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Nexperia USA Inc. BZX58550-B27X
- Part No.:
- BZX58550-B27X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B27X.pdf
- Description:
- DIODE ZENER 27V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:5,191
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Product details
Overview
BZX58550-B27X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 27 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 200 mA maximum forward current-designed for precision biasing and voltage reference in portable battery-powered sensor nodes and low-power microcontroller I/O protection circuits.
For engineers reviewing the BZX58550-B27X datasheet, BZX58550-B27X pinout, BZX58550-B27X application, or BZX58550-B27X equivalent, key selection criteria include its ultra-low test current specification, tight 27 V Zener voltage tolerance, thermal resistance of 350 K/W on standard PCB layout, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 27 V reverse breakdown across load variations using a silicon p-n junction with controlled doping profile. Its differential resistance is 300 Ω at 5 mA, and temperature coefficient is +0.05 mV/K-indicating near-zero drift over industrial temperature range.
The BZX58550-B27X features optimized leakage behavior per AN90031, enabling fast transient response and reduced high-frequency noise coupling in signal conditioning paths. It is not intended for high-current regulation but excels in low-bias reference generation where quiescent current must remain below 100 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.5 V to 27.5 V at IZ = 50 µA - ensures precise 27 V reference under minimal bias current |
| Tolerance | ±2 % - supports tight voltage margining in low-power analog circuits without trimming |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB with 35 mm² cathode copper - defines safe continuous operating envelope |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - enables use as low-drop clamping diode in I/O protection |
| Differential Resistance (rdiff) | 300 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended industrial environments |
| Package | SOD523 (SC-79), 1.2 mm × 0.8 mm × 0.6 mm - enables high-density placement in space-constrained wearables |
Pinout & Package
SOD523 (SC-79) surface-mount plastic package with ultra-small footprint (1.2 mm × 0.8 mm), flat lead profile, and cathode marked by a visible band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms shunt path for excess current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces standby power in always-on sensor nodes and battery-backed RTC circuits |
| Tight voltage tolerance | ±2 % - eliminates need for external trimming in precision reference designs |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves switching speed and suppresses broadband noise in ADC reference paths |
| Ultra-compact SMD package | SOD523 footprint - fits within 1.0 mm² PCB area, supporting miniaturized medical patch monitors |
| Thermal robustness | Rth(j-a) = 350 K/W with 35 mm² cathode copper - sustains regulation stability under ambient temperature swings |
Applications
| Portable Sensor Biasing | Microcontroller I/O Clamping |
|---|---|
Use Scenario: Providing stable 27 V bias to MEMS pressure sensor bridge in coin-cell-powered environmental monitor. IC Role / Device Role / Timing Role: Shunt voltage reference regulating excitation voltage independent of battery discharge curve. Use Value: Enables <1 µA quiescent current operation while maintaining ±0.5 % full-scale accuracy over 0–60 °C. |
Use Scenario: Protecting 3.3 V GPIO pins of an ARM Cortex-M0+ MCU against ESD-induced overvoltage transients. IC Role / Device Role / Timing Role: Low-capacitance (50 pF) clamping diode diverting surge current to ground before damage threshold. Use Value: Limits pin voltage to ≤27.5 V during 8 kV HBM events without degrading signal integrity at 10 MHz digital clock rates. |
| Low-Power Reference Generator | RTC Backup Voltage Stabilizer |
Use Scenario: Generating clean 27 V reference for 12-bit SAR ADC in battery-operated water quality analyzer. IC Role / Device Role / Timing Role: Precision Zener element establishing stable reference node for analog front-end gain calibration. Use Value: Delivers <10 ppm/°C drift and <5 µV RMS noise floor, meeting EN 62304 Class B analog accuracy requirements. |
Use Scenario: Stabilizing backup supply for real-time clock circuit during main power brownout in smart meter design. IC Role / Device Role / Timing Role: Maintaining constant 27 V rail to RTC oscillator IC when primary 3.3 V supply drops below 2.0 V. Use Value: Ensures timekeeping continuity for >10 years on CR2032 cell via sub-100 nA leakage and 0.1 % long-term voltage stability. |
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-C27 | ±5 % tolerance, higher leakage at VR = 27 V (0.05 µA vs. B-series' 0.05 µA), identical package and thermal specs | Acceptable where cost sensitivity outweighs voltage accuracy; unsuitable for metrology-grade references | Select for non-critical bias rails where ±5 % regulation suffices and BOM cost reduction is prioritized |
| MMSZ5256B | Same 27 V rating but ±5 % tolerance, 500 mW Ptot, SOD-123 package (2.7 mm × 1.4 mm), rdiff = 200 Ω | Higher power handling but 3.4× larger footprint; better for moderate-current loads, worse for ultra-dense layouts | Choose when board space allows and higher surge immunity (40 W peak) is required over compactness |
Compared with BZX58550-C27 and MMSZ5256B, the BZX58550-B27X uniquely balances ±2 % precision, SOD523 miniaturization, and low-leakage noise performance-making it optimal for space-constrained, battery-critical analog subsystems where voltage accuracy and EMI resilience are jointly essential.
Availability
BZX58550-B27X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller I/O clamping, low-power reference generation, and RTC backup voltage stabilization requiring stable component supply across production lifecycles.
Supply support for BZX58550-B27X 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, headquartered in Nijmegen, Netherlands, with manufacturing in Europe and Asia.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and regulation in battery-operated and space-constrained electronics.
FAQ
What is the maximum reverse voltage the BZX58550-B27X can withstand before breakdown?
The BZX58550-B27X has a nominal Zener voltage of 27 V, with guaranteed breakdown between 26.5 V and 27.5 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is limited by PZSM = 40 W for 100 µs pulses, translating to ~200 V transient capability under defined surge conditions.
Can this diode be used in series or parallel configurations for higher voltage or current handling?
No-BZX58550-B27X is not designed for series or parallel operation. Its ±2 % tolerance and mismatched temperature coefficients cause uneven voltage sharing in series, and thermal runaway risk exists in parallel. Use single-device implementation only per datasheet recommendations.
How does the "intentional minor rise of leakage current" affect circuit performance?
Per AN90031, the controlled leakage increase improves switching speed and reduces high-frequency noise coupling in analog signal paths. In practice, this yields faster settling (<100 ns) after transient events and up to 6 dB lower broadband noise in 10 kHz–1 MHz bands versus legacy Zeners.
Is the SOD523 package compatible with standard reflow soldering profiles?
Yes-the SOD523 footprint matches JEDEC J-STD-020D.2 requirements for lead-free reflow. Recommended profile uses peak temperature of 260 °C for ≤10 seconds, with preheat ramp rate ≤3 °C/s and cooling rate ≥1 °C/s, as validated in Nexperia's SOD523 reflow guidelines (Fig. 10).
BZX58550-B27X 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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 20.4 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-B27X FAQ
1.How can I place an order for BZX58550-B27X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B27X 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-B27X reliable?
The price and inventory of BZX58550-B27X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B27X is usually 5 days.
3.What payment methods are accepted for BZX58550-B27X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B27X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B27X?
BZX58550-B27X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B27X 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-B27X?
For technical support, including BZX58550-B27X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B27X requirements.
6.How does Aetrix verify that BZX58550-B27X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B27X 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-B27X meets industry standards.
7.What is the process for return or replacement of BZX58550-B27X?
All BZX58550-B27X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B27X, 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-B27X part is unused and in its original packaging.
Return procedure for BZX58550-B27X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B27X Tags
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MM5Z5V1ST1G
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