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Diodes Incorporated BZT585B33T-7
- Part No.:
- BZT585B33T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT585B33T-7.pdf
- Description:
- DIODE ZENER 33V 350MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,600
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Product details
Overview
BZT585B33T-7 from Diodes Incorporated is a precision surface-mount Zener diode with nominal 33 V breakdown voltage (32.34–33.66 V at 2 mA), ±2.0% tolerance, 350 mW power dissipation, and 325 Ω maximum Zener impedance at 2 mA. It operates from –65 °C to +150 °C and is used for voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection in automotive body control modules.
For engineers reviewing the BZT585B33T-7 datasheet, BZT585B33T-7 pinout, BZT585B33T-7 application, or BZT585B33T-7 equivalent, key selection criteria include its tight voltage tolerance, SOD523 package thermal performance, low temperature coefficient (+36.7 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode provides stable reverse-biased voltage regulation with a specified test current of 2 mA and a maximum Zener impedance of 325 Ω at that condition. Its positive temperature coefficient (+36.7 mV/°C) ensures predictable drift behavior above 30 V, supporting accurate biasing in temperature-varying environments.
The device uses an alloy-42 leadframe with matte tin annealing for solderability and complies with AEC-Q101 stress testing for high-reliability automotive applications. Its SOD523 package delivers low profile (0.35 mm max height) and high power density (350 mW on FR-4 PCB with recommended pad layout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 32.34–33.66 V range at IZT = 2 mA - enables precise 33 V reference in feedback networks |
| Power Dissipation (PD) | 350 mW at TA = 25 °C - supports regulation in space-constrained, low-power designs without forced cooling |
| Zener Impedance (ZZT) | 325 Ω max at IZT = 2 mA - limits output voltage variation under load transients in reference circuits |
| Temperature Coefficient (TC) | +36.7 mV/°C at IZT = 2 mA - quantifies predictable upward drift with temperature, critical for thermal compensation design |
| Reverse Current (IR) | 0.05 µA max at VR = 23.1 V - ensures minimal leakage in high-impedance sensing or standby regulation paths |
| Package | SOD523 - 1.6 × 0.8 mm footprint, 0.35 mm height, compatible with standard 0201 pick-and-place and reflow profiles |
| Operating Temperature | –65 °C to +150 °C - validated for under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: SOD523 - ultra-compact, flat-lead surface-mount package with cathode band marking. Dimensions: 1.60 mm length × 0.80 mm width × 0.35 mm height. Molded green compound (UL 94V-0), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source; maintains stable 33 V relative to anode during reverse bias operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2.0% Zener voltage tolerance | Reduces need for post-production calibration in voltage reference designs, improving yield in automotive sensor modules |
| AEC-Q101 qualification | Validated for automotive electronics including BCMs and lighting control units requiring extended temperature and life-cycle reliability |
| SOD523 package thermal resistance | RθJA = 357 °C/W enables 350 mW dissipation on minimal PCB copper, supporting miniaturized power management |
| Halogen- and antimony-free "Green" construction | Meets JESD22-A112 and RoHS 2 (2011/65/EU); <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - supports eco-compliant manufacturing |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring battery voltage and door lock status. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 33 V rail for analog front-end biasing. Use Value: Tight ±2.0% tolerance and AEC-Q101 qualification ensure consistent measurement accuracy across –40 °C to +125 °C operating range. |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transducers in factory automation. IC Role / Device Role / Timing Role: Precision voltage clamp protecting op-amp input stages from transient overvoltage. Use Value: Low 0.05 µA reverse leakage at 23.1 V prevents loading of high-impedance sensor bridges. |
| USB-C Power Delivery Feedback | Medical Diagnostic Equipment Reference |
Use Scenario: Setting feedback threshold in secondary-side regulation ICs for 33 V auxiliary rails in USB PD adapters. IC Role / Device Role / Timing Role: Zener-based voltage divider element defining error amplifier setpoint. Use Value: 325 Ω Zener impedance minimizes regulation error under dynamic load steps up to 100 mA. |
Use Scenario: Providing stable bias for photodiode amplifiers in portable blood oximeters. IC Role / Device Role / Timing Role: Low-noise voltage reference source for analog signal chain DC offset correction. Use Value: +36.7 mV/°C TC allows predictable thermal drift modeling, enabling software-based compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5260BT1G | 33 V nominal, ±5% tolerance, 500 mW PD, SOD-123 package (2.7 × 1.4 mm) | Larger footprint and looser tolerance; higher power but less precision | Select when board space permits larger package and ±5% regulation accuracy is acceptable |
| BZX84-C33 | 33 V nominal, ±5% tolerance, 300 mW PD, SOT-23 package (3.0 × 1.4 mm) | Higher thermal resistance (RθJA ≈ 375 °C/W), no AEC-Q101 qualification | Choose for cost-sensitive consumer applications where automotive qualification is not required |
Compared with MMSZ5260BT1G and BZX84-C33, BZT585B33T-7 offers superior voltage precision (±2.0% vs. ±5%), smaller SOD523 footprint, and AEC-Q101 validation-making it optimal for space-constrained, high-reliability automotive and industrial voltage reference designs.
Availability
BZT585B33T-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, USB-C power delivery feedback circuits, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for BZT585B33T-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 integrated circuits, 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 regulation in automotive, industrial, and communications systems demanding tight tolerance and AEC-Q101 compliance.
FAQ
What is the maximum Zener test current for BZT585B33T-7?
The maximum Zener test current is 2 mA, as specified in the Electrical Characteristics table. This current defines the operating point for measuring nominal 33 V breakdown voltage and associated parameters including Zener impedance (325 Ω max) and temperature coefficient (+36.7 mV/°C). Operation beyond this current requires derating per the power derating curve.
Is BZT585B33T-7 suitable for use in automotive under-hood applications?
Yes - BZT585B33T-7 is qualified to AEC-Q101 standards and rated for operation from –65 °C to +150 °C. Its SOD523 package, green molding compound, and alloy-42 leadframe are validated for thermal cycling, humidity, and mechanical stress typical of engine compartment environments.
How does the +36.7 mV/°C temperature coefficient affect circuit performance?
The positive temperature coefficient means the Zener voltage increases by approximately 36.7 mV per degree Celsius rise in junction temperature. In precision reference designs, this drift must be modeled or compensated - for example, by pairing with a negative-TC component or using software correction based on temperature sensor readings.
Can BZT585B33T-7 replace BZX84-C33 in existing designs?
No direct replacement is recommended without redesign. While both regulate near 33 V, BZT585B33T-7 has tighter ±2.0% tolerance, lower leakage (0.05 µA vs. 0.1 µA), smaller SOD523 footprint, and AEC-Q101 qualification - differences that impact layout, thermal management, and qualification requirements in automotive or high-reliability applications.
BZT585B33T-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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 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
BZT585B33T-7 FAQ
1.How can I place an order for BZT585B33T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT585B33T-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 BZT585B33T-7 reliable?
The price and inventory of BZT585B33T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT585B33T-7 is usually 5 days.
3.What payment methods are accepted for BZT585B33T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT585B33T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT585B33T-7?
BZT585B33T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT585B33T-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 BZT585B33T-7?
For technical support, including BZT585B33T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT585B33T-7 requirements.
6.How does Aetrix verify that BZT585B33T-7 is sourced from the original manufacturer or authorized distributors?
All BZT585B33T-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 BZT585B33T-7 meets industry standards.
7.What is the process for return or replacement of BZT585B33T-7?
All BZT585B33T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT585B33T-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 BZT585B33T-7 part is unused and in its original packaging.
Return procedure for BZT585B33T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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