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Nexperia USA Inc. BZX58550-C3V9-QX
- Part No.:
- BZX58550-C3V9-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX58550-C3V9-QX.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX58550-C3V9-Q 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, battery-powered systems. It delivers a nominal 3.9 V regulation at 50 µA test current, with ±5 % tolerance, 600 Ω max differential resistance at 5 mA, and 2.0 µA max reverse leakage at VR = 3.0 V - enabling stable operation in automotive sensor interfaces and portable IoT power rails.
For engineers reviewing the BZX58550-C3V9-Q datasheet, BZX58550-C3V9-Q pinout, BZX58550-C3V9-Q application, or BZX58550-C3V9-Q equivalent, this page provides verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, and automotive-grade packaging details to support low-power analog design and component selection.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.70 V (min) to 4.10 V (max) at IZ = 50 µA, optimized for low-bias applications where minimal quiescent current is critical. Its intentional minor rise in leakage current improves switching speed and reduces noise per AN90031, distinguishing it from standard Zeners.
Thermal performance is defined across three mounting conditions: Rth(j-a) = 460 K/W (standard FR4), 350 K/W (35 mm² cathode copper), and 285 K/W (1 cm² cathode pad), directly impacting power derating in compact PCB layouts. Junction temperature is rated to 150 °C, supporting under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 50 µA - defines primary regulation point for low-current reference circuits |
| Zener Voltage Range | 3.70 V to 4.10 V - ensures predictable clamping within ±5 % tolerance band |
| Differential Resistance | ≤ 600 Ω at IZ = 5 mA - limits output impedance drift under load variation |
| Reverse Leakage Current | ≤ 2.0 µA at VR = 3.0 V - enables ultra-low standby power in battery-critical designs |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - supports bidirectional protection or dual-use as clamp/rectifier |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 with 35 mm² cathode Cu - sets thermal layout requirements |
| Junction Temperature | −55 °C to +150 °C - qualified for extended automotive ambient ranges |
Pinout & Package
SOD523 (SC-79) ultra-small surface-mount plastic package: 1.2 mm × 0.8 mm × 0.6 mm body, flat lead, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal - reverse-biased during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference function |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Stress-tested for automotive discrete reliability - validated for under-hood temperature cycling and humidity exposure |
| Low Test Current Operation | Specified at 50 µA - minimizes current draw in always-on sensor bias networks and wake-up circuits |
| Optimized Leakage Profile | Intentional minor IR rise per AN90031 - reduces high-frequency noise and improves transient response vs. legacy Zeners |
| Ultra-Small Footprint | SOD523 (1.2 × 0.8 mm) - enables placement in dense MCU power domains and RF module decoupling zones |
| Thermal Derating Flexibility | Rth(j-a) from 285–460 K/W depending on PCB copper area - allows scalable thermal design without package change |
Applications
| Automotive Cabin Sensors | Portable Medical Wearables |
|---|---|
Use Scenario: Voltage reference for MEMS pressure and humidity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Zener diode providing stable 3.9 V bias to ADC input stage and sensor excitation circuitry. Use Value: ±5 % tolerance and low 2.0 µA leakage ensure consistent sensor offset calibration across −40 °C to +125 °C ambient. |
Use Scenario: Low-power voltage clamp in ECG front-end signal conditioning. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting input swing to protect op-amp inputs from overvoltage transients. Use Value: 600 Ω differential resistance and 0.9 V forward drop enable fast clamping without distorting microvolt-level biopotential signals. |
| Industrial IoT Edge Nodes | Smart Home Battery Packs |
Use Scenario: Reference source for Li-ion cell voltage monitoring in wireless sensor nodes. IC Role / Device Role / Timing Role: Precision shunt regulator supplying stable bias to voltage divider and comparator inputs. Use Value: 50 µA test current matches typical sleep-mode current budgets, extending battery life beyond 5 years. |
Use Scenario: Overvoltage protection for USB-C PD negotiation ICs in rechargeable speaker packs. IC Role / Device Role / Timing Role: Cathode-connected Zener clamping VBUS during hot-plug events. Use Value: 300 mW power rating and 150 °C junction limit sustain repeated 20 V surges without degradation in consumer-grade thermal environments. |
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-B3V9-Q | ±2 % tolerance (vs. ±5 %), 1.0 µA max IR at VR = 3.0 V, same SOD523 package | Higher precision required in feedback loops of DC-DC converters; tighter VZ stability needed | Select when regulation accuracy outweighs cost sensitivity and leakage margin is acceptable |
| MMSZ5227B-7-F | 3.6 V nominal, ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, 100 nA IR at VR = 1 V | Larger footprint but higher power handling; used in industrial power supply feedback | Choose when board space permits larger package and >300 mW dissipation is required |
Compared with BZX58550-C3V9-Q, the BZX58550-B3V9-Q offers tighter voltage control at the expense of slightly higher cost and identical thermal constraints, while MMSZ5227B-7-F trades miniaturization for robustness in higher-power analog feedback paths.
