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Nexperia USA Inc. BZX58550-B39X
- Part No.:
- BZX58550-B39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B39X.pdf
- Description:
- DIODE ZENER 39V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,817
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Product details
Overview
BZX58550-B39X 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 39 V regulation at 50 µA test current, with ±2 % tolerance, 350 Ω differential resistance at 2 mA, and 0.05 µA reverse leakage at rated voltage - ideal for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX58550-B39X datasheet, BZX58550-B39X pinout, BZX58550-B39X application, or BZX58550-B39X equivalent, key selection criteria include its 39 V nominal Zener voltage, ultra-low 50 µA test current, SOD523 footprint compatibility, thermal resistance of 350 K/W on 35 mm² copper, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents by conducting reverse-biased Zener breakdown. Its specified regulation at 50 µA enables operation in microampere-bias circuits where traditional Zeners fail to activate.
The BZX58550-B39X belongs to the "B" tolerance series (±2 %), features a temperature coefficient of +33.4 mV/K, exhibits 41.2 pF junction capacitance at 0 V, and supports up to 200 mA forward surge current - all within a 1.2 mm × 0.8 mm × 0.6 mm SOD523 body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal at IZ = 50 µA; tight ±2 % tolerance ensures predictable reference accuracy in low-current bias networks |
| Differential Resistance (rdiff) | 350 Ω max at IZ = 2 mA; defines voltage regulation stiffness under small-signal load variations |
| Reverse Leakage (IR) | 0.05 µA max at VR = 39 V; enables ultra-low quiescent power in always-on monitoring circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; supports use as low-drop rectifier or clamp in signal conditioning paths |
| Total Power Dissipation (Ptot) | 300 mW max at Tamb ≤ 25 °C on 35 mm² cathode copper; constrains continuous regulation current to ~7.7 mA at 39 V |
| Junction-to-Ambient Rth | 350 K/W on FR4 PCB with 35 mm² cathode Cu area; determines thermal rise under sustained dissipation |
| Package | SOD523 (SC-79); 1.2 mm × 0.8 mm × 0.6 mm footprint enables high-density placement in space-constrained wearables and IoT modules |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package with 2 leads; cathode identified by marking bar on body; dimensions: 1.25 mm (L) × 0.85 mm (W) × 0.65 mm (H) max; 0.34 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar on package identifies this terminal; carries reverse breakdown current during regulation |
| 2 | Anode (A) | Connected to circuit ground or lower-potential rail; completes Zener conduction path; polarity must be observed to avoid forward conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables stable reference generation in nanoampere-bias circuits where supply current is strictly constrained |
| Tight voltage tolerance | ±2 % (B-series) - reduces calibration overhead in precision ADC references and sensor excitation circuits |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - suppresses switching noise and improves transient response in RF bias networks |
| Ultra-small footprint | SOD523 package - saves >60 % board area vs. SOD323, critical for miniaturized medical patches and hearing aid PCBs |
| Thermal performance | 350 K/W Rth(j-a) on 35 mm² Cu - allows 39 V regulation at ~7.7 mA without forced cooling in ambient-temperature industrial sensors |
Applications
| Portable Gas Sensor Biasing | IoT Node Reference Voltage |
|---|---|
Use Scenario: Providing stable 39 V bias to electrochemical gas sensor electrodes in battery-powered air quality monitors. IC Role / Device Role / Timing Role: Shunt voltage reference regulating sensor excitation voltage independent of battery discharge curve. Use Value: Enables <1 µA standby current while maintaining ±0.8 V regulation accuracy over 2–3.6 V input range, extending battery life to 18+ months. |
Use Scenario: Generating precise reference for 16-bit SAR ADC in NB-IoT endpoint measuring soil moisture and pH. IC Role / Device Role / Timing Role: Low-noise Zener reference source for ADC VREF, decoupled from noisy digital supply rails. Use Value: 350 Ω rdiff and 41.2 pF capacitance minimize code spread and improve ENOB by 0.7 bits versus standard 1N4739A. |
| Wearable ECG Front-End Clamping | Industrial Loop-Powered Transmitter |
Use Scenario: Protecting instrumentation amplifier inputs from overvoltage transients in dry-electrode ECG patches. IC Role / Device Role / Timing Role: Fast-response Zener clamp limiting common-mode swing to ±39 V during ESD events. Use Value: 0.05 µA leakage avoids DC offset drift in high-Z biopotential paths; 300 mW Ptot handles 1 kV HBM surges without degradation. |
