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onsemi SZBZX84C12ET1G
- Part No.:
- SZBZX84C12ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C12ET1G.pdf
- Description:
- DIODE ZENER 12V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:22,835
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Product details
Overview
SZBZX84C12ET1G from onsemi is a 12 V, 250 mW surface-mount Zener diode in SOT-23 package, with nominal Zener voltage 12.0 V @ 5 mA, dynamic impedance 25 Ω @ 5 mA, and reverse leakage current ≤0.1 μA @ 9.6 V. It provides precision voltage regulation for low-power biasing, reference, and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZBZX84C12ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±0.7 V), temperature coefficient (+6.0 mV/°C), junction-to-ambient thermal resistance (500 °C/W on FR-5), ESD rating (>16 kV HBM), and automotive qualification per AEC-Q101.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its cathode-anode terminals. Its Zener mechanism delivers regulated output under reverse bias, with specified test conditions at TA = 25 °C and pulse-tested IZT = 5 mA.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), enabling unidirectional clamping and DC voltage referencing. Thermal performance is defined for FR-5 board mounting, with derating above 25 °C at 2.0 mW/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 12.0 V nominal @ 5 mA - sets precise regulation point for reference or clamp circuits |
| Power Rating | 250 mW on FR-5 board - defines maximum continuous dissipation without forced cooling |
| Zener Impedance | 25 Ω @ 5 mA - determines output voltage stability under load variation |
| Reverse Leakage | ≤0.1 μA @ 9.6 V - ensures minimal quiescent current in standby or high-impedance nodes |
| Temp Coefficient | +6.0 mV/°C @ 5 mA - quantifies voltage drift over industrial temperature range (−65 to +150 °C) |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated assembly and end-use environments |
| Capacitance | 130 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail when used in shunt regulation |
| 2 (No Connection) | Internally unconnected | No electrical function; must remain floating-no PCB trace or pad required |
| 3 (Cathode) | Zener breakdown terminal / regulated output node | Connected to input supply via current-limiting resistor; delivers stable 12 V to load |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Pb-free & RoHS compliant | Meets global environmental compliance requirements for industrial and consumer production |
| Peak pulse power | 225 W (8 × 20 μs) - enables transient overvoltage suppression without failure |
| Small footprint | 0.0037 in² board area - supports high-density layout in smartphones and wearables |
| Optimized for automation | Transfer-molded case geometry ensures reliable pick-and-place and reflow soldering yield |
Applications
| Portable Power Management | Automotive Sensor Biasing |
|---|---|
Use Scenario: Regulating reference voltage for ADCs and LDOs in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 12 V to analog front-end circuitry. Use Value: Maintains <±1% voltage accuracy across −40 to +85 °C ambient, ensuring consistent sensor calibration. | Use Scenario: Supplying bias voltage to Hall-effect position sensors in EPS and throttle actuators. IC Role / Device Role / Timing Role: Precision voltage clamp protecting sensor IC inputs from load-dump transients. Use Value: Withstands 225 W peak pulses and meets AEC-Q101 stress testing for 15-year vehicle lifetime. |
| Industrial PLC Input Protection | Consumer Audio DC Reference |
Use Scenario: Overvoltage clamping on 24 V digital input channels of programmable logic controllers. IC Role / Device Role / Timing Role: Fast-response shunt limiter diverting surge energy away from microcontroller GPIOs. Use Value: 16 kV HBM ESD rating prevents field failures during maintenance or cable hot-plug events. | Use Scenario: Generating clean 12 V reference for op-amp gain-setting networks in headphone amplifiers. IC Role / Device Role / Timing Role: Low-noise DC voltage source minimizing hum and distortion in audio signal paths. Use Value: 130 pF capacitance and <0.1 μA leakage preserve high-impedance node integrity and SNR >105 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C12ET1G | No AEC-Q101 qualification; same Zener voltage, impedance, and package | Not approved for automotive use; suitable for commercial-grade consumer or industrial designs | Select when automotive qualification is not required and cost sensitivity is higher |
| MMSZ4685T1G | 12 V nominal but tighter tolerance (±5%), higher ZZT (30 Ω), lower power (350 mW on FR-4) | Higher precision but less thermal margin; optimized for general-purpose regulation over wide temperature | Choose when tighter voltage tolerance outweighs automotive compliance and pulse robustness |
Compared with SZBZX84C12ET1G, BZX84C12ET1G lacks automotive qualification yet matches core regulation specs, while MMSZ4685T1G trades AEC-Q101 compliance for tighter initial tolerance and higher power rating-making each suitable for distinct reliability or precision priorities.
Availability
SZBZX84C12ET1G is available at Aetrix Electronics and suitable for portable power management, automotive sensor biasing, industrial PLC input protection, and consumer audio DC reference requiring stable component supply and long-term lifecycle support.
Supply support for SZBZX84C12ET1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84CxxxET1G/SZBZX84CxxxET1G series targets compact, reliable voltage regulation in high-density PCBs-designed specifically for portable electronics, automotive subsystems, and industrial controls where space, robustness, and regulatory compliance are critical.
FAQ
What is the Zener voltage tolerance of SZBZX84C12ET1G at 5 mA test current?
The SZBZX84C12ET1G has a Zener voltage range of 11.4 V to 12.7 V at IZT = 5 mA, corresponding to ±0.7 V absolute tolerance or ±5.8% relative tolerance around the nominal 12.0 V value. This specification is measured under standard conditions (TA = 25 °C) and defines the guaranteed regulation window for design margining in precision reference applications.
Is SZBZX84C12ET1G suitable for automotive applications?
Yes, SZBZX84C12ET1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls, site-specific change management, and extended reliability validation beyond commercial-grade BZX84C12ET1G.
What is the thermal resistance of SZBZX84C12ET1G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZBZX84C12ET1G is 500 °C/W when mounted on FR-5 board at TA = 25 °C. This value decreases linearly with derating-2.0 mW/°C above 25 °C-enabling accurate thermal modeling for sustained operation up to +150 °C junction temperature.
How is the pinout configured for SZBZX84C12ET1G in SOT-23 package?
SZBZX84C12ET1G uses Style 8 pinout: pin 1 is anode, pin 2 is no connection (NC), and pin 3 is cathode. The cathode is marked by a polarity band on the package body. Pin 2 must remain unconnected on PCB-no trace or pad should be routed to it-to ensure correct device operation and avoid unintended parasitic paths.
What is the maximum reverse leakage current for SZBZX84C12ET1G at 9.6 V?
The maximum reverse leakage current for SZBZX84C12ET1G is 0.1 μA at VR = 9.6 V and TA = 25 °C. This low leakage ensures minimal power loss in high-impedance bias networks and preserves accuracy in precision reference circuits where loading effects must be minimized.
SZBZX84C12ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84C12ET1G FAQ
1.How can I place an order for SZBZX84C12ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C12ET1G 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 SZBZX84C12ET1G reliable?
The price and inventory of SZBZX84C12ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C12ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C12ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C12ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C12ET1G?
SZBZX84C12ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C12ET1G 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 SZBZX84C12ET1G?
For technical support, including SZBZX84C12ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C12ET1G requirements.
6.How does Aetrix verify that SZBZX84C12ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C12ET1G 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 SZBZX84C12ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C12ET1G?
All SZBZX84C12ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C12ET1G, 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 SZBZX84C12ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C12ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C12ET1G Tags
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