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onsemi BZX84C15LT3
- Part No.:
- BZX84C15LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C15LT3.pdf
- Description:
- DIODE ZENER 15V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,829
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Product details
Overview
BZX84C15LT3 from onsemi is a 15 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 30 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 12 V. It serves as a precision voltage reference or overvoltage clamp in portable power rails and signal conditioning circuits.
For engineers reviewing the BZX84C15LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (15 V), tolerance (±5%), Zener impedance (30 Ω @ 5 mA), thermal resistance (556 °C/W), and ESD rating (>16 kV HBM).
Technical Context
This device operates as a two-terminal voltage regulation element relying on controlled reverse breakdown. Its Zener voltage is specified at three test currents (2 mA, 5 mA, 20 mA), with temperature coefficient of +9.2 mV/°C at 5 mA - indicating positive drift above 6 V nominal. The SOT-23 package includes a no-connect terminal (Pin 2), enabling mechanical stability without electrical function.
Designed for surface-mount assembly on high-density PCBs, it meets UL 94 V-0 flammability and supports Pb-free reflow per J-STD-020. Junction temperature range spans −65°C to +150°C, with maximum soldering temperature of 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 15 V nominal, min 14.3 V / max 15.8 V @ 5 mA - defines stable regulation point under typical bias |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power before thermal derating |
| Zener Impedance | 30 Ω @ 5 mA - determines AC regulation stiffness and ripple rejection capability |
| Reverse Leakage | 0.05 µA @ 12 V - ensures minimal quiescent current in standby clamping applications |
| Temp Coefficient | +9.2 mV/°C @ 5 mA - quantifies voltage drift with ambient temperature change |
| Capacitance | 110 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity |
| ESD Rating | Class 3 (>16 kV) HBM - supports robust handling in manual assembly and end-use environments |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body with corrosion-resistant finish, UL 94 V-0 rated, cathode marked by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in Zener operation |
| 2 | No Connection | Mechanical support only; must remain unconnected in PCB layout |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Standard Tolerance | ±5% Zener voltage spread - balances cost and precision for non-critical references |
| Low-Leakage Clamping | 0.05 µA @ 12 V - minimizes standby current in battery-powered overvoltage protection |
| High-Density Packaging | SOT-23 footprint (2.8 × 1.2 mm) - enables placement in space-constrained mobile PCBs |
| Automated Assembly Optimized | Transfer-molded case with defined solder pad geometry - ensures consistent pick-and-place and reflow yield |
| Pb-Free Compatible | RoHS-compliant materials and termination - supports lead-free manufacturing compliance |
Applications
| Smartphone Power Rail Protection | USB Interface ESD Clamp |
|---|---|
Use Scenario: Protects 3.3 V or 5 V LDO outputs from transient surges during hot-plug events in compact handheld devices. IC Role / Device Role / Timing Role: Zener clamping diode placed between rail and ground, conducting only during overvoltage excursions. Use Value: Limits peak voltage to ≤15.8 V while drawing <0.05 µA at normal operating voltage - preserving battery life and IC reliability. | Use Scenario: Shields USB data lines (D+/D−) from electrostatic discharge in portable peripherals. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor configured as back-to-back Zener pair (with second diode). Use Value: Leverages 16 kV HBM ESD rating and 110 pF capacitance to absorb fast transients without distorting 480 Mbps USB 2.0 signaling. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller Input Protection |
Use Scenario: Stabilizes reference voltage for analog front-end amplifiers in 4–20 mA loop-powered sensors. IC Role / Device Role / Timing Role: Shunt regulator providing low-drift 15 V reference for op-amp biasing and ADC scaling. Use Value: +9.2 mV/°C tempco enables predictable calibration offset correction across −40°C to +85°C operating range. | Use Scenario: Guards digital input channels against field-induced voltage spikes in factory automation equipment. IC Role / Device Role / Timing Role: Overvoltage limiter tied between 24 V input and ground, clamping transients before optocoupler input stage. Use Value: 225 mW power rating sustains 15 V clamping during 100 ms surge events per IEC 61000-4-5 Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245BLT1 | 15 V nominal, ±5%, 500 mW rating, SOT-23 package, 30 Ω Zz @ 20 mA | Higher power handling enables longer surge duration clamping; larger thermal mass affects PCB layout density | Select when >225 mW transient energy absorption is required and board space allows same-footprint thermal margin |
| BZX84-C15-7-F | 15 V nominal, ±5%, 300 mW rating on ceramic substrate, SOT-23, 30 Ω Zz @ 5 mA, Pb-free | Optimized for alumina substrates; higher power rating requires different thermal design assumptions | Prefer for high-reliability industrial modules where 300 mW on ceramic is specified and FR-5 board derating is insufficient |
Compared with BZX84C15LT3, MMBZ5245BLT1 offers higher surge power but identical voltage spec and footprint, while BZX84-C15-7-F provides greater steady-state power on ceramic - both require verification of thermal path and layout compatibility despite shared SOT-23 form factor.
