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Nexperia USA Inc. BZX58550-B47X
- Part No.:
- BZX58550-B47X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B47X.pdf
- Description:
- DIODE ZENER 47V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,942
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Product details
Overview
BZX58550-B47X 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 47 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 375 Ω differential resistance at 2 mA, enabling stable operation in portable battery-powered sensor nodes and IoT endpoint regulators.
For engineers reviewing the BZX58550-B47X datasheet, BZX58550-B47X pinout, BZX58550-B47X application, or BZX58550-B47X equivalent, key selection criteria include its 47 V nominal Zener voltage, low 50 µA test current requirement, ±2 % tolerance grade, SOD523 footprint compatibility, and thermal resistance of 350 K/W on 35 mm² cathode copper area.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its anode–cathode terminals under controlled current conditions. Its Zener voltage is specified at IZ = 50 µA, making it suitable for low-quiescent-current bias networks where leakage minimization is critical.
The BZX58550-B47X belongs to the "B" tolerance series (±2 %), exhibits a temperature coefficient of +0.05 mV/K, and features a diode capacitance of 40 pF at 0 V and 1 MHz - parameters directly supporting noise-sensitive analog front-end referencing and low-energy microcontroller reset circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 46.1 V to 47.9 V at IZ = 50 µA - ensures tight 47 V reference for precision analog sensing and ADC reference scaling |
| Tolerance | ±2 % - enables high-accuracy voltage clamping without post-production trimming in space-constrained designs |
| Differential Resistance (rdiff) | 375 Ω at IZ = 2 mA - defines regulation stiffness; lower than C-series variants for improved load transient rejection |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - supports continuous operation in thermally limited PCB layouts |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - allows predictable forward conduction during power-up sequencing or polarity protection |
| Reverse Current (IR) | 0.05 µA at VR = 32.9 V - guarantees minimal standby leakage in always-on battery monitoring circuits |
| Package | SOD523 (SC-79), 1.2 mm × 0.8 mm × 0.6 mm - enables high-density placement in wearable and medical patch devices |
Pinout & Package
SOD523 (SC-79) surface-mount plastic package with flat lead profile, 2-terminal configuration, and cathode identified by a marking bar on the device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; heat-sinking path via cathode pad; polarity indicator for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or current-limiting resistor; forms shunt path for excess current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces quiescent current draw in coin-cell-powered devices by >90 % versus standard 5 mA Zeners |
| Ultra-small SOD523 footprint | 1.2 mm × 0.8 mm body - saves >60 % board area vs. SOD123, enabling integration into sub-10 mm² modules |
| Controlled leakage optimization | Intentional minor IR rise per AN90031 - improves switching speed and reduces broadband noise in RF bias networks |
| Thermal performance | Rth(j-a) = 350 K/W with 35 mm² cathode Cu - sustains 270 mW derated power at 70 °C ambient in compact enclosures |
Applications
| Portable Gas Sensor Biasing | IoT Node Voltage Reference |
|---|---|
|
Use Scenario: Providing stable 47 V bias to electrochemical gas sensor electrodes in battery-operated air quality monitors. IC Role / Device Role / Timing Role: Shunt Zener regulator establishing fixed electrode potential independent of battery voltage decay. Use Value: Enables <1 % full-scale measurement drift over 0–4.2 V Li-ion discharge range due to ±2 % VZ tolerance and low 50 µA operating current. |
Use Scenario: Generating a precise 47 V reference for high-voltage ADC input scaling in NB-IoT telemetry transmitters. IC Role / Device Role / Timing Role: Passive voltage reference source feeding resistive divider network upstream of SAR ADC driver stage. Use Value: Delivers 40 pF capacitance and 375 Ω dynamic impedance to minimize sampling error and settle within 1.2 µs at 1 MSPS. |
| Wearable ECG Front-End Clamping | Industrial PLC Input Protection |
|
Use Scenario: Clamping high-impedance biopotential amplifier inputs against ESD and overvoltage in clinical-grade wearables. IC Role / Device Role / Timing Role: Low-leakage (0.05 µA) shunt clamp limiting input swing to ±47 V while preserving signal integrity. Use Value: Prevents amplifier saturation during 8 kV HBM ESD events without injecting measurable offset (<0.5 µV) into µV-level ECG signals. |
