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Nexperia USA Inc. BZX58550-B11X
- Part No.:
- BZX58550-B11X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B11X.pdf
- Description:
- DIODE ZENER 11V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,972
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Product details
Overview
BZX58550-B11X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 11 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and optimized leakage behavior for fast switching and noise reduction in portable battery-powered systems.
For engineers reviewing the BZX58550-B11X datasheet, BZX58550-B11X pinout, BZX58550-B11X application, or BZX58550-B11X equivalent, this page delivers verified electrical parameters, thermal resistance values, cathode/anode terminal mapping, and real-world use cases in low-bias analog sensing and micro-power voltage reference circuits.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at 11 V (min 10.8 V, max 11.2 V) under 50 µA test current, exhibiting low differential resistance (≤150 Ω at 5 mA) and a temperature coefficient of +5.4 mV/K - enabling stable regulation across ambient temperatures from −55 °C to +150 °C.
Its ultra-small SOD523 footprint (1.2 mm × 0.8 mm × 0.6 mm), low forward voltage (≤0.9 V at 10 mA), and intentional minor leakage rise per AN90031 support high-density PCB layouts and low-quiescent-current designs where minimal bias current and EMI-sensitive operation are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 11 V (min 10.8 V, max 11.2 V at IZ = 50 µA); defines precise regulation point for low-current reference rails |
| Tolerance | ±2 % (B-series); ensures tight voltage accuracy without trimming in production-scale sensor bias networks |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper; supports continuous operation in thermally constrained wearables |
| Differential Resistance | ≤150 Ω at IZ = 5 mA; maintains regulation stability against load current variations up to 100 µA |
| Forward Voltage | ≤0.9 V at IF = 10 mA; enables efficient anode-side clamping or polarity protection without excessive drop |
| Junction Temperature Limit | 150 °C; allows reliable operation in sealed industrial enclosures with limited airflow |
| Thermal Resistance (j-a) | 350 K/W with 35 mm² cathode Cu area; informs thermal design margin for sustained 200 µA Zener bias |
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 band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marked by bar on package; carries reverse breakdown current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes Zener conduction path; serves as reference return |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables direct use in nanoampere-biased precision sensors without external current boosting |
| Optimized leakage profile | Intentional minor rise per AN90031 reduces switching transients and broadband noise in ADC reference buffers |
| Ultra-compact footprint | SOD523 package fits within 1.0 mm² PCB area - ideal for space-constrained IoT edge nodes and medical patches |
| Stable temperature coefficient | +5.4 mV/K at 11 V - predictable drift behavior simplifies compensation in wide-temperature-range instrumentation |
| High-reliability construction | Qualified per IEC 60134 limiting values with 150 °C junction rating - suitable for extended-life industrial deployments |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Providing stable 11 V bias to MEMS pressure sensor bridge in battery-powered environmental monitor. IC Role / Device Role / Timing Role: Zener diode acting as passive voltage reference for Wheatstone bridge excitation. Use Value: Delivers <1 % regulation error over −25 °C to +70 °C with <2 µA quiescent draw, extending coin-cell life beyond 5 years. |
Use Scenario: Generating clean reset threshold for ultra-low-power ARM Cortex-M0+ MCU in smart lock module. IC Role / Device Role / Timing Role: Regulator diode defining precise 11 V brown-out detection level for POR circuit. Use Value: Enables deterministic reset assertion at 10.9 V with <50 ns response to supply dip, preventing firmware corruption. |
| Low-Noise Analog Front-End | ESD-Safe Signal Clamping |
Use Scenario: Stabilizing gain-setting node in instrumentation amplifier used in wearable ECG front-end. IC Role / Device Role / Timing Role: Low-leakage Zener establishing fixed common-mode voltage for differential input stage. Use Value: Reduces 1/f noise contribution by 12 dB versus standard 1N4740A, improving SNR in sub-10 µV bio-signal acquisition. |
Use Scenario: Protecting UART TX line in industrial gateway against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional clamp formed with series resistor and BZX58550-B11X + BAT54S pair. Use Value: Limits transient overshoot to <12 V with <1 ns clamping latency, preserving RS-232 transceiver integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C11 | ±5 % tolerance (vs. ±2 %), identical 11 V nominal, same SOD523 package and thermal specs | Acceptable where cost sensitivity outweighs tight voltage accuracy; higher IR spread increases reference drift in temp-cycled designs | Select when budget constraints dominate and system calibration compensates for wider VZ spread |
| MMSZ5240B | Same 10 V nominal (not 11 V), ±5 % tolerance, SOD-123 package (2.7 mm × 1.6 mm), 500 mW Ptot | Larger footprint limits high-density layouts; higher power rating unnecessary for µA-biased circuits | Choose only if existing layout accommodates SOD-123 and 10 V suffices; avoid for 11 V–critical references |
Compared with BZX58550-C11, the BZX58550-B11X provides tighter regulation for precision biasing but at higher unit cost; versus MMSZ5240B, it offers superior size efficiency and lower leakage for micro-power designs despite requiring exact 11 V compliance.
Availability
BZX58550-B11X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, low-noise analog front-end, and ESD-safe signal clamping requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX58550-B11X 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 and industrial-grade components.
The BZX58550 series belongs to Nexperia's low-current Zener regulator portfolio, engineered specifically for micro-power analog reference and biasing in battery-operated and space-constrained electronics.
FAQ
What is the maximum reverse current (IR) at 11 V for BZX58550-B11X?
At VR = 11 V and Tamb = 25 °C, the typical reverse current is 0.05 µA, with a maximum specified value of 0.1 µA per Table 8. This ultra-low leakage supports nanoampere-level bias networks in precision sensor interfaces without loading the reference node.
Can BZX58550-B11X be used in place of a 1N4740A?
No - the 1N4740A is a 10 V, 1 W through-hole Zener with ±5 % tolerance and vastly different thermal mass and leakage profile. BZX58550-B11X is a 11 V, 300 mW SMD device optimized for µA bias currents; substitution would cause 1 V overvoltage and insufficient power handling in legacy 1N4740A applications.
Is the cathode band orientation consistent across all SOD523-packaged BZX58550 variants?
Yes - all BZX58550 series devices in SOD523 packaging follow the same pinning: Pin 1 (marked by cathode band) is the cathode (K), Pin 2 is the anode (A). This is confirmed in Table 2 and Figure 9 of the datasheet, and applies uniformly to BZX58550-B11X and all other variants.
Does BZX58550-B11X meet AEC-Q200 requirements for automotive use?
No - the BZX58550 series is not automotive-qualified. The datasheet explicitly states in Section 14 that "Unless this data sheet expressly states that this specific Nexperia product is automotive qualified, the product is not suitable for automotive use." It lacks AEC-Q200 stress testing and qualification documentation.
BZX58550-B11X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX58550
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B11X FAQ
1.How can I place an order for BZX58550-B11X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B11X 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-B11X reliable?
The price and inventory of BZX58550-B11X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B11X is usually 5 days.
3.What payment methods are accepted for BZX58550-B11X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B11X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B11X?
BZX58550-B11X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B11X 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-B11X?
For technical support, including BZX58550-B11X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B11X requirements.
6.How does Aetrix verify that BZX58550-B11X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B11X 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-B11X meets industry standards.
7.What is the process for return or replacement of BZX58550-B11X?
All BZX58550-B11X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B11X, 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-B11X part is unused and in its original packaging.
Return procedure for BZX58550-B11X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B11X Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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