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Nexperia USA Inc. BZX58550-C39X
- Part No.:
- BZX58550-C39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C39X.pdf
- Description:
- DIODE ZENER 39V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,046
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Product details
Overview
BZX58550-C39X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 39 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 350 K/W thermal resistance (junction-to-ambient, 35 mm² copper). It serves as a precision reference or bias voltage source in ultra-low-power portable electronics.
For engineers reviewing the BZX58550-C39X datasheet, BZX58550-C39X pinout, BZX58550-C39X application, or BZX58550-C39X equivalent, key selection criteria include its 39 V Zener voltage at 50 µA, low leakage optimization for noise-sensitive analog circuits, SOD523 footprint constraints, and thermal derating on FR4 PCBs with limited copper area.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-bias voltage across its cathode-anode terminals under controlled current conditions. Its specified Zener voltage of 39 V is guaranteed at IZ = 50 µA, with differential resistance ≤350 Ω at IZ = 2 mA and temperature coefficient of +0.05 mV/K.
The BZX58550-C39X belongs to the "C" tolerance series (±2 %), features intentional minor leakage current rise per AN90031 for improved switching transients and reduced noise, and exhibits 45 pF diode capacitance at 0 V reverse bias and 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.05 V to 40.95 V at IZ = 50 µA - defines precise regulation point for low-bias reference circuits |
| Tolerance | ±2 % - enables tighter system-level voltage margin control vs. ±5 % "B" series |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C with 35 mm² cathode copper - sets maximum continuous DC load capability on standard FR4 |
| Differential Resistance (rdiff) | ≤350 Ω at IZ = 2 mA - determines output impedance and load regulation error under varying current |
| Reverse Current (IR) | ≤0.05 µA at VR = 29.4 V - ensures minimal quiescent power draw in battery-critical standby modes |
| Diode Capacitance (Cd) | 45 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent layouts |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - limits forward conduction loss during transient overvoltage clamping |
Pinout & Package
Package: SOD523 (SC-79), plastic surface-mounted, 2-lead, 1.2 mm × 0.8 mm × 0.6 mm body; marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated voltage node; marking bar identifies this terminal; requires thermal copper pad for power handling |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms current path for Zener conduction during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in microampere-bias circuits without external current amplification |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient response in feedback paths |
| Ultra-small footprint | SOD523 (1.2 × 0.8 mm) - supports high-density PCB layouts in wearables and hearing aids |
| Thermal performance | Rth(j-a) = 350 K/W with 35 mm² cathode copper - allows predictable derating up to 85 °C ambient |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift-induced error in precision references over industrial temperature range |
Applications
| Portable Battery Monitoring | Low-Power Sensor Biasing |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth earbuds using a 12-bit ADC with internal reference. IC Role / Device Role / Timing Role: Provides stable 39 V reference for resistive divider scaling, enabling accurate 0–4.2 V measurement. Use Value: ±2 % tolerance and low 50 µA operating current extend battery life by >12 hours per charge vs. higher-current references. |
Use Scenario: Supplying bias current to MEMS microphone preamplifier in smart speaker standby mode. IC Role / Device Role / Timing Role: Acts as low-noise voltage clamp on amplifier supply rail to suppress RF coupling. Use Value: Optimized leakage profile reduces audible hiss by 8 dB(A); 45 pF capacitance filters GSM burst interference. |
| Wearable Health Sensor Front-End | IoT Node Power-Rail Stabilization |
|
Use Scenario: Setting reference voltage for optical heart-rate sensor analog front-end in fitness tracker. IC Role / Device Role / Timing Role: Delivers clean, low-drift 39 V reference to op-amp gain stage driving photodiode transimpedance amplifier. Use Value: +0.05 mV/K TC ensures <±0.5 % reading error across −20 °C to +70 °C operating range. |
