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Nexperia USA Inc. BZX58550-B11-QX
- Part No.:
- BZX58550-B11-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B11-QX.pdf
- Description:
- DIODE ZENER 11V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
BZX58550-B11-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in space-constrained automotive and portable electronics. It delivers a nominal 11 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the BZX58550-B11-QX datasheet, BZX58550-B11-QX pinout, BZX58550-B11-QX application, or BZX58550-B11-QX equivalent, key selection criteria include its low-leakage optimized switching behavior, thermal resistance of 350 K/W on 35 mm² copper, and cathode-anode polarity marking per SC-79 footprint.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 10.8 V to 11.2 V at IZ = 50 µA, exhibiting a temperature coefficient of +5.4 mV/K and differential resistance ≤150 Ω at 5 mA. Its intentional minor leakage rise improves transient response and noise suppression in low-power analog rails.
Qualified to AEC-Q101, it supports junction temperatures up to 150 °C and features a non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), while maintaining stable regulation under ambient conditions from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 11 V (min 10.8 V, max 11.2 V at 50 µA - sets precise reference point for low-bias circuits) |
| Tolerance | ±2 % (tight regulation window enables accurate voltage clamping in sensor signal conditioning) |
| Power Dissipation | 300 mW (max at Tamb ≤ 25 °C on 35 mm² Cu - defines safe continuous operating envelope) |
| Forward Voltage | 0.9 V max at 10 mA (low forward drop minimizes conduction loss during polarity-check or ESD paths) |
| Reverse Current | ≤0.05 µA at VR = 8.4 V (ultra-low leakage preserves battery life in always-on monitoring nodes) |
| Thermal Resistance | 350 K/W (junction-to-ambient on 35 mm² cathode copper - critical for thermal derating in sealed enclosures) |
| Capacitance | 85 pF at 0 V, 1 MHz (low parasitic capacitance avoids signal integrity degradation in high-frequency feedback loops) |
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 by 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 automated placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased operation requires anode at lower voltage than cathode |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables stable reference generation in micro-power systems (e.g., coin-cell IoT sensors) |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient recovery in LDO feedback networks |
| AEC-Q101 qualification | Stress-tested for automotive discrete semiconductors - validated for engine control, body electronics, and ADAS power domains |
| Ultra-compact footprint | SOD523 (1.2 × 0.8 mm) - saves PCB area in multi-rail PMIC supervision and compact battery management modules |
| Thermal performance | 350 K/W Rth(j-a) on 35 mm² Cu - allows higher power margin in thermally constrained automotive modules without heatsinking |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Voltage reference for MEMS pressure and humidity sensors in HVAC control units. IC Role / Device Role / Timing Role: Zener regulator providing stable 11 V bias to analog front-end op-amps and ADC references. Use Value: ±2 % tolerance and +5.4 mV/K TC ensure <±10 mV drift over −40 °C to +125 °C, meeting ASIL-B calibration stability requirements. |
Use Scenario: Low-power voltage clamp in wearable ECG signal chain power rails. IC Role / Device Role / Timing Role: Reverse-biased Zener protecting instrumentation amplifier inputs from ESD and overvoltage transients. Use Value: 0.05 µA leakage at 8.4 V extends single-charge battery life beyond 12 months in standby mode. |
| Industrial PLC I/O Modules | Smart Meter Power Supervision |
Use Scenario: Reference source for isolated 4–20 mA loop transmitter DACs. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable 11 V for current-sense resistor biasing and DAC VREF. Use Value: 150 Ω dynamic resistance ensures <0.1 % line regulation error across 1–5 mA load variation in DIN-rail mounted controllers. |
Use Scenario: Brown-out detection and supply rail clamping in polyphase electricity meters. IC Role / Device Role / Timing Role: Zener-based reset supervisor and overvoltage limiter on 12 V auxiliary rail. Use Value: AEC-Q101 qualification guarantees reliability under repeated thermal cycling and vibration in outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C11-Q | ±5 % tolerance (vs. ±2 %), identical 11 V nominal, same SOD523 package and AEC-Q101 rating | Acceptable where cost sensitivity outweighs tight regulation needs, e.g., non-critical power rail clamping | Select when budget constraints dominate and 10.45–11.55 V range suffices for system margin |
| MMSZ5240B-TP | ±5 % tolerance, 10 V nominal, SOD-123 package (2.7 × 1.4 mm), no AEC-Q101 qualification | Limited to commercial-grade consumer or industrial applications without automotive thermal/vibration demands | Choose only for non-automotive designs where larger footprint and unqualified reliability are acceptable |
Compared with BZX58550-C11-Q, the BZX58550-B11-QX provides tighter regulation for precision analog stages; versus MMSZ5240B-TP, it offers automotive qualification and 3× smaller footprint-critical for next-gen compact modules.
Availability
BZX58550-B11-QX is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical devices, industrial PLC I/O modules, and smart meter power supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B11-QX 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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components and energy-efficient technologies.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and regulation in space- and power-constrained automotive and portable systems.
FAQ
What is the maximum reverse voltage the BZX58550-B11-QX can withstand before breakdown?
The device is rated for a nominal Zener voltage of 11 V at 50 µA, with guaranteed breakdown occurring between 10.8 V and 11.2 V. Its absolute maximum non-repetitive peak reverse voltage is defined by the 40 W surge limit at 100 µs, translating to ~12.6 V for that pulse condition. Continuous operation above 11.2 V risks thermal runaway unless current is strictly limited by external series resistance.
Does the BZX58550-B11-QX require a minimum current to maintain regulation?
Yes - regulation is specified at IZ = 50 µA, and stable Zener behavior requires ≥10 µA to ensure predictable voltage and low dynamic impedance. Below this, voltage deviates significantly; typical knee current is ~1 µA, but regulation accuracy degrades rapidly below 5 µA.
How does the "intentional minor rise of leakage current" improve performance?
Per AN90031, this controlled leakage increase reduces minority-carrier lifetime, lowering stored charge and enabling faster turn-off during transient events. This directly suppresses ringing and overshoot in fast-switching power supply feedback paths and improves noise immunity in precision analog references.
Can BZX58550-B11-QX be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal instability when paralleled. For higher power, use a single higher-rated device (e.g., BZX84-C11) or implement active regulation with a transistor buffer stage.
BZX58550-B11-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):
- 11 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 8.4 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-B11-QX FAQ
1.How can I place an order for BZX58550-B11-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B11-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-B11-QX reliable?
The price and inventory of BZX58550-B11-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-B11-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B11-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B11-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B11-QX?
BZX58550-B11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B11-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-B11-QX?
For technical support, including BZX58550-B11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B11-QX requirements.
6.How does Aetrix verify that BZX58550-B11-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B11-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-B11-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B11-QX?
All BZX58550-B11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B11-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-B11-QX part is unused and in its original packaging.
Return procedure for BZX58550-B11-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B11-QX Tags
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MM5Z5V1ST1G
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