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Nexperia USA Inc. BZX58550-C30-QX
- Part No.:
- BZX58550-C30-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C30-QX.pdf
- Description:
- DIODE ZENER 30V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,242
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Product details
Overview
BZX58550-C30-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in space-constrained automotive and portable electronics. It delivers a nominal 30 V Zener voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and qualified AEC-Q101 reliability.
For engineers reviewing the BZX58550-C30-QX datasheet, BZX58550-C30-QX pinout, BZX58550-C30-QX application, or BZX58550-C30-QX equivalent, this page provides verified electrical characteristics, thermal performance data, automotive qualification status, and real-world use context for low-power regulation in battery-powered systems.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable output voltage across varying load and temperature conditions. Its specified Zener voltage of 30 V is measured at IZ = 50 µA, enabling ultra-low quiescent current operation ideal for standby circuits and sensor biasing.
The BZX58550-C30-QX exhibits a positive temperature coefficient of +24.4 mV/K and differential resistance of ≤300 Ω at IZ = 5 mA, supporting predictable thermal drift compensation in analog front-ends. Its 50 pF junction capacitance at VR = 0 V ensures minimal signal coupling in high-frequency sensing paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V to 31.5 V at IZ = 50 µA - tight ±2 % tolerance enables accurate reference without trimming |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - supports continuous operation in compact layouts |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - low conduction loss when used in forward-biased protection configurations |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 22.8 V - negligible leakage preserves battery life in always-on monitoring circuits |
| Differential Resistance (rdiff) | ≤ 300 Ω at IZ = 5 mA - stable regulation under small-signal load variations |
| Thermal Resistance (Rth(j-a)) | 350 K/W with 35 mm² cathode copper - enables reliable thermal management without heatsinking |
| Temperature Coefficient (SZ) | +24.4 mV/K - predictable positive drift allows compensation in multi-diode 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 and cathode marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marked by physical bar on package body |
| 2 (A) | Anode | Connected to ground or lower-potential rail; defines reverse-bias polarity for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications per stress test standard |
| Low test current operation | Specified at 50 µA - minimizes supply current in battery-backed real-time clocks and memory retention circuits |
| Optimized leakage profile | Intentional minor rise in IR improves switching speed and reduces noise in feedback loops |
| Ultra-compact SOD523 footprint | 1.2 mm × 0.8 mm area - enables placement in dense PCB regions near microcontrollers and sensors |
| Stable ±2 % tolerance | Tighter than standard Zener series - eliminates need for external calibration in cost-sensitive designs |
Applications
| Automotive Sensor Biasing | Portable Device Power Monitoring |
|---|---|
Use Scenario: Providing stable reference voltage for analog-to-digital conversion of engine coolant temperature or pressure signals in ECUs. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise 30 V reference point for ADC input scaling. Use Value: Enables <1 % full-scale error in sensor readings over −40 °C to +125 °C ambient range due to AEC-Q101 qualification and controlled tempco. |
Use Scenario: Monitoring lithium-ion battery voltage during deep-sleep mode in wearables and IoT trackers. IC Role / Device Role / Timing Role: Low-leakage voltage clamp regulating supervisor IC input to prevent false wake-up events. Use Value: Delivers ≤0.05 µA reverse current at 22.8 V, extending battery shelf life beyond 12 months without maintenance. |
| Industrial PLC Input Protection | Medical Diagnostic Equipment Reference |
Use Scenario: Protecting 24 V DC input channels of programmable logic controllers against transient overvoltage. IC Role / Device Role / Timing Role: Clamp diode absorbing ESD and surge energy while maintaining baseline regulation integrity. Use Value: Withstands 40 W non-repetitive peak reverse power (tp = 100 µs), meeting IEC 61000-4-2 Level 4 requirements. |
Use Scenario: Generating calibrated excitation voltage for precision photodiode amplifiers in blood oximetry modules. IC Role / Device Role / Timing Role: Stable 30 V reference source for transimpedance amplifier bias networks. Use Value: Achieves <±0.5 % long-term stability due to low rdiff (≤300 Ω) and minimal thermal hysteresis in medical-grade PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B30-Q | Same 30 V nominal VZ, but ±5 % tolerance (vs. ±2 % for C-series) | Acceptable where calibration is performed downstream; higher leakage at low VR | Select when cost sensitivity outweighs precision requirement and no AEC-Q101 validation is needed |
| MMSZ5257ET1G | 30 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot | Larger footprint and higher power rating - suited for industrial power rails, not space-constrained automotive modules | Choose only if board layout permits larger package and thermal margin exceeds 300 mW requirement |
Compared with BZX58550-B30-Q, the C30-QX offers tighter tolerance and automotive qualification; versus MMSZ5257ET1G, it trades power headroom for 55 % smaller PCB area and guaranteed AEC-Q101 compliance - critical for modern ADAS sensor nodes.
Availability
BZX58550-C30-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable device power monitoring, industrial PLC input protection, and medical diagnostic equipment reference requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-C30-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 quality.
The BZX58550-Q series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for precision voltage referencing in space- and power-constrained automotive and portable electronics.
FAQ
What is the maximum reverse voltage the BZX58550-C30-QX can withstand before breakdown?
The device is rated for a nominal Zener voltage of 30 V at 50 µA test current, with guaranteed minimum and maximum values of 28.5 V and 31.5 V respectively. It does not have a separate "maximum reverse voltage" rating - operation above 31.5 V will cause increasing reverse current per its V-I curve, and absolute maximum reverse power must remain below 40 W for non-repetitive pulses (tp = 100 µs) to avoid damage.
Is the BZX58550-C30-QX suitable for use in high-frequency signal paths?
Yes - its junction capacitance is 50 pF at VR = 0 V and f = 1 MHz, making it suitable for decoupling and reference stabilization in signal chains up to ~10 MHz. However, for RF bypass applications above 100 MHz, lower-capacitance alternatives like RF-specific Zeners or ceramic capacitors are preferred due to parasitic inductance limitations of the SOD523 package.
How does the "intentional minor rise of leakage current" benefit circuit performance?
This design feature, documented in AN90031, slightly increases reverse leakage near breakdown to reduce minority-carrier lifetime, resulting in faster turn-off response and lower broadband noise generation - particularly beneficial in feedback networks of switching regulators and high-gain sensor amplifiers where diode-induced noise or slow recovery could degrade stability or SNR.
Can the BZX58550-C30-QX be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients at low currents and positive ones at higher currents, causing thermal runaway when paralleled without individual ballast resistors. The datasheet specifies single-device operation only; for >300 mW dissipation, use a higher-rated Zener or active regulation instead.
BZX58550-C30-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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 22.8 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-C30-QX FAQ
1.How can I place an order for BZX58550-C30-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C30-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-C30-QX reliable?
The price and inventory of BZX58550-C30-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-C30-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C30-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C30-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C30-QX?
BZX58550-C30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C30-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-C30-QX?
For technical support, including BZX58550-C30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C30-QX requirements.
6.How does Aetrix verify that BZX58550-C30-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C30-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-C30-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C30-QX?
All BZX58550-C30-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C30-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-C30-QX part is unused and in its original packaging.
Return procedure for BZX58550-C30-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C30-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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