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onsemi BZX84C3V3LT3
- Part No.:
- BZX84C3V3LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C3V3LT3.pdf
- Description:
- DIODE ZENER 3.3V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
BZX84C3V3LT3 from onsemi is a 3.3 V ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 95 Ω dynamic impedance at 5 mA test current and 5 µA maximum reverse leakage at 1 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the BZX84C3V3LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (3.3 V), tolerance (±5%), thermal coefficient (−3.5 mV/°C), ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage regulator using controlled reverse-biased avalanche breakdown. Its −3.5 mV/°C temperature coefficient ensures predictable drift across −65°C to +150°C junction range, and its 450 pF capacitance at 0 V bias supports stable performance in low-frequency regulation circuits.
The SOT-23 package features cathode-indicated polarity band, UL 94 V-0 flammability rating, and 260°C soldering tolerance for 10 seconds. Pin 2 is internally unconnected - only pins 1 (anode) and 3 (cathode) are electrically active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.3 V nominal, 3.1–3.5 V min/max at 5 mA - defines precise clamping threshold for 3.3 V rail protection |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous regulation load without heatsinking |
| Zener Impedance | 95 Ω at 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage | 5 µA max at 1 V - ensures minimal quiescent current in standby mode |
| Temperature Coefficient | −3.5 mV/°C - enables predictable voltage shift for thermal compensation design |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling in manual assembly and field operation |
| Capacitance | 450 pF at 0 V, 1 MHz - impacts high-frequency noise filtering capability in bypass applications |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body with corrosion-resistant, solderable finish; 2.90 mm × 1.30 mm × 1.00 mm footprint; cathode identified by band on terminal 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-bias current enters here during regulation |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB |
| 3 | Cathode | Connected to higher-potential node; voltage reference output referenced to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 power rating | Enables compact voltage regulation without external heat sinking in space-constrained designs |
| Tight 3.3 V ±5% tolerance | Reduces need for post-production calibration in 3.3 V supply monitoring and reference circuits |
| ESD robustness >16 kV HBM | Eliminates requirement for external ESD protection in handheld and portable end equipment |
| AEC-Q101 qualified | Validates reliability for automotive infotainment and body electronics applications |
| Pb-free (RoHS-compliant) option | Supports global environmental compliance without redesign or requalification effort |
Applications
| USB Peripheral Power Clamp | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamping 5 V USB VBUS line to protect downstream 3.3 V logic from overvoltage transients. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing passive overvoltage protection. Use Value: Limits peak voltage to ≤3.5 V using BZX84C3V3LT3's sharp Zener knee, preventing latch-up in connected MCU I/O. |
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: −3.5 mV/°C TC and 5 µA leakage ensure reset assertion remains accurate across industrial temperature range. |
| Portable Sensor Bias Supply | Low-Power LED Current Limiter |
|
Use Scenario: Providing stable 3.3 V bias to analog sensor front-ends in battery-powered wearables. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator maintaining constant sensor excitation voltage. Use Value: 225 mW rating and 95 Ω ZZT allow regulation of up to ~68 mA load while holding voltage within ±2%. |
Use Scenario: Setting fixed forward current for indicator LEDs in IoT edge nodes with variable supply. IC Role / Device Role / Timing Role: Shunt element establishing regulated voltage drop across series current-sense resistor. Use Value: 3.3 V Zener voltage enables precise 10–20 mA LED drive with <1% current variation across 2.8–4.2 V battery range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | 3.3 V ±5%, 350 mW rating, SOD-323 package, 30 Ω ZZT at 20 mA | Higher power handling but larger footprint; lower impedance improves regulation under heavier loads | Prefer when >225 mW dissipation or <50 Ω ZZT required; verify SOD-323 layout compatibility |
| BZX84-C3V3,115 | 3.3 V ±5%, 250 mW, SOT-23, 95 Ω ZZT at 5 mA, same pinout, Nexperia | Identical electrical specs and mechanical form; RoHS-compliant, AEC-Q101 qualified variant | Drop-in alternative with identical BZX84C3V3LT3 functionality and supply chain diversification benefit |
Compared with BZX84C3V3LT3, MMBZ5226BS-7-F offers higher power and lower impedance but requires SOD-323 layout changes, while BZX84-C3V3,115 delivers identical performance in a second-source SOT-23 package with full automotive qualification.
Availability
BZX84C3V3LT3 is available at Aetrix Electronics and suitable for USB power protection, microcontroller reset generation, portable sensor biasing, and low-power LED current control requiring stable component supply across consumer, industrial, and automotive programs.
Supply support for BZX84C3V3LT3 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84C3V3LT3 belongs to onsemi's standard Zener regulator family designed for space-constrained, low-power voltage reference and clamping in portable and high-density electronics.
FAQ
What is the exact Zener voltage tolerance for BZX84C3V3LT3?
The BZX84C3V3LT3 has a nominal Zener voltage of 3.3 V with a guaranteed tolerance of ±5%, meaning the actual measured voltage at 5 mA test current falls between 3.1 V and 3.5 V across the full operating temperature range.
Is pin 2 of BZX84C3V3LT3 electrically functional?
No - pin 2 of the BZX84C3V3LT3 is internally unconnected (NC) and serves only as a mechanical support lead in the SOT-23 package. It must not be soldered to any net on the PCB to avoid unintended shorts or mechanical stress.
Can BZX84C3V3LT3 be used in automotive applications?
Yes - the BZX84C3V3LT3 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive body electronics, infotainment systems, and telematics modules where robustness and long-term reliability are required.
What is the maximum reverse leakage current for BZX84C3V3LT3 at 1 V?
The BZX84C3V3LT3 specifies a maximum reverse leakage current of 5 µA at VR = 1 V and TA = 25°C. This low leakage ensures minimal power loss in battery-critical applications such as wearable sensors and remote controls.
Does BZX84C3V3LT3 have Pb-free packaging options?
Yes - the BZX84C3V3LT3G variant is the Pb-free (RoHS-compliant) version of the part, sharing identical electrical and thermal specifications while meeting global environmental regulations for commercial and industrial use.
BZX84C3V3LT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±6%
- Power - Max:
- 225 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:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C3V3LT3 FAQ
1.How can I place an order for BZX84C3V3LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C3V3LT3 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 BZX84C3V3LT3 reliable?
The price and inventory of BZX84C3V3LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V3LT3 is usually 5 days.
3.What payment methods are accepted for BZX84C3V3LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V3LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C3V3LT3?
BZX84C3V3LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C3V3LT3 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 BZX84C3V3LT3?
For technical support, including BZX84C3V3LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V3LT3 requirements.
6.How does Aetrix verify that BZX84C3V3LT3 is sourced from the original manufacturer or authorized distributors?
All BZX84C3V3LT3 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 BZX84C3V3LT3 meets industry standards.
7.What is the process for return or replacement of BZX84C3V3LT3?
All BZX84C3V3LT3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V3LT3, 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 BZX84C3V3LT3 part is unused and in its original packaging.
Return procedure for BZX84C3V3LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C3V3LT3 Tags
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