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Nexperia USA Inc. BZX58550-C43-QX
- Part No.:
- BZX58550-C43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C43-QX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
BZX58550-C43-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 43 V nominal regulation at 50 µA test current, with ±5 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-C43-QX datasheet, BZX58550-C43-QX pinout, BZX58550-C43-QX application, or BZX58550-C43-QX equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor nodes, automotive body electronics, and portable instrumentation where leakage-sensitive regulation is required.
Technical Context
This Zener diode operates in reverse breakdown with specified VZ = 40.85 V to 45.15 V at IZ = 50 µA, exhibiting differential resistance ≤ 375 Ω and temperature coefficient of +0.05 mV/K. Its low test current enables stable regulation under micro-power conditions.
The device features intentional minor leakage rise per AN90031 to improve switching speed and reduce noise, and achieves thermal resistance Rth(j-a) = 350 K/W when mounted on FR4 PCB with 35 mm² copper area at cathode tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V (range 40.85 V to 45.15 V at IZ = 50 µA - defines regulation setpoint in low-current bias circuits) |
| Tolerance | ±5 % (C-series - tighter than standard Zeners for predictable clamping in safety-critical automotive subsystems) |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C with 35 mm² Cu - sets maximum continuous power handling on standard PCB layout) |
| Test Current | 50 µA - enables stable regulation in µA-level bias networks, e.g., MCU reset supervisors or sensor signal conditioning) |
| Forward Voltage | 0.9 V at IF = 10 mA - ensures low-loss forward conduction during transient overvoltage events) |
| Junction Temperature | 150 °C max - supports operation in under-hood automotive environments without derating) |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC stress test protocol) |
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 assembly and automated reflow soldering.
| 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 rail; reverse-biased configuration enables Zener breakdown regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable voltage reference in battery-powered systems with sub-100 µA quiescent current budgets |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and improves noise immunity in signal-path protection |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress test requirements for temperature cycling, HTRB, and ESD robustness |
| Ultra-compact SOD523 package | 1.2 mm × 0.8 mm footprint - saves board space in space-constrained modules such as door control units and LED driver ICs |
| Two tolerance options | ±2 % (B-series) and ±5 % (C-series) - allows cost/performance trade-off selection without redesigning PCB layout |
Applications
| Automotive Body Control Module | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Voltage reference for analog front-end of LIN bus-connected door lock actuator. IC Role / Device Role / Timing Role: Zener regulator supplying stable 43 V bias to op-amp gain stage in current-sense amplifier. Use Value: Enables accurate current measurement across wide ambient range (−40 °C to +125 °C) with <±5 % regulation error and no additional bias current overhead. |
Use Scenario: Reference voltage source for electrochemical CO sensor signal conditioning in handheld detector. IC Role / Device Role / Timing Role: Low-leakage Zener providing 43 V bias to transimpedance amplifier feedback network. Use Value: Maintains sensor linearity and offset stability over 10-year battery life due to 50 µA test current and <1 µA IR at VR = 30 V. |
| Industrial PLC Input Protection | Medical Wearable Power Monitor |
Use Scenario: Overvoltage clamp on 24 V DC input channel of DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Fast-response Zener shunt protecting downstream ADC and isolation barrier from surge events. Use Value: Limits transient voltage to ≤45.15 V with 375 Ω rdiff, preventing damage while minimizing power dissipation during brief spikes. |
Use Scenario: Precision voltage reference for battery voltage monitoring circuit in rechargeable ECG patch. IC Role / Device Role / Timing Role: Regulator establishing known threshold for low-battery warning comparator. Use Value: Delivers consistent 43 V reference across 0.1–10 µA load variations, enabling accurate state-of-charge estimation with <0.5 % hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B43-Q | ±2 % tolerance (vs. ±5 %), higher test current sensitivity, lower rdiff (≤375 Ω vs. ≤375 Ω same), identical package and thermal specs | Used where tighter regulation accuracy is required in high-precision analog sensing, not general-purpose clamping | Select BZX58550-B43-Q only if system-level calibration tolerances demand <±2 % VZ drift over temperature and lifetime |
| MMSZ5265ET1G | SOD-123 package (2.7 mm × 1.4 mm), 43 V ±5 %, 500 mW Ptot, 100 µA test current, no AEC-Q101 qualification | Suitable for industrial/commercial boards with larger layout margin but not automotive under-hood deployment | Choose MMSZ5265ET1G only for non-automotive designs requiring higher power headroom and relaxed size constraints |
Compared with BZX58550-B43-Q, this C43-QX offers relaxed tolerance for cost-sensitive automotive modules; versus MMSZ5265ET1G, it delivers AEC-Q101 compliance and 40 % smaller footprint at the expense of 200 mW lower power rating - critical for space-limited, safety-certified applications.
Availability
BZX58550-C43-QX is available at Aetrix Electronics and suitable for automotive body electronics, portable gas detection systems, industrial PLC input protection, and medical wearable power monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX58550-C43-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 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 regulation in automotive subsystems and portable electronics where size, leakage, and qualification are design-critical.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX58550-C43-QX has a nominal Zener voltage of 43 V, with a guaranteed range of 40.85 V to 45.15 V at 50 µA test current. Its absolute maximum reverse voltage is defined by its limiting values: non-repetitive peak reverse power dissipation is 40 W for 100 µs pulses, but sustained reverse bias must remain within the specified VZ window to avoid parametric shift or degradation.
Is this part suitable for use in automotive under-hood applications?
Yes - the BZX58550-C43-QX is fully qualified to AEC-Q101 standards, including temperature cycling, high-temperature reverse bias (HTRB), and ESD testing. It operates reliably from −55 °C to +150 °C junction temperature and is recommended by Nexperia for automotive body electronics, lighting control, and powertrain auxiliary circuits.
How does the "intentional minor rise of leakage current" affect circuit performance?
Per AN90031, the controlled increase in reverse leakage improves switching speed and reduces noise in dynamic regulation scenarios. In practice, this yields faster response to transient overvoltages and lower broadband noise coupling into adjacent analog signals - verified in automotive CAN node power rail filtering applications.
Can this diode be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, making parallel connection unstable and prone to thermal runaway. The BZX58550-C43-QX is rated for 300 mW at 25 °C ambient with 35 mm² copper; higher power must be achieved via external heat sinking or alternative topology (e.g., series pass regulation).
BZX58550-C43-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 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-C43-QX FAQ
1.How can I place an order for BZX58550-C43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C43-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-C43-QX reliable?
The price and inventory of BZX58550-C43-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-C43-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C43-QX?
BZX58550-C43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C43-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-C43-QX?
For technical support, including BZX58550-C43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C43-QX requirements.
6.How does Aetrix verify that BZX58550-C43-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C43-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-C43-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C43-QX?
All BZX58550-C43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C43-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-C43-QX part is unused and in its original packaging.
Return procedure for BZX58550-C43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C43-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
Diodes Incorporated
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