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Nexperia USA Inc. BZX58550-B22-QX
- Part No.:
- BZX58550-B22-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B22-QX.pdf
- Description:
- DIODE ZENER 22V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
BZX58550-B22-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 22 V nominal regulation at 50 µA test current with ±2 % tolerance, 250 Ω differential resistance at 5 mA, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-B22-QX datasheet, BZX58550-B22-QX pinout, BZX58550-B22-QX application, or BZX58550-B22-QX equivalent, this page delivers verified electrical characteristics, thermal behavior, automotive-grade reliability data, and precise SOD523 footprint guidance for low-power biasing and voltage reference design.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-biased breakdown at 22 V across its cathode–anode terminals under low-current conditions (IZ = 50 µA to 5 mA). Its temperature coefficient of +16.7 mV/K ensures predictable drift in automotive ambient ranges.
Designed for ultra-low-power systems, it features intentional leakage optimization per AN90031 for fast switching and noise reduction, with junction-to-ambient thermal resistance as low as 285 K/W on 1 cm² cathode copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 22 V at IZ = 50 µA; defines primary regulation point for precision low-current references |
| Voltage Tolerance | ±2 % (B-series); enables tight voltage margin control in safety-critical automotive circuits |
| Differential Resistance | 250 Ω at IZ = 5 mA; determines output impedance and load regulation sensitivity |
| Forward Voltage | 0.9 V at IF = 10 mA; supports bidirectional protection or dual-function biasing paths |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on 35 mm² cathode Cu; sets maximum continuous power handling in compact layouts |
| Junction Temperature Limit | 150 °C; allows operation in under-hood automotive environments without derating below 125 °C ambient |
| AEC-Q101 Qualified | Validated for automotive discrete semiconductor stress testing; meets requirements for engine control, body electronics, and ADAS sensors |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package: 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small flat lead outline with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated voltage node; marked by visible bar; carries reverse breakdown current during regulation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes shunt path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in battery-powered systems with microamp-level standby budgets |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and improves EMI performance in sensor bias networks |
| Automotive qualification | AEC-Q101 compliant - validated for temperature cycling, humidity, mechanical shock, and HTRB stress in automotive ECUs |
| Ultra-compact footprint | SOD523 package - saves >60 % board area vs. SOD323, critical for space-constrained ADAS modules and LED drivers |
| Thermal performance | Rth(j-a) = 285 K/W with 1 cm² cathode copper - enables higher power density in thermally constrained PCB layouts |
Applications
| Automotive Body Control Module (BCM) | Portable Medical Sensor Biasing |
|---|---|
Use Scenario: Stable 22 V reference for LIN transceiver supply monitoring and microcontroller ADC calibration in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference providing precision threshold detection for undervoltage lockout and supply health reporting. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure functional safety compliance (ISO 26262 ASIL-B) without external trimming components. |
Use Scenario: Low-current bias source for photodiode amplifiers and analog front-ends in handheld pulse oximeters. IC Role / Device Role / Timing Role: Precision voltage clamp regulating op-amp supply rails during ultra-low-power sleep cycles. Use Value: 50 µA test current enables operation from coin-cell batteries for >5 years without compromising reference stability. |
| Industrial IoT Node Power Management | Automotive Camera Module Reference |
Use Scenario: Voltage stabilization for RF transceiver LDO enable logic and EEPROM write-voltage supervision in wireless sensor nodes. IC Role / Device Role / Timing Role: Low-leakage shunt regulator ensuring clean enable thresholds across −40 °C to +105 °C operating range. Use Value: +16.7 mV/K temperature coefficient matches system drift budget, eliminating need for digital compensation. |
Use Scenario: Reference voltage generator for auto-exposure control circuitry in rear-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary Zener reference setting gain and offset in analog video signal chain before digitization. Use Value: 150 °C max junction temperature and qualified thermal resistance allow direct mounting near image sensor without heatsinking. |
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-C22-Q | ±5 % tolerance (C-series), higher IR (0.05 µA vs. B-series' 0.05 µA same), identical VZ min/max (20.9–23.1 V) | Acceptable where tighter regulation not required; lower cost for non-safety-critical consumer modules | Select when cost sensitivity outweighs ±2 % tolerance requirement and AEC-Q101 is not mandated |
| MMSZ5247B-7-F | 20 V nominal, ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, Rth(j-a) ≈ 400 K/W | Larger footprint and higher power rating; suited for industrial power supplies but incompatible with ultra-dense layouts | Choose only if board space permits larger package and higher dissipation is needed; not drop-in compatible |
Compared with BZX58550-C22-Q, the BZX58550-B22-QX offers tighter tolerance and automotive qualification at minimal size premium; versus MMSZ5247B-7-F, it delivers 45 % smaller footprint and superior thermal performance in constrained automotive PCBs, despite lower absolute power rating.
Availability
BZX58550-B22-QX is available at Aetrix Electronics and suitable for automotive body electronics, portable medical instrumentation, industrial IoT sensor nodes, and camera module reference designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX58550-B22-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 discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference needs in automotive and portable electronics where size, leakage, and qualification are critical.
FAQ
What is the maximum reverse current at 22 V for BZX58550-B22-QX?
At VR = 22 V and Tamb = 25 °C, the typical reverse current is 0.05 µA, with maximum specified at 0.05 µA per Table 8. This ultra-low leakage supports multi-year battery life in always-on sensor applications and minimizes loading on high-impedance bias networks.
Can BZX58550-B22-QX be used in place of a 22 V Zener in an existing SOD-323 design?
No - BZX58550-B22-QX uses SOD523 (SC-79) package (1.2 × 0.8 mm), while SOD-323 measures 1.7 × 1.3 mm. Pad layout, solder volume, and thermal relief must be redesigned; reflow profile also differs due to smaller thermal mass and different copper exposure.
How does the +16.7 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
Over that range, VZ shifts by approximately ±1.67 V (16.7 mV/K × 100 K), resulting in a total span of 20.33 V to 23.67 V. This is fully characterized in Table 8 and acceptable for non-precision reference roles such as supply monitoring or comparator thresholds.
Is the cathode band polarity consistent across all BZX58550-Q series marking variants?
Yes - per Table 2 and Figure 9, Pin 1 is always cathode (K) and identified by a distinct marking bar on the device body, regardless of voltage variant or B/C series. This ensures unambiguous orientation during automated placement and visual inspection.
BZX58550-B22-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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX58550-B22-QX FAQ
1.How can I place an order for BZX58550-B22-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B22-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-B22-QX reliable?
The price and inventory of BZX58550-B22-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-B22-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B22-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B22-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B22-QX?
BZX58550-B22-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B22-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-B22-QX?
For technical support, including BZX58550-B22-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B22-QX requirements.
6.How does Aetrix verify that BZX58550-B22-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B22-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-B22-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B22-QX?
All BZX58550-B22-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B22-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-B22-QX part is unused and in its original packaging.
Return procedure for BZX58550-B22-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B22-QX Tags
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