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onsemi BZX84B27LT1G
- Part No.:
- BZX84B27LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B27LT1G.pdf
- Description:
- DIODE ZENER 27V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,176
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Product details
Overview
BZX84B27LT1G from onsemi is a 27 V ±2% tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C, with 80 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 21.4 V. It provides precision voltage regulation in space-constrained applications such as portable power rails and voltage reference circuits.
For engineers reviewing the BZX84B27LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include tight 2% Zener voltage tolerance, low 70 pF capacitance at 0 V bias, ESD robustness (>16 kV HBM), thermal coefficient of +18.9 mV/°C, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This device belongs to onsemi's BZX84BxxxLT1G tight-tolerance Zener series, designed for stable voltage clamping and reference generation where ±2% initial accuracy and predictable temperature drift are required. Its 2 mA Zener test current enables low-power biasing while maintaining low dynamic impedance (80 Ω).
The SOT-23 package features anode (Pin 1), no connection (Pin 2), and cathode (Pin 3) configuration, supporting unidirectional reverse-biased operation only. Thermal resistance is 500 °C/W on FR-4 board, limiting continuous power handling above 25°C without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 27 V nominal, 26.5–27.5 V range at 2 mA - ensures precise clamping within ±2% for stable reference design |
| Power Dissipation | 250 mW on FR-4 at 25°C - supports compact low-power regulation without heatsinking |
| Zener Impedance | 80 Ω max at IZT = 2 mA - maintains voltage stability under small-signal load variations |
| Reverse Leakage | 0.05 μA max at VR = 21.4 V - minimizes quiescent current in battery-powered circuits |
| Capacitance | 70 pF max at VR = 0 V, f = 1 MHz - suitable for high-frequency noise suppression and filtering |
| Temp. Coefficient | +18.9 mV/°C at IZT = 2 mA - enables predictable voltage drift compensation in wide-temperature designs |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and board-level electrostatic discharge without degradation |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, Pb-free and RoHS compliant. Cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held at voltage ≤ cathode minus 27 V to activate regulation |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad should tie this terminal |
| 3 | Cathode | Connected to higher-potential node; defines regulated output voltage referenced to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| Tight 2% Zener tolerance | Enables accurate voltage references without post-production trimming in analog sensor interfaces and ADC bias networks |
| Low 70 pF junction capacitance | Minimizes signal distortion in RF detector circuits and high-speed clamping applications up to ~100 MHz |
| 250 mW FR-4 power rating | Supports direct integration into dense portable PCB layouts without thermal relief pads or layout constraints |
| ESD Class 3 compliance | Eliminates need for external ESD protection in handheld device front-end power rails and I/O line clamping |
| Pb-free and RoHS compliant | Meets global environmental compliance requirements for consumer, industrial, and automotive electronics manufacturing |
Applications
| Portable Power Rail Clamping | Voltage Reference for ADC Bias |
|---|---|
|
Use Scenario: Protecting 3.3 V or 5 V logic rails in smartphones and wearables from transient overvoltage events. IC Role / Device Role / Timing Role: Zener clamp placed between rail and ground to shunt excess energy above 27 V threshold. Use Value: Prevents damage to downstream PMICs and baseband ICs using only 2.9 × 1.3 mm footprint and no active control circuitry. |
Use Scenario: Providing stable 27 V reference for high-resolution SAR ADC biasing in portable instrumentation. IC Role / Device Role / Timing Role: Passive voltage reference source feeding precision op-amp buffer stage. Use Value: Delivers ±2% initial accuracy and +18.9 mV/°C drift predictability, enabling single-point calibration across −40°C to +85°C. |
| Low-Power Sensor Excitation | Overvoltage Protection in USB-C PD Circuits |
|
Use Scenario: Supplying excitation voltage to resistive bridge sensors in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Stable Zener-regulated bias source replacing linear regulator for ultra-low-quiescent-current operation. Use Value: Draws only 0.05 μA leakage at 21.4 V, extending coin-cell life beyond 10 years in sleep-mode dominant deployments. |
Use Scenario: Secondary overvoltage clamp on 20 V PD bus lines to safeguard legacy 5 V/9 V/15 V receivers. IC Role / Device Role / Timing Role: Fast-acting crowbar element triggered when bus exceeds 27 V due to communication fault or adapter mismatch. Use Value: Activates within nanoseconds with 80 Ω dynamic impedance, limiting peak voltage to <28.5 V during 100 ns transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C27LT1G | Standard 5% tolerance (25.1–28.9 V), same SOT-23 package and 80 Ω Zz | Acceptable where ±5% regulation suffices; lower cost but requires margining in precision references | Select BZX84C27LT1G for cost-sensitive consumer power rails where 27 V nominal is sufficient |
| MMSZ4688T1G | 27 V ±5%, 500 mW rating on FR-4, 350 Ω Zz at 1 mA, 100 pF capacitance | Higher power handling but looser tolerance and higher impedance - suited for coarse clamping, not precision refs | Choose MMSZ4688T1G when board space allows larger SOD-123 and thermal budget permits higher dissipation |
Compared with BZX84B27LT1G, BZX84C27LT1G trades ±2% accuracy for broader tolerance and lower unit cost, while MMSZ4688T1G offers higher power but sacrifices impedance and capacitance performance - making BZX84B27LT1G optimal for space-constrained, precision-clamping roles.
