TC components; however, in overvoltage clamping, it provides predictable headroom expansion at elevated temperatures.
Can BZT585B30TQ-7 be used in place of a 24 V Zener diode for overvoltage protection?
No-it is specified for 30 V nominal breakdown. Substituting into a 24 V system risks insufficient clamping margin and potential downstream component damage. For 24 V systems, BZT585B24TQ (24 V ±2%) is the correct variant, sharing identical package, reliability, and thermal characteristics.
BZT585B30TQ-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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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
BZT585B30TQ-7 FAQ
1.How can I place an order for BZT585B30TQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B30TQ-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 BZT585B30TQ-7 reliable?
The price and inventory of BZT585B30TQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B30TQ-7 is usually 5 days.
3.What payment methods are accepted for BZT585B30TQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B30TQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B30TQ-7?
BZT585B30TQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B30TQ-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 BZT585B30TQ-7?
For technical support, including BZT585B30TQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B30TQ-7 requirements.
6.How does Aetrix verify that BZT585B30TQ-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B30TQ-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 BZT585B30TQ-7 meets industry standards.
7.What is the process for return or replacement of BZT585B30TQ-7?
All BZT585B30TQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B30TQ-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 BZT585B30TQ-7 part is unused and in its original packaging.
Return procedure for BZT585B30TQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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