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onsemi SZBZX84C43LT1G
- Part No.:
- SZBZX84C43LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C43LT1G.pdf
- Description:
- DIODE ZENER 43V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,900
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Product details
Overview
SZBZX84C43LT1G from onsemi is a 43 V ±7% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board, with 150 Ω dynamic impedance at 5 mA test current and 80 µA max reverse leakage at 34.4 V. It provides precision voltage regulation in space-constrained power rail protection and reference circuits.
For engineers reviewing the SZBZX84C43LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±7%), thermal coefficient (+30.1 mV/°C), junction-to-ambient thermal resistance (500 °C/W), and AEC-Q101 qualification for automotive use.
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 (2 mA, 5 mA, 20 mA) to support design flexibility across load conditions. The cathode-anode polarity is marked by a band, and terminal 2 is internally unconnected.
Designed for surface-mount assembly on high-density PCBs, it features Class 3 ESD rating (>16 kV HBM), Pb-free construction, and UL 94 V-0 flammability compliance. Junction temperature range spans −65°C to +150°C, enabling operation in extended industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 40–46 V at 5 mA test current; defines stable clamping threshold for overvoltage protection |
| Power Dissipation | 250 mW on FR-5 board; limits continuous energy handling without heatsinking |
| Zener Impedance | 150 Ω at 5 mA; determines regulation stiffness under varying load current |
| Reverse Leakage | 80 µA max at 34.4 V; sets minimum quiescent current in standby mode |
| Temp Coefficient | +30.1 mV/°C at 5 mA; quantifies voltage drift over operating temperature range |
| Capacitance | 40 pF at 0 V bias, 1 MHz; impacts high-frequency noise filtering capability |
| ESD Rating | Class 3 (>16 kV HBM); ensures robustness during automated PCB handling and assembly |
Pinout & Package
Package: SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; forward-biased during conduction |
| 2 | No Connection | Internally unconnected; no electrical function or PCB routing required |
| 3 | Cathode | Connected to higher-potential side; Zener breakdown occurs between pins 1 and 3 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics |
| Standard Tolerance Series | ±7% Zener voltage tolerance enables cost-effective regulation where tight accuracy is not required |
| High ESD Robustness | Class 3 Human Body Model rating (>16 kV) reduces risk of damage during board assembly |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and supports lead-free reflow soldering profiles |
| Optimized for High-Density Layout | SOT-23 footprint minimizes PCB area while maintaining thermal performance on FR-5 substrates |
Applications
| Automotive Power Rail Protection | Industrial Sensor Reference Supply |
|---|---|
|
Use Scenario: Clamping transient spikes on 48 V battery-supplied ECUs to prevent IC damage. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy above 43 V threshold. Use Value: Prevents voltage excursions beyond 46 V (max Zener) while drawing only 80 µA at 34.4 V standby. |
Use Scenario: Providing stable 43 V bias for analog front-end amplifiers in factory automation sensors. IC Role / Device Role / Timing Role: Passive voltage reference establishing fixed headroom for op-amp supply rails. Use Value: Maintains <±0.5% output stability over −40°C to +125°C due to predictable +30.1 mV/°C TC. |
| Portable Device Battery Monitoring | Telecom Line Interface Protection |
|
Use Scenario: Detecting overvoltage condition in multi-cell Li-ion battery packs during charging. IC Role / Device Role / Timing Role: Zener-based comparator input threshold set at 43 V to trigger fault shutdown. Use Value: Enables accurate trip point with 40–46 V window, minimizing false triggers from ripple or noise. |
Use Scenario: Protecting Ethernet PHY transceivers from induced surges on PoE-powered lines. IC Role / Device Role / Timing Role: Primary clamping element diverting fast transients before reaching sensitive I/O pins. Use Value: Limits peak voltage to ≤46 V with 150 Ω dynamic impedance, reducing stress on downstream TVS stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C43LT1G | Same Zener voltage range (40–46 V), but lacks AEC-Q101 qualification and automotive PPAP support | Restricted to commercial-grade systems; not suitable for automotive OEM designs | Select when automotive compliance is unnecessary and cost is prioritized |
| SZBZX84C47LT1G | Higher nominal Zener voltage (44–50 V), +32.9 mV/°C tempco, 40 pF capacitance | Used where 47 V clamping threshold better matches system overvoltage margin requirements | Choose for tighter alignment with 48 V nominal bus systems requiring higher trip points |
Compared with SZBZX84C43LT1G, BZX84C43LT1G offers identical electrical regulation but omits automotive qualification, while SZBZX84C47LT1G shifts the clamping window upward by 4 V-enabling differentiated overvoltage response in multi-rail protection schemes.
Availability
SZBZX84C43LT1G is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference supplies, and telecom line interface protection requiring stable component supply across long production lifecycles.
Supply support for SZBZX84C43LT1G 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
SZBZX84C43LT1G belongs to the SZBZX84CxxxLT1G series of AEC-Q101-qualified Zener diodes designed specifically for automotive and high-reliability industrial voltage regulation tasks.
FAQ
What is the Zener voltage tolerance of SZBZX84C43LT1G?
The SZBZX84C43LT1G has a standard tolerance Zener voltage range of 40 V to 46 V at 5 mA test current, corresponding to ±7% around the nominal 43 V rating. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet, and applies specifically to the SZBZX84C43LT1G variant-not the tighter-tolerance B-series devices.
Is SZBZX84C43LT1G qualified for automotive applications?
Yes, SZBZX84C43LT1G 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 SZBZX84C43LT1G suitable for engine control units, body electronics, and ADAS subsystems.
What is the pin configuration and polarity marking for SZBZX84C43LT1G?
SZBZX84C43LT1G uses the SOT-23 package with pinout: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. Polarity is indicated by a cathode band adjacent to Pin 3, per the Marking Diagram on page 2 and Mechanical Characteristics section of the datasheet.
How does the temperature coefficient affect SZBZX84C43LT1G's regulation accuracy?
The SZBZX84C43LT1G exhibits a positive temperature coefficient of +30.1 mV/°C at 5 mA, meaning its Zener voltage increases linearly with junction temperature. Over a −40°C to +125°C range, this results in ~4.97 V total drift-critical for precision reference designs where thermal compensation must be factored into system-level error budgets.
What packaging and environmental compliance does SZBZX84C43LT1G meet?
SZBZX84C43LT1G is supplied in Pb-free, RoHS-compliant SOT-23 tape-and-reel packaging (3,000 units per reel), with UL 94 V-0 flammability rating and Class 3 ESD robustness (>16 kV HBM). These attributes are documented in the Features and Mechanical Characteristics sections of the onsemi datasheet.
SZBZX84C43LT1G 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):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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)
SZBZX84C43LT1G FAQ
1.How can I place an order for SZBZX84C43LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C43LT1G 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 SZBZX84C43LT1G reliable?
The price and inventory of SZBZX84C43LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C43LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C43LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C43LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C43LT1G?
SZBZX84C43LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C43LT1G 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 SZBZX84C43LT1G?
For technical support, including SZBZX84C43LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C43LT1G requirements.
6.How does Aetrix verify that SZBZX84C43LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C43LT1G 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 SZBZX84C43LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C43LT1G?
All SZBZX84C43LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C43LT1G, 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 SZBZX84C43LT1G part is unused and in its original packaging.
Return procedure for SZBZX84C43LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C43LT1G Tags
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