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onsemi BZX84C12ET1
- Part No.:
- BZX84C12ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C12ET1.pdf
- Description:
- DIODE ZENER 12V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,546
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Product details
Overview
BZX84C12ET1 from onsemi is a 12 V, 225 mW surface-mount Zener diode in SOT-23 package, rated for 10 µA reverse leakage at 9.4 V, with dynamic impedance of 25 Ω at 5 mA and temperature coefficient of +6.0 mV/°C - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the BZX84C12ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.8% at 12 V), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), peak pulse power (225 W), and Pb-free SOT-23 compatibility with automated assembly.
Technical Context
The BZX84C12ET1 operates as a two-terminal voltage regulator via controlled reverse breakdown, with nominal Zener voltage specified at 5 mA test current (11.4–12.7 V), and exhibits positive temperature coefficient (+6.0 mV/°C) above ~5 V, enabling stable biasing across −65°C to +150°C junction range.
Its SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with thermal performance defined for FR-5 board (225 mW derated at 1.8 mW/°C above 25°C) and alumina substrate (300 mW derated at 2.4 mW/°C), supporting high-density PCB layouts in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.7 V @ IZT = 5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25°C - sets maximum continuous DC power handling in typical PCB environment |
| Zener Impedance (ZZT) | 25 Ω @ IZT = 5 mA - determines AC regulation stiffness and ripple rejection capability |
| Reverse Leakage (IR) | 0.1 µA @ VR = 9.4 V - specifies off-state current that impacts low-power standby accuracy |
| Temperature Coefficient | +6.0 mV/°C @ IZT = 5 mA - quantifies voltage drift per degree, critical for temperature-stable references |
| Capacitance (C) | 130 pF @ VR = 0 V, f = 1 MHz - affects high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - ensures robustness against human-handling electrostatic discharge during assembly |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with void-free thermosetting plastic case, corrosion-resistant finish, UL 94 V-0 flammability rating, and maximum soldering temperature of 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry point; reverse-biased during Zener operation |
| 2 | No Connection | Internally unconnected terminal - must remain floating, not tied to ground or supply |
| 3 | Cathode | Reverse-bias voltage reference node; marked by polarity band on package |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage clamping without heatsinking in consumer-grade PCBs |
| ESD rating >16 kV (HBM) | Eliminates need for external ESD protection in handheld device front-end circuits |
| Pb-free SOT-23 packaging | Complies with RoHS and JEDEC J-STD-020 reflow profiles for lead-free manufacturing |
| Small footprint (2.9 × 1.3 × 1.0 mm) | Supports ≥1000 components/in² density on mobile phone mainboards and wearables |
| −65°C to +150°C operating range | Validates use in automotive cabin modules and industrial sensor nodes without derating |
Applications
| Portable Power Rail Clamping | Low-Power Reference Generation |
|---|---|
Use Scenario: Protecting 12 V LDO input in Bluetooth headset charging circuit from transient surges. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy above 12 V threshold. Use Value: Limits voltage excursion to ≤12.7 V with <0.1 µA leakage, preserving battery runtime and IC reliability. |
Use Scenario: Providing stable 12 V bias for op-amp comparator in smart thermostat sensor interface. IC Role / Device Role / Timing Role: Precision DC voltage reference with +6.0 mV/°C TC compensated by system calibration. Use Value: Delivers ±5.8% initial tolerance and <25 Ω dynamic impedance for sub-1% reference stability over 0–70°C. |
| ESD-Sensitive Interface Protection | Density-Constrained Board Regulation |
Use Scenario: Safeguarding USB data lines in portable medical monitor against contact discharge events. IC Role / Device Role / Timing Role: Low-capacitance (130 pF) clamp limiting line voltage to 12.7 V during ESD transients. Use Value: Withstands >16 kV HBM without degradation, avoiding signal distortion from excessive Cj. |
Use Scenario: Regulating auxiliary 12 V rail on 6-layer smartphone baseband module with <0.5 mm trace spacing. IC Role / Device Role / Timing Role: Space-optimized shunt regulator occupying only 0.0037 in² PCB area in SOT-23. Use Value: Achieves 225 mW dissipation within thermal limits while fitting between BGA pads on high-I/O SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242BS-7-F | 12 V nominal, 350 mW rating, SOD-123 package, 30 Ω ZZT @ 20 mA | Larger footprint (3.7 × 1.6 mm), higher power, but lower density suitability | Select when higher surge energy absorption (350 mW) outweighs PCB area constraints |
| BZX84-C12LT1G | Identical electrical specs, same SOT-23 package, but marked "LT1G" instead of "ET1G" - alternate ordering code from same onsemi production line | No functional or layout difference; identical pinout, thermal, and reliability behavior | Use as direct logistics alternative when BZX84C12ET1 is backordered; no design change required |
Compared with MMBZ5242BS-7-F, the BZX84C12ET1 offers superior board-area efficiency and tighter Zener tolerance (±5.8% vs ±8.3%), while BZX84-C12LT1G provides identical performance with alternate tape-and-reel packaging - making BZX84C12ET1 optimal for high-density, cost-sensitive portable designs requiring verified 225 mW operation.
