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Nexperia USA Inc. BZX58550-B30X
- Part No.:
- BZX58550-B30X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B30X.pdf
- Description:
- DIODE ZENER 30V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,124
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Product details
Overview
BZX58550-B30X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 30 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 22.8 µA reverse current at 5 mA zener current - designed for precision biasing and voltage reference in portable battery-powered systems.
For engineers reviewing the BZX58550-B30X datasheet, BZX58550-B30X pinout, BZX58550-B30X application, or BZX58550-B30X equivalent, key selection criteria include its ultra-low test current operation, tight 2 % voltage tolerance, thermal resistance of 350 K/W on standard PCB layout, and cathode-anode polarity marking per SC-79 footprint.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals under controlled current conditions. Its specified 30 V nominal zener voltage is guaranteed at IZ = 50 µA, enabling accurate regulation in low-power analog monitoring and reference circuits.
The BZX58550-B30X exhibits a temperature coefficient of +0.05 mV/K and differential resistance of 300 Ω at 5 mA, supporting predictable voltage drift and minimal dynamic impedance in feedback paths. Its 0.9 V forward voltage at 10 mA ensures low-loss conduction when used bidirectionally or in protection configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30 V at IZ = 50 µA - enables precise low-bias voltage reference in micro-power sensor nodes |
| Tolerance | ±2 % - supports high-accuracy analog signal conditioning without post-calibration |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - defines maximum continuous thermal load in compact layouts |
| Reverse Current | 22.8 µA at VR = 29.4 V - ensures minimal leakage in standby mode of battery-critical systems |
| Differential Resistance | 300 Ω at IZ = 5 mA - determines output impedance stability under small-signal load variations |
| Forward Voltage | 0.9 V at IF = 10 mA - limits conduction loss in series protection or clamping roles |
| Package | SOD523 (SC-79), 1.2 mm × 0.8 mm × 0.6 mm - supports high-density placement in space-constrained wearables and IoT modules |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package with flat leads; body dimensions 1.2 mm × 0.8 mm × 0.6 mm; cathode identified by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar aligns with this terminal for polarity verification during placement |
| 2 | Anode (A) | Connected to ground or current-limiting resistor; forms reverse-biased junction for zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces quiescent current draw in always-on battery sensors |
| Tight voltage tolerance | ±2 % - eliminates need for trimming resistors in factory-calibrated voltage references |
| Optimized leakage profile | Intentional minor rise in IR for fast switching and noise reduction - improves transient response in ADC reference rails |
| Thermal performance | Rth(j-a) = 350 K/W with 35 mm² cathode copper - enables reliable operation up to 125 °C ambient in sealed enclosures |
| Miniaturized footprint | SOD523 package - saves >60 % board area versus SOD323 while maintaining solder joint reliability |
Applications
| Portable Battery Voltage Monitor | Low-Power Sensor Reference Rail |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth earbuds during charging cycles. IC Role / Device Role / Timing Role: Zener diode provides stable 30 V reference for comparator input against scaled battery voltage. Use Value: Enables accurate 1 % state-of-charge estimation using only passive scaling, eliminating need for dedicated voltage reference IC. |
Use Scenario: Supplying reference voltage to a 12-bit SAR ADC in a wireless environmental sensor node. IC Role / Device Role / Timing Role: Acts as precision shunt reference for ADC VREF pin, biased at 50 µA from ultra-low-leakage LDO. Use Value: Delivers <±0.6 % total error over temperature, meeting ENOB ≥ 11.5 requirement without calibration. |
| USB-C Port Overvoltage Clamp | Microcontroller Reset Circuit Bias |
Use Scenario: Protecting USB-C CC line from accidental 3.3 V rail coupling during hot-plug events. IC Role / Device Role / Timing Role: Shunt clamp activated above 30 V threshold, diverting surge current to ground before damage occurs. Use Value: Limits peak voltage to 30.6 V (max) within 100 ns, preserving ESD diode integrity and preventing false enumeration. |
Use Scenario: Generating clean reset threshold for an ARM Cortex-M0+ MCU in a smart home actuator. IC Role / Device Role / Timing Role: Provides stable 30 V reference to a precision voltage detector IC (e.g., TPS3808) that triggers reset at 2.94 V. Use Value: Ensures reset assertion remains within ±10 mV over -40 to +85 °C, preventing spurious reboots during thermal cycling. |
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 | ±5 % tolerance, higher leakage (24.4 µA), same 30 V nominal rating | Acceptable where cost sensitivity outweighs accuracy requirements | Select for non-critical biasing in consumer audio amplifiers or LED drivers |
| MMSZ5257B | 30 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot | Higher power handling but 2.25× larger footprint and 3× higher thermal resistance | Choose only when board layout allows larger package and >400 mW dissipation is required |
Compared with BZX58550-C30 and MMSZ5257B, the BZX58550-B30X delivers superior voltage accuracy and smallest PCB footprint, making it optimal for space- and precision-constrained designs where 300 mW dissipation suffices.
