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Taiwan Semiconductor Corporation BZX585B43 RSG
- Part No.:
- BZX585B43 RSG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585B43 RSG.pdf
- Description:
- DIODE ZENER 43V 200MW SOD523F
- Quantity:
- Payment:
- Shipping:
Inventory:8,944
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Product details
Overview
BZX585B43 RSG from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 43 V, ±2% tolerance, 200 mW power dissipation, and SOD-523F package. It provides precise voltage regulation in low-power signal conditioning, reference, and protection circuits across consumer and industrial electronics.
For engineers reviewing the BZX585B43 RSG datasheet, BZX585B43 RSG pinout, BZX585B43 RSG application, or BZX585B43 RSG equivalent, key selection factors include its 43 V zener voltage at 2 mA test current, 353 Ω max zener impedance, 0.045 μA max reverse leakage at 10 V, and MSL1 moisture sensitivity rating for reflow compatibility.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 2% voltage tolerance and low dynamic impedance (≤353 Ω at IZT = 2 mA) support high-accuracy biasing and reference functions in analog front-ends and sensor interfaces.
Designed for surface-mount assembly, the device meets halogen-free (IEC 61249-2-21), RoHS, and WEEE requirements, with guaranteed solderability at 260°C/10s and operating junction temperature up to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal, 42.14–43.86 V range at 2 mA - enables precise 43 V reference or clamping |
| Power Dissipation | 200 mW - supports low-power regulation without heatsinking |
| Zener Impedance (ZZT) | ≤353 Ω at 2 mA - ensures minimal voltage shift under load variation |
| Reverse Leakage (IR) | ≤0.045 μA at 10 V - maintains high impedance in off-state for low quiescent current |
| Thermal Resistance (RθJA) | 680 °C/W - defines junction-to-ambient thermal path for ambient temperature derating |
| Moisture Sensitivity Level | MSL1 - allows unlimited floor life and standard reflow without baking |
| Operating Temperature | −65°C to +150°C - suitable for extended industrial and automotive under-hood environments |
Pinout & Package
Package: SOD-523F - ultra-small plastic surface-mount case (0.70–0.90 mm length, 1.50–1.70 mm width, 0.25–0.40 mm height), optimized for high-density PCB layouts and automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference ground | Connected to lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / voltage reference output | Provides regulated 43 V when reverse biased; marked with cathode band on package |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-production trimming in precision references |
| Halogen-free construction | Complies with IEC 61249-2-21 for environmentally constrained applications |
| High-temperature soldering guarantee | Rated for 260°C/10s reflow - eliminates pre-bake requirement for MSL1 handling |
| Green compound encapsulation | Meets RoHS Directive 2011/65/EU and WEEE 2002/96/EC compliance |
| Ultra-low leakage current | 0.045 μA max at 10 V supports battery-powered and ultra-low-power systems |
Applications
| Power Supply Rail Clamp | Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping transient overvoltage on 48 V DC input rails in industrial PLC modules. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector for downstream regulators and microcontrollers. Use Value: Limits rail voltage to ≤43 V during surge events, preventing damage to 3.3 V/5 V logic with no active control required. | Use Scenario: Providing stable 43 V bias for high-voltage op-amp feedback networks in current-sense amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference source for gain-setting resistors in isolated current measurement circuits. Use Value: Delivers <±0.85 V total error over temperature due to tight 2% tolerance and low TC, improving measurement linearity. |
| ADC Reference Stabilizer | Low-Power Microcontroller Reset Circuit |
Use Scenario: Stabilizing external reference voltage for 16-bit SAR ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, low-drift Zener reference replacing larger TO-92 devices in space-constrained designs. Use Value: Achieves <10 ppm/°C effective tempco via 43 V nominal point and low ZZT, reducing ADC INL drift. | Use Scenario: Generating reliable reset threshold for 32-bit ARM Cortex-M MCUs operating from unregulated 48 V supply rails. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering external reset IC when supply drops below 43 V × 0.9 = 38.7 V. Use Value: Enables deterministic brown-out detection with 0.045 μA leakage, extending battery life in always-on monitoring nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585C43 RSG | ±5% tolerance vs. BZX585B43 RSG's ±2%; otherwise identical SOD-523F package, 200 mW rating, and electrical specs | Acceptable where tighter voltage accuracy is not required, e.g., non-critical power rail clamping | Select BZX585B43 RSG for precision references; choose BZX585C43 RSG for cost-sensitive bulk protection |
| MMSZ43ET1G | Same 43 V nominal, ±5% tolerance, SOD-123 package (larger footprint), 500 mW rating, higher thermal resistance (500 °C/W) | Preferred for higher-power dissipation needs or legacy board designs with SOD-123 land patterns | Use MMSZ43ET1G only if layout cannot accommodate SOD-523F or >200 mW power is needed |
Compared with BZX585C43 RSG and MMSZ43ET1G, the BZX585B43 RSG delivers superior voltage accuracy (±2%) in the smallest available footprint (SOD-523F), making it optimal for high-density, precision-regulated analog signal paths where space and stability are critical.
