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onsemi BZX84C4V7LT3
- Part No.:
- BZX84C4V7LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C4V7LT3.pdf
- Description:
- DIODE ZENER 4.7V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
BZX84C4V7LT3 from onsemi is a 4.7 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 80 Ω dynamic impedance at 5 mA test current and 3 µA reverse leakage at 3.2 V, used for voltage regulation and reference in space-constrained portable electronics.
For engineers reviewing the BZX84C4V7LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), junction temperature range (−65 to +150°C), and SOT-23 footprint compatibility.
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a silicon PN junction. Its Zener voltage is specified at three test currents (1 mA, 5 mA, 20 mA), with temperature coefficient of −3.5 mV/°C and capacitance of 260 pF at 0 V bias and 1 MHz.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with void-free thermosetting plastic case, UL 94 V-0 flammability rating, and maximum soldering temperature of 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 4.7 V nominal, min 4.4 V / max 5.0 V at 5 mA - defines stable regulation point under typical bias |
| Power Dissipation | 225 mW on FR-5 board at 25°C - sets maximum continuous DC power before thermal derating |
| Zener Impedance | 80 Ω at 5 mA - determines output voltage stability under load current variation |
| Reverse Leakage | 3 µA at VR = 3.2 V - limits standby current in high-impedance bias networks |
| Capacitance | 260 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - enables direct handling without special ESD controls in assembly |
| Temp Coefficient | −3.5 mV/°C at 5 mA - quantifies voltage drift over industrial temperature range |
Pinout & Package
SOT-23 surface-mount package (Case 318, Style 8), 3-pin configuration with pin 2 internally unconnected. Dimensions: 2.80–3.04 mm length, 1.20–1.40 mm width, 0.99–1.26 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 | No Connection | Internally isolated; no PCB trace or pad required |
| 3 | Cathode | Zener breakdown terminal; connects to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Compliant | RoHS-compliant packaging available (G-suffix variants); supports lead-free reflow profiles |
| High-Density Mounting | SOT-23 footprint (2.8 × 1.2 mm) enables placement on dense PCBs where space is constrained |
| Automated Assembly Optimized | Transfer-molded case geometry and corrosion-resistant finish ensure reliable pick-and-place and soldering yield |
| Tight Thermal Management | 556 °C/W junction-to-ambient thermal resistance on FR-5 allows predictable derating above 25°C |
| Robust ESD Protection | Class 3 HBM rating (>16 kV) eliminates need for external ESD protection in most consumer interfaces |
Applications
| Smartphone Power Rail Clamping | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Clamp transient spikes on 5 V USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy to hold voltage below IC damage threshold. Use Value: 4.7 V breakdown ensures safe clamping margin below 5.5 V USB spec limit while minimizing standby leakage. | Use Scenario: Provide precise 4.7 V reference for ADC input scaling in battery fuel gauges. IC Role / Device Role / Timing Role: Passive voltage reference source establishing known full-scale input for analog-to-digital conversion. Use Value: ±5% tolerance and −3.5 mV/°C TC enable <1% total error across −20 to +70°C operating range. |
| IoT Sensor Bias Network | Wearable Device LDO Feedback Divider |
Use Scenario: Stabilize bias voltage for MEMS microphone preamplifier in ultra-low-power wearable sensor node. IC Role / Device Role / Timing Role: Low-quiescent-current Zener providing stable reference for op-amp biasing network. Use Value: 3 µA leakage at 3.2 V enables microamp-level system sleep current without compromising reference accuracy. | Use Scenario: Set output voltage of adjustable LDO in compact hearable device using resistive feedback divider. IC Role / Device Role / Timing Role: Precision voltage node defining feedback ratio for output regulation loop. Use Value: SOT-23 size fits tight layout constraints near LDO IC; 80 Ω Zz minimizes regulation error from divider current loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BLT1 | Same 4.7 V nominal, but ±10% tolerance and 100 Ω Zz at 20 mA - looser regulation precision | Higher leakage (5 µA @ 3.2 V) and lower ESD rating (Class 2) | Acceptable where cost sensitivity outweighs precision and robustness requirements |
| BZX84C4V7LT1G | Identical electrical specs; Pb-free variant with same SOT-23 package and 3000/reel tape format | No functional difference; differs only in RoHS compliance and packaging quantity | Preferred for new designs requiring lead-free manufacturing and smaller order increments |
Compared with BZX84C4V7LT3, MMBZ5227BLT1 trades tighter voltage control and ESD robustness for lower unit cost, while BZX84C4V7LT1G offers identical performance in a RoHS-compliant, smaller-reel format suitable for prototyping and low-volume production.
Availability
BZX84C4V7LT3 is available at Aetrix Electronics and suitable for smartphone power rail clamping, USB port overvoltage protection, and IoT sensor bias network applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84C4V7LT3 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent edge applications.
The BZX84C4V7LT3 belongs to the BZX84CxxxLT1 Zener regulator family, designed specifically for space-constrained, low-power voltage reference and clamping in portable and high-density electronics.
FAQ
What is the Zener voltage tolerance for BZX84C4V7LT3?
The BZX84C4V7LT3 has a nominal Zener voltage of 4.7 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 4.4 V and 5.0 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, under the BZX84CxxxLT1 series column for device marking "Z1".
Does BZX84C4V7LT3 have a connected pin 2?
No, pin 2 of the BZX84C4V7LT3 is internally not connected (NC), as explicitly stated in the Pinout section on page 7 of the datasheet and confirmed in the Electrical Characteristics tables. The device functions as a two-terminal Zener diode using only pin 1 (anode) and pin 3 (cathode); pin 2 must remain unconnected on the PCB.
What is the maximum power dissipation of BZX84C4V7LT3 on FR-5 board?
The BZX84C4V7LT3 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with thermal resistance of 556 °C/W. Above 25°C, power must be linearly derated by 1.8 mW/°C, as specified in the Maximum Ratings table on page 2 of the datasheet.
Is BZX84C4V7LT3 RoHS compliant?
The standard BZX84C4V7LT3 is not inherently Pb-free; however, the Pb-free variant BZX84C4V7LT1G is explicitly listed in the Ordering Information table on page 2 and marked with the "G" suffix. The base BZX84C4V7LT3 part uses standard leaded terminations unless otherwise specified by the distributor or order code.
What is the reverse leakage current specification for BZX84C4V7LT3?
The BZX84C4V7LT3 exhibits a maximum reverse leakage current of 3 µA at VR = 3.2 V, as documented in the Electrical Characteristics table on page 3. This value is measured at 25°C ambient and defines the upper bound of standby current when the device is reverse-biased below its Zener knee.
BZX84C4V7LT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±6%
- Power - Max:
- 225 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)
BZX84C4V7LT3 FAQ
1.How can I place an order for BZX84C4V7LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C4V7LT3 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 BZX84C4V7LT3 reliable?
The price and inventory of BZX84C4V7LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C4V7LT3 is usually 5 days.
3.What payment methods are accepted for BZX84C4V7LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C4V7LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C4V7LT3?
BZX84C4V7LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C4V7LT3 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 BZX84C4V7LT3?
For technical support, including BZX84C4V7LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C4V7LT3 requirements.
6.How does Aetrix verify that BZX84C4V7LT3 is sourced from the original manufacturer or authorized distributors?
All BZX84C4V7LT3 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 BZX84C4V7LT3 meets industry standards.
7.What is the process for return or replacement of BZX84C4V7LT3?
All BZX84C4V7LT3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C4V7LT3, 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 BZX84C4V7LT3 part is unused and in its original packaging.
Return procedure for BZX84C4V7LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C4V7LT3 Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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