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Nexperia USA Inc. BZX58550-B36-QX
- Part No.:
- BZX58550-B36-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-B36-QX.pdf
- Description:
- DIODE ZENER 36V 270MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:9,479
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Product details
Overview
BZX58550-B36-QX from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, designed for precision biasing and voltage reference in space-constrained, low-power circuits. It delivers a nominal 36 V regulation at 50 µA test current, with ±2 % tolerance, 350 Ω differential resistance at 5 mA, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX58550-B36-QX datasheet, BZX58550-B36-QX pinout, BZX58550-B36-QX application, or BZX58550-B36-QX equivalent, this page provides verified electrical specs, thermal behavior under PCB mounting conditions, cathode/anode terminal mapping, automotive-grade reliability data, and direct alternatives for low-current Zener replacement in portable and automotive subsystems.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable reverse-bias breakdown across ambient temperatures from −55 °C to +150 °C. Its specified regulation point is defined at IZ = 50 µA - enabling ultra-low standby current operation - and supports up to 5 mA for improved dynamic stability.
The BZX58550-B36-QX exhibits a positive temperature coefficient of +30.4 mV/K at 36 V, low 45 pF capacitance at 0 V, and 0.05 µA reverse leakage at rated voltage. Thermal resistance from junction to ambient is 350 K/W when mounted on an FR4 PCB with 35 mm² copper area at the cathode tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 36 V at IZ = 50 µA - defines primary regulation point for low-bias reference design |
| Tolerance | ±2 % - enables tight voltage margin control in precision analog sensing and ADC reference paths |
| Differential Resistance | 350 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Forward Voltage | 0.9 V at IF = 10 mA - sets forward conduction threshold for polarity protection or clamping |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C with 35 mm² Cu - defines maximum continuous DC power under standard PCB layout |
| Reverse Leakage Current | 0.05 µA at VR = 36 V - ensures minimal quiescent current draw in battery-powered sleep modes |
| Thermal Resistance Rth(j-a) | 350 K/W - quantifies junction-to-ambient heat transfer efficiency on typical FR4 board |
Pinout & Package
SOD523 (SC-79) plastic surface-mount package: 1.2 mm × 0.8 mm × 0.6 mm body, ultra-small footprint optimized for high-density PCB layouts. Cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse breakdown current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path for voltage stabilization |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Low test current specification | Regulation defined at 50 µA - enables use in microamp-level power domains like IoT sensor nodes |
| Controlled leakage optimization | Intentional minor rise in IR improves switching speed and reduces noise in feedback loops |
| Ultra-compact SOD523 package | 0.96 mm² footprint - supports miniaturization in wearables, ADAS camera modules, and compact ECUs |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Voltage reference for analog front-end of cabin temperature/humidity sensors in HVAC control units. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 36 V bias to op-amp gain stages and ADC input conditioning. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure long-term accuracy and functional safety compliance over vehicle lifetime. |
Use Scenario: Low-power voltage reference in battery-operated pulse oximeter signal chain. IC Role / Device Role / Timing Role: Precision shunt regulator supplying clean bias to transimpedance amplifier and 12-bit SAR ADC. Use Value: 50 µA test current enables <1 µA total reference circuit current, extending single-cell Li-ion battery life beyond 72 hours. |
| Industrial PLC Input Modules | Smart Meter Voltage Monitoring |
Use Scenario: Overvoltage protection and reference generation for 24 V DC digital input isolation circuits. IC Role / Device Role / Timing Role: Clamping diode and reference source for optocoupler bias and transient suppression networks. Use Value: 300 mW power rating and 350 Ω rdiff allow robust response to 1 kV EFT bursts without regulation shift. |
Use Scenario: Secondary reference in polyphase electricity meter for auxiliary supply monitoring. IC Role / Device Role / Timing Role: Standby-mode Zener reference feeding supervisor IC and RTC backup circuitry. Use Value: 0.05 µA leakage at 36 V ensures <10 nA system standby current contribution, meeting IEC 62053-21 Class 0.2 requirements. |
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-C36-Q | ±5 % tolerance, higher 0.1 µA leakage at 36 V, same SOD523 package | Acceptable where cost-sensitive consumer designs tolerate wider voltage margin | Select when tighter tolerance is unnecessary and BOM cost reduction is prioritized |
| MMSZ5255B-TP | 36 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (2.7 × 1.6 mm) | Higher power handling but 2.8× larger footprint; not AEC-Q101 qualified | Choose only for non-automotive industrial use requiring >300 mW dissipation |
Compared with BZX58550-C36-Q, the BZX58550-B36-QX offers tighter regulation and lower leakage for precision analog systems; versus MMSZ5255B-TP, it trades power headroom for AEC-Q101 compliance and 60 % smaller board area - critical for automotive ECU miniaturization.
Availability
BZX58550-B36-QX is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical instrumentation, industrial PLC input conditioning, and smart meter auxiliary supply monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-B36-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 diode portfolio, engineered specifically for low-current voltage reference and biasing in automotive and portable electronics where size, leakage, and long-term stability are critical.
FAQ
What is the maximum continuous reverse power dissipation for BZX58550-B36-QX at 85 °C ambient?
At Tamb = 85 °C, derated power dissipation is 210 mW, calculated using the 300 mW rating at 25 °C and thermal resistance of 350 K/W. This assumes mounting on FR4 with 35 mm² copper at the cathode tab per datasheet condition [2]. No forced airflow or heatsinking is assumed.
Does BZX58550-B36-QX support bidirectional ESD protection?
No - it is a unidirectional Zener diode optimized for reverse-bias voltage regulation. Its forward voltage is 0.9 V at 10 mA, but it lacks symmetric clamping characteristics or IEC 61000-4-2 rating required for dedicated ESD protection. Use dedicated TVS diodes like PESD5V0S1BA for that function.
How does the 50 µA test current affect circuit design?
The 50 µA test current means regulation is characterized at ultra-low bias, enabling use in circuits where total current must remain below 100 µA. Designers should verify that operating current stays within 10–100 µA to maintain specified VZ accuracy and avoid excessive rdiff-induced drift.
Is the SOD523 package compatible with standard reflow profiles?
Yes - the SOD523 package is qualified for lead-free reflow per JEDEC J-STD-020. Recommended peak temperature is 260 °C for ≤ 30 seconds, with ramp rate ≤ 3 °C/s. Figure 10 in the datasheet provides the exact solder land pattern (1.2 mm × 0.5 mm pads, 0.4 mm spacing).
BZX58550-B36-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):
- 36 V
- Tolerance:
- ±2%
- Power - Max:
- 270 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B36-QX FAQ
1.How can I place an order for BZX58550-B36-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-B36-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-B36-QX reliable?
The price and inventory of BZX58550-B36-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-B36-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-B36-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-B36-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-B36-QX?
BZX58550-B36-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-B36-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-B36-QX?
For technical support, including BZX58550-B36-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-B36-QX requirements.
6.How does Aetrix verify that BZX58550-B36-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-B36-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-B36-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-B36-QX?
All BZX58550-B36-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-B36-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-B36-QX part is unused and in its original packaging.
Return procedure for BZX58550-B36-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-B36-QX Tags
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