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onsemi BZX84C3V3
- Part No.:
- BZX84C3V3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C3V3.pdf
- Description:
- DIODE ZENER 3.3V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,039
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Product details
Overview
BZX84C3V3 from ON Semiconductor is a 3.3 V, ±5% tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with zener impedance of 40 Ω at 20 mA and 95 Ω at 5 mA, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84C3V3 datasheet, pinout, applications, or equivalent options, key selection criteria include its tight 3.1–3.5 V zener voltage range at 5 mA, low temperature coefficient (−3.5 mV/°C), 450 pF capacitance at 0 V, and suitability for precision biasing, overvoltage clamping, and signal-level voltage stabilization in space-constrained PCBs.
Technical Context
The BZX84C3V3 operates as a reverse-biased silicon Zener diode with controlled breakdown at nominal 3.3 V, exhibiting a negative temperature coefficient of −3.5 mV/°C and stable regulation down to 1 mA test current. Its 450 pF junction capacitance at 0 V and 1.0 V reverse voltage supports use in low-frequency reference and DC clamp applications.
Designed for surface-mount operation on FR-4 PCBs, it delivers 250 mW steady-state power dissipation with 465°C/W junction-to-ambient thermal resistance, and supports repetitive peak working current up to 250 mA. Forward voltage is ≤0.9 V at 10 mA, confirming standard PN-junction behavior in forward conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.1–3.5 V at IZ = 5 mA - defines precise DC reference window for low-voltage rail sensing |
| Zener Impedance (ZZ) | 40 Ω at 20 mA / 95 Ω at 5 mA - determines regulation stiffness under varying load current |
| Power Dissipation (PD) | 250 mW at TA = 25°C - sets maximum continuous DC power handling on standard FR-4 board |
| Junction Temp Range (TJ) | −55°C to +150°C - enables operation in automotive under-hood and industrial control environments |
| Capacitance (CJ) | 450 pF at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in reference paths |
| Temp Coefficient (dVZ/dT) | −3.5 mV/°C - quantifies drift magnitude across temperature for stability-critical references |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - confirms low-loss forward conduction for dual-direction protection schemes |
Pinout & Package
Package: SOT-23 (3-pin, small-outline transistor), cathode-anode-cathode pin configuration with pin 1 = anode, pin 2 = cathode, pin 3 = cathode (dual-cathode internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reverse-bias input terminal | Connected to lower-potential node during Zener operation; defines polarity for voltage clamping |
| Cathode (Pin 2) | Zener output / reference node | Provides regulated 3.3 V output when reverse-biased; ties to circuit reference point |
| Cathode (Pin 3) | Redundant cathode connection | Internally bonded to Pin 2 for improved current sharing and thermal derating margin |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable 3.1–3.5 V regulation band without post-production trimming |
| Low 450 pF junction capacitance | Minimizes AC signal loading in feedback networks and sensor biasing circuits |
| Negative tempco (−3.5 mV/°C) | Enables predictable, compensatable drift in temperature-sensitive reference designs |
| SOT-23 surface-mount package | Supports automated placement and reflow on high-density PCBs with 2.9 mm × 1.3 mm footprint |
| 250 mA peak forward current rating | Allows safe transient conduction during reverse-polarity or ESD events |
Applications
| USB Port Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line against ESD transients and overvoltage spikes. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector tied between VBUS and GND. Use Value: 3.3 V breakdown prevents downstream 3.3 V logic damage while allowing normal 5 V operation via series impedance. | Use Scenario: Generating a clean, temperature-stable reset threshold for 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in RC-based reset generator. Use Value: Tight 3.1–3.5 V tolerance and −3.5 mV/°C tempco enable reliable reset assertion across −40°C to +85°C. |
| ADC Reference Buffer | Low-Power Sensor Biasing |
Use Scenario: Stabilizing reference voltage for 12-bit SAR ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-noise, low-capacitance shunt reference replacing higher-cost IC references. Use Value: 450 pF capacitance and 40 Ω dynamic impedance minimize reference settling time and noise injection. | Use Scenario: Providing stable bias voltage to MEMS pressure sensor bridges operating from 3.3 V rails. IC Role / Device Role / Timing Role: Low-power Zener reference supplying constant excitation voltage independent of supply ripple. Use Value: 250 mW rating and −55°C to +150°C junction range support long-term reliability in unregulated sensor modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS | Same 3.3 V nominal, ±5% tolerance, but 350 mW PD, 30 Ω ZZ @ 20 mA, SOT-23 package | Higher power handling and lower impedance suit higher-current reference loads | Select MMBZ5226BS when >250 mW dissipation or <40 Ω regulation stiffness is required |
| 1SMA5913BT3G | 3.3 V, ±5%, 1.5 W PD, DO-214AC package, 10 Ω ZZ @ 20 mA | Larger package and higher power target industrial power supply feedback loops | Choose 1SMA5913BT3G for mains-connected systems needing robust surge energy absorption |
Compared with BZX84C3V3, MMBZ5226BS offers tighter regulation at higher current but same footprint, while 1SMA5913BT3G trades miniaturization for 6× power capacity and lower impedance-making BZX84C3V3 optimal for cost-sensitive, space-constrained 3.3 V reference nodes.
