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Nexperia USA Inc. BZX58550-C39-QX
- Part No.:
- BZX58550-C39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C39-QX.pdf
- Description:
- DIODE ZENER 39V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,493
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Product details
Overview
BZX58550-C39-Q from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, rated for 39 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use in biasing and reference circuits.
For engineers reviewing the BZX58550-C39-Q datasheet, BZX58550-C39-Q pinout, BZX58550-C39-Q application, or BZX58550-C39-Q equivalent, this page delivers verified electrical characteristics, thermal behavior, automotive qualification status, and SOD523 layout guidance - all critical for low-power voltage reference design in portable and automotive electronics.
Technical Context
This device operates as a precision shunt voltage reference, specified at IZ = 50 µA for stable low-bias operation, with differential resistance of 350 Ω at IZ = 2 mA and temperature coefficient of +0.05 mV/K. Its ultra-small SOD523 footprint enables high-density PCB layouts while maintaining thermal resistance of 350 K/W (junction-to-ambient, 35 mm² cathode copper).
The C-series variant features tighter ±2 % VZ tolerance and intentional minor leakage optimization per AN90031 for fast switching and noise reduction - distinguishing it from the ±5 % B-series. It supports reverse voltages up to 39 V with IR ≤ 0.05 µA at VR = 39 V and exhibits Cd = 45 pF at f = 1 MHz, VR = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V at IZ = 50 µA - precise reference point for low-current bias networks |
| Voltage Tolerance | ±2 % - enables tighter regulation in feedback loops without trimming |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - defines safe continuous operating envelope |
| Differential Resistance | 350 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage Current | ≤ 0.05 µA at VR = 39 V - ensures minimal quiescent current in battery-powered standby circuits |
| Junction Temperature Limit | 150 °C - sets maximum thermal stress margin for automotive under-hood environments |
| Package | SOD523 (SC-79), 1.2 × 0.8 × 0.6 mm - enables 0201-class board space savings with standard reflow compatibility |
Pinout & Package
Package: SOD523 (SC-79), ultra-small flat-lead surface-mount plastic package with cathode marking bar. Dimensions: 1.2 mm × 0.8 mm × 0.6 mm body; lead pitch 0.58 mm; cathode tab occupies side marked by bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes Zener conduction path when Vin > VZ |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at IZ = 50 µA - enables stable regulation in micro-power sensor bias and RTC backup circuits |
| AEC-Q101 qualification | Qualified for automotive applications - supports deployment in infotainment, body control, and ADAS subsystems without additional reliability screening |
| Tight voltage tolerance | ±2 % (C-series) - reduces need for post-assembly calibration in precision reference designs |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - improves transient response and reduces broadband noise in analog front-ends |
| Thermal performance | Rth(j-a) = 350 K/W with 35 mm² cathode Cu - allows sustained 39 V/100 µA operation at 85 °C ambient without derating |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Voltage reference for MEMS pressure and humidity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Shunt regulator providing stable 39 V bias to sensor excitation circuitry. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure long-term accuracy and compliance across -40 °C to +125 °C operating range. |
Use Scenario: Low-quiescent reference for ECG front-end ADC bias in handheld patient monitors. IC Role / Device Role / Timing Role: Precision Zener supplying clean 39 V reference to op-amp gain stages. Use Value: 0.05 µA leakage at 39 V minimizes battery drain during multi-day standby operation. |
| Industrial IoT Edge Nodes | Smart Meter Reference Subsystem |
Use Scenario: Voltage stabilization for LoRaWAN transceiver power management ICs in remote utility meters. IC Role / Device Role / Timing Role: Low-current Zener clamping reference for internal LDO enable threshold detection. Use Value: SOD523 footprint enables compact two-layer PCB layout while maintaining 300 mW thermal headroom. |
Use Scenario: Secondary reference source for metrology-grade voltage scaling in polyphase electricity meters. IC Role / Device Role / Timing Role: Stable 39 V shunt reference feeding resistive divider network for ADC input scaling. Use Value: 350 Ω dynamic impedance ensures <0.1 % line regulation error over 1–5 mA load variation. |
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-B39-Q | ±5 % VZ tolerance; higher leakage at low VR; no intentional leakage optimization | Suitable for non-critical biasing where cost sensitivity outweighs precision | Select when ±5 % regulation is acceptable and AEC-Q101 is not required |
| MMSZ5255B-TP | 39 V nominal, ±5 %, SOD-123 package (2.7 × 1.6 mm), Ptot = 500 mW, rdiff = 70 Ω | Better power handling but 3.4× larger footprint; higher leakage (1 µA @ 39 V) | Choose when higher power margin is needed and board space permits larger package |
Compared with BZX58550-C39-Q, the B39-Q offers lower cost but sacrifices tolerance and automotive qualification, while MMSZ5255B-TP trades miniaturization for improved power capability and lower dynamic impedance - making the C39-Q optimal for space-constrained, precision automotive and portable designs.
Availability
BZX58550-C39-Q is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical monitors, industrial IoT edge nodes, and smart meter reference subsystems requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX58550-C39-Q 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 low-current Zener regulator product line, engineered specifically for precision biasing and voltage reference in space-constrained, low-power automotive and portable electronics.
FAQ
What is the maximum reverse voltage this diode can sustain continuously?
The BZX58550-C39-Q is rated for continuous reverse voltage up to its nominal Zener voltage of 39 V, with leakage current limited to ≤ 0.05 µA at that level. Absolute maximum reverse voltage is not defined separately - operation beyond 39 V risks exceeding the 300 mW power limit and triggering thermal runaway.
Does this part require a series resistor in typical Zener regulator configurations?
Yes - a current-limiting resistor is mandatory to set IZ within 50 µA to 2 mA range. For 39 V output from a 42 V supply, a 3.3 kΩ resistor establishes ~910 µA bias, staying within 300 mW dissipation and optimizing dynamic impedance at ~350 Ω.
How does the C-series differ electrically from the B-series in the same voltage grade?
The C-series (e.g., BZX58550-C39-Q) has ±2 % VZ tolerance versus ±5 % for B-series, lower differential resistance (350 Ω vs. ~400 Ω at 2 mA), and intentionally elevated leakage per AN90031 to improve switching speed and reduce noise - confirmed in Tables 8 and 9 of the datasheet.
Can this diode be used in parallel for higher current capability?
No - Zener diodes exhibit negative temperature coefficients and manufacturing spread, causing current hogging if paralleled. The datasheet specifies single-device operation only; for higher current, use a dedicated shunt regulator IC or discrete transistor-Zener combination.
BZX58550-C39-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 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-C39-QX FAQ
1.How can I place an order for BZX58550-C39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C39-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-C39-QX reliable?
The price and inventory of BZX58550-C39-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-C39-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C39-QX?
BZX58550-C39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C39-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-C39-QX?
For technical support, including BZX58550-C39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C39-QX requirements.
6.How does Aetrix verify that BZX58550-C39-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C39-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-C39-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C39-QX?
All BZX58550-C39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C39-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-C39-QX part is unused and in its original packaging.
Return procedure for BZX58550-C39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C39-QX Tags
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