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Nexperia USA Inc. BZX58550-C30X
- Part No.:
- BZX58550-C30X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C30X.pdf
- Description:
- DIODE ZENER 30V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,466
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Product details
Overview
BZX58550-C30X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 30 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 22.8 µA reverse current at 24.4 V reverse voltage - ideal for portable battery-powered sensor nodes and IoT endpoint voltage stabilization.
For engineers reviewing the BZX58550-C30X datasheet, BZX58550-C30X pinout, BZX58550-C30X application, or BZX58550-C30X equivalent, key selection criteria include its low 50 µA regulation current, 30 V nominal Zener voltage with tight ±2 % tolerance, differential resistance of 300 Ω at 5 mA, and thermal resistance of 350 K/W on standard FR4 PCB - critical for compact, thermally constrained designs.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener breakdown threshold. Its 30 V nominal working voltage is characterized at IZ = 50 µA, enabling accurate low-bias referencing without significant quiescent draw.
The BZX58550-C30X features intentional leakage optimization per AN90031, supporting fast switching transients and reduced noise in signal conditioning paths. Its SOD523 package provides minimal footprint (1.2 mm × 0.8 mm) and low thermal resistance (350 K/W to ambient), ensuring reliable operation under sustained 300 mW dissipation at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V to 31.5 V at IZ = 50 µA - defines precise regulation window for low-current reference stability |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance (rdiff) | 300 Ω max at IZ = 5 mA - determines regulation stiffness against load current changes |
| Reverse Current (IR) | 0.05 µA max at VR = 24.4 V - enables ultra-low standby leakage in battery-critical systems |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode copper - sets thermal design boundary for PCB layout |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - limits forward conduction loss during transient overvoltage clamping |
| Junction Temperature (Tj) | 150 °C max - defines absolute thermal limit for reliability under surge conditions |
Pinout & Package
SOD523 (SC-79) plastic surface-mount package: 2-pin, ultra-small outline (1.2 mm × 0.8 mm × 0.6 mm body), flat lead, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - reverse-biased during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail - completes shunt path for excess current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables stable reference generation in microamp-level supply rails |
| Tight voltage tolerance | ±2 % - reduces need for external trimming in precision analog front-ends |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves transient response and lowers broadband noise |
| Ultra-compact SMD package | SOD523 footprint (1.2 mm × 0.8 mm) - saves board space in wearables and miniaturized sensors |
| Thermally efficient layout | 350 K/W Rth(j-a) with 35 mm² cathode copper - supports continuous 300 mW operation without heatsinking |
Applications
| Portable Sensor Biasing | IoT Node Voltage Reference |
|---|---|
Use Scenario: Providing stable 30 V bias to MEMS pressure sensor amplifier in coin-cell-powered environmental monitor. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing fixed reference potential for analog signal chain. Use Value: Enables 50 µA regulation current to minimize battery drain while maintaining ±2 % accuracy across −40 °C to +85 °C. |
Use Scenario: Generating clean 30 V reference for ADC input scaling in NB-IoT asset tracker with Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: Precision Zener reference source for 16-bit SAR ADC full-scale calibration. Use Value: Delivers 300 Ω differential resistance and 0.05 µA leakage at 24.4 V, ensuring <0.01 % reference drift under load variation. |
| Low-Power Signal Clamping | Microcontroller Reset Supervision |
Use Scenario: Protecting 3.3 V GPIO line from ESD-induced overvoltage using series resistor + BZX58550-C30X clamp to 30 V rail. IC Role / Device Role / Timing Role: Fast-switching Zener clamp absorbing transient energy above 30 V threshold. Use Value: Optimized leakage profile per AN90031 reduces capacitive loading and improves clamping speed versus standard Zeners. |
Use Scenario: Monitoring 30 V auxiliary supply rail to assert reset signal when voltage drops below 28.5 V in industrial controller. IC Role / Device Role / Timing Role: Threshold detection element in discrete reset circuit with comparator input. Use Value: ±2 % tolerance ensures predictable 28.5–31.5 V trip window; 300 mW rating sustains brief brown-out events without failure. |
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-B30 | Same 30 V nominal voltage but ±5 % tolerance (vs. ±2 % for C30X) | Acceptable where cost sensitivity outweighs precision requirement | Select B30 only if system-level calibration compensates for wider voltage spread |
| MMSZ5257ET1G | 30 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot | Higher power handling but 3× larger footprint; higher leakage (100 nA @ 24 V) | Choose only when thermal margin exceeds 300 mW or legacy SOD-123 layout exists |
Compared with BZX58550-B30 and MMSZ5257ET1G, the BZX58550-C30X uniquely combines ±2 % tolerance, SOD523 miniaturization, and 50 µA regulation current - making it optimal for space-constrained, battery-sensitive designs requiring high initial accuracy without calibration.
Availability
BZX58550-C30X is available at Aetrix Electronics and suitable for portable sensor biasing, IoT node voltage reference, low-power signal clamping, and microcontroller reset supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-C30X 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 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 power dissipation for BZX58550-C30X?
The BZX58550-C30X has a maximum total power dissipation of 300 mW when mounted on an FR4 PCB with approximately 35 mm² copper area at the cathode tab and ambient temperature ≤ 25 °C. Derating is required above 25 °C per the 350 K/W thermal resistance specification.
How does the ±2 % tolerance affect circuit accuracy?
The ±2 % tolerance means the actual Zener voltage falls between 28.5 V and 31.5 V at 50 µA test current. This directly defines the worst-case reference error in precision analog circuits - for example, a 30 V reference used in a 16-bit ADC full-scale calibration introduces up to ±13 LSB error before trimming.
Can BZX58550-C30X be used in reverse-bias transient suppression?
Yes - its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses, making it suitable for clamping short-duration ESD or inductive spikes. However, its 300 mW steady-state limit requires series current limiting to avoid thermal runaway during sustained overvoltage.
What is the significance of the 'C' prefix in BZX58550-C30X?
The 'C' denotes the tighter ±2 % voltage tolerance grade, distinguishing it from the 'B' grade (±5 %). This is confirmed in Table 8 of the datasheet, where BZX58550-C30 specifies VZ = 28.5 V to 31.5 V at IZ = 50 µA, versus B30's 27.0 V to 33.0 V range.
BZX58550-C30X 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-C30X FAQ
1.How can I place an order for BZX58550-C30X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C30X 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-C30X reliable?
The price and inventory of BZX58550-C30X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C30X is usually 5 days.
3.What payment methods are accepted for BZX58550-C30X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C30X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C30X?
BZX58550-C30X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C30X 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-C30X?
For technical support, including BZX58550-C30X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C30X requirements.
6.How does Aetrix verify that BZX58550-C30X is sourced from the original manufacturer or authorized distributors?
All BZX58550-C30X 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-C30X meets industry standards.
7.What is the process for return or replacement of BZX58550-C30X?
All BZX58550-C30X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C30X, 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-C30X part is unused and in its original packaging.
Return procedure for BZX58550-C30X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C30X Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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