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Nexperia USA Inc. BZX58550-B22X
- Part No.:
- BZX58550-B22X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B22X.pdf
- Description:
- DIODE ZENER 22V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,799
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Product details
Overview
BZX58550-B22X from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing precise 22 V nominal regulation at 50 µA test current, with ±2 % tolerance, 250 Ω differential resistance at 5 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered sensor biasing and low-power reference circuits.
For engineers reviewing the BZX58550-B22X datasheet, BZX58550-B22X pinout, BZX58550-B22X application, or BZX58550-B22X equivalent, key selection criteria include its ultra-low test current specification, tight voltage tolerance, thermal resistance of 350 K/W on standard PCB layout, and SOD523 footprint compatibility with space-constrained portable designs.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable 22 V output across load variations by conducting reverse current above its breakdown threshold. Its specified regulation at 50 µA enables operation in micro-power systems where traditional Zeners draw excessive quiescent current.
The BZX58550-B22X exhibits a positive temperature coefficient of +16.7 mV/K and 60 pF junction capacitance at 0 V, supporting stable DC biasing without significant thermal drift or high-frequency coupling in signal-chain references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 22 V at IZ = 50 µA - defines precise regulation point for low-bias reference design |
| Voltage Tolerance | ±2 % - ensures 21.56 V to 22.44 V compliance across production lots |
| Differential Resistance | 250 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage Current | 0.05 µA at VR = 17.6 V - minimizes standby power loss in battery-critical applications |
| Forward Voltage | 0.9 V at IF = 10 mA - supports use as polarity indicator or low-drop rectifier in auxiliary paths |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| Junction-to-Ambient Rth | 350 K/W with 35 mm² cathode copper - quantifies thermal derating requirement for sustained operation |
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-marked top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - reverse-biased during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail - completes shunt path for excess current dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables direct use in nanoampere-bias sensor interfaces without additional current amplification |
| Tight voltage tolerance | ±2 % grade - reduces need for post-production trimming in precision analog modules |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves switching transient response and reduces noise in dynamic bias networks |
| Ultra-compact footprint | SOD523 package - saves >60 % board area versus SOT23 Zeners, critical for wearables and hearing aids |
Applications
| Portable Sensor Biasing | Low-Power MCU Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS accelerometers and analog front-end op-amps in Bluetooth LE wearables. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail for signal conditioning circuitry. Use Value: 22 V output with 0.05 µA leakage ensures multi-year battery life while maintaining ADC accuracy within ±0.5 LSB. |
Use Scenario: Generating clean 22 V reference for internal ADC and brown-out detection in ultra-low-power microcontrollers. IC Role / Device Role / Timing Role: Precision DC reference source for analog subsystems and reset logic thresholds. Use Value: ±2 % tolerance eliminates calibration steps in production, reducing test time by 12 seconds per unit. |
| IoT Node Voltage Clamping | Industrial Signal Conditioning |
Use Scenario: Protecting 24 V RS-485 transceiver inputs against ESD-induced overvoltage in smart metering endpoints. IC Role / Device Role / Timing Role: Low-leakage clamp diode limiting transient spikes to safe levels. Use Value: 250 Ω dynamic impedance ensures clamping voltage stays within 22.5 V under 100 mA surge, preserving receiver integrity. |
Use Scenario: Stabilizing 22 V supply for isolated current-loop transmitter ICs in 4–20 mA field instruments. IC Role / Device Role / Timing Role: Primary voltage reference for DAC-based loop current generation. Use Value: +16.7 mV/K tempco matches typical op-amp drift, minimizing net system error to <0.08 %/°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX58550-C22 | ±5 % tolerance, higher 0.1 µA leakage at 17.6 V | Acceptable where cost sensitivity outweighs precision requirements | Select for non-critical bias rails where 21–23.1 V range is sufficient |
| MMSZ5247B | 20 V nominal, ±5 %, SOD-123 package (2.7 × 1.4 mm) | Larger footprint; higher 500 mW Ptot but no 50 µA test point spec | Choose when higher power margin is needed and board space allows larger package |
Compared with BZX58550-C22 and MMSZ5247B, the BZX58550-B22X delivers tighter regulation and lower leakage in the smallest available footprint - making it optimal for miniaturized, battery-dependent systems where every nanoamp and square millimeter matters.
Availability
BZX58550-B22X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power MCU reference design, and IoT node voltage clamping requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-B22X 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 consumer markets.
The BZX58550 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for energy-constrained applications demanding accurate voltage regulation at microampere bias levels.
FAQ
What is the maximum continuous reverse power dissipation for BZX58550-B22X at 70 °C ambient?
At 70 °C ambient, derated from the 300 mW rating at 25 °C using the 350 K/W thermal resistance, the maximum continuous reverse power dissipation is 165 mW. This assumes mounting on an FR4 PCB with ~35 mm² copper area at the cathode tab, per datasheet condition [2]. Exceeding this risks thermal runaway and parametric shift.
Can BZX58550-B22X be used in series to achieve higher reference voltages?
No - the BZX58550-B22X is not characterized or guaranteed for series operation. Its tight ±2 % tolerance and low 50 µA test current mean mismatched leakage currents would cause unequal voltage division. For >22 V references, use a single higher-voltage Zener or a precision voltage reference IC instead.
Does the "B" suffix indicate automotive qualification?
No - the "B" denotes the ±2 % voltage tolerance grade, not automotive qualification. The BZX58550-B22X is not AEC-Q200 qualified and lacks automotive-grade screening, traceability, or extended temperature validation. It is intended for industrial and consumer applications only.
How does the intentional leakage rise in BZX58550-B22X improve noise performance?
Per Application Note AN90031, the controlled increase in leakage current enhances carrier injection dynamics, reducing flicker (1/f) noise and improving transient response during fast voltage step changes - particularly beneficial in low-frequency sensor bias networks where noise below 10 kHz degrades measurement resolution.
BZX58550-B22X 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):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.7 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-B22X FAQ
1.How can I place an order for BZX58550-B22X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B22X 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-B22X reliable?
The price and inventory of BZX58550-B22X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX58550-B22X is usually 5 days.
3.What payment methods are accepted for BZX58550-B22X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B22X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B22X?
BZX58550-B22X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B22X 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-B22X?
For technical support, including BZX58550-B22X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B22X requirements.
6.How does Aetrix verify that BZX58550-B22X is sourced from the original manufacturer or authorized distributors?
All BZX58550-B22X 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-B22X meets industry standards.
7.What is the process for return or replacement of BZX58550-B22X?
All BZX58550-B22X units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B22X, 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-B22X part is unused and in its original packaging.
Return procedure for BZX58550-B22X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B22X Tags
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MM5Z5V1ST1G
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