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onsemi SZBZX84C3V9ET3G
- Part No.:
- SZBZX84C3V9ET3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C3V9ET3G.pdf
- Description:
- DIODE ZENER 3.9V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
SZBZX84C3V9ET3G from onsemi is a 3.9 V ±0.2 V Zener diode in SOT-23 package, rated for 250 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. It provides precision voltage regulation in space-constrained portable electronics such as battery-powered sensors and low-voltage microcontroller reset circuits.
For engineers reviewing the SZBZX84C3V9ET3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5.1%), reverse leakage current (≤3.0 µA at 1.0 V), thermal coefficient stability, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its Zener voltage is specified at three test currents (1 mA, 5 mA, and 20 mA), enabling stable regulation across varying load conditions. The SOT-23 package supports automated placement and reflow soldering with 260°C peak temperature tolerance.
Thermal resistance is 500 °C/W on FR-5 board and 417 °C/W on alumina substrate, defining maximum allowable ambient temperature rise under continuous DC bias. ESD robustness exceeds 16 kV per Human Body Model, supporting handling in standard manufacturing environments without special precautions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.9 V nominal, 3.7–4.1 V min/max at 5 mA - ensures tight regulation window for 3.3 V system rails |
| Power Dissipation | 250 mW at TA = 25°C on FR-5 board - defines maximum continuous DC power before thermal derating |
| Zener Impedance | 90 Ω max at IZT = 5 mA - determines output voltage variation under load transients |
| Reverse Leakage | ≤3.0 µA at VR = 1.0 V - critical for low-power standby modes in battery applications |
| Temp. Coefficient | −2.5 mV/°C at IZT = 5 mA - enables predictable drift compensation in temperature-varying environments |
| Capacitance | 450 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability |
| ESD Rating | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in handheld designs |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward conduction; connected to lower-potential node in Zener configuration |
| 2 | No Connection | Internally unconnected terminal - must remain floating; no PCB trace or pad required |
| 3 | Cathode | DC current exit point during reverse breakdown; tied to regulated voltage rail or reference node |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics |
| Pb-Free & RoHS Compliant | Meets EU Directive 2011/65/EU and JESD204B process requirements for green manufacturing |
| Peak Pulse Power | 225 W for 8 × 20 µs waveform - withstands ESD and transient surges without degradation |
| Small Outline Package | SOT-23 footprint saves >65% board area vs. DO-35 axial leaded equivalents |
| High Density Assembly | Optimized leadframe geometry supports 0.65 mm pitch pick-and-place and reflow compatibility |
Applications
| Smartphone Power Management | Automotive Cabin Sensors |
|---|---|
Use Scenario: Regulating reference voltage for Li-ion battery fuel gauge ICs in compact smartphone PCBs. IC Role / Device Role / Timing Role: Zener diode providing stable 3.9 V reference to ADC input of fuel gauge controller. Use Value: Tight 3.7–4.1 V tolerance ensures <±0.5% battery SOC error across operating temperature range. | Use Scenario: Biasing analog front-end of cabin temperature sensor in automotive HVAC control module. IC Role / Device Role / Timing Role: Voltage clamp protecting op-amp input stage from supply transients during ignition events. Use Value: AEC-Q101 qualification guarantees operation over −40°C to +125°C junction temperature. |
| Industrial IoT Node | Medical Wearable Monitor |
Use Scenario: Providing regulated bias for ultra-low-power MCU reset circuit in battery-operated wireless sensor node. IC Role / Device Role / Timing Role: Zener diode holding reset pin at defined threshold until VCC stabilizes post-power-up. Use Value: ≤3.0 µA leakage at 1.0 V minimizes quiescent current drain, extending 10-year battery life. | Use Scenario: Stabilizing reference voltage for ECG signal conditioning amplifier in wearable heart monitor. IC Role / Device Role / Timing Role: Precision voltage reference ensuring consistent gain calibration across patient usage conditions. Use Value: −2.5 mV/°C tempco enables <±1.2% reference drift from 25°C to 45°C skin-contact environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C3V9ET1G | Same electrical specs but 3,000-piece tape-and-reel packaging; non-automotive grade marking | Lacks SZ prefix and AEC-Q101 validation; not approved for automotive production | Select when cost sensitivity outweighs automotive qualification requirements |
| MMSZ4685T1G | 3.9 V Zener, 500 mW rating, SOD-123 package; higher power but larger footprint | Higher thermal mass supports 100 mA surge current; less suitable for ultra-dense layouts | Choose for industrial power supplies needing higher pulse energy handling |
Compared with BZX84C3V9ET1G, SZBZX84C3V9ET3G adds automotive qualification and 10,000-piece reel packaging; versus MMSZ4685T1G, it trades power headroom for 42% smaller PCB area and tighter thermal response.
