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onsemi BZX84C47LT1
- Part No.:
- BZX84C47LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C47LT1.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,349
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Product details
Overview
BZX84C47LT1 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, used for voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C47LT1 datasheet, pinout, applications, or equivalent options, key selection factors include nominal Zener voltage (47 V), tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a silicon p-n junction. Its Zener voltage is specified at three test currents (2 mA, 5 mA, 20 mA) to support design flexibility across bias conditions.
The SOT-23 package features a cathode band on terminal 3, anode on terminal 1, and terminal 2 internally unconnected - a fixed 3-pin configuration optimized for high-density PCB layouts and reflow soldering at 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44–50 V at IZT = 5 mA - defines regulated output range under standard test condition |
| Power Dissipation | 225 mW on FR-5 board at 25°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 170 Ω max at IZT = 5 mA - determines output voltage stability under load transients |
| Reverse Leakage Current | 90 µA max at VR = 37.6 V - quantifies off-state current that affects low-power standby efficiency |
| Temperature Coefficient | +32.9 mV/°C - indicates positive drift rate of VZ with rising junction temperature |
| Capacitance | 40 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robustness against electrostatic discharge during handling and assembly |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting construction, UL 94 V-0 flammability rating, 260°C max soldering temperature for 10 seconds, cathode polarity marked by band.
| 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 electrical function - must remain unconnected on PCB |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and carries regulated output current |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Option Available | BZX84C47LT1G variant meets RoHS compliance without performance trade-off |
| High-Density Packaging | SOT-23 footprint (2.8 × 1.4 × 1.02 mm) enables placement in <1.5 mm pitch layouts |
| Automated Assembly Optimized | Flat lead geometry and corrosion-resistant finish ensure reliable pick-and-place and solder wetting |
| Tight Thermal Management | 556 °C/W junction-to-ambient resistance allows predictable derating above 25°C ambient |
| Stable Low-Leakage Performance | 90 µA max IR at 37.6 V supports battery-powered systems requiring microamp-level quiescent current |
Applications
| Cellular Phone Power Rails | Handheld Medical Monitor Sensors |
|---|---|
Use Scenario: Regulating auxiliary 47 V bias supply for RF front-end amplifiers in LTE/5G handset designs. IC Role / Device Role / Timing Role: Zener diode providing stable reference voltage for LDO input staging and PA bias control. Use Value: 47 V nominal breakdown ensures headroom for 45 V system rails while 170 Ω ZZT maintains <100 mV output variation under 10 mA load steps. | Use Scenario: Clamping and overvoltage protection for analog front-end inputs in portable ECG/SpO₂ modules. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing transient surges beyond sensor signal range. Use Value: 90 µA leakage at 37.6 V avoids loading high-impedance biopotential nodes; >16 kV HBM ESD rating withstands clinical handling events. |
| High-Density PC Board Voltage Reference | Industrial IoT Node Battery Monitoring |
Use Scenario: Generating precise 47 V reference for ADC calibration in compact industrial PLC I/O modules. IC Role / Device Role / Timing Role: Passive voltage reference element feeding into op-amp buffer stage for measurement circuitry. Use Value: ±5% tolerance and +32.9 mV/°C TC enable predictable error budgeting across −40°C to +85°C operating range. | Use Scenario: Monitoring lithium-thionyl chloride (Li-SOCl₂) primary cell voltage decay in remote asset trackers. IC Role / Device Role / Timing Role: Zener-based comparator threshold setpoint for end-of-life battery detection. Use Value: 44–50 V VZ window aligns with 4.5 V/cell × 10-cell stack nominal; 40 pF capacitance avoids signal distortion in slow-slew monitoring paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5270BLT1 | 91 V nominal Zener voltage, same SOT-23 package, 150 mW rating | Designed for higher-voltage clamping (e.g., telecom line interface), not direct 47 V replacement | Select only when system requires >80 V regulation; incompatible for 47 V target due to 91 V VZ |
| BZX84C47LT3 | Identical electrical specs, differs only in tape-and-reel packaging (10,000 pcs vs. 3,000 pcs) | No functional difference; suited for high-volume production runs with larger reel capacity needs | Drop-in substitute for BZX84C47LT1 where logistics require 13-inch reels instead of 7-inch |
Compared with BZX84C47LT1, MMBZ5270BLT1 serves higher-voltage applications and cannot regulate at 47 V, while BZX84C47LT3 offers identical performance in a different packaging format - making it a true logistical alternative but not an electrical one.
