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Taiwan Semiconductor Corporation BZX585B20
- Part No.:
- BZX585B20
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585B20.pdf
- Description:
- DIODE ZENER 20V 200MW SOD523F
- Quantity:
- Payment:
- Shipping:
Inventory:8,934
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Product details
Overview
BZX585B20 from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 20 V ±2%, 200 mW power dissipation, 55 Ω maximum zener impedance at 5 mA test current, and SOD-523F package. It provides precision voltage regulation in low-power signal conditioning, reference, and protection circuits across consumer, industrial, and communications equipment.
For engineers reviewing the BZX585B20 datasheet, BZX585B20 pinout, BZX585B20 application, or BZX585B20 equivalent, key selection criteria include zener tolerance (±2%), thermal resistance (680 °C/W), reverse leakage (<0.045 µA at 14.4 V), temperature coefficient (+14.4 mV/°C), and MSL-1 handling capability for high-yield reflow assembly.
Technical Context
The BZX585B20 operates as a two-terminal voltage reference device, clamping reverse-biased voltage at 20 V with tight 2% initial tolerance and predictable temperature drift (+14.4 mV/°C). Its low 55 Ω dynamic impedance at 5 mA ensures stable regulation under small-signal load variations.
Designed for surface-mount applications, it features halogen-free epoxy, Pb-free terminations, and 260 °C/10 s soldering robustness. The SOD-523F package enables high-density PCB layouts while maintaining thermal performance up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, 19.6–20.4 V range at 5 mA - enables precise 20 V reference or clamp in analog sensing and supply monitoring |
| Power Dissipation (PD) | 200 mW - supports continuous operation in low-power bias networks without heatsinking |
| Zener Impedance (ZZT) | 55 Ω max at IZT = 5 mA - ensures minimal voltage deviation under dynamic load transients |
| Reverse Leakage (IR) | <0.045 µA at 14.4 V - preserves signal integrity in high-impedance reference nodes |
| Temperature Coefficient (TC) | +14.4 mV/°C - allows predictable drift compensation in temperature-stable references |
| Thermal Resistance (RθJA) | 680 °C/W - defines derating curve: full 200 mW only at TA ≤ 75 °C per Fig.3 |
| Package | SOD-523F - 0.7–0.9 mm length, 1.5–1.7 mm width, 0.25–0.4 mm height - compatible with 0201-class pick-and-place |
Pinout & Package
SOD-523F is a two-terminal surface-mount package with cathode marked by a band on one end. No internal die bonding or substrate connections beyond anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used in reverse-bias regulation; carries forward current during transient overvoltage events |
| Cathode | Zener breakdown terminal / Voltage reference output | Provides regulated 20 V potential relative to anode; marked with band; must be biased positive relative to anode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct use in 20 V reference designs without trimming or calibration |
| MSL-1 moisture sensitivity | Eliminates bake requirement before reflow, reducing manufacturing cost and cycle time |
| Halogen-free & RoHS-compliant | Meets IPC-1752A material declaration requirements for green electronics programs |
| 260 °C/10 s soldering guarantee | Supports standard lead-free reflow profiles without parametric shift or delamination |
| Low 1.36 mg mass | Minimizes mechanical stress on fine-pitch PCB traces during thermal cycling |
Applications
| Overvoltage Protection in Sensor Interfaces | 20 V Reference for ADC Bias Networks |
|---|---|
Use Scenario: Protecting 20 V-rated analog front-end inputs from ESD or supply rail overshoot in industrial sensors. IC Role / Device Role / Timing Role: Clamping element that conducts above 20.4 V to shunt excess energy to ground. Use Value: Limits input voltage excursion to within 2% of 20 V, preserving ADC input stage integrity without adding series resistance. | Use Scenario: Providing stable 20 V reference to bias op-amp gain stages feeding 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Precision voltage source with <0.045 µA leakage, minimizing reference divider error. Use Value: Maintains reference accuracy within ±0.2% over 0–70 °C due to known +14.4 mV/°C drift and low ZZT. |
| Low-Power Voltage Monitor Threshold | Signal-Level Clamp in RS-485 Receivers |
