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onsemi SZBZX84C3V9LT1
- Part No.:
- SZBZX84C3V9LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C3V9LT1.pdf
- Description:
- DIODE ZENER 3.9V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
SZBZX84C3V9LT1 from onsemi is a 3.9 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, 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 SZBZX84C3V9LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal coefficient (−2.5 mV/°C), leakage current (≤3 µA @ 3 V), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for reverse-bias regulation only; no internal connection exists at pin 2. It exhibits stable Zener breakdown at 3.9 V nominal with tight 3.7–4.1 V min/max range under 5 mA test current.
Its −2.5 mV/°C temperature coefficient ensures predictable drift across −65°C to +150°C junction range, and its 450 pF capacitance at 0 V bias supports low-frequency stabilization without introducing signal path distortion in DC-coupled feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.7–4.1 V min/max @ 5 mA - defines regulated output voltage tolerance band for reference design. |
| Power Dissipation | 225 mW @ 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating applies. |
| Zener Impedance (ZZT) | 90 Ω @ 5 mA - determines regulation stiffness; lower values improve load transient response in shunt regulator topologies. |
| Reverse Leakage Current | ≤3 µA @ 3 V - limits quiescent current draw in standby mode, critical for battery-powered systems. |
| Temperature Coefficient | −2.5 mV/°C @ 5 mA - quantifies voltage drift per degree; negative sign indicates decreasing VZ with rising temperature. |
| Junction Temp Range | −65°C to +150°C - enables operation in automotive under-hood and industrial ambient environments. |
| ESD Rating | Class 3 (>16 kV) HBM - ensures robustness against human-body electrostatic discharge during assembly and handling. |
Pinout & Package
SOT-23 (Case 318-08) surface-mount plastic package with void-free thermosetting molding, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries full Zener current during regulation. |
| 2 | No Connection | Internally unconnected lead; must remain floating - not tied to ground or any net. |
| 3 | Cathode | Connected to higher-potential node; defines regulated voltage reference point relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 Power Rating | Enables compact shunt regulation without heatsinking in space-constrained portable designs. |
| ±5% Zener Voltage Tolerance | Supports cost-sensitive applications where tighter tolerances (e.g., B-series ±2%) are unnecessary. |
| −2.5 mV/°C Tempco | Provides predictable, monotonic VZ drift for temperature-compensated reference circuits. |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in handheld and consumer interface circuits. |
| AEC-Q101 Qualified | Validates reliability for automotive body electronics, infotainment power supplies, and sensor biasing. |
Applications
| USB-C Port Protection | Smartphone Battery Monitor Reference |
|---|---|
Use Scenario: Clamping transient surges on USB-C VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Shunt Zener clamp placed between VBUS and ground, conducting only above 3.9 V threshold. Use Value: Limits peak voltage to safe level for downstream USB-PD controller ICs without adding series resistance or propagation delay. |
Use Scenario: Providing stable 3.9 V reference for ADC input in battery fuel-gauge circuitry. IC Role / Device Role / Timing Role: Passive voltage reference source feeding into op-amp buffer or resistive divider network. Use Value: Enables <1% full-scale error in battery voltage measurement across −20°C to +70°C operating range. |
| IoT Sensor Node LDO Feedback | Automotive LED Tail Light Bias |
Use Scenario: Setting precise output voltage of low-dropout regulator in wireless sensor module. IC Role / Device Role / Timing Role: Zener diode in adjustable LDO feedback loop, replacing resistor divider for improved stability. Use Value: Reduces output voltage drift by 40% vs. standard resistor-based feedback under thermal cycling. |
Use Scenario: Biasing constant-current LED driver IC in rear lighting cluster. IC Role / Device Role / Timing Role: Reference element establishing current-sense threshold in linear LED controller. Use Value: Maintains ±3% LED brightness consistency across 12 V supply variations and ambient temperature shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C3V9LT1 | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and SZ prefix traceability. | Approved for commercial-grade portable electronics only; not suitable for automotive production. | Select when cost sensitivity outweighs automotive compliance requirements. |
| SZBZX84C3V9LT1G | Pb-free variant with identical Zener parameters, thermal behavior, and SOT-23 footprint. | Required for RoHS-compliant manufacturing; same performance in all functional contexts. | Choose for new designs targeting lead-free assembly and environmental compliance. |
Compared with SZBZX84C3V9LT1, BZX84C3V9LT1 offers identical regulation performance but no automotive qualification, while SZBZX84C3V9LT1G delivers full RoHS compliance without trade-offs in voltage accuracy, thermal stability, or package compatibility.
Availability
SZBZX84C3V9LT1 is available at Aetrix Electronics and suitable for USB-C protection, smartphone battery monitoring, IoT LDO feedback, automotive LED biasing, and industrial sensor reference applications requiring stable component supply and AEC-Q101 validation.
Supply support for SZBZX84C3V9LT1 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
SZBZX84C3V9LT1 belongs to the BZX84CxxxLT1 family of standard-tolerance Zener diodes, engineered for cost-effective, space-efficient voltage regulation in high-volume portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of SZBZX84C3V9LT1?
The SZBZX84C3V9LT1 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. This tolerance is specified per the BZX84CxxxLT1 series standard and confirmed in the Electrical Characteristics table on page 3 of the official datasheet.
Does SZBZX84C3V9LT1 support automotive applications?
Yes, SZBZX84C3V9LT1 is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-grade traceability and process control. It meets stress testing requirements for temperature cycling, humidity, and mechanical shock, making it suitable for body electronics, infotainment power supplies, and sensor biasing in production vehicles.
What is the function of pin 2 on SZBZX84C3V9LT1?
Pin 2 of SZBZX84C3V9LT1 is internally unconnected (NC) - it serves no electrical function and must remain floating in the PCB layout. The active terminals are pin 1 (anode) and pin 3 (cathode), as explicitly defined in the Pinout section of the datasheet and confirmed in the Marking Diagram on page 2.
How does the temperature coefficient affect SZBZX84C3V9LT1 performance?
SZBZX84C3V9LT1 has 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 predictable drift allows designers to compensate reference circuits or select complementary components to maintain system-level accuracy across −65°C to +150°C operating range.
Is SZBZX84C3V9LT1 RoHS compliant?
SZBZX84C3V9LT1 is not inherently Pb-free; however, the Pb-free variant SZBZX84C3V9LT1G is fully RoHS compliant and shares identical electrical and thermal specifications. The "G" suffix denotes lead-free packaging, verified in the Ordering Information table on page 2 of the datasheet.
SZBZX84C3V9LT1 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 225 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)
SZBZX84C3V9LT1 FAQ
1.How can I place an order for SZBZX84C3V9LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C3V9LT1 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 SZBZX84C3V9LT1 reliable?
The price and inventory of SZBZX84C3V9LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C3V9LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C3V9LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C3V9LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C3V9LT1?
SZBZX84C3V9LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C3V9LT1 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 SZBZX84C3V9LT1?
For technical support, including SZBZX84C3V9LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C3V9LT1 requirements.
6.How does Aetrix verify that SZBZX84C3V9LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C3V9LT1 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 SZBZX84C3V9LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C3V9LT1?
All SZBZX84C3V9LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C3V9LT1, 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 SZBZX84C3V9LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C3V9LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C3V9LT1 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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