Availability
BZX84B27LT1G is available at Aetrix Electronics and suitable for portable power rail clamping, precision ADC biasing, low-power sensor excitation, and USB-C PD overvoltage protection requiring stable component supply and full traceability.
Supply support for BZX84B27LT1G 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX84BxxxLT1G series was developed for high-density, low-power voltage regulation in portable and battery-operated electronics, emphasizing tight tolerance, small footprint, and robust ESD performance.
FAQ
What is the Zener voltage tolerance of BZX84B27LT1G?
The BZX84B27LT1G has a tight ±2% Zener voltage tolerance, specified as 26.5 V to 27.5 V at 2 mA test current. This tighter tolerance than standard Zeners (e.g., BZX84C27LT1G at ±5%) makes BZX84B27LT1G suitable for applications demanding higher initial accuracy without calibration, such as precision reference supplies and sensor bias networks.
What is the maximum power dissipation of BZX84B27LT1G on FR-4 board?
BZX84B27LT1G is rated for 250 mW total power dissipation on FR-4 board at 25°C ambient, derating linearly by 2.0 mW/°C above that temperature. At 75°C ambient, its usable power drops to 150 mW. This rating assumes standard JEDEC-defined copper area and is validated per onsemi's test conditions in the official datasheet.
Does BZX84B27LT1G have a no-connect pin, and how should it be handled on PCB?
Yes, BZX84B27LT1G has Pin 2 designated as "No Connection" per its mechanical outline (Style 8). This terminal is internally unconnected and must remain electrically floating - no PCB trace, via, or copper pour should contact it. Incorrect routing to ground or signal nets may cause assembly defects or functional failure.
What is the reverse leakage current specification for BZX84B27LT1G?
BZX84B27LT1G specifies a maximum reverse leakage current of 0.05 μA at VR = 21.4 V (80% of nominal Zener voltage), measured at 25°C. This ultra-low leakage supports multi-year battery life in always-on IoT sensors and enables use in high-impedance bias networks where leakage would otherwise introduce significant error.
Is BZX84B27LT1G RoHS compliant and lead-free?
Yes, BZX84B27LT1G is Pb-free and fully RoHS compliant, as confirmed in onsemi's official datasheet and packaging documentation. The "G" suffix denotes lead-free construction, and the device meets EU Directive 2011/65/EU requirements. It is qualified for reflow soldering per J-STD-020, with peak temperature tolerance up to 260°C for 10 seconds.
BZX84B27LT1G 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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 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)
BZX84B27LT1G FAQ
1.How can I place an order for BZX84B27LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B27LT1G 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 BZX84B27LT1G reliable?
The price and inventory of BZX84B27LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B27LT1G is usually 5 days.
3.What payment methods are accepted for BZX84B27LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B27LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B27LT1G?
BZX84B27LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B27LT1G 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 BZX84B27LT1G?
For technical support, including BZX84B27LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B27LT1G requirements.
6.How does Aetrix verify that BZX84B27LT1G is sourced from the original manufacturer or authorized distributors?
All BZX84B27LT1G 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 BZX84B27LT1G meets industry standards.
7.What is the process for return or replacement of BZX84B27LT1G?
All BZX84B27LT1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B27LT1G, 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 BZX84B27LT1G part is unused and in its original packaging.
Return procedure for BZX84B27LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B27LT1G Tags
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MM5Z5V1ST1G
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