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Nexperia USA Inc. BZX84-C3V9,235
- Part No.:
- BZX84-C3V9,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C3V9,235.pdf
- Description:
- DIODE ZENER 3.9V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,800
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Product details
Overview
BZX84-C3V9,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for low-power precision voltage reference and overvoltage protection in signal conditioning and power rail stabilization circuits. It delivers a nominal 3.9 V breakdown voltage at 5 mA, with 90 Ω maximum differential resistance, 3 µA reverse current at 1 V, and operates across –55 °C to +150 °C ambient.
For engineers reviewing the BZX84-C3V9,235 datasheet, BZX84-C3V9,235 pinout, BZX84-C3V9,235 application, or BZX84-C3V9,235 equivalent, this page provides verified Zener parameters, thermal derating guidance, SOT23 terminal mapping, and direct alternatives for 3.9 V regulation in space-constrained industrial and consumer PCBs.
Technical Context
This device functions as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener knee voltage. Its operation relies on controlled avalanche and Zener breakdown mechanisms, with temperature coefficient of –3.5 mV/K at 5 mA ensuring predictable drift in bias networks.
Designed for surface-mount integration, it uses a planar epitaxial silicon process with metallized cathode and anode terminals. The "n.c." (not connected) pin 2 enables mechanical stability without electrical function-critical for consistent solder joint reliability in high-volume reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.70 V to 4.10 V at IZ = 5 mA - defines usable regulation window under standard test conditions |
| Differential Resistance (rdif) | ≤90 Ω - determines output impedance and load regulation error in reference circuits |
| Reverse Current (IR) | ≤3 µA at VR = 1 V - ensures minimal leakage in standby or low-power monitoring paths |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power before thermal derating applies |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs - supports transient surge suppression in ESD-coupled interfaces |
| Junction Temperature (Tj) | 150 °C maximum - constrains PCB layout copper area and airflow requirements for sustained operation |
| Thermal Resistance (Rth(j-a)) | 500 K/W - quantifies self-heating rise per watt on standard FR4, guiding thermal pad design |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and gull-wing lead form optimized for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in shunt regulation configuration |
| 2 | Not Connected (n.c.) | Mechanical support only; must remain unconnected to avoid unintended parasitic paths |
| 3 | Cathode (K) | Zener breakdown terminal; ties to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener tolerance | Enables cost-effective voltage clamping where tight regulation is secondary to robustness and yield |
| 250 mW total power rating | Supports regulation in microcontroller I/O protection, sensor biasing, and low-current reference rails |
| 40 W non-repetitive peak power | Provides single-event surge immunity up to 6 A at 3.9 V without failure in interface protection |
| –3.5 mV/K temperature coefficient | Delivers predictable negative drift for temperature-compensated references when paired with positive-drift components |
| SOT23 package with n.c. pin | Improves mechanical alignment during pick-and-place while eliminating risk of short-circuit from misrouting |
Applications
| Microcontroller I/O Protection | Low-Power Sensor Biasing |
|---|---|
Use Scenario: Clamping 3.3 V GPIO lines against ESD transients in portable IoT nodes. IC Role / Device Role / Timing Role: Shunt regulator placed between I/O pin and ground, activated only during overvoltage events. Use Value: Limits voltage excursion to ≤4.1 V using 3.9 V Zener knee, preventing latch-up in CMOS input stages. |
Use Scenario: Providing stable 3.9 V reference for analog front-end of thermistor-based temperature sensors. IC Role / Device Role / Timing Role: Passive voltage reference sourcing <100 µA bias current to sensor bridge. Use Value: Delivers <3 µA leakage at 1 V reverse bias, minimizing measurement offset in high-impedance sensing paths. |
| USB Interface Voltage Clamp | Industrial Control Signal Conditioning |
Use Scenario: Protecting USB D+ line from hot-plug overshoot and cable-induced surges. IC Role / Device Role / Timing Role: Fast-acting clamp referenced to ground, absorbing 100 µs transients per IEC 61000-4-2 Level 4. Use Value: Withstands 40 W peak power for 100 µs, limiting D+ to 4.1 V without degradation after repeated surges. |
