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onsemi BZX84C27LT1
- Part No.:
- BZX84C27LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C27LT1.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,696
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Product details
Overview
BZX84C27LT1 from onsemi is a 27 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 80 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 20.3 V. It serves as a precision voltage reference or overvoltage clamp in space-constrained portable electronics.
For engineers reviewing the BZX84C27LT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOT-23 terminal mapping, ESD robustness (Class 3, >16 kV HBM), and direct alternative options for voltage regulation in battery-powered systems.
Technical Context
The BZX84C27LT1 operates as a two-terminal silicon Zener diode with cathode-anode polarity, exhibiting sharp reverse breakdown at nominal 27 V with temperature coefficient of +18.9 mV/°C. Its 225 mW power rating is thermally limited by junction-to-ambient resistance of 556 °C/W on FR-5 board.
It features no internal connection at pin 2, uses pulse-tested Zener voltage measurement at IZT = 5 mA, and maintains ≤0.90 V forward voltage at 10 mA - enabling bidirectional clamping and low-loss forward conduction where needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.1–28.9 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/average power before thermal shutdown |
| Zener Impedance (ZZT) | 80 Ω at 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage Current | 0.05 µA at 20.3 V - ensures minimal standby power loss in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - supports handling and assembly without external protection in consumer-grade environments |
| Capacitance | 70 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - quantifies self-heating per watt; requires layout derating above 25°C ambient |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward conduction path; connects to lower-potential node during regulation or clamping |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Zener breakdown terminal; ties to regulated voltage rail or clamping node |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Compliant | G-suffix variant available - meets RoHS and ELV requirements without solderability compromise |
| High-Density Packaging | SOT-23 footprint (2.8 × 1.4 × 1.02 mm) enables placement on dense PCBs with <1.5 mm pitch |
| Tight Thermal Management | Rated for 260°C reflow (10 s) - compatible with standard lead-free assembly profiles |
| Stable Temperature Coefficient | +18.9 mV/°C - predictable drift direction allows compensation in precision references |
| Low Capacitance Clamping | 70 pF at 0 V - minimizes signal distortion in data line protection applications |
Applications
| Portable Power Monitoring | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Monitoring Li-ion battery pack voltage in handheld medical devices using resistive divider into ADC input. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end scaling, ensuring ±1% full-scale accuracy across temperature. Use Value: 27 V Zener provides headroom above 24 V nominal pack voltage while maintaining tight 5% tolerance and low tempco for stable scaling ratio. |
Use Scenario: Protecting USB 2.0 data lines (D+/D−) from ESD and transient overvoltage events. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between differential pair and ground. Use Value: 70 pF capacitance avoids signal integrity degradation at 480 Mbps; Class 3 HBM rating eliminates need for external TVS in Class A consumer designs. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Reference |
Use Scenario: Providing stable 27 V bias to op-amp supply rails in 4–20 mA loop transmitter circuitry. IC Role / Device Role / Timing Role: Low-noise voltage regulator for analog signal chain power domain. Use Value: 80 Ω Zener impedance ensures <10 mV ripple under 1 mA load variation; 225 mW rating supports continuous operation in sealed enclosures up to 70°C ambient. |
Use Scenario: Generating local 27 V reference for CAN transceiver bias in 12 V automotive subsystems with boost conversion. IC Role / Device Role / Timing Role: Secondary regulation stage after DC-DC converter, rejecting switching noise. Use Value: +18.9 mV/°C tempco aligns with known thermal gradients in BCM housings, enabling first-order compensation in firmware calibration tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C27LT3 | Same electrical specs; differs only in tape-and-reel packaging (10,000 pcs vs. 3,000 pcs) | Identical function; selected for high-volume automated assembly | Choose BZX84C27LT3 when production volume exceeds 50k units/year and feeder compatibility requires 13-inch reels. |
| BZX84B27LT1 | Tighter 2% Zener tolerance (26.5–27.5 V vs. 25.1–28.9 V); otherwise identical package, power, and thermal specs | Used where absolute voltage accuracy dominates cost sensitivity, e.g., metrology-grade calibration circuits | Select BZX84B27LT1 only if system-level testing confirms 2% tolerance improves closed-loop stability beyond what 5% BZX84C27LT1 achieves. |
Compared with BZX84C27LT1, BZX84C27LT3 offers identical performance in larger reel format for factory automation, while BZX84B27LT1 trades wider tolerance margin for tighter voltage control - making it suitable only where calibration overhead justifies higher unit cost and reduced yield flexibility.
