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onsemi BZX84C27LT3
- Part No.:
- BZX84C27LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C27LT3.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:50,000
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Product details
Overview
BZX84C27LT3 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 provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C27LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (27 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, conducting in reverse breakdown to clamp voltage across its cathode-anode terminals. Its Zener voltage is specified at three test currents (2 mA, 5 mA, 10 mA), with temperature coefficient of +18.9 mV/°C at 5 mA - indicating positive drift above 6 V threshold.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with void-free thermosetting plastic case rated UL 94 V-0 and maximum soldering temperature of 260°C for 10 seconds. Junction temperature range spans −65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 27 V nominal, 25.1–28.9 V min–max at 5 mA - defines stable clamping point for overvoltage protection |
| Power Dissipation | 225 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance | 80 Ω max at 5 mA - determines voltage regulation stability under varying load current |
| Reverse Leakage | 0.05 µA max at 20.3 V - ensures minimal standby current in high-impedance bias networks |
| Temperature Coefficient | +18.9 mV/°C at 5 mA - quantifies voltage drift per degree Celsius rise in ambient temperature |
| Capacitance | 70 pF max at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - enables robust handling in manual assembly and end-user environments |
Pinout & Package
SOT-23 surface-mount package (Case 318, Style 8), 3-pin configuration with pin 2 internally unconnected. Dimensions: 2.80–3.04 mm length, 1.20–1.40 mm width, 0.99–1.26 mm height. Corrosion-resistant finish, UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 | No Connection | Internally isolated; must remain unconnected on PCB to avoid malfunction |
| 3 | Cathode | Reverse-biased terminal; connects to regulated output or voltage reference node |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Option Available | RoHS-compliant packaging (G-suffix variants) supports environmental compliance without performance trade-off |
| Optimized for Automated Assembly | Standardized SOT-23 footprint and polarity band enable reliable pick-and-place placement |
| Tight Thermal Resistance Control | 556 °C/W junction-to-ambient on FR-5 ensures predictable thermal behavior in dense layouts |
| High-Density Footprint | Small 2.8 × 1.2 mm outline allows placement in compact mobile PCBs with >1000 components/in² |
| Stable Zener Voltage Tolerance | ±5% tolerance group (C-series) balances cost and precision for non-critical reference applications |
Applications
| Cellular Phone Power Management | Handheld Portable Device Protection |
|---|---|
Use Scenario: Clamping transient spikes on battery input rail during hot-swap or charger insertion. IC Role / Device Role / Timing Role: Voltage regulator and overvoltage protector placed between Li-ion battery and PMIC input. Use Value: Limits voltage to ≤28.9 V under surge, preventing damage to downstream 3.3 V/5 V logic and analog circuitry. | Use Scenario: Providing stable reference for ADC biasing in portable medical sensors. IC Role / Device Role / Timing Role: Precision voltage reference source for 12-bit SAR ADC front-end calibration. Use Value: Delivers 27 V reference with <±0.5 V drift over −20°C to +70°C, enabling accurate sensor scaling. |
| High-Density PC Board Regulation | ESD-Sensitive Interface Protection |
Use Scenario: Local regulation for FPGA I/O bank supply in multi-rail embedded systems. IC Role / Device Role / Timing Role: Secondary Zener shunt regulator stabilizing 2.5 V auxiliary rail derived from switching converter. Use Value: Compensates for ±5% converter tolerance and load-induced droop, maintaining <1% output variation. | Use Scenario: Input-stage clamping for USB 2.0 data lines exposed to user-accessible ports. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting PHY transceiver pins from ESD events. Use Value: Withstands >16 kV HBM strikes while adding only 70 pF capacitance, preserving signal integrity up to 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5256BLT1 | 27 V nominal, ±5%, 225 mW, SOT-23, but higher Zz (100 Ω @ 20 mA) and lower ESD rating (Class 2) | Less stable regulation under dynamic load; unsuitable for high-reliability ESD-prone interfaces | Select when cost is primary constraint and ESD immunity >16 kV is not required |
| BZX84C27LT1G | Identical electrical specs and SOT-23 package; Pb-free construction (G-suffix) vs. standard leaded version | No functional difference; differs only in RoHS compliance and soldering profile compatibility | Select for RoHS-compliant production; same layout, no redesign needed |
Compared with BZX84C27LT3, MMBZ5256BLT1 offers lower cost but sacrifices ESD robustness and regulation tightness, while BZX84C27LT1G delivers identical performance with lead-free compliance - making it ideal for environmentally regulated manufacturing without layout change.