Availability
BZX84C15LT3 is available at Aetrix Electronics and suitable for smartphone power rail protection, USB interface ESD clamp, and industrial sensor signal conditioning requiring stable component supply and RoHS-compliant sourcing.
Supply support for BZX84C15LT3 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84 series targets cost-sensitive, space-constrained voltage regulation and protection functions in portable and high-density electronics - emphasizing small-form-factor reliability and manufacturability.
FAQ
What is the Zener voltage tolerance for BZX84C15LT3?
The BZX84C15LT3 has a nominal Zener voltage of 15 V with a tolerance of ±5%, meaning the actual measured voltage at 5 mA test current falls between 14.3 V and 15.8 V under standard conditions (TA = 25°C). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet for the BZX84CxxxLT1 series. The "C" suffix explicitly denotes the standard tolerance grade.
Does BZX84C15LT3 have a functional Pin 2?
No, Pin 2 of the BZX84C15LT3 is a no-connect terminal - it serves only as a mechanical support structure within the SOT-23 package and must remain unconnected in the PCB layout. The active terminals are Pin 1 (Anode) and Pin 3 (Cathode), as documented in the Package Dimensions section (page 7) and Electrical Characteristics notes of the onsemi datasheet.
What is the maximum reverse leakage current for BZX84C15LT3?
The maximum reverse leakage current for BZX84C15LT3 is 0.05 µA at VR = 12 V, as specified in the Electrical Characteristics table (page 3). This value reflects worst-case leakage under sub-breakdown conditions and is critical for low-power standby applications such as battery-operated sensor nodes where quiescent current must be minimized.
Can BZX84C15LT3 be used in Pb-free reflow processes?
Yes, BZX84C15LT3 is compatible with Pb-free reflow soldering processes. Its package is rated for a maximum soldering temperature of 260°C for 10 seconds, conforming to J-STD-020 moisture sensitivity and lead-free reflow profiles. While the base part number does not carry the "G" suffix (which explicitly denotes Pb-free packaging), the SOT-23 construction and material specifications meet RoHS requirements as stated in the Specification Features section.
What is the Zener impedance of BZX84C15LT3 and why does it matter?
The BZX84C15LT3 has a maximum Zener impedance (ZZT) of 30 Ω at IZT = 5 mA. This parameter quantifies how much the Zener voltage changes with small variations in current - lower impedance means tighter voltage regulation under dynamic load conditions. In practice, this enables effective ripple suppression in power supply feedback networks and stable reference generation for precision analog circuits.
BZX84C15LT3 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):
- 15 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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)
BZX84C15LT3 FAQ
1.How can I place an order for BZX84C15LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C15LT3 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 BZX84C15LT3 reliable?
The price and inventory of BZX84C15LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C15LT3 is usually 5 days.
3.What payment methods are accepted for BZX84C15LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C15LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C15LT3?
BZX84C15LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C15LT3 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 BZX84C15LT3?
For technical support, including BZX84C15LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C15LT3 requirements.
6.How does Aetrix verify that BZX84C15LT3 is sourced from the original manufacturer or authorized distributors?
All BZX84C15LT3 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 BZX84C15LT3 meets industry standards.
7.What is the process for return or replacement of BZX84C15LT3?
All BZX84C15LT3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C15LT3, 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 BZX84C15LT3 part is unused and in its original packaging.
Return procedure for BZX84C15LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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