Availability
BZX58550-C3V9-Q is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical wearables, industrial IoT edge nodes, and smart home battery packs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX58550-C3V9-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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components and advanced packaging.
The BZX58550-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current voltage reference and biasing in space-constrained, battery-sensitive automotive and portable electronics.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX58550-C3V9-Q has a nominal Zener voltage of 3.9 V, with a guaranteed range of 3.70 V to 4.10 V at IZ = 50 µA. Its absolute maximum non-repetitive peak reverse voltage is not specified independently - instead, it is governed by the 40 W non-repetitive surge rating at tp = 100 µs, which corresponds to ~12.6 V at 3.16 A for that pulse width. Continuous operation must remain within the 3.70–4.10 V regulation band.
Is this device suitable for use in a 12 V automotive system?
Yes - the BZX58550-C3V9-Q is AEC-Q101 qualified and rated for junction temperatures up to 150 °C, making it suitable for 12 V system auxiliary rails such as sensor biasing, CAN transceiver reference, or microcontroller reset circuitry. Its 3.9 V Zener voltage is intended for local regulation, not direct 12 V clamping; external series resistance must be sized to limit power dissipation to ≤300 mW under worst-case load and temperature conditions.
How does the "C" suffix differ from "B" in the BZX58550-Q series?
The "C" suffix denotes ±5 % Zener voltage tolerance and an intentionally elevated reverse leakage current profile optimized for faster switching and lower noise per AN90031. In contrast, "B" parts offer ±2 % tolerance and lower leakage (e.g., 0.8 µA max at VR = 3.0 V for B3V9-Q), prioritizing precision over dynamic performance. Both share identical SOD523 packaging and thermal ratings.
Can this Zener diode be used in forward conduction mode?
Yes - the BZX58550-C3V9-Q exhibits a forward voltage ≤0.9 V at IF = 10 mA, allowing use as a low-drop rectifier or ESD clamp in bidirectional protection schemes. However, its primary design intent is reverse-bias Zener regulation; forward conduction should only be considered for secondary functions where its 200 mA absolute maximum forward current and thermal limits are strictly observed.
BZX58550-C3V9-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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-C3V9-QX FAQ
1.How can I place an order for BZX58550-C3V9-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX58550-C3V9-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-C3V9-QX reliable?
The price and inventory of BZX58550-C3V9-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-C3V9-QX is usually 5 days.
3.What payment methods are accepted for BZX58550-C3V9-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX58550-C3V9-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX58550-C3V9-QX?
BZX58550-C3V9-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX58550-C3V9-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-C3V9-QX?
For technical support, including BZX58550-C3V9-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX58550-C3V9-QX requirements.
6.How does Aetrix verify that BZX58550-C3V9-QX is sourced from the original manufacturer or authorized distributors?
All BZX58550-C3V9-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-C3V9-QX meets industry standards.
7.What is the process for return or replacement of BZX58550-C3V9-QX?
All BZX58550-C3V9-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX58550-C3V9-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-C3V9-QX part is unused and in its original packaging.
Return procedure for BZX58550-C3V9-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX58550-C3V9-QX Tags
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