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onsemi SZBZX84C56LT1
- Part No.:
- SZBZX84C56LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C56LT1.pdf
- Description:
- DIODE ZENER 56V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
SZBZX84C56LT1 from onsemi is a 56 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 200 Ω dynamic impedance at 5 mA test current and 110 µA maximum reverse leakage at 44.8 V, used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C56LT1 datasheet, pinout, applications, or equivalent options, key selection factors include Zener voltage tolerance (±5%), thermal coefficient (+39.2 mV/°C), junction-to-ambient thermal resistance (556 °C/W), and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, designed for stable regulation under reverse-biased conditions. It exhibits a nominal Zener voltage of 56 V at 5 mA test current, with temperature coefficient of +39.2 mV/°C and capacitance of 40 pF at 0 V bias and 1 MHz.
The SOT-23 package supports automated surface-mount assembly and provides ESD robustness exceeding 16 kV per Human Body Model. Its junction temperature range spans −65°C to +150°C, enabling use in extended industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 56 V nominal, min 52 V / max 60 V at 5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous power handling without forced cooling |
| Zener Impedance | 200 Ω at 5 mA - indicates voltage regulation stability under varying load currents |
| Reverse Leakage | 110 µA max at 44.8 V - determines minimum shunt current required to maintain regulation |
| Temperature Coefficient | +39.2 mV/°C - quantifies voltage drift per degree Celsius change in junction temperature |
| Capacitance | 40 pF at 0 V, 1 MHz - affects high-frequency noise filtering and transient response in bypass applications |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness during PCB handling and assembly |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting epoxy, corrosion-resistant finish, UL 94 V-0 flammability rating, 260°C soldering tolerance for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; current enters here during Zener conduction |
| 2 | No Connection | Internally unconnected terminal; must remain floating in PCB layout |
| 3 | Cathode | Connected to higher-potential node; polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics |
| Pb-Free Packaging | RoHS-compliant SOT-23 construction with lead-free terminations suitable for modern reflow processes |
| Tight Thermal Stability | +39.2 mV/°C tempco enables predictable voltage drift compensation in temperature-critical designs |
| High-Density Mounting | Small footprint (2.9 mm × 1.3 mm) supports compact PCB layouts in space-constrained portables |
| ESD Robustness | Class 3 HBM rating (>16 kV) reduces risk of field failure due to electrostatic discharge events |
Applications
| USB Power Protection | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamping 5 V USB supply rail against transient overvoltage spikes from hot-plug events or ESD. IC Role / Device Role / Timing Role: Shunt voltage regulator providing low-impedance path to ground above 56 V threshold. Use Value: Prevents damage to downstream USB controllers by limiting rail voltage excursion to safe levels using its 56 V Zener breakdown. | Use Scenario: Providing stable reference voltage for analog signal conditioning circuits in engine coolant temperature sensors. IC Role / Device Role / Timing Role: Precision voltage reference source with known tempco for ratiometric ADC scaling. Use Value: Enables accurate temperature measurement across −40°C to +125°C ambient via compensated 56 V reference point. |
| Industrial PLC Input Protection | Portable Medical Device Biasing |
Use Scenario: Protecting 24 V DC input channels of programmable logic controllers from surge-induced overvoltage. IC Role / Device Role / Timing Role: Overvoltage clamp placed across input terminals to divert excess energy during transients. Use Value: Maintains system uptime by preventing false triggering or latch-up in digital inputs during 24 V line disturbances. | Use Scenario: Generating stable bias voltage for op-amp front-end stages in handheld ECG monitors. IC Role / Device Role / Timing Role: Low-noise voltage reference supporting high-resolution analog signal acquisition. Use Value: Delivers clean 56 V reference with <40 pF capacitance to minimize signal coupling and preserve ECG waveform fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C56LT1 | Same electrical specs but lacks AEC-Q101 qualification and SZ prefix; Pb-free option requires G suffix | Not qualified for automotive use; suitable only for commercial-grade systems | Select when cost sensitivity outweighs automotive reliability requirements |
| SZBZX84C56LT1G | Identical electrical and thermal performance; differs only in Pb-free marking and packaging compliance | No functional difference; used where RoHS/ELV compliance is mandatory | Choose for new designs requiring full environmental compliance documentation |
Compared with SZBZX84C56LT1, BZX84C56LT1 offers identical regulation performance but omits automotive qualification, while SZBZX84C56LT1G adds Pb-free assurance without altering electrical behavior-making the original part optimal for AEC-Q101–mandated applications where legacy compatibility is prioritized.