Availability
BZX84C27LT1 is available at Aetrix Electronics and suitable for portable power monitoring, USB port overvoltage clamp, and industrial sensor signal conditioning requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX84C27LT1 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 management, analog, sensors, and logic ICs for automotive, industrial, and cloud infrastructure markets.
The BZX84C27LT1 belongs to the BZX84CxxxLT1 series of standard-tolerance Zener diodes designed specifically for compact, cost-sensitive voltage regulation in high-density portable and battery-powered electronics.
FAQ
What is the maximum continuous power dissipation of the BZX84C27LT1 at 70°C ambient?
The BZX84C27LT1 has a thermal resistance of 556 °C/W on FR-5 board. At 70°C ambient, derating begins above 25°C at 1.8 mW/°C. So maximum power = 225 mW − (1.8 mW/°C × 45°C) = 144 mW. This ensures junction temperature stays within −65°C to +150°C limits. Always verify with actual board layout and airflow in final design. The BZX84C27LT1 must not exceed this derated value in sustained operation.
Does the BZX84C27LT1 have a functional connection on pin 2?
No - pin 2 of the BZX84C27LT1 is internally unconnected (NC), as confirmed in the Electrical Characteristics table and Package Dimensions diagram. It must remain electrically floating on the PCB; routing a trace or placing a pad to pin 2 may cause assembly defects or unintended coupling. The active terminals are pin 1 (anode) and pin 3 (cathode). This NC configuration is consistent across all BZX84CxxxLT1 series devices including the BZX84C27LT1.
What is the Zener voltage tolerance for the BZX84C27LT1, and how is it tested?
The BZX84C27LT1 has a nominal Zener voltage of 27 V with a tolerance of ±5%, meaning guaranteed range is 25.1 V to 28.9 V at 5 mA test current (IZT), per the Electrical Characteristics table. This is measured using pulsed DC current at TA = 25°C to avoid self-heating errors. The BZX84C27LT1 does not use tighter tolerances - for 2% tolerance, the BZX84B27LT1 variant must be selected instead.
Can the BZX84C27LT1 be used for bidirectional ESD protection on data lines?
Yes - the BZX84C27LT1 conducts in forward bias (VF ≤ 0.90 V at 10 mA) and reverse Zener mode, enabling symmetrical clamping when paired anode-to-cathode across a differential pair. Its 70 pF capacitance at 0 V and Class 3 HBM rating (>16 kV) make it suitable for USB 2.0 and RS-485 lines where bandwidth permits. However, dedicated ESD arrays offer lower capacitance; the BZX84C27LT1 is best applied where existing Zener infrastructure supports dual-use. Always validate with TLP testing for your specific interface.
Is the BZX84C27LT1 RoHS-compliant, and what does the 'G' suffix indicate?
Yes - the BZX84C27LT1 is RoHS-compliant when ordered with the 'G' suffix (e.g., BZX84C27LT1G), which explicitly denotes Pb-free terminations and halogen-free molding compound. The base part number BZX84C27LT1 may be supplied in legacy SnPb form unless 'G' is specified. All onsemi BZX84C27LT1G units meet JEDEC J-STD-609A Class 1 moisture sensitivity and pass 260°C reflow per datasheet. Confirm 'G' is included in purchase orders for compliance assurance. The BZX84C27LT1G is the default recommended version.
BZX84C27LT1 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):
- 27 V
- Tolerance:
- ±7%
- Power - Max:
- 225 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)
BZX84C27LT1 FAQ
1.How can I place an order for BZX84C27LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C27LT1 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 BZX84C27LT1 reliable?
The price and inventory of BZX84C27LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C27LT1 is usually 5 days.
3.What payment methods are accepted for BZX84C27LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C27LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C27LT1?
BZX84C27LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C27LT1 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 BZX84C27LT1?
For technical support, including BZX84C27LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C27LT1 requirements.
6.How does Aetrix verify that BZX84C27LT1 is sourced from the original manufacturer or authorized distributors?
All BZX84C27LT1 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 BZX84C27LT1 meets industry standards.
7.What is the process for return or replacement of BZX84C27LT1?
All BZX84C27LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C27LT1, 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 BZX84C27LT1 part is unused and in its original packaging.
Return procedure for BZX84C27LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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