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onsemi SZBZX84C12LT1
- Part No.:
- SZBZX84C12LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C12LT1.pdf
- Description:
- DIODE ZENER 12V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:54,000
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Product details
Overview
SZBZX84C12LT1 from onsemi is a 12 V ±5.8% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 25 Ω dynamic impedance at 5 mA test current and 0.1 µA reverse leakage at 9.4 V, used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C12LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5.8%), thermal coefficient (+6.0 mV/°C), ESD robustness (>16 kV HBM), SOT-23 footprint compatibility, and AEC-Q101 qualification status.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across its cathode-anode terminals under varying load and input conditions. It exhibits a positive temperature coefficient of +6.0 mV/°C at 5 mA, enabling predictable drift compensation in temperature-sensitive references.
Zener breakdown occurs at 11.4–12.7 V with 5 mA test current, and dynamic impedance remains ≤25 Ω - critical for low-noise regulation in battery-powered sensor nodes and LDO feedback paths. The SOT-23 package supports automated placement and delivers 556 °C/W junction-to-ambient thermal resistance on standard PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.7 V @ IZT = 5 mA - defines regulated output range for 12 V rail clamping |
| Power Dissipation | 225 mW @ TA = 25°C on FR-5 - sets maximum continuous power handling without derating |
| Zener Impedance (ZZT) | ≤25 Ω @ IZT = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current | ≤0.1 µA @ VR = 9.4 V - guarantees low standby current in always-on circuits |
| Temperature Coefficient | +6.0 mV/°C @ IZT = 5 mA - enables accurate thermal drift modeling in reference designs |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robust handling during board assembly and field operation |
| Junction Temp Range | −65°C to +150°C - supports automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 surface-mount plastic package (Case 318, Style 8), void-free thermosetting epoxy, corrosion-resistant finish, UL 94 V-0 flammability rating, 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; forward-biased during normal conduction |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to regulated voltage node; Zener breakdown occurs between Pin 3 and Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 Power Rating | Enables compact voltage clamping without heatsinking in space-constrained hand-held PCBs |
| AEC-Q101 Qualified | Validated for automotive electronics including infotainment power supervisors and body control modules |
| Pb-Free (G-suffix compatible) | Meets RoHS and ELV directives; compatible with lead-free reflow profiles up to 260°C |
| Tight Thermal Coefficient Control | +6.0 mV/°C allows predictable offset correction in temperature-compensated reference circuits |
| High-Density SOT-23 Footprint | 0.95 mm × 1.30 mm body with 1.90 mm pin pitch - fits 0402-class layout density |
Applications
| Smartphone Power Rail Protection | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients in smartphone PMIC input stage. IC Role / Device Role / Timing Role: Shunt Zener regulator providing overvoltage protection and stable bias for LDO error amplifier. Use Value: 225 mW rating and 25 Ω ZZT limit voltage excursion to <±0.25 V during 100 ms surges, preserving downstream IC integrity. |
Use Scenario: Generating stable 12 V reference for microcontroller ADC in automotive HVAC control module. IC Role / Device Role / Timing Role: Precision voltage reference source with AEC-Q101 qualification for functional safety-critical sensing. Use Value: ±5.8% VZ tolerance and +6.0 mV/°C TC enable <±1.5% total error over −40°C to +125°C operating range. |
| Industrial Sensor Node Biasing | USB-C PD Adapter Feedback Divider |
Use Scenario: Providing regulated bias voltage for analog front-end op-amps in battery-powered wireless sensor nodes. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 µA) Zener reference ensuring multi-year battery life in always-on monitoring systems. Use Value: Sub-microamp reverse leakage minimizes quiescent current draw, extending coin-cell lifetime beyond 5 years at 25°C. |
Use Scenario: Setting precise 12 V feedback threshold in USB-C Power Delivery adapter secondary-side controller. IC Role / Device Role / Timing Role: High-stability Zener element in optocoupler feedback divider network for isolated output regulation. Use Value: 25 Ω dynamic impedance ensures <0.5% output voltage deviation under 10–90% load steps, meeting USB PD v3.0 ripple requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C12LT1 | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and SZ prefix | Not suitable for automotive production; acceptable for consumer-grade prototypes | Select only if AEC-Q101 compliance is not required and cost sensitivity outweighs qualification needs |
| SZBZX84B12LT1G | Tighter 2% VZ tolerance (11.8–12.2 V), same SOT-23 package and thermal specs | Better accuracy for precision references; higher cost and reduced availability vs. C-series | Choose when ±2% regulation accuracy is mandatory and budget permits premium tolerance grade |
Compared with SZBZX84C12LT1, BZX84C12LT1 omits automotive qualification and traceability, while SZBZX84B12LT1G trades wider tolerance for tighter 2% VZ control - making SZBZX84C12LT1 the optimal balance of cost, qualification, and performance for volume automotive and industrial designs.
Availability
SZBZX84C12LT1 is available at Aetrix Electronics and suitable for automotive cabin controllers, smartphone power management ICs, and industrial sensor node biasing requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SZBZX84C12LT1 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 solutions for automotive, industrial, cloud, and IoT applications.
SZBZX84C12LT1 belongs to the BZX84CxxxLT1 family of Zener regulators designed specifically for high-density, low-power voltage reference and protection in automotive and portable electronics.
FAQ
What is the Zener voltage tolerance of SZBZX84C12LT1?
The SZBZX84C12LT1 has a nominal Zener voltage of 12 V with a tolerance of ±5.8%, specified as 11.4 V minimum to 12.7 V maximum at 5 mA test current. This tolerance reflects the standard C-series grading and is confirmed in the Electrical Characteristics table on page 3 of the official datasheet.
Is SZBZX84C12LT1 qualified for automotive use?
Yes, SZBZX84C12LT1 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the datasheet. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, distinguishing it from commercial-grade BZX84C12LT1 variants.
What is the pin configuration of SZBZX84C12LT1?
SZBZX84C12LT1 uses the SOT-23 package with pinout: Pin 1 = Anode, Pin 2 = No Connection (unbonded), Pin 3 = Cathode. This configuration is documented in the Electrical Characteristics tables on pages 3 and 4, and confirmed in the Marking Diagram on page 2.
Does SZBZX84C12LT1 support lead-free assembly?
Yes, SZBZX84C12LT1 is compatible with lead-free reflow processes. Its package meets Pb-free requirements, and the "G" suffix variant (SZBZX84C12LT1G) is explicitly designated as Pb-free in the Ordering Information table. Maximum soldering temperature is rated at 260°C for 10 seconds.
What is the maximum reverse leakage current for SZBZX84C12LT1?
The maximum reverse leakage current for SZBZX84C12LT1 is 0.1 µA at a reverse voltage of 9.4 V, as specified in the Electrical Characteristics table on page 3. This value is measured at TA = 25°C and ensures ultra-low standby power consumption in always-on circuits.
SZBZX84C12LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84C12LT1 FAQ
1.How can I place an order for SZBZX84C12LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C12LT1 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 SZBZX84C12LT1 reliable?
The price and inventory of SZBZX84C12LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C12LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C12LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C12LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C12LT1?
SZBZX84C12LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C12LT1 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 SZBZX84C12LT1?
For technical support, including SZBZX84C12LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C12LT1 requirements.
6.How does Aetrix verify that SZBZX84C12LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C12LT1 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 SZBZX84C12LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C12LT1?
All SZBZX84C12LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C12LT1, 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 SZBZX84C12LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C12LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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