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onsemi BZX84B4V7LT1G
- Part No.:
- BZX84B4V7LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B4V7LT1G.pdf
- Description:
- DIODE ZENER 4.7V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:31,789
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Product details
Overview
BZX84B4V7LT1G from onsemi is a tight-tolerance Zener diode in SOT-23 package, providing precise 4.7 V voltage regulation at 5 mA test current with ±1.5% nominal voltage tolerance (4.61–4.79 V), 80 Ω dynamic impedance, and 3 µA reverse leakage at 3 V. It serves as a stable reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the BZX84B4V7LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its ±1.5% Zener voltage tolerance, 250 mW power rating on FR-5 board, ESD robustness (>16 kV HBM), and compatibility with high-density automated assembly.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its tight 4.7 V tolerance and low 80 Ω Zener impedance at 5 mA ensure stable regulation under varying load and temperature conditions. The SOT-23 package supports surface-mount reflow with 260°C/10s soldering capability.
It exhibits a temperature coefficient of −3.5 mV/°C at 5 mA, enabling predictable drift compensation in reference circuits. Reverse leakage remains ≤3 µA at VR = 3 V, supporting low-quiescent-current designs in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.61–4.79 V @ IZT = 5 mA - ensures ±1.5% regulation accuracy for precision biasing |
| Power Dissipation | 250 mW on FR-5 board - supports continuous operation in compact PCB layouts without forced cooling |
| Zener Impedance | 80 Ω @ IZT = 5 mA - minimizes output voltage variation under load transients |
| Reverse Leakage | ≤3 µA @ VR = 3 V - preserves battery life in always-on monitoring circuits |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and system-level ESD events without derating |
| Capacitance | 260 pF @ VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in signal-path clamping |
| Temp. Coefficient | −3.5 mV/°C @ IZT = 5 mA - enables predictable thermal drift modeling in reference designs |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; forward-biased during normal conduction |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential side; Zener breakdown occurs between Cathode and Anode |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±1.5% (4.61–4.79 V) - reduces need for post-calibration in analog sensor interfaces |
| Low dynamic impedance | 80 Ω @ 5 mA - maintains regulation stability across ±10% load current variation |
| Pb-free & RoHS compliant | Meets IPC-J-STD-020 moisture sensitivity level 1 - eliminates pre-bake requirement for assembly |
| High ESD robustness | Class 3 (>16 kV HBM) - protects downstream ICs in handheld USB/charging ports |
| Optimized for automation | SOT-23 footprint with standardized tape-and-reel (3,000 pcs/reel) - compatible with pick-and-place machines |
Applications
| Portable Power Monitoring | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Monitoring Li-ion battery voltage in Bluetooth earbuds using an ADC with internal 1.8 V reference. IC Role / Device Role / Timing Role: Provides stable 4.7 V Zener reference to scale battery voltage before ADC input. Use Value: Enables ±1% battery SOC estimation without external precision reference IC. |
Use Scenario: Protecting USB data lines from transient overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Clamps VBUS excursions above 5.5 V to prevent damage to USB controller PHY. Use Value: Absorbs >100 A surge current per IEC 61000-4-5 Level 3 while maintaining <10 ns response. |
| Industrial Sensor Biasing | Automotive Cabin Controller Reference |
Use Scenario: Supplying bias current to a 4–20 mA current-loop pressure transducer in factory automation. IC Role / Device Role / Timing Role: Regulates 4.7 V supply for op-amp excitation circuitry driving the loop. Use Value: Maintains loop accuracy within ±0.1% over −40°C to +85°C ambient range. |
Use Scenario: Generating a stable reference for microcontroller ADC measuring HVAC actuator position. IC Role / Device Role / Timing Role: Delivers temperature-compensated 4.7 V reference to MCU's internal ADC reference pin. Use Value: Reduces position measurement error from ±5% to ±0.8% across automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C4V7LT1G | Standard tolerance (±5%: 4.4–5.0 V); higher 15 µA leakage at 3 V | Acceptable where cost-sensitive consumer designs tolerate wider regulation window | Select when ±5% voltage accuracy suffices and BOM cost reduction is prioritized |
| MMSZ4702T1G | Same 4.7 V nominal, ±5% tolerance, but 350 mW rating on FR-5 board | Better suited for higher-power clamping where 250 mW margin is insufficient | Choose when sustained power dissipation exceeds 200 mW or thermal derating headroom is critical |
Compared with BZX84B4V7LT1G, BZX84C4V7LT1G trades tighter voltage control for lower unit cost, while MMSZ4702T1G offers higher power handling at the expense of tolerance - making BZX84B4V7LT1G optimal for precision reference roles where stability and repeatability outweigh raw power capacity.