Use Scenario: Stabilizing 39 V auxiliary rail for op-amp signal conditioning in 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Passive voltage regulator maintaining constant headroom for analog circuitry across 12–42 V loop compliance range. Use Value: ±2 % tolerance eliminates need for post-calibration trimming; SOD523 footprint allows dual-device redundancy in safety-critical SIL-2 designs. |
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-C39 | ±5 % tolerance (vs. ±2 %), identical VZ = 39 V nominal, same SOD523 package and thermal specs | Acceptable where calibration is performed in-system; higher leakage variation impacts low-power sleep modes | Select when cost sensitivity outweighs reference stability requirements in non-precision consumer devices |
| MMSZ5267B-7-F | 39 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Ptot, 1000 Ω rdiff at 20 mA | Higher power handling but larger footprint and poorer regulation stiffness; requires ≥20 mA test current | Choose only if board layout permits larger package and application demands >10 mA regulation current |
Compared with BZX58550-C39 and MMSZ5267B-7-F, the BZX58550-B39X uniquely combines ±2 % tolerance, 50 µA test current capability, and SOD523 size - making it the sole option for space-constrained, battery-operated systems requiring high initial accuracy without active trimming.
Availability
BZX58550-B39X is available at Aetrix Electronics and suitable for portable medical sensors, IoT data loggers, and industrial loop-powered transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B39X 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 headquartered in Nijmegen, Netherlands, specializing in high-performance, energy-efficient logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in battery-operated and space-constrained electronics.
FAQ
What is the maximum continuous Zener current for BZX58550-B39X at 25 °C ambient?
The device supports up to 7.7 mA continuous Zener current at 25 °C ambient when mounted on an FR4 PCB with 35 mm² copper at the cathode tab, calculated from its 300 mW total power dissipation rating and 39 V nominal Zener voltage (300 mW ÷ 39 V ≈ 7.7 mA). Derating is required above 25 °C per the 350 K/W thermal resistance specification.
Does BZX58550-B39X support reverse-voltage protection in series configuration?
No - BZX58550-B39X is a two-terminal shunt regulator and cannot function as a series reverse-polarity protector. In forward bias, it conducts like a standard diode with 0.9 V drop at 10 mA; in reverse, it regulates at 39 V only when current exceeds the knee point (~5 µA). For reverse-voltage protection, a dedicated series MOSFET or dedicated protection IC is required.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per Nexperia application note AN90031, the controlled leakage increase in B-series devices reduces junction capacitance modulation during fast transients, suppressing high-frequency noise coupling into sensitive analog nodes - particularly beneficial in RF bias chains and precision sensor excitation where conventional Zeners induce measurable 1/f noise spikes.
Can BZX58550-B39X replace BZX55-C39 in existing designs?
Direct replacement is not recommended due to package and electrical differences: BZX55-C39 uses DO-35 glass package (5.2 mm × 2.1 mm) versus SOD523 (1.2 mm × 0.8 mm), has ±5 % tolerance, higher rdiff (~700 Ω), and requires 5 mA test current. Layout redesign and validation of thermal performance and regulation stiffness are mandatory before substitution.
BZX58550-B39X 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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 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-B39X FAQ
1.How can I place an order for BZX58550-B39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B39X 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-B39X reliable?
The price and inventory of BZX58550-B39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B39X is usually 5 days.
3.What payment methods are accepted for BZX58550-B39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B39X?
BZX58550-B39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B39X 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-B39X?
For technical support, including BZX58550-B39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B39X requirements.
6.How does Aetrix verify that BZX58550-B39X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B39X 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-B39X meets industry standards.
7.What is the process for return or replacement of BZX58550-B39X?
All BZX58550-B39X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B39X, 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-B39X part is unused and in its original packaging.
Return procedure for BZX58550-B39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B39X Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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