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Nexperia USA Inc. BZX58550-B20X
- Part No.:
- BZX58550-B20X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B20X.pdf
- Description:
- DIODE ZENER 20V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,652
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Product details
Overview
BZX58550-B20X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 20 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 15.2 Ω differential resistance at 5 mA - optimized for low-bias regulation in portable battery-powered systems.
For engineers reviewing the BZX58550-B20X datasheet, BZX58550-B20X pinout, BZX58550-B20X application, or BZX58550-B20X equivalent, key selection criteria include its ultra-low test current specification, tight voltage tolerance, thermal resistance of 350 K/W on standard PCB layout, and cathode-anode polarity marking per IEC 60747-2.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 20 V at IZ = 50 µA, exhibiting a temperature coefficient of +14.4 mV/K and differential resistance of 15.2 Ω at 5 mA. Its low leakage current (<0.05 µA at 16 V) supports stable biasing in high-impedance nodes.
The device uses silicon planar epitaxial construction in an ultra-small SOD523 surface-mount package (1.2 mm × 0.8 mm × 0.6 mm), with cathode identified by a marking bar. It complies with IEC 60134 absolute maximum ratings, including 200 mA forward current and 150 °C junction temperature limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 19.0 V to 21.0 V at IZ = 50 µA - ensures precise low-current reference in battery-backed circuits |
| Differential Resistance rdiff | 15.2 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² copper - defines thermal derating envelope |
| Forward Voltage VF | 0.9 V at IF = 10 mA - enables use as low-drop rectifier or clamp in dual-role designs |
| Reverse Current IR | < 0.05 µA at VR = 16 V - minimizes quiescent drain in always-on sensor bias networks |
| Temperature Coefficient SZ | +14.4 mV/K - quantifies voltage drift over temperature for stability-critical references |
| Package | SOD523 (SC-79), 1.2 mm × 0.8 mm × 0.6 mm - enables high-density placement in space-constrained wearables |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package with two leads; body dimensions 1.2 mm × 0.8 mm × 0.6 mm; cathode identified by a visible marking bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in micro-power circuits where bias current must be minimized |
| Tight voltage tolerance | ±2 % (B-series) - reduces calibration overhead in precision analog front-ends |
| Optimized leakage profile | Intentional minor rise in leakage for fast switching and noise reduction per AN90031 - improves transient response in feedback paths |
| Ultra-compact footprint | SOD523 package - saves >60 % board area vs. SOD323, critical for hearing aids and IoT sensors |
| Thermal performance | Rth(j-a) = 350 K/W with 35 mm² cathode copper - supports reliable operation without heatsinking in ambient up to 85 °C |
Applications
| Portable Battery Voltage Reference | Low-Power Sensor Bias Network |
|---|---|
Use Scenario: Providing stable 20 V reference for ADC input scaling in coin-cell-powered environmental monitors. IC Role / Device Role / Timing Role: Zener regulator establishing fixed reference potential for analog signal conditioning chain. Use Value: 50 µA test current draws negligible current from aging CR2032 cells, extending operational life beyond 5 years. |
Use Scenario: Biasing photodiode amplifier in optical smoke detector with standby current <1 µA. IC Role / Device Role / Timing Role: Low-leakage voltage clamp defining op-amp input common-mode range. Use Value: Reverse current <0.05 µA at 16 V prevents signal offset drift across -40 °C to +85 °C operating range. |
| Microcontroller Reset Threshold | USB-C Port Voltage Clamp |
Use Scenario: Generating clean 20 V threshold for brown-out detection in ARM Cortex-M0+ subsystems. IC Role / Device Role / Timing Role: Precision Zener setting hysteresis window for reset generator IC input. Use Value: ±2 % tolerance ensures deterministic reset activation at 19.6–20.4 V, eliminating firmware-level calibration. |
Use Scenario: Clamping VBUS monitoring node in USB-C power delivery negotiation circuitry. IC Role / Device Role / Timing Role: Overvoltage protection element limiting sense line to 20 V during hot-plug transients. Use Value: 300 mW power rating absorbs 100 µs surges up to 40 W without degradation per IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C20 | ±5 % tolerance, higher leakage (~0.05 µA), same VZ range and package | Acceptable where cost sensitivity outweighs precision; less suitable for calibrated instrumentation | Select when budget constraints dominate and system-level trimming is available |
| MMSZ5248B | 20 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot | Larger footprint and higher power handling; not drop-in compatible due to size and thermal profile | Choose only if board redesign permits larger package and higher thermal margin is required |
Compared with BZX58550-B20X, the C20 variant trades voltage accuracy for cost, while MMSZ5248B offers higher power but sacrifices miniaturization - making BZX58550-B20X optimal for space- and current-constrained designs requiring ±2 % stability.
Availability
BZX58550-B20X is available at Aetrix Electronics and suitable for portable battery voltage reference, low-power sensor bias network, microcontroller reset threshold, and USB-C port voltage clamp applications requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for BZX58550-B20X 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 logic, discrete, and MOSFET devices with focus on efficiency, reliability, and miniaturization for mass-market electronics.
The BZX58550 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for ultra-low-power biasing and precision voltage referencing in battery-operated and space-constrained systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B20X?
The nominal Zener voltage is 20 V, with guaranteed minimum and maximum values of 19.0 V and 21.0 V respectively at IZ = 50 µA. Breakdown begins within this band; operation below 19.0 V yields negligible reverse current (<0.05 µA), while sustained voltage above 21.0 V risks exceeding power limits under load.
Can BZX58550-B20X be used in forward conduction mode?
Yes - it exhibits a forward voltage of 0.9 V at 10 mA, consistent with standard silicon diodes. This allows dual-use as a low-drop clamp or level shifter, though its primary design intent and characterization are for reverse-biased Zener regulation at 50 µA test current.
How does the SOD523 package affect thermal performance?
Mounted on FR4 with 35 mm² cathode copper, the device achieves Rth(j-a) = 350 K/W. Without that copper area, thermal resistance rises to 460 K/W, reducing safe continuous power from 300 mW to ~270 mW - underscoring the need for proper PCB layout per Nexperia's recommended footprint.
Is BZX58550-B20X suitable for automotive applications?
No - this part is not AEC-Q200 qualified and lacks automotive-grade screening, temperature validation, or extended lifetime testing. Nexperia explicitly states non-automotive qualification in the legal disclaimers; use requires full customer validation and assumes all risk for safety-critical deployment.
BZX58550-B20X 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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.2 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-B20X FAQ
1.How can I place an order for BZX58550-B20X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B20X 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-B20X reliable?
The price and inventory of BZX58550-B20X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B20X is usually 5 days.
3.What payment methods are accepted for BZX58550-B20X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B20X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B20X?
BZX58550-B20X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B20X 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-B20X?
For technical support, including BZX58550-B20X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B20X requirements.
6.How does Aetrix verify that BZX58550-B20X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B20X 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-B20X meets industry standards.
7.What is the process for return or replacement of BZX58550-B20X?
All BZX58550-B20X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B20X, 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-B20X part is unused and in its original packaging.
Return procedure for BZX58550-B20X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B20X Tags
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MM5Z5V1ST1G
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