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onsemi SZBZX84B12LT1G
- Part No.:
- SZBZX84B12LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84B12LT1G.pdf
- Description:
- DIODE ZENER 12V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,975
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Product details
Overview
SZBZX84B12LT1G from onsemi is a 12 V ±1.7% tight-tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C, with 25 Ω dynamic impedance at 5 mA test current and 0.1 μA reverse leakage at 9.6 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and power rail stabilization circuits.
For engineers reviewing the SZBZX84B12LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±1.7%), thermal coefficient (+6 mV/°C), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage-regulating diode with cathode-anode polarity, designed for stable reverse-bias breakdown at precisely 12 V under 5 mA test current. Its tight 1.7% tolerance (11.8–12.2 V) and low temperature coefficient (+6 mV/°C) enable accurate voltage referencing across −65°C to +150°C junction range.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), supporting automated placement and reflow soldering per JEDEC J-STD-020. Thermal resistance is 500°C/W on FR-5 board, limiting continuous power handling without derating above 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 12.0 V nominal, 11.8–12.2 V min/max at 5 mA - enables precise 12 V rail clamping or reference generation |
| Power Dissipation | 250 mW on FR-5 board at 25°C - supports low-power biasing without heatsinking |
| Zener Impedance | 25 Ω max at 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage | 0.1 μA max at 9.6 V - maintains high impedance in standby, minimizing quiescent current draw |
| Temperature Coefficient | +6.0 mV/°C at 5 mA - provides predictable voltage drift for compensated designs |
| Capacitance | 130 pF max at 0 V, 1 MHz - suitable for DC/low-frequency regulation, not RF filtering |
| ESD Rating | Class 3 (>16 kV) per HBM - withstands handling and board-level electrostatic discharge |
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, UL 94 V-0 flammability rating, and cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally unconnected; must remain floating on PCB layout |
| 3 | Cathode | Connected to higher-potential node; defines regulated output voltage node |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±1.7% (11.8–12.2 V) - reduces need for post-production calibration in precision references |
| Automated assembly support | SOT-23 package with standardized tape-and-reel (3,000 pcs) - compatible with high-speed pick-and-place equipment |
| Pb-free & RoHS compliance | Meets EU RoHS Directive 2011/65/EU and AEC-Q101 qualification - approved for automotive and industrial use |
| High ESD immunity | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in portable electronics |
| Low leakage performance | 0.1 μA max at 9.6 V - preserves battery life in always-on sensor nodes and IoT edge devices |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Two-terminal Zener regulator providing fixed 12 V reference to op-amp bias network. Use Value: Tight 1.7% tolerance ensures <±2 LSB error contribution at full-scale, eliminating trimming resistors. |
Use Scenario: Clamping VBUS overvoltage during hot-plug events in USB-C accessory ports. IC Role / Device Role / Timing Role: Passive shunt protector activated above 12.2 V to divert surge current away from downstream PMIC. Use Value: 250 mW rating sustains 100 ms overvoltage pulses without degradation; SOT-23 footprint fits narrow board margins. |
| Automotive Cabin Control Panel | Medical Wearable Battery Monitor |
Use Scenario: Regulating 12 V supply rail for microcontroller I/O logic in HVAC control modules. IC Role / Device Role / Timing Role: Zener-based local voltage clamp protecting MCU GPIO against load-dump transients. Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability across vehicle lifetime and ambient extremes. |
Use Scenario: Providing stable reference for lithium-ion cell voltage measurement in patch-style ECG monitors. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) Zener reference enabling >5-year shelf life in battery-powered devices. Use Value: 130 pF capacitance avoids signal coupling into sensitive analog front-end; Pb-free construction meets medical material restrictions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84B12LT1G | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and PPAP capability | Not approved for automotive ECUs or safety-critical subsystems | Select when cost sensitivity outweighs automotive compliance requirements |
| SZBZX84B12LT3G | Identical electrical and mechanical specs; differs only in packaging (10,000 pcs/reel vs. 3,000) | No functional difference; suited for high-volume production runs | Choose for large-batch manufacturing where reel size impacts line efficiency |
Compared with BZX84B12LT1G and SZBZX84B12LT3G, the SZBZX84B12LT1G uniquely combines automotive-grade qualification, smaller tape-and-reel quantity for prototyping, and identical Zener performance-making it optimal for Tier 1 validation and low-to-mid volume production.
