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Taiwan Semiconductor Corporation BZX585B51
- Part No.:
- BZX585B51
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585B51.pdf
- Description:
- DIODE ZENER 51V 200MW SOD523F
- Quantity:
- Payment:
- Shipping:
Inventory:8,801
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Product details
Overview
BZX585B51 from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 51 V, ±2% tolerance, 200 mW power dissipation, and SOD-523F package. It regulates voltage in low-power biasing, reference, and overvoltage protection circuits for industrial sensors and portable instrumentation.
For engineers reviewing the BZX585B51 datasheet, BZX585B51 pinout, BZX585B51 application, or BZX585B51 equivalent, key selection criteria include its 51 V zener voltage at 2 mA test current, 376 Ω maximum zener impedance, 0.045 μA reverse leakage at 39.8 V, -5 mV/°C temperature coefficient, and MSL 1 moisture sensitivity rating.
Technical Context
The BZX585B51 operates as a precision voltage reference diode in reverse-biased mode, delivering stable 51 V regulation under DC conditions with 2 mA zener test current. Its thermal resistance (Junction-to-Ambient) is 680 °C/W, and maximum junction temperature is 150 °C.
Designed for high-reliability surface-mount applications, it features halogen-free epoxy, Pb-free/RoHS compliance, and withstands 260 °C soldering for 10 seconds. The device exhibits a negative temperature coefficient of -5 mV/°C, indicating decreasing zener voltage with rising temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, 49.98–52.02 V range at IZT = 2 mA - defines precise clamping level for overvoltage protection |
| Power Dissipation | 200 mW - limits continuous DC power handling in compact SOD-523F footprint |
| Zener Impedance | 376 Ω max at IZT = 2 mA - determines regulation stability under varying load current |
| Reverse Leakage Current | 0.045 μA max at VR = 39.8 V - ensures minimal quiescent current in standby bias networks |
| Temperature Coefficient | -5 mV/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Package | SOD-523F - 1.6 × 0.8 mm surface-mount outline with 0.25–0.40 mm height, MSL 1 rated |
| Thermal Resistance | 680 °C/W - indicates significant self-heating at full power; requires ambient derating above 25 °C |
Pinout & Package
SOD-523F is a two-terminal surface-mount package with cathode band marking. Dimensions: 1.6 mm length × 0.8 mm width × 0.325 mm typical height. Cathode terminal is marked by a visible band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used in reverse-bias regulation; establishes reference potential |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to supply rail being clamped; delivers stable 51 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight voltage reference accuracy without external trimming in precision analog circuits |
| Halogen-free construction | Meets IEC 61249-2-21 requirements for environmentally compliant PCB assembly |
| MSL 1 rating | Allows unlimited floor life and reflow without dry-packaging or baking preconditioning |
| 260 °C/10 s soldering endurance | Supports standard lead-free reflow profiles without parametric shift or mechanical damage |
| Green compound encapsulation | Confirms RoHS-compliant molding compound per EU Directive 2011/65/EU |
Applications
| Industrial Sensor Biasing | Portable Instrument Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed 51 V reference for op-amp biasing. Use Value: Maintains sensor linearity across -40 °C to +125 °C ambient via predictable -5 mV/°C drift compensation. |
Use Scenario: Supplying regulated voltage to ADC reference inputs in handheld multimeters. IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate 51 V scaling point for 16-bit analog front-end. Use Value: Achieves <0.05% full-scale error contribution due to ±2% initial tolerance and low 0.045 μA leakage. |
| Overvoltage Clamp Protection | Low-Power Logic-Level Shifter |
Use Scenario: Protecting microcontroller GPIO pins from transient surges on 48 V industrial bus lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 52.02 V peak during ESD or inductive kick events. Use Value: Absorbs up to 200 mW surge energy without degradation, leveraging 376 Ω dynamic impedance for controlled clamping slope. |
Use Scenario: Level-shifting between 3.3 V logic and 51 V analog subsystems in battery-powered test equipment. IC Role / Device Role / Timing Role: Bidirectional voltage translator using forward conduction (0.7 V drop) and reverse zener action (51 V clamp). Use Value: Eliminates need for active level-shifters by exploiting inherent dual-mode operation in single SOD-523F device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5257BS-7-F | 51 V nominal, ±5% tolerance, 200 mW, SOD-323 package, 1000 Ω max ZZT | Looser tolerance and higher impedance reduce reference accuracy but improve surge robustness | Select when cost sensitivity outweighs precision; verify PCB pad compatibility with SOD-323 vs. SOD-523F |
| BZX84-C51 | 51 V nominal, ±5% tolerance, 300 mW, SOT-23 package, 70 Ω max ZZT, MSL 1 | Higher power rating and lower impedance suit higher-current regulation but require larger footprint | Choose for >2 mA load currents or where thermal margin is critical; confirm layout change for SOT-23 pads |
Compared with BZX585B51, MMBZ5257BS-7-F trades precision for ruggedness in smaller volume, while BZX84-C51 offers superior regulation performance at the cost of board space - both require footprint adaptation and do not provide drop-in replacement capability.
