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onsemi SZBZX84C3V9LT1G
- Part No.:
- SZBZX84C3V9LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C3V9LT1G.pdf
- Description:
- DIODE ZENER 3.9V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,863
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Product details
Overview
SZBZX84C3V9LT1G from onsemi is a 3.9 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 90 Ω dynamic impedance at 5 mA test current and −2.5 mV/°C temperature coefficient - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C3V9LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal coefficient (−2.5 mV/°C), low leakage (3 µA @ 3 V), 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 reference diode, conducting in reverse breakdown to clamp voltage at 3.9 V nominal with tight regulation across 1–20 mA operating range. Its −2.5 mV/°C temperature coefficient ensures stable reference performance over −65°C to +150°C junction temperature.
The SOT-23 package features cathode-indicated polarity band, Pb-free construction, UL 94 V-0 flammability rating, and 260°C soldering tolerance for reflow compatibility. Pin 2 is internally unconnected - confirmed by mechanical outline Style 8 and electrical characterization tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.7–4.1 V @ 5 mA - defines regulated output voltage window under standard bias |
| Power Dissipation | 250 mW on FR-5 board - sets maximum continuous power handling without derating |
| Zener Impedance | 90 Ω @ 5 mA - determines voltage regulation stiffness against load current variation |
| Reverse Leakage | 3 µA @ 3 V - limits quiescent current in standby or sensing circuits |
| Temp Coefficient | −2.5 mV/°C @ 5 mA - quantifies voltage drift per degree Celsius change in ambient |
| Capacitance | 450 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and AC coupling behavior |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld and exposed I/O interfaces |
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 and cathode polarity band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node during regulation |
| 2 | No Connection | Internally isolated; no electrical function - must remain unconnected on PCB |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node for Zener operation |
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 |
| Tight Thermal Stability | −2.5 mV/°C coefficient enables <±15 mV drift over 0–60°C ambient range |
| High ESD Robustness | Class 3 HBM (>16 kV) eliminates need for external transient suppression in portable designs |
| Optimized for Automated Assembly | SOT-23 footprint supports high-speed pick-and-place and reflow soldering with zero tombstoning risk |
Applications
| USB Power Rail Protection | Low-Voltage Microcontroller Reference |
|---|---|
Use Scenario: Clamping 5 V USB supply to safe level before feeding 3.3 V LDO input in battery-powered peripherals. IC Role / Device Role / Timing Role: Zener voltage clamp limiting transient overvoltage on input rail. Use Value: Prevents LDO damage during hot-plug surges while consuming only 3 µA leakage at idle. |
Use Scenario: Providing stable 3.9 V reference for ADC voltage divider in wearable health sensors. IC Role / Device Role / Timing Role: Precision analog reference source with minimal thermal drift. Use Value: Enables <±0.5% full-scale accuracy over 0–50°C operating range due to −2.5 mV/°C TC. |
| Cellular Baseband Power Sequencing | Industrial Sensor Signal Conditioning |
Use Scenario: Biasing enable threshold of PMIC sequencing controller in LTE modem modules. IC Role / Device Role / Timing Role: Voltage-level translator defining logic-high activation point. Use Value: Delivers repeatable 3.9 V trigger with 90 Ω dynamic impedance ensuring fast response to rail ramp-up. |
Use Scenario: Protecting op-amp inputs from ESD events in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Input-stage transient suppressor shunting >16 kV HBM strikes. Use Value: Eliminates need for discrete TVS diodes, reducing BOM count and PCB area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C3V9LT1G | Same Zener voltage (3.7–4.1 V), identical SOT-23 package, but lacks AEC-Q101 qualification and automotive PPAP support | Restricted to commercial-grade systems; not suitable for automotive OEM or Tier-1 programs | Select when cost sensitivity outweighs automotive compliance requirements |
| SZBZX84C3V3LT1G | Lower nominal Zener voltage (3.3 V), same tolerance (±5%), identical thermal coefficient (−3.5 mV/°C), and package | Used where 3.3 V rail stabilization is required instead of 3.9 V - e.g., FPGA configuration banks | Choose only if system voltage target matches 3.3 V specification; not a drop-in replacement |
Compared with SZBZX84C3V9LT1G, BZX84C3V9LT1G offers identical electrical performance but no automotive qualification, while SZBZX84C3V3LT1G shifts the regulation point downward by 0.6 V - requiring circuit recalibration and altering clamping thresholds in protection schemes.
Availability
SZBZX84C3V9LT1G is available at Aetrix Electronics and suitable for USB power protection, microcontroller reference design, cellular baseband sequencing, and industrial sensor conditioning requiring stable component supply across automotive, medical, and IoT production programs.
Supply support for SZBZX84C3V9LT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
SZBZX84C3V9LT1G belongs to the SZBZX84CxxxLT1G automotive-qualified Zener regulator series, designed specifically for voltage reference and overvoltage protection in safety-critical and high-reliability electronic control units.
FAQ
What is the Zener voltage tolerance of SZBZX84C3V9LT1G?
The SZBZX84C3V9LT1G has a nominal Zener voltage of 3.9 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 3.7 V and 4.1 V when tested at 5 mA (IZT). This tolerance is specified per the onsemi datasheet revision 23 and applies across the full operating temperature range of −65°C to +150°C.
Is SZBZX84C3V9LT1G qualified for automotive applications?
Yes, SZBZX84C3V9LT1G is AEC-Q101 qualified and PPAP capable, meeting the stress-test and reliability requirements for automotive electronics. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls, site-specific process validation, and extended temperature operation up to +150°C junction temperature.
What is the function of Pin 2 on SZBZX84C3V9LT1G?
Pin 2 of SZBZX84C3V9LT1G is a no-connect (NC) terminal - it is internally unconnected and serves no electrical function. Per onsemi's mechanical outline Style 8 and electrical characterization data, this pin must remain unconnected on the PCB to avoid unintended parasitic paths or assembly defects.
How does the temperature coefficient affect SZBZX84C3V9LT1G performance?
SZBZX84C3V9LT1G exhibits a temperature coefficient of −2.5 mV/°C at 5 mA, meaning its Zener voltage decreases by 2.5 mV for every 1°C rise in junction temperature. This allows predictable voltage drift modeling - for example, a 40°C ambient shift causes ~100 mV total deviation, critical for precision reference designs.
Can SZBZX84C3V9LT1G replace BZX84C3V9LT1G in existing designs?
SZBZX84C3V9LT1G is pin-, package-, and electrically compatible with BZX84C3V9LT1G, sharing identical Zener voltage, impedance, leakage, and SOT-23 footprint. However, SZBZX84C3V9LT1G adds AEC-Q101 qualification and automotive PPAP support - making it a direct upgrade path for designs targeting automotive certification without layout changes.
SZBZX84C3V9LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZBZX84CxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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)
SZBZX84C3V9LT1G FAQ
1.How can I place an order for SZBZX84C3V9LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C3V9LT1G 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 SZBZX84C3V9LT1G reliable?
The price and inventory of SZBZX84C3V9LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C3V9LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C3V9LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C3V9LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C3V9LT1G?
SZBZX84C3V9LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C3V9LT1G 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 SZBZX84C3V9LT1G?
For technical support, including SZBZX84C3V9LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C3V9LT1G requirements.
6.How does Aetrix verify that SZBZX84C3V9LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C3V9LT1G 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 SZBZX84C3V9LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C3V9LT1G?
All SZBZX84C3V9LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C3V9LT1G, 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 SZBZX84C3V9LT1G part is unused and in its original packaging.
Return procedure for SZBZX84C3V9LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C3V9LT1G Tags
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