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Nexperia USA Inc. BZX58550-B3V9-QX
- Part No.:
- BZX58550-B3V9-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B3V9-QX.pdf
- Description:
- DIODE ZENER 3.9V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,850
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Product details
Overview
BZX58550-B3V9-Q 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 total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-B3V9-Q datasheet, BZX58550-B3V9-Q pinout, BZX58550-B3V9-Q application, or BZX58550-B3V9-Q equivalent, this device serves as a precision low-bias voltage reference in portable battery-powered systems, ECU sensor interfaces, and automotive infotainment power rails where space-constrained SMD regulation is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.82 V to 3.98 V at IZ = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance ≤ 600 Ω at IZ = 50 µA. Its low leakage (≤ 2.0 µA at VR = 3.0 V) supports stable biasing in ultra-low-power circuits.
Designed for surface-mount assembly on FR4 PCBs with ≥35 mm² copper area at the cathode tab, it achieves a thermal resistance of 350 K/W (junction-to-ambient), enabling reliable operation up to 150 °C junction temperature under defined mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V (range 3.82–3.98 V at 50 µA); enables precise low-current reference for 3.3 V/5 V rail monitoring |
| Tolerance | ±2 % (B-series); ensures tight voltage accuracy without post-production trimming |
| Test Current | 50 µA; allows stable regulation in battery-backed circuits drawing sub-100 µA quiescent current |
| Max Power Dissipation | 300 mW at Tamb ≤ 25 °C with 35 mm² cathode copper; supports continuous operation in compact automotive modules |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA; minimizes forward conduction loss during transient overvoltage clamping |
| Junction Temperature | −55 °C to +150 °C; qualified for under-hood automotive environments per AEC-Q101 |
| Package | SOD523 (SC-79); 1.2 × 0.8 × 0.6 mm footprint ideal for space-limited PCB layouts |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead plastic package with cathode-marked top-side band; 2-terminal surface-mount construction optimized for high-density automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Low test current operation | Stable 3.9 V regulation at 50 µA enables use in always-on battery monitoring circuits |
| Optimized leakage profile | Controlled IR ≤ 2.0 µA at VR = 3.0 V reduces standby power loss in sensor signal conditioning |
| Ultra-compact SOD523 package | 0.96 mm² board area saves >60 % space vs. SOT23 alternatives in ECU and ADAS modules |
| Thermal performance | 350 K/W Rth(j-a) with 35 mm² cathode copper enables 150 °C operation in confined enclosures |
Applications
| Automotive ECU Voltage Reference | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Providing stable 3.9 V reference for analog front-end amplifiers in engine control unit (ECU) oxygen sensor interfaces. IC Role / Device Role / Timing Role: Zener regulator supplying precision bias to op-amp input stages and ADC reference dividers. Use Value: ±2 % tolerance and −2.7 mV/K TC ensure <±15 mV drift across −40 °C to +125 °C ambient, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Generating low-noise bias voltage for wearable pulse oximeter photodiode transimpedance amplifiers. IC Role / Device Role / Timing Role: Low-current Zener shunt regulating supply to analog signal chain in coin-cell powered devices. Use Value: 50 µA test current and ≤2.0 µA leakage minimize battery drain, extending operational life beyond 12 months on CR2032. |
| Industrial IoT Node Power Rail Clamp | Consumer Audio DAC Reference |
Use Scenario: Clamping and stabilizing 3.3 V LDO output in wireless sensor nodes exposed to ESD transients. IC Role / Device Role / Timing Role: Reverse-biased Zener absorbing surge energy while maintaining regulated voltage during fast transients. Use Value: 40 W non-repetitive peak power rating (100 µs) and 300 mW continuous dissipation protect downstream RF ICs without external TVS stacking. |
Use Scenario: Supplying clean reference voltage to stereo DACs in Bluetooth headphones with shared 3.7 V Li-ion supply. IC Role / Device Role / Timing Role: Low-noise shunt regulator filtering supply ripple before DAC internal reference buffer. Use Value: Differential resistance ≤600 Ω at 50 µA and Cd = 150 pF suppress high-frequency noise above 1 MHz, improving THD+N by >3 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C3V9-Q | ±5 % tolerance (vs. ±2 %), higher leakage (≤2.5 µA), same VZ range and package | Acceptable where cost sensitivity outweighs precision; not recommended for ASIL-B ECU references | Select when tighter tolerance is unnecessary and BOM cost reduction is prioritized |
| MMSZ4685T1G | 3.9 V ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, no AEC-Q101 qualification | Larger footprint; suitable for industrial non-automotive designs requiring higher power margin | Choose only for non-automotive applications where board space and qualification are secondary |
Compared with BZX58550-C3V9-Q, the BZX58550-B3V9-Q delivers tighter voltage accuracy critical for automotive sensor biasing; versus MMSZ4685T1G, it offers AEC-Q101 compliance and 35 % smaller footprint but lower power headroom-making it optimal for space-constrained, safety-rated automotive modules.
Availability
BZX58550-B3V9-Q is available at Aetrix Electronics and suitable for automotive ECUs, portable medical sensors, industrial IoT nodes, and consumer audio DAC references requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX58550-B3V9-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-precision voltage regulation in space-constrained automotive electronics and battery-powered systems.
FAQ
What is the maximum reverse current at 3.0 V for BZX58550-B3V9-Q?
The maximum reverse current (IR) is 2.0 µA at VR = 3.0 V and Tj = 25 °C, as specified in Table 8 of the datasheet. This low leakage ensures minimal standby power draw in always-on circuits such as automotive wake-up monitors or battery fuel gauges.
Can BZX58550-B3V9-Q be used in place of a 3.3 V Zener diode?
No-it is rated for 3.9 V nominal Zener voltage (3.82–3.98 V range). Using it as a 3.3 V reference would result in insufficient conduction and unstable regulation. For 3.3 V applications, consider BZX58550-B3V3-Q (3.3 V, ±2 %) instead.
Is the SOD523 package compatible with standard reflow profiles?
Yes-the device is qualified for lead-free reflow soldering per J-STD-020. Figure 10 provides the recommended solder land pattern (1.4 mm × 0.5 mm pads, 0.4 mm spacing), and thermal characteristics assume proper copper pour at the cathode pad for heat dissipation.
Does BZX58550-B3V9-Q support bidirectional ESD protection?
No-it is a unidirectional Zener diode configured for reverse-bias regulation only. Its forward voltage is 0.9 V, and it lacks symmetric clamping capability. For bidirectional ESD protection, a dedicated TVS diode such as PESD5V0S1BA should be used.
BZX58550-B3V9-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):
- 3.9 V
- Tolerance:
- ±2%
- Power - Max:
- 270 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B3V9-QX FAQ
1.How can I place an order for BZX58550-B3V9-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B3V9-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-B3V9-QX reliable?
The price and inventory of BZX58550-B3V9-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-B3V9-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B3V9-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B3V9-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B3V9-QX?
BZX58550-B3V9-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B3V9-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-B3V9-QX?
For technical support, including BZX58550-B3V9-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B3V9-QX requirements.
6.How does Aetrix verify that BZX58550-B3V9-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B3V9-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-B3V9-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B3V9-QX?
All BZX58550-B3V9-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B3V9-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-B3V9-QX part is unused and in its original packaging.
Return procedure for BZX58550-B3V9-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B3V9-QX Tags
-
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
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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