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Nexperia USA Inc. BZX58550-B51-QX
- Part No.:
- BZX58550-B51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B51-QX.pdf
- Description:
- DIODE ZENER 51V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,140
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Product details
Overview
BZX58550-B51-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 51 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-B51-QX datasheet, BZX58550-B51-QX pinout, BZX58550-B51-QX application, or BZX58550-B51-QX equivalent, this device serves as a precision, low-bias voltage reference in battery-powered sensor nodes, automotive body electronics, and portable instrumentation where stable reverse breakdown under microampere bias is critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 50.0 V to 52.0 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance of 400 Ω at IZ = 2 mA. Its ultra-low test current enables operation in energy-constrained circuits without loading sensitive bias networks.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise coupling, and is qualified to AEC-Q101 for automotive ambient temperatures from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 51 V at IZ = 50 µA - defines precise regulation point for low-power reference circuits |
| Voltage Tolerance | ±2 % - ensures tight output stability across production lots for calibrated systems |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - sets maximum continuous thermal load in standard layout |
| Forward Voltage | 0.9 V at IF = 10 mA - limits forward conduction loss during transient polarity events |
| Junction Temperature | 150 °C maximum - supports operation in under-hood automotive environments |
| Reverse Current | ≤ 0.05 µA at VR = 38.25 V - guarantees minimal leakage below regulation threshold |
| Diode Capacitance | 40 pF at VR = 0 V, f = 1 MHz - maintains signal integrity in high-frequency sensing paths |
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 automated placement and reflow soldering on space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Marked side) | Cathode (K) | Connected to regulated output node; marking bar identifies cathode for correct orientation during assembly |
| 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 use in micropower battery-backed circuits without depleting source |
| AEC-Q101 qualification | Qualified for automotive applications - ensures reliability in vibration-prone, wide-temperature environments |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise and improves transient response in feedback loops |
| Tight voltage tolerance | ±2 % series - eliminates need for post-assembly trimming in precision reference designs |
| Ultra-compact footprint | SOD523 package - saves >60 % board area vs. SOD-123, enabling dense sensor module layouts |
Applications
| Automotive Body Control Module | Portable Gas Sensor Interface |
|---|---|
|
Use Scenario: Voltage reference for analog front-end of LIN bus-connected door module sensors. IC Role / Device Role / Timing Role: Zener regulator supplying stable 51 V bias to photodiode amplifier chain. Use Value: Maintains <±0.5 % reference drift over −40 °C to +105 °C ambient, ensuring consistent gas concentration readings. |
Use Scenario: Reference element in battery-operated CO detection circuit with electrochemical cell. IC Role / Device Role / Timing Role: Low-current Zener establishing fixed bias point for transimpedance amplifier input. Use Value: Draws only 50 µA at regulation, extending AA-cell life to >2 years in standby mode. |
| Industrial IoT Edge Node | Medical Wearable Power Monitor |
|
Use Scenario: Precision voltage clamp in isolated RS-485 receiver protection stage. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting common-mode surge to 51 V ±1.02 V. Use Value: Withstands 40 W non-repetitive peak reverse power (100 µs pulse), meeting IEC 61000-4-5 Level 3. |
Use Scenario: Calibration reference in wearable ECG front-end with integrated ADC. IC Role / Device Role / Timing Role: Stable 51 V Zener used in ratiometric reference divider for gain-setting resistors. Use Value: ±2 % tolerance and +0.05 mV/K TC enable <0.1 % full-scale error over clinical operating range (15–40 °C). |
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-C51-Q | ±5 % tolerance, higher leakage current optimized for noise reduction | Better suited for high-speed switching regulators where fast transient suppression is prioritized over absolute voltage accuracy | Select when system tolerates wider regulation band but requires lower EMI in switching domains |
| MMSZ5267B-7-F | 51 V ±5 %, SOD-123 package, 500 mW Ptot, not AEC-Q101 qualified | Higher power handling but larger footprint and no automotive qualification | Choose for industrial control boards needing higher surge margin and no automotive compliance requirement |
Compared with BZX58550-B51-QX, the C51-Q variant trades voltage accuracy for improved noise immunity, while MMSZ5267B-7-F offers greater power headroom in a less space-efficient package without automotive qualification-making the B51-QX optimal for compact, safety-critical automotive sensor references.
Availability
BZX58550-B51-QX is available at Aetrix Electronics and suitable for automotive body electronics, portable gas sensing, industrial IoT edge nodes, and medical wearable power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B51-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade robustness.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, designed specifically for low-current, high-stability voltage reference applications in space- and power-constrained automotive and portable electronics.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B51-QX?
The device exhibits a nominal Zener voltage of 51 V with a guaranteed range of 50.0 V to 52.0 V at IZ = 50 µA. Below 38.25 V, reverse current remains ≤0.05 µA; breakdown is sharp and well-defined within the specified tolerance band, with no gradual onset.
Can BZX58550-B51-QX be used in place of a 5.1 V Zener diode?
No - BZX58550-B51-QX is a 51 V device, not 5.1 V. The "51" in the part number denotes nominal Zener voltage in volts. Substituting it for a 5.1 V Zener would result in catastrophic overvoltage at the regulated node and likely damage downstream circuitry.
Is the SOD523 package hand-solderable using hot air?
Yes - the SOD523 package is compatible with hot-air rework at standard profiles (peak 260 °C, 60 s max above 220 °C). Its 0.34 mm lead pitch and 0.6 mm height allow reliable reflow with appropriate stencil design and nitrogen-assisted heating to prevent tombstoning.
Does BZX58550-B51-QX require a series current-limiting resistor in all applications?
Yes - like all Zener diodes, it must be biased with a current-limiting resistor to maintain operation within its specified IZ range (50 µA typical) and avoid exceeding Ptot = 300 mW. For 51 V regulation from a 55 V supply, a minimum 80 Ω resistor is required to limit IZ to 50 mA, well below the 200 mA absolute maximum forward current.
BZX58550-B51-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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-B51-QX FAQ
1.How can I place an order for BZX58550-B51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B51-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-B51-QX reliable?
The price and inventory of BZX58550-B51-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-B51-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B51-QX?
BZX58550-B51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B51-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-B51-QX?
For technical support, including BZX58550-B51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B51-QX requirements.
6.How does Aetrix verify that BZX58550-B51-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B51-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-B51-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B51-QX?
All BZX58550-B51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B51-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-B51-QX part is unused and in its original packaging.
Return procedure for BZX58550-B51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B51-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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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