Availability
BZX585B43 RSG is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable instrumentation, and automotive body-control modules requiring stable component supply and long-term manufacturability.
Supply support for BZX585B43 RSG 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, automotive, and consumer markets.
The BZX585B series belongs to TSC's Small Signal Product line, engineered for high-precision, low-power voltage regulation and protection in compact, thermally constrained applications.
FAQ
What is the zener voltage tolerance of BZX585B43 RSG?
The BZX585B43 RSG has a ±2% zener voltage tolerance, meaning its actual breakdown voltage falls between 42.14 V and 43.86 V when tested at 2 mA. This tight tolerance makes the BZX585B43 RSG suitable for applications demanding high voltage accuracy, such as precision reference circuits and calibrated sensor biasing networks.
What is the maximum power dissipation rating for BZX585B43 RSG?
The BZX585B43 RSG is rated for 200 mW maximum power dissipation at 25°C ambient temperature. Derating is required above 25°C per the published power vs. ambient temperature curve, with full derating to zero at +150°C junction temperature. This rating defines safe continuous operation in low-power regulation and clamping roles.
Is BZX585B43 RSG compatible with lead-free reflow soldering processes?
Yes, the BZX585B43 RSG is qualified for high-temperature lead-free reflow with guaranteed performance at 260°C for 10 seconds. Its MSL1 rating means it can be stored indefinitely before assembly without baking, simplifying manufacturing logistics and ensuring robust solder joint integrity in modern SMT lines.
What does the 'RSG' suffix indicate in BZX585B43 RSG?
The 'RSG' suffix in BZX585B43 RSG denotes green compound packaging (RoHS-compliant, halogen-free epoxy) and tape-and-reel packaging (7-inch reel, 8,000 units per reel). This distinguishes it from variants with different packaging or material specifications, and confirms full compliance with environmental directives including EU RoHS 2011/65/EU.
How does the zener impedance of BZX585B43 RSG affect circuit performance?
The BZX585B43 RSG has a maximum zener impedance of 353 Ω at 2 mA test current. Lower impedance improves regulation stability under varying load currents - for example, a 1 mA change in zener current causes ≤353 mV output shift. This behavior is critical in reference circuits where minimal voltage droop or ripple is required.
BZX585B43 RSG 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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523F
BZX585B43 RSG FAQ
1.How can I place an order for BZX585B43 RSG through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585B43 RSG 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 BZX585B43 RSG reliable?
The price and inventory of BZX585B43 RSG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585B43 RSG is usually 5 days.
3.What payment methods are accepted for BZX585B43 RSG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585B43 RSG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585B43 RSG?
BZX585B43 RSG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585B43 RSG 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 BZX585B43 RSG?
For technical support, including BZX585B43 RSG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585B43 RSG requirements.
6.How does Aetrix verify that BZX585B43 RSG is sourced from the original manufacturer or authorized distributors?
All BZX585B43 RSG 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 BZX585B43 RSG meets industry standards.
7.What is the process for return or replacement of BZX585B43 RSG?
All BZX585B43 RSG units undergo pre-shipment inspection (PSI). If there is an issue with BZX585B43 RSG, 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 BZX585B43 RSG part is unused and in its original packaging.
Return procedure for BZX585B43 RSG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585B43 RSG Tags
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