Availability
SZBZX84C3V9ET3G is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical devices, and industrial IoT nodes requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZBZX84C3V9ET3G 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 power and sensing solutions for automotive, industrial, cloud, and consumer electronics.
The BZX84CxxxETxG series is designed for compact, high-reliability voltage regulation in portable and automotive systems where space, thermal performance, and qualification compliance are critical.
FAQ
What is the Zener voltage tolerance of SZBZX84C3V9ET3G at 5 mA test current?
The SZBZX84C3V9ET3G has a Zener voltage specification of 3.7 V minimum to 4.1 V maximum at IZT = 5 mA, representing a ±5.1% tolerance around the nominal 3.9 V rating. This tolerance is verified per onsemi's Electrical Characteristics table on page 2 of the August 2024 datasheet revision, and applies under TA = 25°C conditions with pulse testing to avoid self-heating effects. The SZBZX84C3V9ET3G maintains this specification across its qualified operating temperature range.
Is SZBZX84C3V9ET3G suitable for automotive applications?
Yes, SZBZX84C3V9ET3G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix explicitly indicating automotive and other applications requiring unique site and control change requirements. Its construction, test protocols, and traceability meet automotive quality standards, and it is rated for junction temperatures from −65°C to +150°C. The SZBZX84C3V9ET3G is documented in onsemi's official datasheet as compliant for use in engine control units, body electronics, and ADAS subsystems.
What is the maximum reverse leakage current for SZBZX84C3V9ET3G at 1.0 V bias?
The maximum reverse leakage current for SZBZX84C3V9ET3G is 3.0 µA at VR = 1.0 V and TA = 25°C, as specified in the Electrical Characteristics table on page 2 of the onsemi datasheet. This value is measured under standardized test conditions and reflects worst-case leakage for design margining in ultra-low-power applications. The SZBZX84C3V9ET3G exhibits this performance consistently across its qualified production lots.
Does SZBZX84C3V9ET3G have a no-connect pin, and how should it be handled on PCB?
Yes, SZBZX84C3V9ET3G has Pin 2 designated as "No Connection" per the mechanical outline and pinout definition in the onsemi datasheet (Style 8, page 5). This terminal is internally unconnected and must remain electrically floating on the PCB - no trace, pad, or ground connection should be made. The SZBZX84C3V9ET3G pinout requires only Pins 1 (Anode) and 3 (Cathode) to be routed, with Pin 2 left isolated to prevent unintended parasitic coupling.
What is the thermal resistance junction-to-ambient for SZBZX84C3V9ET3G on FR-5 board?
The thermal resistance junction-to-ambient (RJA) for SZBZX84C3V9ET3G is 500 °C/W when mounted on FR-5 board, as stated in the Maximum Ratings table on page 1 of the onsemi datasheet. This value assumes standard JEDEC-defined board dimensions (1.0 × 0.75 × 0.62 inches) and defines the temperature rise per watt of dissipated power. At 250 mW maximum dissipation, this yields a 125°C junction-to-ambient delta, confirming the SZBZX84C3V9ET3G's suitability for ambient temperatures up to +25°C in sealed enclosures.
SZBZX84C3V9ET3G 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):
- 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)
SZBZX84C3V9ET3G FAQ
1.How can I place an order for SZBZX84C3V9ET3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C3V9ET3G 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 SZBZX84C3V9ET3G reliable?
The price and inventory of SZBZX84C3V9ET3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C3V9ET3G is usually 5 days.
3.What payment methods are accepted for SZBZX84C3V9ET3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C3V9ET3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C3V9ET3G?
SZBZX84C3V9ET3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C3V9ET3G 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 SZBZX84C3V9ET3G?
For technical support, including SZBZX84C3V9ET3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C3V9ET3G requirements.
6.How does Aetrix verify that SZBZX84C3V9ET3G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C3V9ET3G 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 SZBZX84C3V9ET3G meets industry standards.
7.What is the process for return or replacement of SZBZX84C3V9ET3G?
All SZBZX84C3V9ET3G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C3V9ET3G, 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 SZBZX84C3V9ET3G part is unused and in its original packaging.
Return procedure for SZBZX84C3V9ET3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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