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Nexperia USA Inc. BZX58550-B30-QX
- Part No.:
- BZX58550-B30-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B30-QX.pdf
- Description:
- DIODE ZENER 30V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,880
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Product details
Overview
BZX58550-B30-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 30 V nominal regulation at 50 µA test current with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive bias and reference applications.
For engineers reviewing the BZX58550-B30-QX datasheet, BZX58550-B30-QX pinout, BZX58550-B30-QX application, or BZX58550-B30-QX equivalent, this page delivers verified electrical specs, thermal behavior, cathode/anode terminal roles, automotive-grade reliability data, and direct alternative part comparisons for low-power voltage reference design.
Technical Context
This device operates as a precision shunt voltage reference, optimized for low-bias operation with specified VZ = 29.4 V to 30.6 V at IZ = 50 µA and differential resistance rdiff ≤ 300 Ω at IZ = 5 mA. Its temperature coefficient is +0.05 mV/K, enabling stable regulation across −55 °C to +150 °C ambient range.
Designed for ultra-low quiescent current systems, it features intentional leakage control per AN90031 for fast switching and noise reduction, and meets AEC-Q101 stress testing for automotive under-hood and infotainment supply rail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30 V (29.4 V min / 30.6 V max at IZ = 50 µA - defines stable reference point for low-current bias networks) |
| Tolerance | ±2 % (B-series tight tolerance enables accurate voltage setting without post-calibration in sensor front-ends) |
| Power Dissipation | 300 mW (at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - supports continuous operation in space-constrained automotive modules) |
| Forward Voltage | 0.9 V max at IF = 10 mA (ensures minimal drop in reverse-polarity protection or clamp configurations) |
| Junction Temperature | −55 °C to +150 °C (AEC-Q101 qualified - validated for engine control unit (ECU) and ADAS camera module environments) |
| Thermal Resistance | 350 K/W (junction-to-ambient, with 35 mm² cathode Cu area - determines safe derating above 25 °C ambient) |
| Reverse Current | 0.05 µA max at VR = 22.8 V (low leakage preserves battery life in always-on vehicle subsystems) |
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 layouts and automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - must be held at higher potential than anode for Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail - completes shunt regulation path and defines reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables use in microamp-level battery-powered circuits like tire pressure sensors and key fobs |
| AEC-Q101 Qualification | Qualified for automotive discrete semiconductors - supports deployment in safety-compliant ECUs without additional qualification effort |
| Optimized Leakage Profile | Intentional minor rise in leakage per AN90031 - reduces switching noise in ADC reference buffers and clock conditioning stages |
| Ultra-Small Footprint | SOD523 package (1.2 × 0.8 mm) - saves >60 % board area vs. SOD323, critical for compact ADAS camera modules |
| Stable Temperature Coefficient | +0.05 mV/K - ensures <±1.5 % VZ drift over −40 °C to +125 °C junction range in engine bay applications |
Applications
| Automotive Sensor Biasing | Portable Medical Device Reference |
|---|---|
Use Scenario: Providing stable 30 V bias to MEMS pressure transducers in brake-by-wire systems. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining excitation voltage within ±2 % across temperature and battery voltage variation. Use Value: Enables <±0.5 % full-scale accuracy in pressure measurement without active regulation, reducing BOM count and power consumption. |
Use Scenario: Supplying precision reference for 16-bit SAR ADC in handheld ECG monitors. IC Role / Device Role / Timing Role: Low-noise Zener source replacing larger LDOs in ultra-low-power analog front-end chains. Use Value: Achieves 12 ppm/°C effective TC with <0.1 µA standby leakage, extending single-CR2032 battery life to >3 years. |
| Industrial IoT Node Power Monitoring | Automotive Infotainment Voltage Clamping |
Use Scenario: Monitoring 24 V supply rail integrity in smart factory wireless nodes using resistive divider + ADC. IC Role / Device Role / Timing Role: Precision clamping diode protecting ADC input against overvoltage during load dump events. Use Value: Limits transient overshoot to ≤30.6 V with <10 ns response, preventing ADC saturation and firmware lockup. |
Use Scenario: Clamping CAN transceiver VCC rail against reverse battery connection in head unit designs. IC Role / Device Role / Timing Role: Bidirectional protection element (forward-biased as rectifier, reverse-biased as Zener clamp). Use Value: Withstands 40 W non-repetitive surge (100 µs) while maintaining <0.9 V forward drop - eliminates need for separate TVS + Schottky stack. |
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-C30-Q | ±5 % tolerance (vs. ±2 %), identical VZ range and SOD523 package | Acceptable where system calibration compensates for initial tolerance, e.g., closed-loop feedback references | Select when cost sensitivity outweighs absolute accuracy requirements and post-production trimming is available |
| MMSZ5257ET1G | 30 V nominal, ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, higher rdiff (170 Ω typical) | Better power handling but 3.4× larger footprint - suitable for non-space-constrained industrial power supplies | Choose only if board layout allows larger package and thermal margin exceeds 300 mW requirement |
Compared with BZX58550-B30-QX, the C30-Q variant trades accuracy for cost in calibrated systems, while MMSZ5257ET1G offers higher power at the expense of size and noise performance - making the B30-QX optimal for AEC-Q101-compliant, space-limited, low-leakage reference designs.
Availability
BZX58550-B30-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable medical device references, industrial IoT power monitoring, and infotainment voltage clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B30-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 high-volume, high-reliability essential components including logic, discretes, MOSFETs, and bipolar transistors.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage reference and clamping in automotive and portable electronics.
FAQ
What is the maximum allowable reverse voltage before breakdown for BZX58550-B30-QX?
The device exhibits a guaranteed Zener breakdown between 29.4 V and 30.6 V at 50 µA test current, with no defined "maximum reverse voltage" prior to breakdown - it enters controlled conduction at VZ and maintains regulation up to its 300 mW power limit. Exceeding 30.6 V without current limiting risks thermal runaway.
Can BZX58550-B30-QX be used in forward-bias rectifier applications?
Yes - its forward voltage is specified at ≤0.9 V at 10 mA, making it usable as a low-drop rectifier in ultra-low-current signal paths such as ESD protection clamps or bias network isolation, though it is not optimized for high forward-current operation like dedicated Schottky diodes.
How does the AEC-Q101 qualification impact BZX58550-B30-QX's use in non-automotive designs?
AEC-Q101 qualification confirms robustness against mechanical shock, temperature cycling, and humidity exposure - providing enhanced reliability margins for industrial, medical, and aerospace applications where long-term stability and field failure avoidance are critical, even outside automotive contexts.
Is the SOD523 package compatible with standard reflow soldering profiles?
Yes - Nexperia provides a validated reflow footprint (Fig. 10) and recommends JEDEC J-STD-020-compliant profiles. Peak temperature must not exceed 260 °C, with time above 217 °C limited to 60–150 seconds; the 0.6 mm height and flat leads ensure coplanarity and minimize tombstoning risk.
BZX58550-B30-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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 270 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-B30-QX FAQ
1.How can I place an order for BZX58550-B30-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B30-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-B30-QX reliable?
The price and inventory of BZX58550-B30-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-B30-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B30-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B30-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B30-QX?
BZX58550-B30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B30-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-B30-QX?
For technical support, including BZX58550-B30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B30-QX requirements.
6.How does Aetrix verify that BZX58550-B30-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B30-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-B30-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B30-QX?
All BZX58550-B30-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B30-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-B30-QX part is unused and in its original packaging.
Return procedure for BZX58550-B30-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B30-QX Tags
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onsemi
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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