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onsemi BZX84C12LT3G
- Part No.:
- BZX84C12LT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C12LT3G.pdf
- Description:
- DIODE ZENER 12V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,918
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Product details
Overview
BZX84C12LT3G from onsemi is a 12 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 25 Ω dynamic impedance at 5 mA test current and 0.1 μA reverse leakage at 9.4 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C12LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient (+6.0 mV/°C), junction temperature range (−65°C to +150°C), and Pb-free SOT-23 packaging compatible with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference using controlled reverse-biased avalanche breakdown. Its Zener voltage is specified at three test currents (1 mA, 5 mA, and 20 mA), enabling stable regulation across varying load conditions.
The BZX84C12LT3G exhibits a positive temperature coefficient of +6.0 mV/°C at 5 mA, low capacitance (130 pF at 0 V, 1 MHz), and ESD robustness exceeding 16 kV per Human Body Model-critical for handheld and high-density PCB applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 12 V nominal, 11.4–12.7 V range at 5 mA - defines regulated output voltage under standard bias |
| Power Dissipation | 250 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance | 25 Ω max at 5 mA - determines regulation stiffness and output voltage variation under load changes |
| Reverse Leakage | 0.1 μA max at 9.4 V - ensures minimal quiescent current in standby or low-power modes |
| Temperature Coefficient | +6.0 mV/°C at 5 mA - quantifies voltage drift over operating temperature range |
| Capacitance | 130 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling during automated assembly and end-user operation |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry point; connected to lower-potential node in regulation circuit |
| 2 | No Connection | Internally unconnected terminal; must remain floating in PCB layout |
| 3 | Cathode | Zener breakdown terminal; connected to higher-potential node and regulation output |
Key Features
| Feature | Design Value |
|---|---|
| 250 mW Power Rating | Enables compact voltage clamping without heatsinking on standard FR-5 PCBs |
| ±5% Zener Tolerance | Supports cost-sensitive designs where tight regulation is not required but predictable thresholding is essential |
| 16 kV HBM ESD Robustness | Eliminates need for external ESD protection in consumer handheld interfaces |
| Pb-Free SOT-23 Packaging | Ensures compliance with global environmental directives and compatibility with lead-free reflow profiles |
| −65°C to +150°C Operating Range | Validates use in automotive under-hood and industrial control environments without derating |
Applications
| Overvoltage Protection | Reference Voltage Source |
|---|---|
Use Scenario: Clamping transient surges on I/O lines of battery-powered sensors. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy above 12 V threshold. Use Value: Prevents damage to downstream logic with 0.1 μA leakage and fast response to 100 ns transients. |
Use Scenario: Providing stable 12 V reference for ADC biasing in portable medical monitors. IC Role / Device Role / Timing Role: Precision voltage reference with +6.0 mV/°C TC and 25 Ω impedance. Use Value: Maintains <±1% reference stability across −20°C to +70°C ambient without active compensation. |
| Power Supply Regulation | Signal Level Shifting |
Use Scenario: Regulating auxiliary 12 V rail in multi-rail DC-DC converter outputs. IC Role / Device Role / Timing Role: Low-power shunt regulator trimming output voltage in feedback loop. Use Value: Delivers 250 mW dissipation margin while maintaining ±5% accuracy under 5–20 mA load variation. |
Use Scenario: Biasing optocoupler input LEDs in isolated communication interfaces. IC Role / Device Role / Timing Role: Fixed-voltage clamp defining logic-high threshold for digital signal translation. Use Value: Ensures consistent 12 V switching point across temperature with negligible capacitance-induced delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C12LT1G | Same electrical specs but supplied in 3,000-piece tape-and-reel vs. 10,000-piece for BZX84C12LT3G | Identical performance; suited for prototyping or low-volume production runs | Select when smaller reel size aligns with SMT line changeover frequency or inventory turnover targets |
| BZX84B12LT1G | Tighter ±2% Zener tolerance (11.8–12.2 V), same 25 Ω impedance and +6.0 mV/°C TC | Higher precision required in analog sensor conditioning or calibration-critical circuits | Choose when voltage accuracy outweighs cost sensitivity and tighter tolerance justifies premium pricing |
Compared with BZX84C12LT3G, the BZX84C12LT1G offers identical regulation performance in smaller packaging volume, while BZX84B12LT1G trades wider tolerance for improved absolute accuracy-enabling optimization between cost, precision, and supply-chain scale.
Availability
BZX84C12LT3G is available at Aetrix Electronics and suitable for cellular phone power management, handheld portable voltage clamping, and high-density PC board reference design requiring stable component supply and full traceability.
Supply support for BZX84C12LT3G 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 BZX84CxxxLTxG series is part of onsemi's broad portfolio of discrete Zener regulators designed specifically for space-constrained, high-reliability voltage reference and overvoltage protection in portable and embedded systems.
FAQ
What is the Zener voltage tolerance of BZX84C12LT3G?
The BZX84C12LT3G has a nominal Zener voltage of 12 V with a tolerance of ±5%, meaning its actual breakdown voltage falls within 11.4 V to 12.7 V when tested at 5 mA. This tolerance is defined per the BZX84Cxxx standard series and confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.
Does BZX84C12LT3G have a built-in capacitor or require external bypassing?
No, the BZX84C12LT3G is a discrete Zener diode with no integrated capacitor. Its junction capacitance is 130 pF at 0 V and 1 MHz, which is inherent to the PN junction. External bypassing is optional and depends on application noise requirements-not a functional necessity for basic voltage regulation.
Can BZX84C12LT3G be used in automotive applications?
The BZX84C12LT3G itself is not AEC-Q101 qualified; however, the SZBZX84C12LT3G variant (with SZ prefix) is automotive-grade, AEC-Q101 qualified, and PPAP capable. For non-automotive industrial or consumer use, BZX84C12LT3G meets all standard reliability and environmental requirements including −65°C to +150°C operation.
What is the maximum power dissipation of BZX84C12LT3G on an FR-5 board?
The BZX84C12LT3G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 2.0 mW/°C, reaching zero dissipation capability at 150°C junction temperature per the Maximum Ratings table on page 2 of the datasheet.
How is the polarity marked on the BZX84C12LT3G SOT-23 package?
The BZX84C12LT3G uses standard SOT-23 polarity marking: the cathode is indicated by a visible band on the package body, aligned with pin 3. Pin 1 is the anode, pin 2 is internally unconnected, and pin 3 is the cathode-confirmed in the Marking Diagram and Mechanical Characteristics section of the datasheet.
BZX84C12LT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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)
BZX84C12LT3G FAQ
1.How can I place an order for BZX84C12LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C12LT3G 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 BZX84C12LT3G reliable?
The price and inventory of BZX84C12LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C12LT3G is usually 5 days.
3.What payment methods are accepted for BZX84C12LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C12LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C12LT3G?
BZX84C12LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C12LT3G 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 BZX84C12LT3G?
For technical support, including BZX84C12LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C12LT3G requirements.
6.How does Aetrix verify that BZX84C12LT3G is sourced from the original manufacturer or authorized distributors?
All BZX84C12LT3G 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 BZX84C12LT3G meets industry standards.
7.What is the process for return or replacement of BZX84C12LT3G?
All BZX84C12LT3G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C12LT3G, 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 BZX84C12LT3G part is unused and in its original packaging.
Return procedure for BZX84C12LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C12LT3G Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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