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NXP Semiconductors BZX84-C3V9/LF1R
- Part No.:
- BZX84-C3V9/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C3V9/LF1R.pdf
- Description:
- DIODE ZENER 3.9V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
BZX84-C3V9/LF1R from NXP Semiconductors is a 3.9 V ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 250 mW total power dissipation at 25 °C ambient, with 3 µA reverse current at 1 V and 0.9 V forward voltage at 10 mA - used for precision low-power voltage reference and overvoltage protection in sensor signal conditioning circuits.
For engineers reviewing the BZX84-C3V9/LF1R datasheet, BZX84-C3V9/LF1R pinout, BZX84-C3V9/LF1R application, or BZX84-C3V9/LF1R equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance values, differential resistance (400–600 Ω), temperature coefficient (−3.5 to −2.5 mV/K), and SOT23 terminal mapping for reliable board-level design and automotive-grade replacement selection.
Technical Context
The BZX84-C3V9/LF1R operates as a two-terminal shunt regulator, maintaining stable 3.9 V output across load variations by conducting reverse current above its breakdown threshold. Its Zener mechanism provides predictable regulation with low dynamic impedance and controlled temperature drift.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it supports non-repetitive peak reverse power dissipation up to 40 W (100 µs pulse) and junction temperatures from −65 °C to +150 °C - meeting AEC-Q101 stress-test requirements for automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7 V to 4.1 V at IZ = 5 mA - defines nominal regulation point with ±5 % tolerance band for cost-sensitive reference applications |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard PCB layout |
| Reverse Current (IR) | 3 µA max at VR = 1 V - ensures low leakage in standby mode for battery-powered systems |
| Differential Resistance (rdif) | 400–600 Ω at IZ = 5 mA - determines regulation stiffness and output voltage variation under load changes |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - specifies anode-to-cathode drop during forward conduction for polarity protection use cases |
| Temperature Coefficient (SZ) | −3.5 to −2.5 mV/K - quantifies voltage drift per degree Celsius, critical for thermal stability in unregulated environments |
| Non-repetitive Peak Reverse Current (IZSM) | 6.0 A at tp = 100 µs - enables transient surge suppression without device failure |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package with 3 leads, 2.8 mm × 1.4 mm footprint, 1.1 mm height, and tin-plated terminations compatible with reflow and wave soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal for forward bias; connected to lower-potential node when used as shunt regulator |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection - must remain floating or grounded per layout guidelines |
| 3 | Cathode (K) | Negative terminal; tied to regulated voltage rail and current-limiting resistor in standard Zener configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring high reliability |
| ±5 % Zener tolerance (BZX84-C series) | Cost-optimized regulation accuracy suitable for non-critical biasing and clamping where tight voltage tolerance is not required |
| Low thermal resistance (Rth(j-a) = 500 K/W) | Enables operation at elevated ambient temperatures without derating when mounted on standard FR4 PCB |
| Non-repetitive peak reverse power (40 W) | Supports transient voltage suppression in ESD-prone interfaces like CAN bus termination and sensor inputs |
| Marking code *B3 | Allows visual identification of BZX84-C3V9 variant on assembled PCBs for traceability and repair verification |
Applications
| Automotive Sensor Biasing | Industrial Signal Conditioning |
|---|---|
Use Scenario: Providing stable 3.9 V reference for analog front-end circuitry in vehicle cabin temperature sensors. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise bias point for op-amp input stages and ADC reference dividers. Use Value: Maintains measurement accuracy across −40 °C to +125 °C ambient range with <±10 mV drift due to known temperature coefficient. |
Use Scenario: Clamping microcontroller I/O pins against overvoltage transients in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional transient suppressor leveraging Zener breakdown and forward conduction paths. Use Value: Limits voltage excursions to ≤4.1 V during 1 kV ESD events while dissipating <250 mW average power. |
| Consumer Power Management | Medical Diagnostic Equipment |
Use Scenario: Regulating auxiliary supply rails for low-noise LDO pre-regulators in portable ultrasound devices. IC Role / Device Role / Timing Role: Pre-regulator element reducing input ripple before ultra-low-noise linear regulators. Use Value: Delivers 3.9 V ±5 % with <600 Ω dynamic impedance, minimizing noise coupling into sensitive analog chains. |
Use Scenario: Stabilizing reference voltage for photodiode amplifier circuits in blood oxygen saturation monitors. IC Role / Device Role / Timing Role: Precision voltage clamp ensuring consistent gain calibration across production batches. Use Value: Enables <0.5 % full-scale error in optical signal processing using 3.9 V Zener-defined feedback network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | 3.3 V nominal, ±5 %, 200 mW Ptot, SOT23 package | Lowers regulation voltage by 0.6 V; requires recalculation of current-limiting resistor value | Select when system design targets tighter 3.3 V reference with identical footprint and thermal profile |
| BZX84-C3V6 | 3.6 V nominal, ±5 %, same SOT23 package and AEC-Q101 qualification | Provides 0.3 V lower clamping threshold; maintains identical thermal and surge ratings | Choose for designs needing marginally reduced overvoltage trip point without layout or sourcing changes |
Compared with BZX84-C3V9/LF1R, MMBZ5226BS-7-F offers lower voltage but reduced power handling, while BZX84-C3V6 retains full compatibility except for a 0.3 V Zener shift - both require validation of downstream circuit tolerance to altered regulation level.