Use Scenario: Stabilizing 4–20 mA loop transmitter supply in programmable logic controller (PLC) analog outputs. IC Role / Device Role / Timing Role: Secondary shunt regulator trimming rail voltage alongside primary LDO. Use Value: Maintains regulation within ±5 % across –40 °C to +85 °C industrial range, supporting long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5227BS-7-F | 3.9 V ±5 %, 200 mW Ptot, SOT23 package, 100 Ω rdif | Higher differential resistance increases regulation error under load variation | Select when legacy ON Semi BOM compatibility is required and 100 Ω impedance is acceptable |
| Vishay BZX84-C3V9-E3-08 | 3.9 V ±5 %, 300 mW Ptot, same SOT23 footprint, 85 Ω rdif | Higher power rating allows 20 % more continuous current before thermal derating | Prefer for higher ambient temperature environments (>70 °C) where 250 mW is marginal |
Compared with BZX84-C3V9,235, the Vishay alternative offers greater thermal headroom for sustained operation, while the ON Semi part trades regulation precision for established supply chain continuity-neither matches Nexperia's 90 Ω rdif and 500 K/W Rth(j-a) combination in compact SOT23.
Availability
BZX84-C3V9,235 is available at Aetrix Electronics and suitable for microcontroller I/O protection, low-power sensor biasing, USB interface clamping, and industrial control signal conditioning requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for BZX84-C3V9,235 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 and industrial-grade components.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for cost-sensitive, space-constrained voltage regulation and protection in consumer, industrial, and computing applications-not automotive-qualified per Rev. 7 documentation.
FAQ
What is the maximum continuous reverse current for reliable regulation?
The BZX84-C3V9,235 is rated for 200 mA maximum forward current, but for Zener operation, continuous reverse current should be limited to maintain junction temperature ≤150 °C. At 25 °C ambient on standard FR4, 50 mA yields ~200 mW dissipation-well within the 250 mW limit and avoids significant thermal derating.
Can pin 2 be grounded or left floating in PCB layout?
Pin 2 is explicitly marked "n.c." (not connected) in the Nexperia datasheet and has no internal connection. It must remain unconnected-neither grounded nor tied to any net-to prevent mechanical stress or unintended coupling. Standard SOT23 footprints accommodate this via isolated pad.
How does the –3.5 mV/K temperature coefficient affect circuit accuracy?
At 5 mA test current, the coefficient causes VZ to decrease by 3.5 mV per Kelvin rise. Over a 100 °C range (–25 °C to +75 °C), this introduces up to ±350 mV drift-requiring compensation in precision references. For non-critical clamping, it remains within the ±5 % tolerance band.
Is this part suitable for automotive applications?
No. Per Nexperia's Rev. 7 datasheet (January 2023), the BZX84-C3V9,235 is explicitly designated as non-automotive qualified. It lacks AEC-Q101 qualification, automotive-grade screening, and extended temperature validation. Automotive designs require Nexperia's separate –Q qualified variants.
BZX84-C3V9,235 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C3V9,235 FAQ
1.How can I place an order for BZX84-C3V9,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C3V9,235 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 BZX84-C3V9,235 reliable?
The price and inventory of BZX84-C3V9,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C3V9,235 is usually 5 days.
3.What payment methods are accepted for BZX84-C3V9,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V9,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C3V9,235?
BZX84-C3V9,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C3V9,235 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 BZX84-C3V9,235?
For technical support, including BZX84-C3V9,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V9,235 requirements.
6.How does Aetrix verify that BZX84-C3V9,235 is sourced from the original manufacturer or authorized distributors?
All BZX84-C3V9,235 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 BZX84-C3V9,235 meets industry standards.
7.What is the process for return or replacement of BZX84-C3V9,235?
All BZX84-C3V9,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V9,235, 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 BZX84-C3V9,235 part is unused and in its original packaging.
Return procedure for BZX84-C3V9,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C3V9,235 Tags
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BZT52C15S-7-F
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MM5Z5V1ST1G
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