Availability
BZX84C27LT3 is available at Aetrix Electronics and suitable for cellular phone power management, handheld portable device protection, and high-density PC board regulation requiring stable component supply across volume production cycles.
Supply support for BZX84C27LT3 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 BZX84C27LT3 belongs to the BZX84CxxxLT1 Zener regulator family, designed specifically for low-power, space-constrained voltage reference and overvoltage protection in portable and high-density electronics.
FAQ
What is the Zener voltage tolerance of the BZX84C27LT3?
The BZX84C27LT3 has a nominal Zener voltage of 27 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 25.1 V and 28.9 V when tested at 5 mA. This tolerance is defined per the "C-series" designation in the BZX84 family and is verified under standard conditions (TA = 25°C, pulse test). The BZX84C27LT3 maintains this specification across its qualified operating temperature range.
Does the BZX84C27LT3 have a connected pin 2?
No, pin 2 of the BZX84C27LT3 is internally unconnected (NC) and must remain unconnected on the PCB layout. The device uses only pins 1 (anode) and 3 (cathode) for operation. This configuration is explicitly confirmed in the Electrical Characteristics table and Package Dimensions diagram of the official onsemi datasheet for the BZX84C27LT3.
What is the maximum reverse leakage current for the BZX84C27LT3?
The BZX84C27LT3 specifies a maximum reverse leakage current (IR) of 0.05 µA at VR = 20.3 V (75% of nominal Zener voltage), measured at TA = 25°C. This value is critical for low-power bias networks where standby current must be minimized. Leakage remains below this limit across the full storage temperature range (−65°C to +150°C), as validated in the device's qualification testing.
Can the BZX84C27LT3 be used in high-frequency applications?
The BZX84C27LT3 exhibits a maximum junction capacitance of 70 pF at 0 V bias and 1 MHz, making it suitable for low-to-moderate frequency applications such as DC voltage clamping and reference generation. However, its 70 pF capacitance and 80 Ω dynamic impedance limit use in >10 MHz signal paths; for RF coupling or fast transient suppression, lower-capacitance alternatives like the MMBZ5256BLT1 (50 pF) may be preferred.
Is the BZX84C27LT3 RoHS-compliant?
The BZX84C27LT3 is not inherently RoHS-compliant; it is the standard leaded version. For RoHS compliance, the manufacturer offers the BZX84C27LT1G variant (Pb-free, green molding compound). Both share identical electrical specifications and SOT-23 mechanical form factor, but only the G-suffix part meets EU RoHS Directive 2011/65/EU requirements for restricted substances.
BZX84C27LT3 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):
- 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)
BZX84C27LT3 FAQ
1.How can I place an order for BZX84C27LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C27LT3 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 BZX84C27LT3 reliable?
The price and inventory of BZX84C27LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C27LT3 is usually 5 days.
3.What payment methods are accepted for BZX84C27LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C27LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C27LT3?
BZX84C27LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C27LT3 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 BZX84C27LT3?
For technical support, including BZX84C27LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C27LT3 requirements.
6.How does Aetrix verify that BZX84C27LT3 is sourced from the original manufacturer or authorized distributors?
All BZX84C27LT3 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 BZX84C27LT3 meets industry standards.
7.What is the process for return or replacement of BZX84C27LT3?
All BZX84C27LT3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C27LT3, 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 BZX84C27LT3 part is unused and in its original packaging.
Return procedure for BZX84C27LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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