Availability
BZX585B51 is available at Aetrix Electronics and suitable for industrial sensor biasing, portable instrument reference design, and overvoltage clamp protection requiring stable component supply and long-term lifecycle support.
Supply support for BZX585B51 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete devices, analog ICs, and power management solutions for industrial and consumer markets.
The BZX585B51 belongs to TSC's Small Signal Product family, engineered for high-precision, low-power voltage regulation in space-constrained surface-mount applications demanding reliability and environmental compliance.
FAQ
What is the zener voltage tolerance of BZX585B51?
The BZX585B51 has a ±2% zener voltage tolerance, meaning its actual breakdown voltage falls within 49.98 V to 52.02 V when tested at 2 mA zener current and 25 °C ambient temperature. This tight tolerance supports high-accuracy voltage reference designs without calibration. The BZX585B51 achieves this specification consistently across its qualified production lots and is verified per Taiwan Semiconductor's C1607 revision testing protocol.
Is BZX585B51 compatible with lead-free reflow soldering?
Yes, the BZX585B51 is qualified for lead-free reflow soldering at 260 °C for 10 seconds, meeting JEDEC J-STD-020 requirements. Its SOD-523F package and halogen-free epoxy ensure no parametric shift or delamination under standard Pb-free thermal profiles. The BZX585B51 maintains full electrical compliance after exposure, including zener voltage stability and leakage current integrity.
What is the maximum reverse leakage current for BZX585B51?
The BZX585B51 specifies a maximum reverse leakage current of 0.045 μA at 39.8 V reverse voltage and 25 °C. This ultra-low leakage minimizes power loss in high-impedance bias networks and preserves accuracy in precision reference applications. The BZX585B51 maintains this performance across its full operating temperature range, with leakage increasing predictably per datasheet curves.
Does BZX585B51 have a defined temperature coefficient?
Yes, the BZX585B51 has a nominal temperature coefficient of -5 mV/°C at 2 mA test current, indicating its zener voltage decreases by approximately 5 mV per degree Celsius rise in junction temperature. This value is measured and guaranteed per Taiwan Semiconductor's characterization methodology. The BZX585B51's negative coefficient enables predictable drift compensation in temperature-sensitive analog circuits.
What packaging format is used for BZX585B51?
The BZX585B51 is supplied on 7-inch reels containing 8,000 units per reel, with green compound encapsulation confirming RoHS and halogen-free compliance. Each reel is labeled with full part number BZX585B51 RSG and conforms to JEDEC standards for SOD-523F tape-and-reel handling. The BZX585B51's reel packaging ensures automated placement compatibility and moisture-safe storage per MSL 1 classification.
BZX585B51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523F
BZX585B51 FAQ
1.How can I place an order for BZX585B51 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585B51 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 BZX585B51 reliable?
The price and inventory of BZX585B51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585B51 is usually 5 days.
3.What payment methods are accepted for BZX585B51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585B51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585B51?
BZX585B51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585B51 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 BZX585B51?
For technical support, including BZX585B51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585B51 requirements.
6.How does Aetrix verify that BZX585B51 is sourced from the original manufacturer or authorized distributors?
All BZX585B51 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 BZX585B51 meets industry standards.
7.What is the process for return or replacement of BZX585B51?
All BZX585B51 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585B51, 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 BZX585B51 part is unused and in its original packaging.
Return procedure for BZX585B51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585B51 Tags
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