Availability
BZX84-C3V9/LF1R is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial signal conditioning, consumer power management, and medical diagnostic equipment requiring stable component supply with AEC-Q101 compliance and SOT23 footprint consistency.
Supply support for BZX84-C3V9/LF1R 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The BZX84 series was developed to deliver cost-effective, AEC-Q101-qualified Zener regulation in compact SOT23 packages for automotive and industrial voltage reference and protection functions.
FAQ
What is the Zener voltage tolerance of BZX84-C3V9/LF1R?
The BZX84-C3V9/LF1R has a nominal Zener voltage of 3.9 V with ±5 % tolerance, meaning its actual breakdown voltage falls between 3.7 V and 4.1 V when tested at 5 mA reverse current - consistent with the "C" series designation in the BZX84 family and validated per NXP's Product data sheet Rev. 6.
Is BZX84-C3V9/LF1R qualified for automotive use?
Yes, BZX84-C3V9/LF1R is AEC-Q101 qualified per NXP's official documentation, confirming its suitability for automotive applications including engine control, body electronics, and ADAS sensor interfaces where reliability under thermal cycling and vibration is mandatory.
What is the maximum forward current rating for BZX84-C3V9/LF1R?
The absolute maximum forward current for BZX84-C3V9/LF1R is 200 mA, as specified in Table 5 (Limiting Values) of the NXP datasheet - this defines the upper boundary for safe conduction in forward-biased configurations such as polarity protection circuits.
How does the thermal resistance of BZX84-C3V9/LF1R affect its power handling?
BZX84-C3V9/LF1R has a junction-to-ambient thermal resistance (Rth(j-a)) of 500 K/W on standard FR4 PCB. At 25 °C ambient, this limits continuous power dissipation to 250 mW; exceeding this requires ambient derating or enhanced heatsinking to prevent junction temperature from exceeding 150 °C.
What marking code identifies BZX84-C3V9/LF1R on the device body?
BZX84-C3V9/LF1R is marked with code *B3 on its top surface, where "*" is a placeholder for manufacturing site code - this matches Table 4 (Marking codes) in the NXP datasheet and enables visual verification during assembly and field repair.
BZX84-C3V9/LF1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (TO-236AB)
BZX84-C3V9/LF1R FAQ
1.How can I place an order for BZX84-C3V9/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C3V9/LF1R 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/LF1R reliable?
The price and inventory of BZX84-C3V9/LF1R 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/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-C3V9/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V9/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C3V9/LF1R?
BZX84-C3V9/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C3V9/LF1R 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/LF1R?
For technical support, including BZX84-C3V9/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V9/LF1R requirements.
6.How does Aetrix verify that BZX84-C3V9/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-C3V9/LF1R 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/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-C3V9/LF1R?
All BZX84-C3V9/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V9/LF1R, 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/LF1R part is unused and in its original packaging.
Return procedure for BZX84-C3V9/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C3V9/LF1R Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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