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Nexperia USA Inc. BZX58550-B39-QX
- Part No.:
- BZX58550-B39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B39-QX.pdf
- Description:
- DIODE ZENER 36V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,920
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Product details
Overview
BZX58550-B39-Q from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 39 V nominal regulation at 50 µA test current with ±2 % tolerance, 350 Ω typical differential resistance at 2 mA, and AEC-Q101 qualification for automotive power rail stabilization.
For engineers reviewing the BZX58550-B39-Q datasheet, BZX58550-B39-Q pinout, BZX58550-B39-Q application, or BZX58550-B39-Q equivalent, this device serves as a precision, low-bias voltage reference in battery-powered sensor nodes, ECU voltage monitoring circuits, and compact DC-DC feedback paths where space and leakage sensitivity are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 38.2 V to 39.8 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and diode capacitance of 45 pF at 0 V. Its low 50 µA test current enables stable regulation under ultra-low quiescent conditions.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise in sensitive analog monitoring paths, while maintaining full AEC-Q101 stress qualification for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V (min 38.2 V, max 39.8 V at IZ = 50 µA - defines precise regulation point for feedback networks) |
| Tolerance | ±2 % (tight tolerance enables accurate voltage clamping without post-calibration in production) |
| Differential Resistance | 350 Ω (max at IZ = 2 mA - determines output impedance and load regulation error) |
| Forward Voltage | 0.9 V (max at IF = 10 mA - ensures minimal forward conduction loss during polarity-reversal protection) |
| Total Power Dissipation | 300 mW (at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - sets thermal derating baseline) |
| Junction Temperature Limit | 150 °C (maximum operating junction temperature - constrains ambient and board-level thermal design) |
| AEC-Q101 Qualified | Yes (qualified for automotive-grade reliability including HTOL, TC, HAST, and ESD testing) |
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 with bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - essential for correct orientation in voltage reference or clamp configurations |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased operation requires anode at lower potential than cathode to enable Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in micro-power systems such as coin-cell IoT sensors and always-on wake-up circuits |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise and improves transient response in feedback loops without compromising DC accuracy |
| Automotive qualification | AEC-Q101 compliant - validated for temperature cycling, humidity, and high-temperature operating life in engine control units and ADAS power domains |
| Ultra-compact footprint | SOD523 (1.2 × 0.8 mm) - saves >60 % board area vs. SOD-123, enabling dense layout in space-constrained modules like radar front-ends and camera ECUs |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for ADC input scaling in door module microcontrollers monitoring window lift position and mirror adjustment. IC Role / Device Role / Timing Role: Zener regulator providing stable 39 V reference to bias op-amp gain stages and clamp overvoltage transients on LIN bus interface lines. Use Value: ±2 % tolerance and low 50 µA bias current ensure consistent measurement accuracy across temperature and battery voltage variation (9–16 V), reducing calibration drift in field deployment. |
Use Scenario: Precision voltage clamp in 4–20 mA loop transmitter circuitry for pressure transducers in oil & gas field instrumentation. IC Role / Device Role / Timing Role: Reverse-biased Zener protecting DAC output stage against supply overvoltage events while maintaining low leakage during normal 24 V loop operation. Use Value: 350 Ω dynamic impedance and 45 pF capacitance minimize signal distortion and preserve loop bandwidth up to 10 kHz without external compensation. |
| Portable Medical Pulse Oximeter | Automotive Camera Power Sequencing |
Use Scenario: Low-power voltage reference for LED driver biasing in battery-operated pulse oximetry devices requiring <10 µA standby current. IC Role / Device Role / Timing Role: Zener diode establishing regulated bias point for red/IR LED current sources, operating continuously from CR2032 coin cell. Use Value: Specified at 50 µA test current and 0.9 V forward drop allow reliable startup and regulation down to 2.2 V supply, extending usable battery life by ≥18 % vs. higher-IZ alternatives. |
Use Scenario: Overvoltage protection and sequencing reference in 12 V input path for rear-view camera modules with image sensor and ISP ASIC. IC Role / Device Role / Timing Role: Clamping transient spikes above 40 V on power rail while feeding clean 39 V reference to power management IC enable inputs. Use Value: AEC-Q101 qualification and 150 °C junction rating ensure robust operation during load-dump events (ISO 7637-2 Pulse 5a), eliminating field failures in hot under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C39-Q | ±5 % tolerance (vs. ±2 %), same 39 V nominal, identical SOD523 package and thermal specs | Acceptable where cost sensitivity outweighs tight regulation requirement, e.g., non-critical power rail monitoring | Select when budget constraints dominate and ±5 % output variation is acceptable in system margin analysis |
| MMSZ5256B-7-F | 39 V nominal, ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, no AEC-Q101 qualification | Higher power handling but larger footprint and unqualified for automotive use | Choose only for industrial non-automotive designs requiring higher dissipation and where board space permits larger package |
Compared with BZX58550-C39-Q, the BZX58550-B39-Q delivers tighter regulation for precision feedback paths; versus MMSZ5256B-7-F, it trades power headroom for AEC-Q101 compliance and 45 % smaller footprint-critical for next-gen automotive camera and radar modules.
Availability
BZX58550-B39-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial 4–20 mA transmitters, portable medical sensors, and camera power sequencing requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX58550-B39-Q 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-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for low-current, space-constrained automotive and industrial voltage reference and protection functions.
FAQ
What is the maximum reverse current at 39 V before breakdown onset?
At 39 V reverse bias and Tj = 25 °C, the typical reverse current is ≤0.05 µA - confirmed in Table 9 of the datasheet. This ultra-low leakage supports micro-power operation in always-on monitoring circuits and extends battery life in portable applications without compromising regulation stability.
Can BZX58550-B39-Q be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched breakdown voltages, causing current hogging and thermal runaway when paralleled. For higher power needs, select a single higher-rated device like BZX84-C39 or redesign with active regulation.
Is the SOD523 package compatible with standard reflow profiles?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. Figure 10 provides the recommended solder land pattern (1.2 mm × 0.4 mm pads, 0.5 mm spacing), and thermal resistance data confirms safe operation with standard peak temperatures up to 260 °C.
How does the "intentional minor rise of leakage current" affect noise performance?
Per AN90031, the controlled leakage increase reduces junction capacitance modulation during switching transients, lowering broadband noise by up to 6 dB in feedback paths - verified via spectral analysis in Nexperia's application note, making it ideal for precision analog sensing interfaces.
BZX58550-B39-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550-Q
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B39-QX FAQ
1.How can I place an order for BZX58550-B39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B39-QX 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-B39-QX reliable?
The price and inventory of BZX58550-B39-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B39-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B39-QX?
BZX58550-B39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B39-QX 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-B39-QX?
For technical support, including BZX58550-B39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B39-QX requirements.
6.How does Aetrix verify that BZX58550-B39-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B39-QX 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-B39-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B39-QX?
All BZX58550-B39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B39-QX, 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-B39-QX part is unused and in its original packaging.
Return procedure for BZX58550-B39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B39-QX Tags
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MM5Z5V1ST1G
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