Use Scenario: Protecting 24 V industrial analog input channels from field-wiring transients in factory automation controllers. IC Role / Device Role / Timing Role: Secondary Zener clamp staged after TVS diode to absorb residual energy below 50 V threshold. Use Value: Absorbs up to 270 mW continuously at 70 °C ambient, extending system uptime by eliminating false trips during 100 ms surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C47 | ±5 % tolerance (44.0 V–50.0 V), higher rdiff = 400 Ω at 2 mA, same 40 pF capacitance | Acceptable where absolute voltage accuracy is secondary to cost reduction in non-critical supply rails | Select when budget constraints outweigh need for <1 % regulation stability in production calibration workflows |
| MMSZ47ET1G | ±5 % tolerance, SOD-123 package (2.7 mm × 1.4 mm), Ptot = 500 mW, rdiff = 100 Ω at 5 mA | Higher power handling but 3.4× larger footprint; better for high-current bias but incompatible with ultra-dense layouts | Choose only if thermal margin >400 mW is required and PCB real estate permits SOD-123 placement |
Compared with BZX58550-C47 and MMSZ47ET1G, the BZX58550-B47X uniquely balances ±2 % accuracy, SOD523 miniaturization, and 50 µA low-current operation - making it irreplaceable in space- and power-constrained analog subsystems where regulation precision cannot be compromised.
Availability
BZX58550-B47X is available at Aetrix Electronics and suitable for portable gas sensor biasing, IoT node voltage reference, wearable ECG front-end clamping, and industrial PLC input protection requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX58550-B47X 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 discrete and logic devices, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The BZX58550 series was engineered specifically for ultra-low-power voltage regulation in battery-constrained edge devices, emphasizing minimal test current, tight tolerance, and miniature packaging without sacrificing thermal robustness.
FAQ
What is the maximum continuous reverse power dissipation for BZX58550-B47X at 70 °C ambient?
At 70 °C ambient temperature, the BZX58550-B47X is rated for 270 mW continuous reverse power dissipation when mounted on an FR4 PCB with approximately 35 mm² copper area at the cathode tab, per Table 5 limiting values and thermal derating curves in the datasheet.
Does BZX58550-B47X support bidirectional transient suppression?
No - the BZX58550-B47X is a unidirectional Zener diode optimized for reverse-biased voltage regulation. It conducts only in reverse breakdown (cathode positive relative to anode) and provides no meaningful forward surge clamping capability beyond its 0.9 V forward voltage at 10 mA.
Can BZX58550-B47X replace a 47 V Zener with 5 mA test current in an existing design?
Yes, but with critical design adjustments: the BZX58550-B47X requires re-biasing to operate at its specified 50 µA test current, not 5 mA. Its differential resistance rises significantly below 1 mA, so the series current-limiting resistor must be increased ~100× to maintain regulation accuracy and avoid thermal runaway.
Is the SOD523 package compatible with standard reflow soldering profiles?
Yes - the BZX58550-B47X's SOD523 package is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260 °C. Figure 10 in the datasheet provides the recommended solder land pattern (1.2 mm × 0.5 mm pads, 0.4 mm spacing), and thermal resistance data confirms reliable joint formation under IPC-A-610 Class 2 conditions.
BZX58550-B47X 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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-B47X FAQ
1.How can I place an order for BZX58550-B47X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B47X 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-B47X reliable?
The price and inventory of BZX58550-B47X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B47X is usually 5 days.
3.What payment methods are accepted for BZX58550-B47X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B47X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B47X?
BZX58550-B47X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B47X 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-B47X?
For technical support, including BZX58550-B47X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B47X requirements.
6.How does Aetrix verify that BZX58550-B47X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B47X 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-B47X meets industry standards.
7.What is the process for return or replacement of BZX58550-B47X?
All BZX58550-B47X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B47X, 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-B47X part is unused and in its original packaging.
Return procedure for BZX58550-B47X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B47X Tags
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