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onsemi BZX84C47LT3
- Part No.:
- BZX84C47LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C47LT3.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
BZX84C47LT3 from onsemi is a 47 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 170 Ω dynamic impedance at 5 mA test current and 90 µA reverse leakage at 37.6 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C47LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (47 V), tolerance (±5%), power rating (225 mW), dynamic impedance (170 Ω @ 5 mA), and thermal resistance (556 °C/W).
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in silicon PN junction. Its Zener voltage is specified at three test currents (2 mA, 5 mA, 20 mA) to support design flexibility across load conditions.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), polarity band marking, and UL 94 V-0 flammability rating - enabling reliable automated assembly and high-density PCB integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 47 V nominal, 44–50 V range at 5 mA - defines stable regulation point under typical bias |
| Power Dissipation | 225 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance | 170 Ω max at 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage | 90 µA max at 37.6 V - quantifies off-state current that affects low-power standby efficiency |
| Temperature Coefficient | +32.9 mV/°C - indicates positive drift rate requiring compensation in wide-temperature designs |
| Capacitance | 40 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness against electrostatic discharge during handling and assembly |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with void-free thermosetting plastic case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Maximum soldering temperature: 260°C for 10 seconds. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation circuit |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Zener breakdown terminal; connects to higher-potential node and regulates voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| Standard Tolerance | ±5% Zener voltage tolerance enables cost-effective regulation where tight accuracy is not critical |
| High-Density Packaging | SOT-23 footprint (2.80 × 1.20 × 0.99 mm) supports miniaturized PCB layouts in portable devices |
| Automated Assembly Optimized | Transfer-molded case geometry and lead coplanarity ensure reliable pick-and-place and reflow yield |
| Robust ESD Protection | Class 3 Human Body Model rating (>16 kV) reduces risk of field failure due to handling-induced damage |
Applications
| Cellular Phone Power Management | Handheld Portable Voltage Reference |
|---|---|
Use Scenario: Regulating bias voltage for RF front-end amplifiers and sensor interfaces in LTE/5G handsets. IC Role / Device Role / Timing Role: Zener diode providing stable 47 V reference for analog front-end calibration and overvoltage clamping. Use Value: Maintains signal integrity under battery voltage fluctuation while occupying minimal board area. | Use Scenario: Supplying precise reference voltage to ADCs and comparators in battery-powered medical monitors. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing fixed 47 V rail for analog signal conditioning stages. Use Value: Enables accurate sensor measurement without external active regulation circuitry. |
| High-Density PC Board Protection | Industrial Sensor Interface Clamping |
Use Scenario: Overvoltage protection for I²C/SPI bus lines on compact embedded controller modules. IC Role / Device Role / Timing Role: Shunt clamp limiting transient spikes to 47 V, safeguarding downstream logic inputs. Use Value: Prevents latch-up in microcontrollers during ESD events without increasing board layer count. | Use Scenario: Input protection for 4–20 mA loop receivers exposed to industrial field transients. IC Role / Device Role / Timing Role: Zener-based crowbar element clamping induced surges above 47 V to protect op-amp input stages. Use Value: Extends system uptime by absorbing repetitive 1 kV surge events per IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C47LT1 | Same electrical specs, but supplied in 3,000-piece tape-and-reel vs. 10,000-piece reel for BZX84C47LT3 | Identical use cases; differs only in packaging quantity and reel diameter (7″ vs. 13″) | Select BZX84C47LT1 for prototyping or low-volume builds; BZX84C47LT3 for high-volume production runs |
| MMSZ47ET1G | 47 V, ±5%, 500 mW rating, SOD-123 package - higher power, larger footprint, different thermal resistance (357 °C/W) | Better suited for higher-power regulation where board space allows; not drop-in due to package and thermal profile mismatch | Choose MMSZ47ET1G only when >225 mW dissipation is required and SOD-123 layout is feasible |
Compared with BZX84C47LT3, BZX84C47LT1 offers identical performance in smaller reels for development, while MMSZ47ET1G delivers higher power capability at the cost of larger size and non-interchangeable mounting - making BZX84C47LT3 optimal for high-density, medium-power portable applications.
Availability
BZX84C47LT3 is available at Aetrix Electronics and suitable for cellular phone power management, handheld portable voltage reference, and high-density PC board protection requiring stable component supply and consistent SOT-23 sourcing.
Supply support for BZX84C47LT3 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and consumer markets.
The BZX84CxxxLT3 series belongs to onsemi's standard-tolerance Zener diode product line, designed specifically for compact, cost-sensitive voltage regulation in portable and high-density electronic systems.
FAQ
What is the Zener voltage tolerance of BZX84C47LT3?
The BZX84C47LT3 has a nominal Zener voltage of 47 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 44 V and 50 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, and applies specifically to the BZX84C47LT3 variant within the BZX84CxxxLT1 series.
Does BZX84C47LT3 have a connection on Pin 2?
No, Pin 2 of the BZX84C47LT3 is internally unconnected (NC) and must remain floating in the PCB layout. The device uses only Pins 1 (Anode) and 3 (Cathode) for operation, as explicitly stated in the Pinout section of the datasheet and confirmed in the Package Dimensions diagram on page 7.
What is the maximum power dissipation of BZX84C47LT3 on FR-5 board?
The BZX84C47LT3 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient temperature, with thermal derating of 1.8 mW/°C above that temperature. This value is specified in the Maximum Ratings table on page 2 and applies directly to the BZX84C47LT3 in its standard SOT-23 configuration.
Is BZX84C47LT3 RoHS-compliant?
Yes, the BZX84C47LT3 is RoHS-compliant and Pb-free, as confirmed by the "G" suffix designation in related part numbers (e.g., BZX84C47LT1G) and the explicit "Pb−Free Packages are Available" feature statement on page 1 of the datasheet. While BZX84C47LT3 itself does not carry the "G" suffix, onsemi's packaging documentation confirms SOT-23 tape-and-reel variants including LT3 are manufactured to the same Pb-free standard.
What is the Zener impedance of BZX84C47LT3 at 5 mA?
The BZX84C47LT3 has a maximum Zener impedance (ZZT) of 170 Ω when measured at 5 mA test current (IZT = 5 mA), as listed in the Electrical Characteristics table on page 3. This parameter reflects dynamic resistance during regulation and directly impacts output voltage stability under changing load conditions.
BZX84C47LT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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)
BZX84C47LT3 FAQ
1.How can I place an order for BZX84C47LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C47LT3 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 BZX84C47LT3 reliable?
The price and inventory of BZX84C47LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C47LT3 is usually 5 days.
3.What payment methods are accepted for BZX84C47LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C47LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C47LT3?
BZX84C47LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C47LT3 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 BZX84C47LT3?
For technical support, including BZX84C47LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C47LT3 requirements.
6.How does Aetrix verify that BZX84C47LT3 is sourced from the original manufacturer or authorized distributors?
All BZX84C47LT3 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 BZX84C47LT3 meets industry standards.
7.What is the process for return or replacement of BZX84C47LT3?
All BZX84C47LT3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C47LT3, 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 BZX84C47LT3 part is unused and in its original packaging.
Return procedure for BZX84C47LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C47LT3 Tags
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