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Nexperia USA Inc. BZX58550-B43X
- Part No.:
- BZX58550-B43X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B43X.pdf
- Description:
- DIODE ZENER 43V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,089
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Product details
Overview
BZX58550-B43X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 43 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 375 Ω differential resistance at 2 mA - optimized for portable battery-powered sensors and IoT node power rails.
For engineers reviewing the BZX58550-B43X datasheet, BZX58550-B43X pinout, BZX58550-B43X application, or BZX58550-B43X equivalent, key selection criteria include its low 50 µA regulation test current, tight ±2 % tolerance, SOD523 footprint compatibility, and intentional leakage behavior for noise reduction per AN90031.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 42.1 V to 43.9 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and diode capacitance of 40 pF at 0 V. Its differential resistance is 375 Ω at 2 mA, confirming stable regulation under light-load conditions.
The device features two tolerance series (±2 % and ~±5 %), with the "B" suffix denoting the tighter tolerance grade. Its ultra-small SOD523 package enables high-density PCB layouts while maintaining thermal resistance of 350 K/W (junction-to-ambient, 35 mm² copper at cathode tab).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V (range 42.1 V to 43.9 V at IZ = 50 µA - defines precise reference point for low-bias circuits) |
| Tolerance | ±2 % (tighter "B" series grading ensures minimal voltage drift across production lots) |
| Test Current | 50 µA (enables stable regulation in micro-power applications such as coin-cell sensor nodes) |
| Differential Resistance | 375 Ω at IZ = 2 mA (low impedance maintains voltage stability against small load variations) |
| Total Power Dissipation | 300 mW (rated at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - sets safe continuous operating limit) |
| Forward Voltage | 0.9 V at IF = 10 mA (defines conduction threshold when used in polarity-sensitive protection or clamping) |
| Reverse Capacitance | 40 pF at f = 1 MHz, VR = 0 V (minimizes signal coupling in high-frequency reference paths) |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm, with flat leads and cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marked by bar on package - reverse-biased terminal during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail - completes bias path for controlled breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low test current operation | Specified at 50 µA - enables use in energy-harvesting and battery-life-critical systems without loading the source |
| Tight voltage tolerance | ±2 % (B-series) - reduces calibration overhead in precision analog front-ends and ADC reference circuits |
| Optimized leakage profile | Intentional minor rise in leakage current - suppresses switching noise and improves transient response in low-noise LDO pre-bias networks |
| Miniaturized SMD package | SOD523 footprint (1.2 × 0.8 mm) - supports high-density layout in wearables and compact sensor modules |
| Thermal performance | 350 K/W Rth(j-a) with 35 mm² cathode copper - sustains stable regulation under ambient temperature swings up to +150 °C |
Applications
| Portable Gas Sensor Biasing | IoT Node Reference Voltage |
|---|---|
Use Scenario: Providing stable bias voltage to electrochemical gas sensing elements powered by CR2032 batteries. IC Role / Device Role / Timing Role: Zener voltage reference diode regulating sensor excitation voltage at 43 V with minimal quiescent draw. Use Value: Enables >10-year battery life by drawing only 50 µA during active measurement cycles while holding voltage within ±0.86 V tolerance. |
Use Scenario: Generating a clean, low-drift reference for 12-bit SAR ADCs in NB-IoT endpoint devices. IC Role / Device Role / Timing Role: Precision shunt reference supplying 43 V to ADC reference divider network. Use Value: Delivers <±0.1 % full-scale error contribution due to ±2 % Zener tolerance and 40 pF low capacitance minimizing high-frequency coupling. |
| Low-Power PMIC Feedback | Industrial Temperature Transmitter |
Use Scenario: Setting feedback threshold in buck converter secondary-side regulation for ultra-low-quiescent PMICs. IC Role / Device Role / Timing Role: Shunt regulator defining output voltage setpoint via resistor divider connected to error amplifier input. Use Value: Maintains regulation accuracy over −40 °C to +85 °C with +0.05 mV/K tempco - eliminates need for external compensation. |
Use Scenario: Supplying excitation voltage to 4–20 mA loop-powered RTD transmitters in factory automation cabinets. IC Role / Device Role / Timing Role: Stable Zener reference establishing loop compliance voltage margin above 24 V supply rail. Use Value: Withstands 270 mW derated power at 70 °C ambient and exhibits <1 µA IR at 30 V - ensures reliable startup and fault-free loop operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C43 | ±5 % tolerance (vs. ±2 %), identical 43 V nominal, same SOD523 package | Acceptable where calibration is performed per unit; less suitable for uncalibrated multi-sensor arrays | Select when cost sensitivity outweighs absolute voltage accuracy requirements |
| BZX84-C43 | SOT-23 package (3.0 × 1.4 mm), ±5 % tolerance, 400 mW Ptot, higher rdiff (~500 Ω) | Requires larger board area; better suited for higher-current regulation (>5 mA) | Choose when higher power handling or legacy SOT-23 footprint compatibility is required |
Compared with BZX58550-C43, the BZX58550-B43X provides tighter voltage control critical for uncalibrated systems; versus BZX84-C43, it trades package size and power headroom for superior miniaturization and micro-power performance in space-constrained designs.
Availability
BZX58550-B43X is available at Aetrix Electronics and suitable for portable gas sensor biasing, IoT node reference voltage generation, and low-power PMIC feedback requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B43X 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
Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency and miniaturization.
The BZX58550 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for ultra-low-power voltage referencing in battery-operated and space-constrained electronics.
FAQ
What is the maximum continuous reverse power dissipation for BZX58550-B43X at 70 °C ambient?
At 70 °C ambient, the device's total power dissipation must be derated linearly from 300 mW at 25 °C using the thermal resistance value of 350 K/W. This yields a maximum continuous reverse power of approximately 165 mW - calculated as 300 mW × (1 − (70 − 25)/150), respecting the 150 °C max junction temperature limit.
Can BZX58550-B43X be used in series to achieve higher reference voltages?
Yes - multiple BZX58550-B43X diodes can be stacked in series to generate higher reference voltages (e.g., two units yield ~86 V). However, current matching becomes critical; mismatched leakage or rdiff may cause unequal voltage division. Use matched lots and verify thermal coupling in layout to ensure stability.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per AN90031, this controlled leakage improves dynamic response by reducing minority-carrier storage time, thereby suppressing switching noise and overshoot in fast-turning reference paths - particularly beneficial in PWM-controlled bias networks and low-noise LDO pre-regulators.
Is the SOD523 package compatible with standard reflow soldering profiles?
Yes - the SOD523 footprint matches JEDEC J-STD-020 moisture sensitivity level 1 requirements. Recommended reflow uses peak temperatures up to 260 °C for ≤30 seconds, with solder land dimensions per Figure 10 (0.5 mm pad width, 1.4 mm length, 2.15 mm center-to-center spacing) to ensure reliable wetting and mechanical strength.
BZX58550-B43X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B43X FAQ
1.How can I place an order for BZX58550-B43X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B43X 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 BZX58550-B43X reliable?
The price and inventory of BZX58550-B43X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B43X is usually 5 days.
3.What payment methods are accepted for BZX58550-B43X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B43X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B43X?
BZX58550-B43X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B43X 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 BZX58550-B43X?
For technical support, including BZX58550-B43X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B43X requirements.
6.How does Aetrix verify that BZX58550-B43X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B43X 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 BZX58550-B43X meets industry standards.
7.What is the process for return or replacement of BZX58550-B43X?
All BZX58550-B43X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B43X, 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 BZX58550-B43X part is unused and in its original packaging.
Return procedure for BZX58550-B43X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B43X Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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