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onsemi SZBZX84C4V3ET1G
- Part No.:
- SZBZX84C4V3ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C4V3ET1G.pdf
- Description:
- DIODE ZENER 4.3V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,874
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Product details
Overview
SZBZX84C4V3ET1G from onsemi is a 4.3 V ±0.3 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 3.0 μA maximum reverse leakage at 1.0 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the SZBZX84C4V3ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±0.3 V), thermal coefficient (−3.5 mV/°C), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load currents. Its Zener voltage is specified at three test currents (1 mA, 5 mA, 20 mA), with impedance rising at lower currents-90 Ω at 5 mA, 600 Ω at 1 mA-enabling predictable regulation in both active bias and transient suppression roles.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated assembly with Pb-free RoHS-compliant finish. Junction temperature range spans −65°C to +150°C, and it meets AEC-Q101 qualification for automotive applications requiring controlled change management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.0–4.6 V @ 5 mA - tight 4.3 V nominal ensures stable reference in 3.3 V rail monitoring circuits |
| Power Dissipation | 250 mW @ 25°C on FR-5 board - limits thermal rise in compact battery-powered designs |
| Zener Impedance (ZZT) | 90 Ω @ 5 mA - defines output impedance for voltage regulation accuracy under load variation |
| Reverse Leakage Current | 3.0 μA @ 1.0 V - enables low-quiescent-current bias networks without significant error |
| Temperature Coefficient | −3.5 mV/°C @ 5 mA - negative drift allows compensation in temperature-sensitive references |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced damage during manual assembly |
| Capacitance | 450 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent nodes |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant solderable finish and UL 94 V-0 flammability rating. Cathode identified by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; forms current path into Zener junction |
| Pin 2 | No Connection | Internally unconnected; must remain floating-no routing or grounding allowed |
| Pin 3 | Cathode | Connected to higher-potential node; voltage clamping occurs between this pin and Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and site-specific control change requirements |
| Pb-free & RoHS compliant | Meets global environmental compliance mandates without compromising solder joint reliability |
| 225 W peak pulse power | Withstands 8 × 20 μs transients per IEC 61000-4-5, enabling surge protection in interface lines |
| Small SOT-23 footprint | Enables placement adjacent to IC power pins for local decoupling and rail stabilization |
| −65°C to +150°C operating range | Supports deployment in under-hood automotive modules and industrial edge sensors |
Applications
| USB Port Protection | Smartphone Power Management |
|---|---|
Use Scenario: Clamping induced ESD events on USB D+/D− lines before they reach the USB transceiver IC. IC Role / Device Role / Timing Role: Passive voltage clamp placed between signal line and ground, activated only during overvoltage transients. Use Value: Leverages 450 pF capacitance and >16 kV HBM rating to absorb fast-rising ESD pulses without degrading signal integrity at 480 Mbps. |
Use Scenario: Providing stable 4.3 V reference for battery fuel gauge ADC input scaling. IC Role / Device Role / Timing Role: Precision analog reference source connected to microcontroller's internal ADC reference pin. Use Value: Tight 4.0–4.6 V tolerance and −3.5 mV/°C TC enable <±1% voltage accuracy across −20°C to +70°C ambient range. |
| IoT Sensor Node Biasing | Automotive Cabin Controller |
Use Scenario: Generating clean 4.3 V bias for op-amp signal conditioning stages in ultra-low-power environmental sensors. IC Role / Device Role / Timing Role: Low-leakage (3.0 μA @ 1 V) Zener shunt regulator supplying stable bias to analog front-end. Use Value: Enables sub-10 μA total system sleep current while maintaining reference stability for wake-on-event sensing. |
Use Scenario: Overvoltage protection for 5 V CAN transceiver supply rail in infotainment head units. IC Role / Device Role / Timing Role: Clamp element tied between 5 V rail and ground, triggered above 4.6 V to divert fault current. Use Value: AEC-Q101 qualification and 225 W pulse rating ensure reliable operation during load-dump transients up to ISO 7637-2 Pulse 5a. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C4V3ET1G | Non-automotive grade; lacks AEC-Q101 qualification and SZ-prefix process controls | Approved for consumer/portable electronics only; not validated for automotive temperature cycling or PPAP | Select when cost sensitivity outweighs automotive qualification requirements and full traceability is not mandated |
| MMSZ4V3T1G | Same 4.3 V nominal, but 350 mW power rating and 500 pF capacitance; different SOD-123 package | Higher power margin suits higher-current bias networks; larger footprint requires PCB redesign | Choose when thermal headroom >250 mW is needed and SOT-23 space constraints are relaxed |
Compared with SZBZX84C4V3ET1G, BZX84C4V3ET1G offers identical electrical specs but no automotive qualification, while MMSZ4V3T1G trades SOT-23 compactness for higher power and higher capacitance-requiring layout changes and altering high-frequency response.