Availability
BZX84C47LT1 is available at Aetrix Electronics and suitable for cellular phone power rails, handheld medical monitor sensors, and high-density PC board voltage reference applications requiring stable component supply across automotive-grade temperature ranges and long-lifecycle programs.
Supply support for BZX84C47LT1 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, medical, and IoT applications.
The BZX84CxxxLT1 series belongs to onsemi's general-purpose Zener diode product line, engineered specifically for compact, cost-sensitive voltage regulation and overvoltage protection in portable and high-density electronic systems.
FAQ
What is the nominal Zener voltage and tolerance of BZX84C47LT1?
The BZX84C47LT1 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 (IZT). This specification is verified per onsemi's Electrical Characteristics table for the BZX84CxxxLT1 series and applies strictly under 25°C ambient conditions. The BZX84C47LT1 maintains this tolerance across its qualified operating temperature range.
How is the pinout configured for BZX84C47LT1 in the SOT-23 package?
The BZX84C47LT1 uses a standardized SOT-23 pinout: Pin 1 is the anode, Pin 2 is internally unconnected (no bond wire), and Pin 3 is the cathode - identified by a visible polarity band on the package. This configuration is confirmed in the "Package Dimensions" section (page 7) and "Electrical Characteristics" tables (pages 3–4) of the official onsemi datasheet for BZX84C47LT1. No alternate pinouts exist for this part number.
What is the maximum power dissipation rating for BZX84C47LT1 and how does it derate with temperature?
The BZX84C47LT1 is rated for 225 mW total power dissipation on FR-5 board at 25°C ambient, with linear derating of 1.8 mW/°C above that temperature. This yields a theoretical zero-power point at approximately 158°C ambient - though the absolute maximum junction temperature remains +150°C. These values are extracted directly from the "Maximum Ratings" table (page 2) of the BZX84C47LT1 datasheet and apply only to the specified board material and mounting conditions.
Does BZX84C47LT1 have Pb-free packaging options, and how is it marked?
Yes, the Pb-free version is designated BZX84C47LT1G and carries the same electrical specifications as BZX84C47LT1. Per onsemi documentation, the "G" suffix explicitly denotes RoHS-compliant, lead-free termination. Device marking for BZX84C47LT1 is "Y16", as listed in the Electrical Characteristics table (page 3); the Y16 code appears laser-etched on the top surface of the SOT-23 package and is independent of Pb-free status.
What is the Zener impedance and reverse leakage current for BZX84C47LT1 at its rated test conditions?
At IZT = 5 mA, the BZX84C47LT1 exhibits a maximum Zener impedance (ZZT) of 170 Ω and a maximum reverse leakage current (IR) of 90 µA at VR = 37.6 V. These parameters are measured per the test conditions defined in the "Electrical Characteristics" table (page 3) and reflect worst-case values across the production lot. The BZX84C47LT1's 170 Ω ZZT directly impacts regulation accuracy under dynamic load changes.
BZX84C47LT1 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):
- 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)
BZX84C47LT1 FAQ
1.How can I place an order for BZX84C47LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C47LT1 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 BZX84C47LT1 reliable?
The price and inventory of BZX84C47LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C47LT1 is usually 5 days.
3.What payment methods are accepted for BZX84C47LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C47LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C47LT1?
BZX84C47LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C47LT1 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 BZX84C47LT1?
For technical support, including BZX84C47LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C47LT1 requirements.
6.How does Aetrix verify that BZX84C47LT1 is sourced from the original manufacturer or authorized distributors?
All BZX84C47LT1 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 BZX84C47LT1 meets industry standards.
7.What is the process for return or replacement of BZX84C47LT1?
All BZX84C47LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C47LT1, 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 BZX84C47LT1 part is unused and in its original packaging.
Return procedure for BZX84C47LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C47LT1 Tags
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