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Nexperia USA Inc. BZX58550-C4V3-QX
- Part No.:
- BZX58550-C4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:890
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Product details
Overview
BZX58550-C4V3-Q from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 4.3 V ±5 % nominal regulation at 50 μA test current, with 300 mW total power dissipation and 0.9 V forward voltage at 10 mA - optimized for battery-powered sensor nodes and automotive body electronics requiring stable low-bias reference.
For engineers reviewing the BZX58550-C4V3-Q datasheet, BZX58550-C4V3-Q pinout, BZX58550-C4V3-Q application, or BZX58550-C4V3-Q equivalent, this page delivers verified electrical characteristics, AEC-Q101 qualification status, thermal resistance values, differential resistance (95 Ω at IZ = 5 mA), and cathode/anode terminal mapping for PCB layout and low-power analog design validation.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 4.3 V reference under low-current conditions (50 μA to 5 mA), with a temperature coefficient of −2.7 mV/K and diode capacitance of 150 pF at 0 V. Its differential resistance of 95 Ω at 5 mA ensures predictable regulation slope in feedback paths.
Designed for AEC-Q101 compliance, it supports ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C, with thermal resistance from junction to ambient as low as 285 K/W when mounted on 1 cm² cathode copper area - enabling reliable operation in engine bay and infotainment subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V ±5 % at IZ = 50 μA - defines precise low-bias reference point for microcontroller reset circuits and ADC reference buffers |
| Forward Voltage | 0.9 V max at IF = 10 mA - enables minimal forward-drop biasing in dual-direction protection or clamping configurations |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - sets maximum continuous DC power handling in compact SMD layouts |
| Differential Resistance | 95 Ω max at IZ = 5 mA - determines regulation stiffness and output impedance in shunt-regulated supplies |
| Reverse Current | 4.0 μA max at VR = 2.0 V - confirms low leakage for standby-mode battery life preservation |
| Diode Capacitance | 150 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering and signal integrity in RF-adjacent analog sections |
| Temperature Coefficient | −2.7 mV/K - quantifies voltage drift per degree Celsius, critical for temperature-stable reference designs |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - must be routed to higher-potential side in shunt configuration |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and lighting drivers - eliminates need for additional qualification testing |
| Low test current operation | Specified at 50 μA - enables use in nanoampere-bias circuits such as wake-up comparators and low-power IoT sensors |
| Optimized leakage profile | Intentional minor rise in leakage current (per AN90031) - improves switching speed and reduces broadband noise in regulation loops |
| Ultra-compact SOD523 footprint | 1.2 mm × 0.8 mm body - saves >60 % board area vs. SOD323, critical for space-constrained automotive ECUs and wearables |
Applications
| Automotive Body Control Unit (BCU) | Portable Medical Sensor Node |
|---|---|
Use Scenario: Stable 4.3 V reference for LIN transceiver bias and microcontroller brown-out detection in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference providing precision threshold for reset generation and bus-level voltage monitoring. Use Value: AEC-Q101 qualification ensures reliability across −40 °C to +125 °C operating range; 95 Ω rdiff minimizes load-induced voltage shift during LIN frame transmission. |
Use Scenario: Low-power voltage reference for analog front-end of wearable ECG sensor operating from coin-cell battery. IC Role / Device Role / Timing Role: Zener-based reference source for 12-bit SAR ADC, powered intermittently to extend battery life. Use Value: 50 μA test current enables regulation at sub-10 μA quiescent current; 150 pF capacitance avoids aliasing in 1 kHz sampling band. |
| Industrial Temperature Transmitter | Smart Home Smoke Detector |
Use Scenario: Reference voltage for 4–20 mA loop transmitter IC in HVAC duct sensors. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing internal DAC reference under varying loop supply conditions. Use Value: −2.7 mV/K tempco allows predictable compensation in firmware; 300 mW Ptot accommodates transient overvoltage events without derating. |
Use Scenario: Voltage supervisor for ARM Cortex-M0+ MCU in battery-operated photoelectric smoke alarm. IC Role / Device Role / Timing Role: Reset threshold generator ensuring clean boot after alkaline battery insertion or replacement. Use Value: 4.3 V ±5 % tolerance matches MCU VDD monitor window; 4.0 μA IR at 2.0 V prevents premature discharge during 10-year shelf life. |
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-B4V3-Q | ±2 % tolerance (vs. ±5 %), 600 Ω rdiff at 5 mA | Higher precision required in calibration-critical instrumentation; less suitable for cost-sensitive consumer devices | Select when tighter voltage tolerance outweighs higher differential resistance and cost premium |
| MMSZ4V3T1G | ±5 % tolerance, SOD-123 package (2.7 mm × 1.6 mm), 500 mW Ptot | Larger footprint and higher power rating - used where thermal margin is prioritized over miniaturization | Choose when board space permits larger package and higher surge capability is needed for industrial environments |
Compared with BZX58550-C4V3-Q, the BZX58550-B4V3-Q offers tighter regulation but stiffer voltage droop under load, while MMSZ4V3T1G trades miniaturization for thermal robustness - making the C-series optimal for space-constrained automotive and portable designs demanding AEC-Q101 compliance.
Availability
BZX58550-C4V3-Q is available at Aetrix Electronics and suitable for automotive body electronics, portable medical sensors, industrial 4–20 mA transmitters, and smart home safety devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX58550-C4V3-Q 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, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage reference applications in harsh-environment automotive and portable electronics.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-C4V3-Q?
The nominal Zener voltage is 4.3 V with ±5 % tolerance, meaning breakdown occurs between 4.09 V and 4.52 V at IZ = 50 μA. The absolute maximum non-repetitive peak reverse voltage is not specified; instead, limiting values define PZSM = 40 W for 100 µs pulses. Continuous operation must remain within the 4.09–4.52 V regulation band under rated current.
Can BZX58550-C4V3-Q replace BZX58550-B4V3-Q in an existing design?
Yes, but with trade-offs: both share identical package, pinout, and nominal voltage, but the B-series has ±2 % tolerance and higher differential resistance (600 Ω vs. 95 Ω). Substitution may affect regulation accuracy and load regulation error - verify system-level tolerance budget and transient response before change.
Is thermal derating required above 25 °C ambient?
Yes. Total power dissipation drops linearly above 25 °C: from 300 mW at 25 °C to 0 mW at 150 °C junction temperature. Derating slope is 3.33 mW/°C based on Rth(j-a) = 285 K/W with 1 cm² cathode copper. Layout must ensure adequate copper area to maintain Tj < 150 °C under worst-case load.
Does the cathode marking align with standard SOD523 orientation?
Yes. Per Figure 9 in the datasheet, the cathode band is located at terminal 1, matching JEDEC SC-79 and IEC 60127-7 outlines. When viewed from top with marking bar left-aligned, pin 1 (cathode) is on the left, pin 2 (anode) on the right - consistent with industry-standard SOD523 footprint libraries.
BZX58550-C4V3-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-C4V3-QX FAQ
1.How can I place an order for BZX58550-C4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C4V3-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-C4V3-QX reliable?
The price and inventory of BZX58550-C4V3-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-C4V3-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C4V3-QX?
BZX58550-C4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C4V3-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-C4V3-QX?
For technical support, including BZX58550-C4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C4V3-QX requirements.
6.How does Aetrix verify that BZX58550-C4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C4V3-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-C4V3-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C4V3-QX?
All BZX58550-C4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C4V3-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-C4V3-QX part is unused and in its original packaging.
Return procedure for BZX58550-C4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C4V3-QX Tags
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