Availability
BZX84C12ET1 is available at Aetrix Electronics and suitable for portable power rail clamping, low-power reference generation, ESD-sensitive interface protection, and density-constrained board regulation requiring stable component supply and full RoHS compliance.
Supply support for BZX84C12ET1 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The BZX84C12ET1 belongs to the BZX84CxxxET1 series of Zener regulators designed specifically for space-constrained, high-reliability voltage reference and transient suppression in battery-powered portable electronics.
FAQ
What is the Zener voltage tolerance of BZX84C12ET1 at 5 mA test current?
The BZX84C12ET1 has a Zener voltage range of 11.4 V to 12.7 V at IZT = 5 mA, corresponding to a ±5.8% tolerance around the nominal 12 V rating. This specification is measured under TA = 25°C per the official onsemi datasheet Rev. 6, and applies directly to the BZX84C12ET1 without interpolation or family-level assumption.
Can BZX84C12ET1 be used in place of BZX84-C12LT1G?
Yes - BZX84C12ET1 and BZX84-C12LT1G are functionally identical parts from onsemi, sharing the same electrical characteristics, SOT-23 package, pinout (1-Anode, 2-NC, 3-Cathode), and thermal performance. The "ET1" and "LT1" suffixes reflect different tape-and-reel ordering codes, not design revisions; the BZX84C12ET1 may be substituted without layout or firmware changes.
What is the maximum reverse leakage current for BZX84C12ET1 and at what voltage is it specified?
The BZX84C12ET1 exhibits a maximum reverse leakage current of 0.1 µA at VR = 9.4 V, as confirmed in the Electrical Characteristics table of the onsemi datasheet. This value is measured at TA = 25°C and defines the upper bound of off-state conduction when the device is biased below its Zener knee, critical for ultra-low-power sleep-mode designs.
Does BZX84C12ET1 have a connected pin 2, and what is its function?
No - pin 2 of the BZX84C12ET1 is internally not connected (NC), as explicitly stated in the datasheet's pinout diagram and mechanical drawings. It must remain unconnected on the PCB; routing it to ground, supply, or any other net violates the device's internal construction and may impair Zener regulation performance or cause premature failure.
What is the thermal resistance junction-to-ambient for BZX84C12ET1 on FR-5 board?
The BZX84C12ET1 has a thermal resistance of 556 °C/W junction-to-ambient when mounted on FR-5 board, per the Maximum Ratings table. This value governs temperature rise under continuous DC power dissipation (e.g., 225 mW → ΔT ≈ 125°C above ambient), and must be applied with the 1.8 mW/°C derating factor above 25°C ambient for reliable long-term operation of the BZX84C12ET1.
BZX84C12ET1 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:
- 225 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)
BZX84C12ET1 FAQ
1.How can I place an order for BZX84C12ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C12ET1 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 BZX84C12ET1 reliable?
The price and inventory of BZX84C12ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C12ET1 is usually 5 days.
3.What payment methods are accepted for BZX84C12ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C12ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C12ET1?
BZX84C12ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C12ET1 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 BZX84C12ET1?
For technical support, including BZX84C12ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C12ET1 requirements.
6.How does Aetrix verify that BZX84C12ET1 is sourced from the original manufacturer or authorized distributors?
All BZX84C12ET1 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 BZX84C12ET1 meets industry standards.
7.What is the process for return or replacement of BZX84C12ET1?
All BZX84C12ET1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C12ET1, 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 BZX84C12ET1 part is unused and in its original packaging.
Return procedure for BZX84C12ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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