Availability
BZX84B4V7LT1G is available at Aetrix Electronics and suitable for portable power monitoring, USB port protection, industrial sensor biasing, and automotive cabin controller reference requiring stable component supply across production lifecycles.
Supply support for BZX84B4V7LT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
BZX84BxxxLT1G belongs to onsemi's precision Zener regulator family designed specifically for space-constrained, high-reliability applications demanding tight voltage tolerance, low leakage, and robust ESD performance in SOT-23 packaging.
FAQ
What is the Zener voltage tolerance of BZX84B4V7LT1G?
The BZX84B4V7LT1G has a tight Zener voltage tolerance of ±1.5%, specified as 4.61 V minimum to 4.79 V maximum at 5 mA test current. This tighter tolerance compared to standard-series Zeners (e.g., BZX84C4V7LT1G at ±5%) enables higher-accuracy voltage references in analog signal chains and sensor interfaces without trimming.
Can BZX84B4V7LT1G be used in automotive applications?
Yes - the BZX84B4V7LT1G is part of onsemi's AEC-Q101 qualified portfolio when ordered with SZ prefix (e.g., SZBZX84B4V7LT1G). While the standard BZX84B4V7LT1G meets industrial temperature range (−65°C to +150°C), automotive qualification requires the SZ variant with full PPAP documentation and process controls.
What is the maximum power dissipation of BZX84B4V7LT1G on FR-5 board?
The BZX84B4V7LT1G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient, derating linearly at 2.0 mW/°C above that temperature. At 85°C ambient, its usable power drops to 130 mW - a critical constraint for thermal design in sealed enclosures or high-density PCBs.
How does the no-connect pin (Pin 2) affect PCB layout for BZX84B4V7LT1G?
Pin 2 of BZX84B4V7LT1G is internally unconnected and must remain floating - no copper trace, pad, or via should connect to it. Including a pad risks solder wicking or unintended parasitic coupling; best practice is to omit the pad entirely or use a non-soldermask-defined land pattern to avoid assembly defects.
What is the typical capacitance of BZX84B4V7LT1G at zero bias?
The BZX84B4V7LT1G exhibits 260 pF typical capacitance at VR = 0 V and f = 1 MHz. This value decreases significantly with increasing reverse bias - e.g., to ~100 pF at 2.35 V - making it suitable for moderate-speed clamping but not RF bypass applications where sub-50 pF is required.
BZX84B4V7LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84BxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±1.91%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 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)
BZX84B4V7LT1G FAQ
1.How can I place an order for BZX84B4V7LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B4V7LT1G 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 BZX84B4V7LT1G reliable?
The price and inventory of BZX84B4V7LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B4V7LT1G is usually 5 days.
3.What payment methods are accepted for BZX84B4V7LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B4V7LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B4V7LT1G?
BZX84B4V7LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B4V7LT1G 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 BZX84B4V7LT1G?
For technical support, including BZX84B4V7LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B4V7LT1G requirements.
6.How does Aetrix verify that BZX84B4V7LT1G is sourced from the original manufacturer or authorized distributors?
All BZX84B4V7LT1G 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 BZX84B4V7LT1G meets industry standards.
7.What is the process for return or replacement of BZX84B4V7LT1G?
All BZX84B4V7LT1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B4V7LT1G, 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 BZX84B4V7LT1G part is unused and in its original packaging.
Return procedure for BZX84B4V7LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B4V7LT1G Tags
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