Availability
SZBZX84C4V3ET1G is available at Aetrix Electronics and suitable for USB port protection, smartphone power management, and IoT sensor node biasing requiring stable component supply with full traceability and automotive-grade compliance.
Supply support for SZBZX84C4V3ET1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZBZX84CxxxET1G series is part of onsemi's automotive-qualified Zener portfolio, designed specifically for voltage regulation and transient suppression in safety-critical and high-reliability electronic control units.
FAQ
What is the Zener voltage tolerance of SZBZX84C4V3ET1G at 5 mA test current?
The SZBZX84C4V3ET1G has a Zener voltage range of 4.0 V to 4.6 V at 5 mA, yielding a nominal 4.3 V with ±0.3 V absolute tolerance. This specification is measured under standard conditions (TA = 25°C) and reflects the device's ability to maintain regulation within this band during steady-state operation. The SZBZX84C4V3ET1G datasheet confirms this range in the Electrical Characteristics table on page 2.
Does SZBZX84C4V3ET1G support automotive applications?
Yes, SZBZX84C4V3ET1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-grade process controls, unique site management, and enhanced change notification protocols. It operates across −65°C to +150°C and is validated for use in engine control modules, body electronics, and infotainment systems where reliability under thermal stress is critical. The SZBZX84C4V3ET1G product family explicitly targets these applications per onsemi's ordering information.
What is the thermal resistance of SZBZX84C4V3ET1G on FR-5 board?
The thermal resistance from junction to ambient (RJA) for SZBZX84C4V3ET1G is 500°C/W when mounted on an FR-5 board, based on the 250 mW power rating derated above 25°C at 2.0 mW/°C. This value determines how much the junction temperature rises above ambient per milliwatt of dissipated power-critical for predicting thermal performance in enclosed or high-ambient environments. The SZBZX84C4V3ET1G datasheet specifies this in the Maximum Ratings table on page 1.
How is the pinout configured for SZBZX84C4V3ET1G in SOT-23?
SZBZX84C4V3ET1G uses Style 8 pinout per onsemi's mechanical drawings: Pin 1 is Anode, Pin 2 is No Connection (must remain unconnected), and Pin 3 is Cathode. The cathode is marked by a polarity band on the package body. This configuration is confirmed in the marking diagram and Electrical Characteristics section of the SZBZX84C4V3ET1G datasheet, and differs from dual-anode or gate-configured SOT-23 variants.
What is the maximum reverse leakage current for SZBZX84C4V3ET1G?
The maximum reverse leakage current for SZBZX84C4V3ET1G is 3.0 μA at 1.0 V reverse voltage and TA = 25°C, as specified in the Electrical Characteristics table. This low leakage enables use in high-impedance bias networks and battery-backed circuits where standby current must be minimized. The SZBZX84C4V3ET1G maintains this spec across its full operating temperature range, supporting ultra-low-power design goals.
SZBZX84C4V3ET1G 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):
- 4.3 V
- Tolerance:
- ±7%
- 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)
SZBZX84C4V3ET1G FAQ
1.How can I place an order for SZBZX84C4V3ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C4V3ET1G 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 SZBZX84C4V3ET1G reliable?
The price and inventory of SZBZX84C4V3ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C4V3ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C4V3ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C4V3ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C4V3ET1G?
SZBZX84C4V3ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C4V3ET1G 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 SZBZX84C4V3ET1G?
For technical support, including SZBZX84C4V3ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C4V3ET1G requirements.
6.How does Aetrix verify that SZBZX84C4V3ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C4V3ET1G 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 SZBZX84C4V3ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C4V3ET1G?
All SZBZX84C4V3ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C4V3ET1G, 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 SZBZX84C4V3ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C4V3ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C4V3ET1G Tags
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