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onsemi SZBZX84C39ET1G
- Part No.:
- SZBZX84C39ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C39ET1G.pdf
- Description:
- DIODE ZENER 39V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:26,416
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Product details
Overview
SZBZX84C39ET1G from onsemi is a 39 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and reference applications with ±2 V tolerance at 5 mA test current, 130 Ω dynamic impedance, and −55 °C to +150 °C operating range-used in power supply feedback loops, overvoltage protection, and voltage clamping circuits.
For engineers reviewing the SZBZX84C39ET1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and automotive-grade qualification per AEC-Q101-critical for high-reliability portable and industrial designs.
Technical Context
This Zener diode operates in reverse breakdown mode with nominal VZ = 39 V at IZT = 5 mA, exhibiting a temperature coefficient of +27.3 mV/°C and capacitance of 45 pF at 0 V bias and 1 MHz. Its two-terminal structure (anode/cathode) and no-connection pin 2 enable simple integration into compact voltage reference networks.
Designed for FR-5 board mounting, it delivers 250 mW total power dissipation at 25 °C with 500 °C/W junction-to-ambient thermal resistance, derating linearly above 25 °C at 2.0 mW/°C-supporting stable operation in thermally constrained PCB layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37 V to 41 V at 5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 250 mW on FR-5 board at 25 °C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 130 Ω at 5 mA - determines AC regulation stability and ripple rejection capability |
| Reverse Leakage (IR) | 50 nA at 30.4 V - ensures minimal standby current in high-impedance bias networks |
| Capacitance (C) | 45 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in fast-switching nodes |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct handling and assembly without special ESD controls |
| AEC-Q101 Qualified | Yes - validates suitability for automotive electronics requiring extended temperature and reliability compliance |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, Pb-free, void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by polarity band; rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during conduction |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; defines Zener breakdown voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 qualified and PPAP capable-enables use in engine control, ADAS, and infotainment systems |
| High-density packaging | SOT-23 footprint supports >10,000 units/in² placement density on modern PCBs |
| Robust ESD immunity | Class 3 HBM (>16 kV) eliminates need for external ESD protection in most consumer and industrial interfaces |
| Thermal performance | 500 °C/W RJA on FR-5 allows operation up to +85 °C ambient without derating in low-power circuits |
| Pb-free & RoHS compliant | Fully compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 moisture sensitivity |
Applications
| Power Supply Feedback | Voltage Clamp Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters. IC Role / Device Role / Timing Role: Provides precise 39 V reference for optocoupler-based feedback loop error amplification. Use Value: Maintains ±2% output accuracy across line/load/temperature variations due to tight VZ tolerance and low ZZT. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Acts as bidirectional shunt clamp between signal line and ground, limiting peak voltage to 39 V. Use Value: Absorbs 225 W peak pulses (8 × 20 µs) without failure, preserving downstream logic integrity. |
| Reference Voltage Source | Overvoltage Detection Threshold |
|
Use Scenario: Generating stable analog reference for ADCs or comparators in battery-powered sensors. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-compensated 39 V reference to precision analog front-ends. Use Value: Delivers <45 pF capacitance and +27.3 mV/°C TC-enabling predictable drift compensation in calibration routines. |
Use Scenario: Triggering shutdown circuitry when input bus exceeds safe operating limits. IC Role / Device Role / Timing Role: Serves as threshold element in comparator-based overvoltage detection ladder. Use Value: Ensures reliable trip point at 39 V ±2 V with <50 nA leakage-minimizing false triggers in high-impedance sensing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C39ET1G | Non-automotive grade; lacks AEC-Q101 qualification and PPAP support; identical electrical specs and SOT-23 package | Suitable for commercial/industrial designs where automotive reliability validation is not required | Select when cost sensitivity outweighs automotive compliance needs and lifecycle assurance is secondary |
| MMSZ4702T1G | Same 39 V nominal Zener voltage but rated at 500 mW; larger SOD-123 package; 100 Ω ZZT at 5 mA | Better thermal margin for higher-power clamping; requires larger PCB area and different layout | Choose when sustained power dissipation exceeds 250 mW or board space permits larger footprint |
Compared with SZBZX84C39ET1G, BZX84C39ET1G offers identical regulation performance at lower qualification cost, while MMSZ4702T1G trades package size for doubled power capacity-making each suitable for distinct thermal, reliability, and space-constrained design priorities.
Availability
SZBZX84C39ET1G is available at Aetrix Electronics and suitable for automotive ECUs, industrial power supplies, and portable medical devices requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SZBZX84C39ET1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.
SZBZX84C39ET1G belongs to the BZX84CxxxET1G/SZBZX84CxxxET1G series-designed specifically for space-constrained, high-reliability voltage regulation in automotive and portable electronics where small size, AEC-Q101 compliance, and robust ESD immunity are mandatory.
FAQ
What is the Zener voltage tolerance of SZBZX84C39ET1G at 5 mA test current?
The SZBZX84C39ET1G has a Zener voltage range of 37 V to 41 V at IZT = 5 mA, corresponding to a ±2 V absolute tolerance or approximately ±5.1% of the nominal 39 V rating. This tolerance is guaranteed across the full operating temperature range of −55 °C to +150 °C and is validated per onsemi's production testing protocol.
Is SZBZX84C39ET1G suitable for automotive applications?
Yes, SZBZX84C39ET1G is AEC-Q101 qualified and PPAP capable, meeting stringent automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock validation. Its SZ prefix explicitly denotes automotive-grade manufacturing controls and site-specific change management-making it appropriate for engine control modules, body electronics, and ADAS subsystems.
What is the maximum peak pulse power rating for SZBZX84C39ET1G?
The SZBZX84C39ET1G is rated for 225 W peak pulse power under nonrepetitive 8 × 20 µs waveform conditions, as defined in Figure 9 of the datasheet. This rating applies at TL ≤ 25 °C and supports transient suppression in surge-prone interfaces such as USB ports, sensor inputs, and CAN bus lines without device failure.
How does the thermal derating curve affect SZBZX84C39ET1G's usable power at 85 °C ambient?
At 85 °C ambient, SZBZX84C39ET1G's usable power drops to 130 mW: starting from 250 mW at 25 °C, it derates at 2.0 mW/°C above 25 °C (60 °C delta × 2.0 mW/°C = 120 mW reduction). This ensures safe junction temperature operation below 150 °C without heatsinking in typical FR-5 board configurations.
Does SZBZX84C39ET1G have a connected pin 2, and what is its function?
No, pin 2 of SZBZX84C39ET1G is internally unconnected (NC) and must remain floating on the PCB-no trace, pad, or solder connection should be made. This is confirmed in the marking diagram (Style 8) and Electrical Characteristics table, where pinout is explicitly defined as "1-Anode, 2-No Connection, 3-Cathode".
SZBZX84C39ET1G 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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)
SZBZX84C39ET1G FAQ
1.How can I place an order for SZBZX84C39ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C39ET1G 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 SZBZX84C39ET1G reliable?
The price and inventory of SZBZX84C39ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C39ET1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C39ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C39ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C39ET1G?
SZBZX84C39ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C39ET1G 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 SZBZX84C39ET1G?
For technical support, including SZBZX84C39ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C39ET1G requirements.
6.How does Aetrix verify that SZBZX84C39ET1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C39ET1G 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 SZBZX84C39ET1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C39ET1G?
All SZBZX84C39ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C39ET1G, 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 SZBZX84C39ET1G part is unused and in its original packaging.
Return procedure for SZBZX84C39ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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