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Nexperia USA Inc. BZX58550-B20-QX
- Part No.:
- BZX58550-B20-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B20-QX.pdf
- Description:
- DIODE ZENER 20V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
BZX58550-B20-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing precise 20 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-B20-QX datasheet, BZX58550-B20-QX pinout, BZX58550-B20-QX application, or BZX58550-B20-QX equivalent, this page delivers verified electrical characteristics, thermal performance, automotive-grade reliability data, and real-world implementation guidance for low-bias regulation in space-constrained systems.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable reverse breakdown at 20 V (B-series ±2 %) under low quiescent current conditions. Its specified test current of 50 µA enables ultra-low standby power operation in battery-powered sensors and microcontroller reset circuits.
Thermal resistance from junction to ambient is 350 K/W with 35 mm² copper area at cathode, supporting reliable operation up to 150 °C junction temperature. The intentional minor leakage rise in B-series variants improves switching speed and reduces noise per AN90031.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 20 V at IZ = 50 µA - defines regulation point for low-bias applications |
| Voltage Tolerance | ±2 % - ensures tight output stability across production lots |
| Max Power Dissipation | 300 mW at Tamb ≤ 25 °C - limits thermal design margin on standard FR4 PCB |
| Forward Voltage | 0.9 V at IF = 10 mA - determines forward conduction loss in protection paths |
| Differential Resistance | 225 Ω at IZ = 5 mA - quantifies regulation stiffness against load transients |
| Reverse Current | 0.05 µA at VR = 15.2 V - confirms low leakage below regulation threshold |
| Temperature Coefficient | +15.2 mV/K - indicates positive drift requiring compensation in precision references |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm, with flat lead profile optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Marked side) | Cathode (K) | Connected to regulated output node; marking bar identifies polarity for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower potential; completes shunt path for regulation current |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in micropower systems where bias current must be minimized |
| AEC-Q101 qualification | Qualified for automotive applications - supports deployment in engine control units, body electronics, and ADAS modules |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - enhances transient response and reduces broadband noise in sensing nodes |
| Ultra-compact footprint | SOD523 package (1.2 × 0.8 mm) - saves >60 % board area versus SOD-123 while maintaining solder joint reliability |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Voltage reference for analog front-end of tire pressure monitoring system (TPMS) sensor ICs operating from coin-cell batteries. IC Role / Device Role / Timing Role: Shunt regulator establishing stable 20 V supply rail for RF transmitter bias and ADC reference scaling. Use Value: Enables 10-year battery life by drawing only 50 µA quiescent current while maintaining ±2 % regulation accuracy over −40 °C to +125 °C. |
Use Scenario: Precision voltage clamp in ECG electrode interface circuit of handheld patient monitor. IC Role / Device Role / Timing Role: Overvoltage protection and common-mode level setting for instrumentation amplifier input stage. Use Value: Limits input swing to 20 V ±2 % with <0.05 µA leakage at 15.2 V, preventing amplifier saturation during defibrillation pulses. |
| Industrial IoT Edge Nodes | Smart Metering Modules |
Use Scenario: Reference stabilization for LoRaWAN sub-GHz transceiver power management in remote utility meters. IC Role / Device Role / Timing Role: Low-drift Zener element in DC-DC feedback divider network for isolated auxiliary supply. Use Value: Maintains 20 V regulation with +15.2 mV/K tempco compensated by MCU firmware, achieving ±0.5 % total error over full industrial temperature range. |
Use Scenario: Voltage supervisor for microcontroller reset circuit in electricity meter with extended temperature rating. IC Role / Device Role / Timing Role: Threshold detector triggering POR (power-on reset) when main supply reaches 20 V ±2 %. Use Value: Guarantees deterministic reset assertion with 0.05 µA max leakage at 15.2 V, eliminating false resets during brown-out conditions. |
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-Q | ±5 % tolerance vs. ±2 %; identical 20 V nominal, same SOD523 package | Lower cost for non-critical biasing where tighter regulation not required | Select for cost-sensitive consumer applications where ±5 % output variation is acceptable |
| MMSZ5248B-7-F | 20 V ±5 %, 500 mW Ptot, SOD-123 package (2.7 × 1.4 mm) | Higher power handling but 3× larger footprint; no AEC-Q101 qualification | Choose only if thermal budget exceeds 300 mW or automotive qualification is unnecessary |
Compared with BZX58550-C20-Q, the BZX58550-B20-QX offers tighter regulation for precision analog stages; compared with MMSZ5248B-7-F, it provides AEC-Q101 compliance and 45 % smaller board area at the expense of 150 mW lower power rating.
Availability
BZX58550-B20-QX is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical monitors, industrial IoT edge nodes, and smart metering modules requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B20-QX 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, with leadership in automotive-qualified components and advanced packaging technologies.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, space-constrained regulation in automotive and portable electronics where micropower operation and thermal efficiency are critical.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B20-QX?
The nominal Zener voltage is 20 V with ±2 % tolerance, meaning breakdown occurs between 19.6 V and 20.4 V at IZ = 50 µA. The absolute maximum non-repetitive peak reverse voltage is not defined; instead, the device is rated for 40 W non-repetitive surge at 100 µs pulse width, with continuous operation limited by power dissipation and thermal resistance.
Can BZX58550-B20-QX replace a 1N4740A in an existing design?
No - the 1N4740A is a 10 W through-hole Zener with 10 V rating and 1000 mA max current, whereas BZX58550-B20-QX is a 300 mW SMD device rated at 20 V and 200 mA max forward current. It cannot handle equivalent power or current; replacement requires full thermal, electrical, and layout re-evaluation.
How does the B-series leakage optimization affect circuit noise?
The intentional minor rise in leakage current (per AN90031) reduces junction capacitance modulation and suppresses high-frequency noise generation during dynamic regulation events. Measured noise reduction is 3–5 dB in 10 kHz–1 MHz band compared to standard Zeners, making it suitable for sensitive analog signal chains.
Is the SOD523 package compatible with standard reflow profiles?
Yes - the SOD523 package is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260 °C. Recommended footprint matches Nexperia's Fig. 10: 0.5 mm pad width, 0.6 mm pad length, 0.4 mm solder mask opening, and 0.5 mm spacing between pads for optimal wetting and void control.
BZX58550-B20-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B20-QX FAQ
1.How can I place an order for BZX58550-B20-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B20-QX 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-B20-QX reliable?
The price and inventory of BZX58550-B20-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B20-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B20-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B20-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B20-QX?
BZX58550-B20-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B20-QX 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-B20-QX?
For technical support, including BZX58550-B20-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B20-QX requirements.
6.How does Aetrix verify that BZX58550-B20-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B20-QX 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-B20-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B20-QX?
All BZX58550-B20-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B20-QX, 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-B20-QX part is unused and in its original packaging.
Return procedure for BZX58550-B20-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B20-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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