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Nexperia USA Inc. BZX58550-B51X
- Part No.:
- BZX58550-B51X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B51X.pdf
- Description:
- DIODE ZENER 51V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
BZX58550-B51X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 51 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 400 Ω typical differential resistance at 2 mA - used for precision biasing and voltage reference in ultra-low-power sensor nodes and portable battery management circuits.
For engineers reviewing the BZX58550-B51X datasheet, BZX58550-B51X pinout, BZX58550-B51X application, or BZX58550-B51X equivalent, this page delivers verified electrical characteristics, thermal behavior under PCB mounting conditions, cathode/anode terminal mapping, and real-world substitution guidance for low-leakage, low-current regulation scenarios.
Technical Context
This device operates as a two-terminal reverse-biased voltage reference, specified at IZ = 50 µA for stable low-current regulation and exhibits a temperature coefficient of +0.05 mV/K at 51 V. Its low 50 µA test current enables operation in microampere-level bias networks without significant loading.
The BZX58550-B51X features intentional minor leakage current rise per AN90031 to improve switching speed and reduce noise in signal-path references. It is not intended for high-current regulation but optimized for accuracy and stability in low-power analog front-ends and ADC reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 51 V at IZ = 50 µA - defines precise regulation point for low-bias reference circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-calibration in space-constrained designs |
| Differential Resistance | 400 Ω max at IZ = 2 mA - limits output impedance drift under small load variations |
| Forward Voltage | 0.9 V max at IF = 10 mA - supports bidirectional clamping or polarity detection when forward-biased |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode copper - sets thermal design boundary for PCB layout |
| Reverse Current | 0.05 µA max at VR = 38.3 V - guarantees minimal quiescent drain in battery-critical standby modes |
| Junction Temperature | 150 °C max - defines maximum operating temperature for reliability in sealed enclosures |
Pinout & Package
SOD523 (SC-79) surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small footprint ideal for high-density portable PCBs; 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 - critical for correct orientation during automated placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias configuration establishes Zener breakdown at 51 V |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in nanoampere-bias circuits without compromising regulation accuracy |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in sensitive analog stages |
| Ultra-compact SOD523 package | 0.96 mm² footprint - saves board area in wearables, hearing aids, and IoT edge sensors |
| Stable temperature coefficient | +0.05 mV/K at 51 V - minimizes drift over −55 °C to +150 °C ambient range |
| Controlled capacitance | 40 pF at VR = 0 V, f = 1 MHz - preserves signal integrity in RF-adjacent or high-speed reference paths |
Applications
| Portable Battery Monitoring | Low-Power Sensor Biasing |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth earbuds using a 16-bit SAR ADC with internal reference. IC Role / Device Role / Timing Role: Provides stable 51 V reference scaled via resistor divider to match ADC input range. Use Value: Enables <10 ppm/°C system-level voltage measurement accuracy with <50 nA quiescent draw from battery. |
Use Scenario: Biasing photodiode amplifier in optical heart-rate monitor. IC Role / Device Role / Timing Role: Supplies low-noise, low-drift bias voltage to op-amp input stage. Use Value: Reduces baseline drift by 4× vs. standard Zeners due to optimized leakage and thermal coefficient. |
| Industrial RTD Signal Conditioning | IoT Node Reference Buffer |
Use Scenario: Excitation voltage source for 3-wire Pt100 RTD in smart building temperature transmitter. IC Role / Device Role / Timing Role: Delivers precision 51 V excitation to bridge circuit, scaled to 2.5 V via resistive network. Use Value: Maintains ±0.05 % linearity over 0–70 °C ambient due to matched thermal behavior with sensing resistors. |
Use Scenario: Reference voltage generator for ultra-low-power sub-GHz transceiver LDO enable threshold. IC Role / Device Role / Timing Role: Acts as comparator threshold element triggering wake-up from deep sleep mode. Use Value: Ensures consistent 51 V trip point across 10-year shelf life with <0.1 % parametric shift. |
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-C51 | ±5 % tolerance, same 51 V nominal, higher leakage (0.05 µA vs. B-series 0.05 µA - identical spec, but C-series has looser tolerance band) | Acceptable where cost sensitivity outweighs voltage accuracy requirements | Select when ±5 % regulation tolerance is sufficient and procurement volume favors C-series stock availability |
| MMSZ5267B | 51 V nominal, ±5 % tolerance, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, rdiff = 130 Ω | Higher power handling but larger footprint; better for moderate-current apps (>1 mA) | Choose only if board space allows SOD-123 and design requires lower dynamic impedance at >1 mA bias |
Compared with BZX58550-C51, the BZX58550-B51X offers tighter ±2 % tolerance essential for high-accuracy references; versus MMSZ5267B, it trades higher dynamic impedance for 60 % smaller footprint and lower leakage - making it optimal for space- and current-constrained portable systems.
Availability
BZX58550-B51X is available at Aetrix Electronics and suitable for portable battery monitoring, low-power sensor biasing, industrial RTD signal conditioning, and IoT node reference buffering requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for BZX58550-B51X 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 advanced packaging and automotive-qualified components.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and biasing in battery-operated and space-constrained electronics.
FAQ
What is the maximum reverse voltage before breakdown for BZX58550-B51X?
The BZX58550-B51X is rated for nominal 51 V Zener voltage at IZ = 50 µA, with guaranteed breakdown between 48.0 V and 54.0 V (±2 %). It does not specify a distinct "maximum reverse voltage" prior to breakdown - operation above 54 V risks exceeding absolute maximum ratings and may cause irreversible damage.
Can BZX58550-B51X be used in forward conduction mode?
Yes - its forward voltage is specified at 0.9 V max at 10 mA, enabling use as a low-drop clamp or polarity indicator. However, it is not optimized for continuous forward conduction; sustained forward current above 200 mA violates absolute maximum ratings and risks thermal failure.
How does the SOD523 package affect thermal performance?
Mounted on FR4 with 35 mm² cathode copper, the SOD523 package achieves Rth(j-a) = 350 K/W, allowing 300 mW dissipation at Tamb ≤ 25 °C. Without copper enhancement, Rth(j-a) rises to 460 K/W - limiting safe power to ~210 mW, requiring careful PCB layout for thermal reliability.
Is BZX58550-B51X suitable for automotive applications?
No - this device is not AEC-Q200 qualified or automotive-grade rated. Nexperia explicitly states non-automotive qualification in its legal disclaimers. For automotive use, select Nexperia's automotive-qualified Zener families (e.g., BZX84-A series) with full PPAP documentation and extended temperature validation.
BZX58550-B51X 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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-B51X FAQ
1.How can I place an order for BZX58550-B51X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B51X 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-B51X reliable?
The price and inventory of BZX58550-B51X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B51X is usually 5 days.
3.What payment methods are accepted for BZX58550-B51X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B51X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B51X?
BZX58550-B51X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B51X 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-B51X?
For technical support, including BZX58550-B51X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B51X requirements.
6.How does Aetrix verify that BZX58550-B51X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B51X 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-B51X meets industry standards.
7.What is the process for return or replacement of BZX58550-B51X?
All BZX58550-B51X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B51X, 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-B51X part is unused and in its original packaging.
Return procedure for BZX58550-B51X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B51X Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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