Availability
BZX58550-B30X is available at Aetrix Electronics and suitable for portable battery voltage monitors, low-power sensor reference rails, USB-C port overvoltage clamps, and microcontroller reset circuit bias requiring stable component supply across high-mix production runs.
Supply support for BZX58550-B30X 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 discrete and logic devices, with leadership in advanced packaging and automotive-qualified components.
The BZX58550 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for ultra-low-power voltage reference and biasing in battery-operated and space-constrained electronics.
FAQ
What is the maximum continuous reverse voltage the BZX58550-B30X can regulate without degradation?
The BZX58550-B30X is rated for nominal 30 V zener voltage at 50 µA test current, with absolute maximum reverse voltage limited to 30.6 V (max) under specified conditions. Exceeding this value risks irreversible breakdown or parametric shift, as defined in Table 8 of the datasheet where VZ max = 30.6 V at IZ = 5 mA.
How does the SOD523 package affect thermal performance compared to larger Zener packages?
In the SOD523 package, the BZX58550-B30X achieves Rth(j-a) = 350 K/W with 35 mm² cathode copper, which is 25 % lower than typical SOD-323 Zeners (≈460 K/W). This improved thermal resistance allows sustained operation at 85 °C ambient with full 300 mW dissipation, unlike larger packages constrained by interfacial resistance.
Can the BZX58550-B30X be used in series or parallel configurations for higher voltage or current capability?
No - the BZX58550-B30X is not characterized for series or parallel operation. Its ±2 % tolerance and mismatched temperature coefficients would cause uneven voltage sharing and thermal runaway in parallel, while series stacking introduces cumulative tolerance error exceeding ±4 %, violating precision reference requirements.
Is the BZX58550-B30X suitable for automotive applications?
No - the BZX58550-B30X is not automotive-qualified. The datasheet explicitly states in Section 14 that "Unless this data sheet expressly states that this specific Nexperia product is automotive qualified, the product is not suitable for automotive use." It lacks AEC-Q200 qualification and has no extended temperature or reliability validation for vehicle environments.
BZX58550-B30X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B30X FAQ
1.How can I place an order for BZX58550-B30X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B30X 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-B30X reliable?
The price and inventory of BZX58550-B30X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B30X is usually 5 days.
3.What payment methods are accepted for BZX58550-B30X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B30X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B30X?
BZX58550-B30X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B30X 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-B30X?
For technical support, including BZX58550-B30X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B30X requirements.
6.How does Aetrix verify that BZX58550-B30X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B30X 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-B30X meets industry standards.
7.What is the process for return or replacement of BZX58550-B30X?
All BZX58550-B30X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B30X, 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-B30X part is unused and in its original packaging.
Return procedure for BZX58550-B30X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B30X Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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onsemi
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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