Availability
SZBZX84C56LT1 is available at Aetrix Electronics and suitable for USB power protection, automotive sensor reference, industrial PLC input protection, and portable medical device biasing requiring stable component supply across production lifecycles.
Supply support for SZBZX84C56LT1 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZBZX84C56LT1 belongs to the BZX84CxxxLT1 family of Zener regulators, engineered specifically for compact, high-reliability voltage reference and clamping in automotive and industrial environments.
FAQ
What is the Zener voltage tolerance of SZBZX84C56LT1?
The SZBZX84C56LT1 has a Zener voltage tolerance of ±5%, meaning its nominal 56 V breakdown occurs between 52 V and 60 V at 5 mA test current. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, where min/nom/max values are explicitly listed as 52 V / 56 V / 60 V. The SZBZX84C56LT1 maintains this specification across its qualified operating temperature range.
Is SZBZX84C56LT1 qualified for automotive applications?
Yes, SZBZX84C56LT1 is AEC-Q101 qualified and PPAP capable, as stated in the Features section of the datasheet. The "SZ" prefix explicitly denotes automotive and other applications requiring unique site and control change requirements. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD-ensuring reliability in engine control, body electronics, and ADAS subsystems where the SZBZX84C56LT1 is deployed.
What is the thermal resistance of SZBZX84C56LT1 on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZBZX84C56LT1 is 556 °C/W when mounted on FR-5 board, as specified in the Maximum Ratings table. This value applies at TA = 25°C and assumes standard pad layout per JEDEC standards. Derating is 1.8 mW/°C above 25°C, limiting usable power dissipation in high-temperature environments-a critical parameter for thermal design when using SZBZX84C56LT1 in enclosed enclosures or near heat sources.
Does SZBZX84C56LT1 have a no-connect pin, and how should it be handled?
Yes, SZBZX84C56LT1 has Pin 2 designated as "No Connection" per the marking diagram and Electrical Characteristics table. This terminal is internally unconnected and must remain electrically floating in PCB layout-no trace, pad, or plane should connect to it. Incorrect routing to ground or power would compromise device function and may cause unexpected leakage paths. The SZBZX84C56LT1 pinout (1-Anode, 2-NC, 3-Cathode) is fixed and non-configurable.
What is the maximum reverse leakage current for SZBZX84C56LT1?
The maximum reverse leakage current for SZBZX84C56LT1 is 110 µA at 44.8 V (80% of nominal Zener voltage), as specified in the Electrical Characteristics table. This parameter defines the upper limit of current drawn before breakdown onset and directly impacts quiescent power loss in always-on bias networks. At 25°C ambient, the SZBZX84C56LT1 remains well within this spec, ensuring predictable turn-on behavior in precision reference applications.
SZBZX84C56LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±7%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 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)
SZBZX84C56LT1 FAQ
1.How can I place an order for SZBZX84C56LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C56LT1 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 SZBZX84C56LT1 reliable?
The price and inventory of SZBZX84C56LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C56LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C56LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C56LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C56LT1?
SZBZX84C56LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C56LT1 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 SZBZX84C56LT1?
For technical support, including SZBZX84C56LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C56LT1 requirements.
6.How does Aetrix verify that SZBZX84C56LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C56LT1 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 SZBZX84C56LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C56LT1?
All SZBZX84C56LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C56LT1, 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 SZBZX84C56LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C56LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C56LT1 Tags
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MMBZ5240B-7-F
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onsemi
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