Use Scenario: Regulating auxiliary 3.3 V rail derived from boost converter in NB-IoT module during deep-sleep cycles. IC Role / Device Role / Timing Role: Shunt regulator absorbing residual current when main LDO is disabled, preventing rail collapse. Use Value: 0.05 µA max reverse current at 29.4 V holds rail within 1 % for >30 seconds without capacitor recharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-B39 | ±5 % tolerance, higher rdiff (≤350 Ω vs. ≤350 Ω same, but looser VZ spread), no optimized leakage | Acceptable where cost sensitivity outweighs precision; unsuitable for noise-critical analog signal chains | Select only if system tolerances allow ±5 % VZ variation and EMI immunity is not required |
| MMSZ5256B-7-F | 39 V nominal, ±5 %, SOD-123 package (2.7 × 1.4 mm), Ptot = 500 mW, rdiff = 70 Ω typical | Higher power handling but 3.4× larger footprint; better regulation but incompatible with ultra-dense layouts | Choose when board space permits and >300 mW dissipation is needed; not drop-in due to package mismatch |
Compared with BZX58550-B39, the C39X offers tighter tolerance and noise-optimized leakage for precision analog; versus MMSZ5256B-7-F, it trades power headroom and lower rdiff for 65 % smaller area and lower quiescent current-critical in miniaturized battery systems.
Availability
BZX58550-C39X is available at Aetrix Electronics and suitable for portable battery monitoring, low-power sensor biasing, wearable health sensor front-ends, and IoT node power-rail stabilization requiring stable component supply with consistent SOD523 sourcing.
Supply support for BZX58550-C39X 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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for consumer, industrial, and automotive markets.
The BZX58550 series targets ultra-low-power voltage reference and regulation in space-constrained, battery-operated devices-designed specifically for applications demanding sub-100 µA operation and SC-79 footprint compliance.
FAQ
What is the maximum continuous reverse current the BZX58550-C39X can handle without exceeding its power rating?
At 25 °C ambient with 35 mm² cathode copper, the device sustains ≤7.69 mA continuous reverse current (300 mW ÷ 39 V) before reaching its 300 mW Ptot limit. Derating applies above 25 °C per Rth(j-a) = 350 K/W; at 70 °C ambient, max usable current drops to ~5.2 mA.
Can the BZX58550-C39X be used in place of a standard 39 V Zener in an existing SOD-123 design?
No-it uses SOD523 (1.2 × 0.8 mm), not SOD-123 (2.7 × 1.4 mm); pad layout, solder stencil, and reflow profile are incompatible. Mechanical fit and thermal performance differ significantly; redesign of footprint and thermal relief is mandatory.
How does the "intentional minor rise of leakage current" improve circuit performance?
Per AN90031, this controlled IR increase reduces minority-carrier storage time, accelerating turn-off during transient events and lowering high-frequency noise generation-particularly beneficial in feedback networks of DC-DC converters and precision amplifiers where ringing or instability occurs.
Is the BZX58550-C39X suitable for automotive applications?
No-this part is not AEC-Q200 qualified, lacks automotive-grade screening, and is explicitly designated for consumer and industrial use. Nexperia's legal disclaimers state non-automotive qualified products are unsuitable for safety-critical or life-support systems.
BZX58550-C39X 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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-C39X FAQ
1.How can I place an order for BZX58550-C39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C39X 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-C39X reliable?
The price and inventory of BZX58550-C39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-C39X is usually 5 days.
3.What payment methods are accepted for BZX58550-C39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C39X?
BZX58550-C39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C39X 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-C39X?
For technical support, including BZX58550-C39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C39X requirements.
6.How does Aetrix verify that BZX58550-C39X is sourced from the original manufacturer or authorized distributors?
All BZX58550-C39X 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-C39X meets industry standards.
7.What is the process for return or replacement of BZX58550-C39X?
All BZX58550-C39X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C39X, 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-C39X part is unused and in its original packaging.
Return procedure for BZX58550-C39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C39X Tags
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