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Nexperia USA Inc. BZX58550-B4V3X
- Part No.:
- BZX58550-B4V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B4V3X.pdf
- Description:
- DIODE ZENER 4.3V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:7,172
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Product details
Overview
BZX58550-B4V3X 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 4.3 V regulation at 50 µA test current, with ±2 % tolerance, 600 Ω typical differential resistance at 5 mA, and 4.0 µA max reverse leakage at 3.4 V. It is used in portable battery-powered sensor nodes requiring stable low-current reference.
For engineers reviewing the BZX58550-B4V3X datasheet, BZX58550-B4V3X pinout, BZX58550-B4V3X application, or BZX58550-B4V3X equivalent, key selection criteria include its 4.3 V nominal Zener voltage, 50 µA regulation test current, SOD523 footprint compatibility, thermal resistance of 350 K/W on 35 mm² copper, and intentional low-leakage design for noise-sensitive analog rails.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 4.3 V across its terminals under reverse-bias conditions when current exceeds the knee threshold. Its regulation is specified at 50 µA - significantly lower than standard Zeners - enabling use in microamp-level bias networks without loading sensitive sources.
The BZX58550-B4V3X belongs to the "B" tolerance series (±2 %), features a 0.9 V forward voltage at 10 mA, and exhibits a temperature coefficient of −2.7 mV/K. Its 150 pF capacitance at 0 V and 1 MHz supports stable operation in low-frequency reference paths without unintended filtering or phase shift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.21 V to 4.39 V at IZ = 50 µA - ensures tight 4.3 V reference in low-current bias chains |
| Tolerance | ±2 % - enables accurate voltage setting without post-calibration in portable instrumentation |
| Differential Resistance (rdiff) | 600 Ω max at IZ = 5 mA - limits output impedance drift under small load variations |
| Reverse Leakage (IR) | 4.0 µA max at VR = 3.4 V - minimizes quiescent current draw in battery-critical designs |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines anode-to-cathode drop during forward conduction or ESD protection |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on 35 mm² Cu - sets safe operating area for PCB layout with minimal copper |
| Package | SOD523 (SC-79), 1.2 mm × 0.8 mm × 0.6 mm - enables high-density placement in space-constrained wearables and IoT edge nodes |
Pinout & Package
SOD523 (SC-79) surface-mount plastic package with flat lead profile, 2-terminal configuration, and cathode marked by a visible band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated voltage node; marking bar identifies this terminal for correct orientation during placement |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms the reference return path for Zener current |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - allows stable reference generation in µA-scale bias networks without compromising accuracy |
| Ultra-small footprint | SOD523 package (1.2 × 0.8 mm) - reduces board area by >50 % vs. SOT23 Zeners, critical for miniaturized sensors |
| Controlled leakage performance | 4.0 µA max IR at 3.4 V - prevents excessive standby drain in coin-cell-powered devices |
| Thermal robustness | 150 °C max junction temperature - supports reliable operation in sealed enclosures with limited airflow |
| Low capacitance | 150 pF at 0 V, 1 MHz - avoids signal coupling or instability in high-impedance reference inputs |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensor bridges in Bluetooth LE wearables. IC Role / Device Role / Timing Role: Shunt Zener regulator establishing 4.3 V reference for bridge bias, operating continuously at 25 µA. Use Value: Enables <1 µA additional system quiescent current while maintaining ±0.5 % full-scale accuracy over −20 °C to +70 °C. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADC in energy-harvesting environmental monitor. IC Role / Device Role / Timing Role: Low-noise voltage reference source for ADC VREF input, decoupled with 100 nF ceramic capacitor. Use Value: Delivers <20 µVpp low-frequency noise and <0.1 % line regulation, preserving effective resolution at sub-100 µA supply currents. |
| RTC Backup Regulation | Microcontroller Reset Threshold |
Use Scenario: Regulating backup voltage for real-time clock (RTC) circuitry powered by supercapacitor during main power loss. IC Role / Device Role / Timing Role: Precision shunt regulator clamping backup rail at 4.3 V to prevent RTC brownout below 3.0 V. Use Value: Draws only 0.8 µA at 3.8 V, extending supercapacitor hold-up time by 37 % compared to 5.1 V Zener alternatives. |
