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Nexperia USA Inc. BZX58550-B3V3-QX
- Part No.:
- BZX58550-B3V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B3V3-QX.pdf
- Description:
- DIODE ZENER 3.3V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,472
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Product details
Overview
BZX58550-B3V3-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 3.3 V ±2 % nominal regulation at 50 µA test current, with 300 mW total power dissipation and 0.9 V forward voltage at 10 mA - optimized for low-bias, battery-powered systems requiring stable reference voltage under light load.
For engineers reviewing the BZX58550-B3V3-QX datasheet, BZX58550-B3V3-QX pinout, BZX58550-B3V3-QX application, or BZX58550-B3V3-QX equivalent, key selection criteria include its AEC-Q101 qualification, ultra-small 1.2 mm × 0.8 mm footprint, low leakage profile, and specified differential resistance of ≤600 Ω at 50 µA - critical for precision biasing in automotive sensor interfaces and portable power management.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 3.3 V reverse breakdown voltage across its cathode-anode terminals under controlled current conditions. Its regulation is defined at IZ = 50 µA, with differential resistance ≤600 Ω and temperature coefficient of −3.5 mV/K - enabling predictable drift behavior in ambient temperature variations.
The diode exhibits low forward voltage (≤0.9 V at 10 mA) and low capacitance (160 pF at 0 V, 1 MHz), supporting fast transient response and minimal signal coupling in mixed-signal circuits. Its AEC-Q101 qualification confirms robustness for automotive-grade operation across −55 °C to +150 °C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V ±2 % at IZ = 50 µA - precise reference for low-power analog sensing and microcontroller reset circuits |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - defines maximum continuous bias current capability |
| Forward Voltage | ≤0.9 V at IF = 10 mA - enables efficient forward conduction in protection or clamping configurations |
| Differential Resistance | ≤600 Ω at IZ = 50 µA - ensures tight regulation stability under varying load currents |
| Reverse Current | ≤1.5 µA at VR = 2.0 V - guarantees low quiescent leakage in battery-critical applications |
| Diode Capacitance | 160 pF at VR = 0 V, f = 1 MHz - minimizes high-frequency noise coupling in RF-adjacent circuits |
| Junction Temperature | 150 °C maximum - supports operation in under-hood automotive environments |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package: 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small footprint ideal for space-constrained PCBs; cathode identified by marking bar on package top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker determines correct orientation for reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor nodes |
| Low test current regulation | Specified at 50 µA - enables use in µA-level standby circuits without compromising accuracy |
| Ultra-small SOD523 package | 1.2 mm × 0.8 mm footprint - reduces PCB area by >50 % vs. SOD323, critical for wearables and compact ECUs |
| Controlled temperature coefficient | −3.5 mV/K - enables predictable voltage drift compensation in temperature-sensitive references |
| Optimized leakage profile | 1.5 µA max at 2.0 V reverse - extends battery life in always-on monitoring circuits |
Applications
| Automotive Sensor Biasing | Portable Device Reset Circuit |
|---|---|
Use Scenario: Providing stable 3.3 V reference for MEMS pressure sensor front-end amplifiers in engine manifold modules. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precision bias point for op-amp input stage and ADC reference divider. Use Value: Maintains <±1 % output stability over −40 °C to +125 °C, ensuring consistent sensor gain calibration without active regulation overhead. |
Use Scenario: Generating clean reset threshold for ultra-low-power Bluetooth LE SoC in hearing aids. IC Role / Device Role / Timing Role: Zener-based reset supervisor triggering POR when supply drops below 3.0 V during coin-cell brownout. Use Value: Draws only 50 µA during regulation, extending single-cell battery life beyond 12 months in sleep mode. |
| Industrial IoT Node Reference | USB-C Port Protection Clamp |
Use Scenario: Supplying accurate 3.3 V reference to SAR ADC measuring thermocouple outputs in wireless condition monitors. IC Role / Device Role / Timing Role: Low-noise voltage reference source with 160 pF capacitance minimizing sampling error from digital switching noise. Use Value: Differential resistance ≤600 Ω ensures <0.5 LSB error contribution across full 12-bit conversion range. |
Use Scenario: Clamping VBUS line transients during hot-plug events in USB-C peripheral dongles. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing ESD pulses while limiting overshoot to <3.6 V. Use Value: 0.9 V forward voltage allows series diode integration for bidirectional clamping without additional components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C3V3-Q | Same 3.3 V nominal voltage but ±5 % tolerance and higher leakage (≤7.5 µA at 2.0 V) | Acceptable where cost sensitivity outweighs precision; not recommended for battery-critical designs | Select for non-automotive consumer products where AEC-Q101 is unnecessary and tighter tolerance is not required |
| MMSZ5226B-7-F | 3.3 V ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot, higher rdiff (≤1000 Ω) | Larger footprint and higher thermal mass; suitable for higher-power industrial supplies | Choose when board space permits larger package and higher power margin is needed for surge immunity |
Compared with BZX58550-C3V3-Q, the BZX58550-B3V3-QX delivers tighter tolerance and lower leakage for precision battery operation; versus MMSZ5226B-7-F, it trades power handling for 55 % smaller footprint and superior low-current regulation - making it optimal for space- and energy-constrained automotive and portable designs.
Availability
BZX58550-B3V3-QX is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical wearables, industrial IoT edge nodes, and USB-C accessory designs requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B3V3-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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage reference and biasing in automotive electronics and portable battery-powered systems.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX58550-B3V3-QX has a nominal Zener voltage of 3.3 V ±2 %, meaning its reverse breakdown occurs between 3.23 V and 3.37 V at 50 µA test current. It is not rated for sustained operation above this range; exceeding 3.6 V risks uncontrolled conduction and thermal runaway due to its 300 mW power limit.
Can this diode be used in forward-biased configuration?
Yes - it functions as a standard silicon diode in forward bias with VF ≤ 0.9 V at 10 mA. This enables dual-use applications such as reverse-polarity protection in series with the cathode or low-drop clamping in signal paths, leveraging its small size and predictable forward characteristics.
How does the SOD523 package affect thermal performance?
Mounted on FR4 with 35 mm² cathode copper, the SOD523 package achieves Rth(j-a) = 350 K/W, allowing 300 mW dissipation at ≤25 °C ambient. Without copper enhancement, thermal resistance rises to 460 K/W - limiting usable power to ~180 mW, so layout-aware thermal design is essential for sustained operation.
Is this part suitable for use in safety-critical automotive subsystems?
No - although AEC-Q101 qualified, the BZX58550-B3V3-QX is not designed, warranted, or validated for safety-critical systems (e.g., airbag controllers or brake-by-wire). It is approved for non-safety automotive applications like cabin sensors, infotainment power rails, and body control modules per Nexperia's legal disclaimers.
BZX58550-B3V3-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):
- 3.3 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 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-B3V3-QX FAQ
1.How can I place an order for BZX58550-B3V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B3V3-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-B3V3-QX reliable?
The price and inventory of BZX58550-B3V3-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-B3V3-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B3V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B3V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B3V3-QX?
BZX58550-B3V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B3V3-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-B3V3-QX?
For technical support, including BZX58550-B3V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B3V3-QX requirements.
6.How does Aetrix verify that BZX58550-B3V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B3V3-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-B3V3-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B3V3-QX?
All BZX58550-B3V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B3V3-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-B3V3-QX part is unused and in its original packaging.
Return procedure for BZX58550-B3V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B3V3-QX Tags
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