Availability
BZX84C3V3 is available at Aetrix Electronics and suitable for USB port protection, microcontroller reset circuits, ADC reference buffering, and low-power sensor biasing requiring stable component supply and consistent parametric performance across production lots.
Supply support for BZX84C3V3 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The BZX84 series belongs to ON Semiconductor's general-purpose Zener diode product line, engineered for precision voltage regulation, clamping, and reference functions in compact, cost-sensitive electronic systems.
FAQ
What is the nominal zener voltage and tolerance of the BZX84C3V3?
The BZX84C3V3 has a nominal zener voltage of 3.3 V with a tolerance of ±5%, resulting in a guaranteed regulation range of 3.1 V to 3.5 V when tested at 5 mA zener current. This tolerance is marked as "C" in the device ordering code and is verified per the Absolute Maximum Ratings table in the official ON Semiconductor datasheet Rev. 1.10. The BZX84C3V3 maintains this specification across its full operating junction temperature range.
Can the BZX84C3V3 be used in forward-biased mode?
Yes, the BZX84C3V3 can conduct in forward bias with a maximum forward voltage of 0.9 V at 10 mA, as specified in the Electrical Characteristics table. This behavior is typical of silicon PN junctions and allows the BZX84C3V3 to serve in bidirectional protection configurations or as a low-drop rectifier in ultra-low-power signal paths. However, its primary design intent and characterization are for reverse-biased zener operation, and forward conduction is not optimized for high-current or switching applications.
What is the thermal resistance and maximum junction temperature for the BZX84C3V3?
The BZX84C3V3 has a junction-to-ambient thermal resistance (RJA) of 465°C/W when mounted on a standard FR-4 PCB (76.2 mm × 114.3 mm), and its maximum operating junction temperature is +150°C. These values are defined in the Absolute Maximum Ratings section of the ON Semiconductor datasheet Rev. 1.10. The BZX84C3V3 also supports storage temperatures from −55°C to +150°C, making it suitable for extended industrial and automotive environments where thermal cycling is expected.
How does the temperature coefficient affect BZX84C3V3 performance in precision reference designs?
The BZX84C3V3 exhibits a temperature coefficient of −3.5 mV/°C at 5 mA, meaning its zener voltage decreases by approximately 3.5 mV per degree Celsius rise in junction temperature. This negative drift must be accounted for in high-accuracy reference circuits-especially those operating across wide ambient ranges. For example, over a 100°C span, the BZX84C3V3 may shift up to 350 mV, limiting absolute accuracy unless compensated. The BZX84C3V3 remains appropriate for moderate-precision applications where drift is acceptable or actively corrected.
Is the BZX84C3V3 pin-compatible with other devices in the BZX84 family?
Yes, all BZX84x Zener diodes-including BZX84C3V3, BZX84C5V1, and BZX84C12-share identical SOT-23 packaging and pinout: Pin 1 = anode, Pins 2 & 3 = cathode. This uniformity allows direct substitution within the same footprint when adjusting zener voltage in existing designs, provided power dissipation, impedance, and temperature coefficient requirements remain compatible. The BZX84C3V3 benefits from this family-level consistency for rapid prototyping and BOM rationalization.
BZX84C3V3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±6%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C3V3 FAQ
1.How can I place an order for BZX84C3V3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C3V3 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 BZX84C3V3 reliable?
The price and inventory of BZX84C3V3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V3 is usually 5 days.
3.What payment methods are accepted for BZX84C3V3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C3V3?
BZX84C3V3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C3V3 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 BZX84C3V3?
For technical support, including BZX84C3V3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V3 requirements.
6.How does Aetrix verify that BZX84C3V3 is sourced from the original manufacturer or authorized distributors?
All BZX84C3V3 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 BZX84C3V3 meets industry standards.
7.What is the process for return or replacement of BZX84C3V3?
All BZX84C3V3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V3, 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 BZX84C3V3 part is unused and in its original packaging.
Return procedure for BZX84C3V3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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