Availability
SZBZX84B12LT1G is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power clamping, automotive cabin controls, and medical wearable battery monitoring requiring stable component supply and long-term lifecycle support.
Supply support for SZBZX84B12LT1G 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 silicon and SiC solutions for automotive, industrial, cloud, and IoT markets.
SZBZX84B12LT1G belongs to the SZBZX84BxxxLT1G automotive-qualified Zener series, engineered for precision voltage regulation in harsh environments where reliability, tight tolerance, and AEC-Q101 compliance are mandatory.
FAQ
What is the exact Zener voltage tolerance of SZBZX84B12LT1G at 5 mA test current?
The SZBZX84B12LT1G has a guaranteed Zener voltage range of 11.8 V to 12.2 V at 5 mA test current, corresponding to ±1.7% tolerance around the nominal 12.0 V value. This tight specification is confirmed in the "BZX84BxxxL (Tight Tolerance Series)" table on page 4 of the official onsemi datasheet, and applies specifically to the SZBZX84B12LT1G variant.
Does SZBZX84B12LT1G have a functional pin 2, and what is its role?
No, pin 2 of the SZBZX84B12LT1G is internally unconnected (NC) and must remain floating on the PCB layout. The device uses only pins 1 (anode) and 3 (cathode) for operation, as explicitly defined in the "Mechanical Characteristics" section and pinout diagrams (Style 8) of the onsemi datasheet. Connecting pin 2 may compromise reliability.
Is SZBZX84B12LT1G qualified for automotive applications, and what standard does it meet?
Yes, SZBZX84B12LT1G is AEC-Q101 qualified and PPAP capable, as stated in the "Features" section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, confirming its suitability for under-hood and cabin control modules meeting automotive quality and traceability standards.
What is the maximum reverse leakage current for SZBZX84B12LT1G, and at what voltage is it specified?
The maximum reverse leakage current for SZBZX84B12LT1G is 0.1 μA, measured at VR = 9.6 V (80% of nominal Zener voltage), per the "ELECTRICAL CHARACTERISTICS − BZX84BxxxL" table on page 4 of the onsemi datasheet. This low leakage supports ultra-low-power operation in battery-backed systems.
Can SZBZX84B12LT1G be used in place of BZX84C12LT1G in a design?
No-SZBZX84B12LT1G and BZX84C12LT1G differ significantly in tolerance: the "B" series offers ±1.7% (11.8–12.2 V), while the "C" series has ±5% (11.4–12.7 V). Substituting without circuit review risks overvoltage stress or insufficient clamping. Their shared SOT-23 package and pinout do not imply functional interchangeability.
SZBZX84B12LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZBZX84BxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±2%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84B12LT1G FAQ
1.How can I place an order for SZBZX84B12LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84B12LT1G 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 SZBZX84B12LT1G reliable?
The price and inventory of SZBZX84B12LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84B12LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84B12LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84B12LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84B12LT1G?
SZBZX84B12LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84B12LT1G 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 SZBZX84B12LT1G?
For technical support, including SZBZX84B12LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84B12LT1G requirements.
6.How does Aetrix verify that SZBZX84B12LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84B12LT1G 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 SZBZX84B12LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84B12LT1G?
All SZBZX84B12LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84B12LT1G, 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 SZBZX84B12LT1G part is unused and in its original packaging.
Return procedure for SZBZX84B12LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84B12LT1G Tags
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