Use Scenario: Setting precise reset threshold for ultra-low-power ARM Cortex-M0+ MCU in smart meter design. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding comparator input to trigger reset at 4.3 V ±2 %. Use Value: Guarantees deterministic reset assertion across voltage ramp rates from 10 mV/s to 10 V/s, eliminating false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C4V3 | ±5 % tolerance (vs. ±2 %), identical VZ range and SOD523 package | Acceptable where cost sensitivity outweighs precision; higher leakage (5.0 µA) at same VR | Select when ±5 % regulation error is acceptable and BOM cost reduction is prioritized over reference stability |
| MMSZ4V3T1G | Same 4.3 V nominal, ±5 % tolerance, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot | Larger footprint and higher power rating - suitable for higher-current bias but incompatible with ultra-dense layouts | Choose only if board space permits larger package and thermal margin above 300 mW is required |
Compared with BZX58550-C4V3 and MMSZ4V3T1G, the BZX58550-B4V3X uniquely combines ±2 % tolerance, SOD523 size, and 50 µA regulation point - making it the sole option for space-constrained, high-accuracy, ultra-low-quiescent applications such as medical patch sensors and NB-IoT endpoint references.
Availability
BZX58550-B4V3X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, RTC backup regulation, and microcontroller reset threshold applications requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for BZX58550-B4V3X 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding stable voltage references at microamp bias levels.
FAQ
What is the maximum continuous reverse current the BZX58550-B4V3X can handle without exceeding its power limit?
At ambient temperature ≤25 °C on a PCB with 35 mm² copper at the cathode tab, the device sustains up to 69.8 mA continuous reverse current (300 mW ÷ 4.3 V) before reaching its 300 mW total power dissipation limit. Derating is required above 25 °C per the 350 K/W thermal resistance specification.
Can the BZX58550-B4V3X be used in forward conduction mode as a general-purpose diode?
Yes - it exhibits a maximum forward voltage of 0.9 V at 10 mA, making it suitable for low-current steering or polarity protection. However, its 200 mA absolute maximum forward current is lower than dedicated signal diodes, and its primary design intent remains reverse-bias Zener regulation.
How does the −2.7 mV/K temperature coefficient affect voltage stability over temperature in a 0 °C to 70 °C range?
Over 0 °C to 70 °C, the Zener voltage shifts by approximately −189 µV/°C × 70 °C = −13.2 mV, resulting in a total drift of ±6.6 mV around 4.3 V - a variation of ±0.15 %. This is confirmed in Table 8 for the B-series 4.3 V variant and remains within specification for most non-precision analog sensing.
Is the SOD523 footprint compatible with standard reflow profiles for lead-free soldering?
Yes - Nexperia provides a validated reflow footprint (Figure 10) with 0.5 mm pad width, 0.4 mm solder mask opening, and 2.15 mm center-to-center spacing. The device is rated for JEDEC J-STD-020D-compliant peak temperatures up to 260 °C, with no special preheat or cooling requirements beyond standard Pb-free profiles.
BZX58550-B4V3X 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):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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-B4V3X FAQ
1.How can I place an order for BZX58550-B4V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B4V3X 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-B4V3X reliable?
The price and inventory of BZX58550-B4V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B4V3X is usually 5 days.
3.What payment methods are accepted for BZX58550-B4V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B4V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B4V3X?
BZX58550-B4V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B4V3X 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-B4V3X?
For technical support, including BZX58550-B4V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B4V3X requirements.
6.How does Aetrix verify that BZX58550-B4V3X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B4V3X 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-B4V3X meets industry standards.
7.What is the process for return or replacement of BZX58550-B4V3X?
All BZX58550-B4V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B4V3X, 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-B4V3X part is unused and in its original packaging.
Return procedure for BZX58550-B4V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B4V3X Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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