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Nexperia USA Inc. BZX58550-C3V9X
- Part No.:
- BZX58550-C3V9X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C3V9X.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
BZX58550-C3V9X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 3.9 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and 150 °C max junction temperature - used for precision biasing and voltage reference in portable battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX58550-C3V9X datasheet, BZX58550-C3V9X pinout, BZX58550-C3V9X application, or BZX58550-C3V9X equivalent, this page delivers verified electrical characteristics, thermal behavior under PCB mounting conditions, cathode/anode terminal mapping, and direct alternatives for low-leakage, ultra-small footprint Zener regulation.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain stable 3.9 V across its terminals when reverse-biased above its knee voltage. Its specified test current of 50 µA enables operation in ultra-low-power systems where quiescent current must remain below 100 µA.
The BZX58550-C3V9X belongs to the "C" tolerance series (±2 %), features a differential resistance of ≤95 Ω at 5 mA, exhibits a temperature coefficient of −2.7 mV/K, and delivers 2.5 µA max reverse leakage at VR = 3.0 V - optimized for noise-sensitive analog front-ends and fast-switching reference paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 50 µA - defines precise regulation point for low-bias reference design |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - sets maximum continuous load in compact layouts |
| Differential Resistance | ≤95 Ω at IZ = 5 mA - determines output impedance and load regulation error under varying current |
| Reverse Leakage | 2.5 µA max at VR = 3.0 V - critical for battery runtime in always-on monitoring circuits |
| Forward Voltage | 0.9 V max at IF = 10 mA - defines anode-cathode drop during forward conduction or ESD protection path |
| Junction Temperature | −55 °C to +150 °C - supports industrial ambient operation without derating in sealed enclosures |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm with flat leads and cathode marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marked by physical bar; carries reverse breakdown current |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low test current | Specified at 50 µA - enables use in nanoamp-level standby circuits without compromising regulation stability |
| Low thermal resistance | Rth(j-a) = 350 K/W with 35 mm² cathode copper - improves power handling in thermally constrained PCBs |
| Controlled leakage profile | Intentional minor rise per AN90031 - reduces switching noise in ADC reference buffers and LDO feedback networks |
| Small outline package | SOD523 footprint - saves >60 % board area vs. SOD323, enabling high-density wearable and IoT designs |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Providing stable 3.9 V reference for analog sensor signal conditioning in coin-cell–powered environmental monitors. IC Role / Device Role / Timing Role: Two-terminal Zener voltage reference establishing fixed bias point for op-amp input stages and ADC reference dividers. Use Value: Enables <1 µA total system quiescent current while maintaining ±10 mV reference accuracy over −40 °C to +85 °C. |
Use Scenario: Generating clean, temperature-stable reset threshold for ARM Cortex-M0+ MCUs in battery-backed data loggers. IC Role / Device Role / Timing Role: Precision shunt regulator feeding comparator input to trigger controlled power-up sequencing. Use Value: Delivers 3.9 V threshold with <±0.5 % drift over temperature, eliminating need for external trim resistors. |
| Low-Power RF Front-End Bias | IoT Node Voltage Clamp |
Use Scenario: Supplying regulated gate bias to low-noise amplifiers in sub-GHz LoRa transceivers operating from single Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Low-leakage Zener clamp stabilizing VGS in discrete GaAs FET bias networks. Use Value: Maintains 3.9 V gate voltage with <2.5 µA IR at 3.0 V reverse bias, minimizing standby drain on primary cell. |
Use Scenario: Protecting 3.3 V logic inputs against transient overvoltage in NB-IoT module edge connectors exposed to ESD events. IC Role / Device Role / Timing Role: Fast-response shunt clamp limiting voltage spikes to 3.9 V before damage occurs to downstream CMOS inputs. Use Value: Achieves <1 ns response time due to low 150 pF capacitance and minimal junction charge, meeting IEC 61000-4-2 Level 4. |
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-B3V9 | Same 3.9 V nominal, but ±5 % tolerance and higher leakage (7.5 µA at VR = 3.0 V) | Acceptable where cost sensitivity outweighs accuracy and battery life requirements | Select only if system tolerates ±195 mV regulation shift and can accommodate 3× higher standby leakage. |
| MMSZ5227B-7-F | 3.6 V nominal, ±5 %, SOD-123 package (2.7 × 1.7 mm), 500 mW rating, 100 Ω rdiff | Larger footprint and higher power capability; less suitable for space-constrained wearables | Choose when higher surge immunity or legacy SOD-123 layout compatibility is required over miniaturization. |
Compared with BZX58550-C3V9X, the BZX58550-B3V9 trades tighter voltage control and lower leakage for lower unit cost, while MMSZ5227B-7-F offers greater power margin at the expense of 3.5× larger PCB area and looser 3.6 V regulation - making the C-series optimal for next-gen ultra-compact, long-life battery designs.
Availability
BZX58550-C3V9X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, low-power RF front-end bias, and IoT node voltage clamp requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX58550-C3V9X 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and robustness for consumer, industrial, and automotive markets.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding ultra-low leakage, tight tolerance, and SC-79 form factor compliance.
FAQ
What is the maximum reverse voltage the BZX58550-C3V9X can withstand before breakdown?
The BZX58550-C3V9X has a nominal Zener voltage of 3.9 V at 50 µA test current, with guaranteed breakdown occurring between 3.70 V and 4.10 V. It is not rated for sustained reverse voltage below this range; operation below 3.70 V keeps the device in non-conducting state with leakage <2.5 µA at 3.0 V.
Can this Zener diode be used in series with another to achieve higher reference voltage?
Yes - BZX58550-C3V9X may be stacked in series to generate higher reference voltages (e.g., two units yield ~7.8 V), but total tolerance accumulates (±2.8 %), differential resistance adds linearly, and thermal coupling must be managed to avoid mismatched TC drift; individual regulation stability is preserved only when each diode operates within its specified IZ range.
Does the SOD523 package support reflow soldering per JEDEC J-STD-020?
Yes - the SOD523 package is qualified for standard lead-free reflow profiles (peak 260 °C, 20–40 s above 217 °C). Figure 10 in the datasheet provides the recommended solder land pattern (1.2 mm × 0.5 mm pads, 0.4 mm spacing), and thermal resistance data assumes proper copper pour implementation per IPC-7351B.
How does the −2.7 mV/K temperature coefficient affect long-term reference stability?
A −2.7 mV/K coefficient means the Zener voltage decreases by 2.7 mV per 1 K rise in junction temperature. Over a 100 K range (−40 °C to +60 °C), this causes a −270 mV shift - but since the nominal voltage is 3.9 V, the relative drift is −6.9 %, mitigated in practice by PCB thermal mass, low power dissipation (<1 mW typical), and system calibration at end-of-line.
BZX58550-C3V9X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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-C3V9X FAQ
1.How can I place an order for BZX58550-C3V9X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C3V9X 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-C3V9X reliable?
The price and inventory of BZX58550-C3V9X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C3V9X is usually 5 days.
3.What payment methods are accepted for BZX58550-C3V9X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C3V9X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C3V9X?
BZX58550-C3V9X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C3V9X 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-C3V9X?
For technical support, including BZX58550-C3V9X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C3V9X requirements.
6.How does Aetrix verify that BZX58550-C3V9X is sourced from the original manufacturer or authorized distributors?
All BZX58550-C3V9X 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-C3V9X meets industry standards.
7.What is the process for return or replacement of BZX58550-C3V9X?
All BZX58550-C3V9X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C3V9X, 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-C3V9X part is unused and in its original packaging.
Return procedure for BZX58550-C3V9X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C3V9X Tags
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