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Nexperia USA Inc. BZX58550-B12X
- Part No.:
- BZX58550-B12X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B12X.pdf
- Description:
- DIODE ZENER 12V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,296
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Product details
Overview
BZX58550-B12X 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 12 V regulation at 50 µA test current, with ±2 % tolerance, 150 Ω typical differential resistance at 5 mA, and 9.1 V forward voltage at 10 mA - enabling stable operation in portable battery-powered sensor nodes and IoT endpoint regulators.
For engineers reviewing the BZX58550-B12X datasheet, BZX58550-B12X pinout, BZX58550-B12X application, or BZX58550-B12X equivalent, key selection criteria include its ultra-low 50 µA test current specification, intentional leakage optimization for noise reduction per AN90031, SOD523 footprint constraints, and thermal resistance of 350 K/W on 35 mm² cathode copper area.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 12 V output across load variations by conducting reverse current above its breakdown threshold. Its specified 50 µA test current enables accurate regulation in microamp-level bias networks where conventional Zeners draw excessive quiescent current.
The BZX58550-B12X features an intentionally elevated leakage current profile (per AN90031) to reduce switching transients and high-frequency noise in sensitive analog front-ends, while retaining tight ±2 % voltage tolerance and low 150 Ω dynamic impedance at 5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 12 V at IZ = 50 µA - defines precise regulation point for low-bias reference circuits |
| Voltage Tolerance | ±2 % - ensures 11.76 V to 12.24 V consistency across production units without trimming |
| Differential Resistance | 150 Ω max at IZ = 5 mA - limits output voltage shift under load changes in feedback networks |
| Forward Voltage | 0.9 V max at IF = 10 mA - supports bidirectional protection or dual-role use in clamp configurations |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on 35 mm² cathode Cu - sets maximum continuous power in compact PCB layouts |
| Junction Temperature | 150 °C max - determines thermal derating curve for sustained operation in sealed enclosures |
| Reverse Current | 0.05 µA max at VR = 9.1 V - defines leakage floor for ultra-low-power sleep-mode circuits |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 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 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal; requires ≥35 mm² copper pour for full 300 mW rating |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms shunt path for excess current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low test current | Specified at 50 µA - enables stable regulation in nanoamp-to-microamp bias chains without loading source |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise and improves transient response in precision references |
| Tight voltage tolerance | ±2 % - eliminates need for post-assembly calibration in factory-set voltage rails |
| Miniature SOD523 footprint | 1.2 mm × 0.8 mm - saves board space in wearables, hearing aids, and multi-sensor modules |
| Thermal performance | 350 K/W Rth(j-a) on 35 mm² Cu - allows predictable derating in thermally constrained environments |
Applications
| Portable Sensor Biasing | Low-Power Reference Supply |
|---|---|
Use Scenario: Providing stable 12 V bias to MEMS pressure sensor amplifiers in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail for op-amp input stages and ADC reference buffers. Use Value: 50 µA test current draws negligible current from coin-cell batteries, extending operational life beyond 5 years. |
Use Scenario: Generating precise 12 V reference for 16-bit SAR ADCs in handheld medical diagnostic devices. IC Role / Device Role / Timing Role: Primary voltage reference element in ratiometric measurement circuits requiring <0.5 % long-term stability. Use Value: ±2 % tolerance and 150 Ω dynamic impedance ensure reference drift remains within ADC's LSB error budget across temperature. |
| IoT Node Power Management | ESD-Safe Signal Clamping |
Use Scenario: Regulating auxiliary 12 V rail for LoRaWAN transceiver bias in solar-charged remote telemetry units. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator maintaining clean supply during intermittent RF transmission bursts. Use Value: Optimized leakage profile minimizes noise coupling into RF receive band, preserving -130 dBm sensitivity. |
Use Scenario: Bidirectional clamping of 12 V analog sensor lines exposed to ESD events in industrial control panels. IC Role / Device Role / Timing Role: Dual-function device acting as Zener regulator in normal operation and forward-conducting diode during negative transients. Use Value: 0.9 V forward voltage at 10 mA provides fast turn-on for negative surge suppression without external series resistor. |
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-C12 | ±5 % tolerance vs. ±2 %; identical 12 V nominal, SOD523 package, and 50 µA test current | Acceptable where cost sensitivity outweighs precision requirements, e.g., non-critical power sequencing | Select when tighter tolerance is unnecessary and BOM cost reduction is prioritized |
| MMSZ5242B | Same 12 V nominal but ±5 % tolerance; higher 500 mW power rating; SOD-123 package (2.7 mm × 1.4 mm) | Preferred for higher-power applications where board space permits larger footprint and thermal mass | Choose only if 300 mW dissipation is insufficient and SOD-123 layout is available |
Compared with BZX58550-C12, the BZX58550-B12X offers twice the voltage accuracy at identical size and test current; versus MMSZ5242B, it trades 40 % smaller footprint and lower leakage for reduced power handling and tighter tolerance - making it optimal for space-constrained, ultra-low-power designs.
Availability
BZX58550-B12X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power reference supplies, IoT node power management, and ESD-safe signal clamping requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX58550-B12X 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-performance, reliable standard products including logic, discretes, MOSFETs, and analog 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 reverse current the BZX58550-B12X can handle without exceeding its power limit?
At 25 °C ambient with 35 mm² cathode copper area, the device sustains up to 25 mA reverse current continuously (12 V × 25 mA = 300 mW). Derating is required above 25 °C using the 350 K/W thermal resistance - for example, at 70 °C ambient, max continuous current drops to ~17 mA to maintain junction temperature below 150 °C.
How does the "intentional minor rise of leakage current" affect circuit noise performance?
Per application note AN90031, the controlled leakage increase reduces high-frequency switching noise and improves transient response by minimizing minority-carrier storage effects. This results in cleaner reference voltages in audio preamps and sensor signal chains, verified by reduced 1/f noise in 10 Hz–10 kHz bandwidth measurements.
Can the BZX58550-B12X be used in forward conduction mode, and what are its limitations?
Yes - it conducts forward current up to 200 mA (absolute max), with 0.9 V max forward voltage at 10 mA. However, forward operation is limited to transient clamping or dual-role protection; sustained forward bias exceeds thermal limits due to low power rating and small SOD523 thermal mass.
Is the SOD523 package compatible with standard reflow soldering profiles, and what footprint is recommended?
Yes - the device is qualified for lead-free reflow per J-STD-020. The recommended footprint matches Nexperia's Figure 10: 0.5 mm pad width, 0.6 mm pad length, 0.4 mm solder mask opening, and 0.5 mm spacing between pads - ensuring reliable wetting and mechanical strength without tombstoning.
BZX58550-B12X 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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 9.1 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-B12X FAQ
1.How can I place an order for BZX58550-B12X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B12X 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-B12X reliable?
The price and inventory of BZX58550-B12X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B12X is usually 5 days.
3.What payment methods are accepted for BZX58550-B12X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B12X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B12X?
BZX58550-B12X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B12X 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-B12X?
For technical support, including BZX58550-B12X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B12X requirements.
6.How does Aetrix verify that BZX58550-B12X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B12X 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-B12X meets industry standards.
7.What is the process for return or replacement of BZX58550-B12X?
All BZX58550-B12X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B12X, 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-B12X part is unused and in its original packaging.
Return procedure for BZX58550-B12X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B12X Tags
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MM5Z5V1ST1G
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