Use Scenario: Setting trip point for microcontroller-based brown-out detection at 20 V supply rails. IC Role / Device Role / Timing Role: Zener-fed voltage divider feeding comparator input; defines exact 20 V threshold. Use Value: Achieves ±0.4 V trip window (19.6–20.4 V) without external trimming components. | Use Scenario: Limiting receiver input common-mode range in isolated RS-485 nodes operating from 24 V supplies. IC Role / Device Role / Timing Role: Bidirectional clamp (with series diode) limiting differential swing to ±20 V. Use Value: Prevents receiver saturation during cable fault conditions while maintaining 55 Ω ZZT for fast recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B (ON Semiconductor) | 20 V ±5%, 350 mW, SOT-23 package, RθJA = 350 °C/W | Higher power rating but larger footprint; less precise tolerance | Select when higher surge energy handling is needed and board space permits SOT-23 |
| BZX384-B20 (Nexperia) | 20 V ±2%, 300 mW, SOD-323 package, RθJA = 500 °C/W, MSL-1 | Same tolerance and halogen-free spec, but 0.2 mm longer and 0.2 mm wider than SOD-523F | Select when slightly higher power margin is acceptable and existing SOD-323 footprint exists |
Compared with MMBZ5242B and BZX384-B20, the BZX585B20 offers the smallest footprint (SOD-523F), lowest thermal resistance per unit area, and identical ±2% tolerance-making it optimal for space-constrained, thermally sensitive 20 V reference designs where 200 mW suffices.
Availability
BZX585B20 is available at Aetrix Electronics and suitable for overvoltage protection, precision reference generation, low-power voltage monitoring, and signal-level clamping requiring stable component supply and consistent parametric performance across production lots.
Supply support for BZX585B20 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, automotive, and consumer markets since 1979.
The BZX585B20 belongs to TSC's Small Signal Product family, engineered specifically for high-precision, low-power voltage regulation and protection in compact, thermally constrained PCB environments.
FAQ
What is the zener voltage tolerance of the BZX585B20?
The BZX585B20 has a nominal zener voltage of 20 V with a guaranteed tolerance of ±2% (19.6 V to 20.4 V) at 5 mA test current and 25 °C ambient. This tight tolerance eliminates need for post-assembly calibration in 20 V reference applications and is confirmed in the Electrical Characteristics table of the C1607 datasheet revision.
Is the BZX585B20 suitable for lead-free reflow soldering?
Yes, the BZX585B20 is qualified for high-temperature lead-free reflow with guaranteed performance after exposure to 260 °C for 10 seconds. This is explicitly stated in the Features section and validated per J-STD-020 MSL-1 classification, making it compatible with standard Pb-free assembly processes without pre-baking.
What is the maximum reverse leakage current for the BZX585B20?
The BZX585B20 specifies a maximum reverse leakage current of 0.045 µA at 14.4 V (72% of nominal VZ). This ultra-low leakage is critical for high-impedance reference dividers and battery-powered sensor nodes where standby current must remain below 100 nA.
Does the BZX585B20 have a defined thermal resistance value?
Yes, the BZX585B20 has a junction-to-ambient thermal resistance (RθJA) of 680 °C/W, measured on standard JEDEC 2-layer test board. This value directly determines its power derating curve: full 200 mW rating applies only up to 75 °C ambient, per Figure 3 in the C1607 datasheet.
What packaging format is available for the BZX585B20?
The BZX585B20 is supplied in 7-inch reels containing 8,000 units per reel (packing code RSG). Tape-and-reel packaging complies with EIA-481-D standards and supports automated SMT placement at rates exceeding 25,000 CPH using standard 0201 feeders.
BZX585B20 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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523F
BZX585B20 FAQ
1.How can I place an order for BZX585B20 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585B20 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 BZX585B20 reliable?
The price and inventory of BZX585B20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585B20 is usually 5 days.
3.What payment methods are accepted for BZX585B20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585B20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585B20?
BZX585B20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585B20 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 BZX585B20?
For technical support, including BZX585B20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585B20 requirements.
6.How does Aetrix verify that BZX585B20 is sourced from the original manufacturer or authorized distributors?
All BZX585B20 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 BZX585B20 meets industry standards.
7.What is the process for return or replacement of BZX585B20?
All BZX585B20 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585B20, 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 BZX585B20 part is unused and in its original packaging.
Return procedure for BZX585B20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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