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onsemi SZBZX84C39LT3G
- Part No.:
- SZBZX84C39LT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C39LT3G.pdf
- Description:
- DIODE ZENER 39V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:22,241
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Product details
Overview
SZBZX84C39LT3G from onsemi is a 39 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 130 Ω dynamic impedance at 5 mA test current and −55°C to +150°C operating temperature range. It provides precision voltage regulation in space-constrained portable electronics and high-density PCBs.
For engineers reviewing the SZBZX84C39LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (500 °C/W), ESD rating (>16 kV HBM), reverse leakage current (50 nA @ 31.1 V), and automotive-grade AEC-Q101 qualification.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at 39 V with tight regulation across temperature. Its SOT-23 package features cathode-indicated polarity band and Pb-free construction compliant with RoHS.
The SZBZX84C39LT3G exhibits a temperature coefficient of +27.3 mV/°C at 5 mA, enabling predictable drift compensation in stable reference designs. It delivers 70 Ω impedance at 20 mA and maintains ≤50 nA leakage at VR = 31.1 V, supporting low-power standby regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 39 V nominal, min 37 V / max 41 V at 5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation | 250 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance | 130 Ω at 5 mA - determines AC voltage variation under load transients; lower values improve regulation stability |
| Reverse Leakage | 50 nA max at 31.1 V - ensures minimal quiescent current draw in battery-powered hold-up circuits |
| Temperature Coefficient | +27.3 mV/°C at 5 mA - quantifies voltage drift per degree Celsius; enables thermal error budgeting in precision references |
| ESD Rating | Class 3 (>16 kV) per HBM - guarantees robustness against human-body electrostatic discharge during assembly and handling |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient environments |
Pinout & Package
Package: SOT-23 (TO-236), 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by polarity band; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and ADAS power rails |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements without lead-based solder compatibility compromises |
| ESD Robustness | Withstands >16 kV human-body model discharge-reduces need for external protection in handheld designs |
| High-Density Packaging | SOT-23 footprint enables placement on 0.65 mm pitch traces-ideal for compact mobile PCB layouts |
| Tight Thermal Derating | 2.0 mW/°C reduction above 25°C-supports accurate thermal margining in thermally constrained enclosures |
Applications
| Portable Power Management | Automotive Sensor Reference |
|---|---|
Use Scenario: Voltage clamping in USB-powered IoT sensors with Li-ion battery input ranging from 3.0–4.2 V. IC Role / Device Role / Timing Role: Zener diode acting as overvoltage protector and precision reference for ADC biasing. Use Value: Maintains 39 V regulation tolerance (±5%) across −40°C to +85°C, ensuring consistent sensor calibration without active feedback. |
Use Scenario: Stable reference generation for pressure and temperature transducers in engine control units. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing isolated 39 V rail for analog front-end excitation. Use Value: AEC-Q101 qualification and −55°C to +150°C junction range enable direct integration into under-hood modules without derating. |
| Industrial PLC I/O Protection | Medical Wearable Biasing |
Use Scenario: Input protection for 24 V DC digital inputs exposed to inductive switching transients. IC Role / Device Role / Timing Role: Fast-response shunt clamp limiting surge voltage to 39 V peak during 100 ns spikes. Use Value: 130 Ω dynamic impedance at 5 mA ensures sub-100 ns response to EFT bursts, preserving downstream logic integrity. |
Use Scenario: Low-noise bias supply for photodiode amplifiers in pulse oximetry modules. IC Role / Device Role / Timing Role: Passive voltage reference stabilizing op-amp common-mode voltage in ultra-low-power analog chains. Use Value: 50 nA max reverse leakage at 31.1 V minimizes current injection errors, enabling <1 µV offset drift in medical-grade signal 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 |
|---|---|---|---|
| BZX84C39LT1G | Same electrical specs but 3,000-piece tape-and-reel packaging vs. 10,000-piece for SZBZX84C39LT3G; no AEC-Q101 qualification | Targeted at commercial-grade consumer electronics rather than automotive or industrial deployments | Select when volume requirements are <3k units and automotive qualification is unnecessary |
| SZBZX84C39LT1G | Identical Zener parameters and AEC-Q101 qualification, but shipped in 3,000-piece tape-and-reel format | Preferred for prototyping, low-volume production, or where reel size impacts pick-and-place feeder compatibility | Choose for NPI phases or small-batch builds requiring full automotive compliance without bulk packaging |
Compared with BZX84C39LT1G and SZBZX84C39LT1G, the SZBZX84C39LT3G offers identical regulation performance and AEC-Q101 validation while optimizing cost-per-unit and logistics efficiency for high-volume automotive and industrial manufacturing via its 10,000-piece reel configuration.
Availability
SZBZX84C39LT3G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and portable medical devices requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for SZBZX84C39LT3G 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, medical, and IoT applications.
The BZX84Cxxx series-including SZBZX84C39LT3G-is designed specifically for surface-mount voltage regulation in space-constrained, high-reliability systems where low-profile packaging and AEC-Q101 compliance are mandatory.
FAQ
What is the Zener voltage tolerance of SZBZX84C39LT3G?
The SZBZX84C39LT3G has a nominal Zener voltage of 39 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 37 V and 41 V when measured at 5 mA test current and 25°C ambient temperature. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 23, August 2021).
Is SZBZX84C39LT3G qualified for automotive use?
Yes, SZBZX84C39LT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, making it suitable for under-hood and safety-critical vehicle subsystems.
What is the thermal resistance of SZBZX84C39LT3G on FR-5 board?
The thermal resistance, junction-to-ambient (RJA), for SZBZX84C39LT3G is 500 °C/W when mounted on an FR-5 board. This value is specified in the Maximum Ratings table and directly determines how much the junction temperature rises per milliwatt of dissipated power at 25°C ambient.
Does SZBZX84C39LT3G have a no-connect pin, and how should it be handled on PCB?
Yes, SZBZX84C39LT3G has Pin 2 designated as "No Connection" per the mechanical outline (Style 8) and Electrical Characteristics tables. This terminal is internally unconnected and must remain electrically floating-no PCB trace, pad, or solder mask opening is required for Pin 2 in layout design.
What is the maximum reverse leakage current for SZBZX84C39LT3G, and at what voltage is it specified?
The maximum reverse leakage current for SZBZX84C39LT3G is 50 nA, specified at a reverse voltage (VR) of 31.1 V and ambient temperature of 25°C. This parameter appears in the Electrical Characteristics table on page 3 and reflects the device's ability to minimize standby current in low-power regulation circuits.
SZBZX84C39LT3G 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 250 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)
SZBZX84C39LT3G FAQ
1.How can I place an order for SZBZX84C39LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C39LT3G 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 SZBZX84C39LT3G reliable?
The price and inventory of SZBZX84C39LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C39LT3G is usually 5 days.
3.What payment methods are accepted for SZBZX84C39LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C39LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C39LT3G?
SZBZX84C39LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C39LT3G 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 SZBZX84C39LT3G?
For technical support, including SZBZX84C39LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C39LT3G requirements.
6.How does Aetrix verify that SZBZX84C39LT3G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C39LT3G 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 SZBZX84C39LT3G meets industry standards.
7.What is the process for return or replacement of SZBZX84C39LT3G?
All SZBZX84C39LT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C39LT3G, 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 SZBZX84C39LT3G part is unused and in its original packaging.
Return procedure for SZBZX84C39LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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