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onsemi SZBZX84C51LT1
- Part No.:
- SZBZX84C51LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C51LT1.pdf
- Description:
- DIODE ZENER 51V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:21,000
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Product details
Overview
SZBZX84C51LT1 from onsemi is a 51 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 180 Ω dynamic impedance at 5 mA test current and 100 nA reverse leakage at 38.25 V, used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C51LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient (+35.7 mV/°C), junction-to-ambient thermal resistance (556 °C/W), and Pb-free SOT-23 packaging compliance with AEC-Q101.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across its cathode-anode terminals under reverse bias when current exceeds the knee threshold. Its Zener breakdown mechanism delivers predictable regulation with temperature coefficient of +35.7 mV/°C at 5 mA and capacitance of 40 pF at 0 V bias and 1 MHz.
The SOT-23 package supports automated surface-mount assembly with cathode indicated by band marking, and features ESD rating >16 kV per Human Body Model. It is qualified to AEC-Q101 for automotive applications and specified for junction temperatures from −65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 48–54 V at 5 mA test current; defines regulated clamp voltage range for overvoltage protection circuits |
| Power Dissipation | 225 mW on FR-5 board at 25°C; sets maximum continuous power handling before thermal derating begins |
| Zener Impedance | 180 Ω at 5 mA; determines regulation stiffness-lower values improve load regulation accuracy |
| Reverse Leakage | 100 nA at 38.25 V (75% of VZ); indicates low standby current draw in high-impedance bias networks |
| Temperature Coefficient | +35.7 mV/°C at 5 mA; quantifies voltage drift per degree Celsius-critical for temperature-stable references |
| 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 against electrostatic discharge during handling and PCB assembly |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting construction with corrosion-resistant finish, 260°C soldering tolerance for 10 seconds, UL 94 V-0 flammability rating.
| 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 terminal; must remain floating-no PCB trace or pad connection permitted |
| 3 | Cathode | Connected to higher-potential node; marked by polarity band; sinks regulation current during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage clamping in space-constrained portable designs without external heatsinking |
| AEC-Q101 Qualification | Validates reliability for automotive body electronics, infotainment power supplies, and ADAS sensor interfaces |
| Pb-Free Packaging | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 requirements |
| Tight Thermal Coefficient Control | +35.7 mV/°C enables predictable drift compensation in temperature-critical reference circuits |
| High ESD Robustness | Class 3 HBM (>16 kV) eliminates need for external ESD protection in handheld and wearable end equipment |
Applications
| USB Power Rail Protection | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamp 5 V USB supply against transient surges up to ±15 kV ESD events in portable accessories. IC Role / Device Role / Timing Role: Shunt regulator providing low-leakage, fast-response overvoltage protection at power input stage. Use Value: Prevents damage to downstream USB controllers using only 100 nA leakage at 38.25 V and 180 Ω dynamic impedance. |
Use Scenario: Stabilize 5 V reference for analog front-end of tire pressure monitoring systems (TPMS). IC Role / Device Role / Timing Role: Precision voltage reference source with +35.7 mV/°C TC compensated via system software calibration. Use Value: Maintains <±1.5% output stability over −40°C to +125°C ambient with AEC-Q101 qualification. |
| Industrial PLC I/O Module | Medical Wearable Battery Monitor |
Use Scenario: Regulate 24 V DC field bus voltage in programmable logic controller digital input modules. IC Role / Device Role / Timing Role: Zener clamp protecting optocoupler input stages from line transients and inductive kickback. Use Value: Withstands 225 mW continuous dissipation and 556 °C/W thermal resistance on standard FR-5 PCB layout. |
Use Scenario: Provide stable 3.3 V reference for lithium-ion battery fuel gauge ICs in hearables and glucose monitors. IC Role / Device Role / Timing Role: Low-capacitance (40 pF) voltage reference minimizing signal distortion in ADC sampling paths. Use Value: Enables <0.1% measurement accuracy over battery life cycle due to tight 48–54 V Zener spread and low leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C51LT1 | Same electrical specs but non-automotive grade; no AEC-Q101 qualification; Pb-free option not guaranteed | Limited to commercial-grade consumer electronics; unsuitable for automotive or industrial safety-critical use | Select only if cost sensitivity outweighs reliability and qualification requirements |
| SZBZX84C51LT1G | Identical electrical and thermal specs; differs only in Pb-free marking suffix and tape/reel packaging (3000 pcs vs. unspecified for SZBZX84C51LT1) | Functionally interchangeable in all applications; preferred for RoHS-compliant production runs | Choose SZBZX84C51LT1G when Pb-free compliance and traceable sourcing are mandatory |
Compared with BZX84C51LT1, SZBZX84C51LT1 offers AEC-Q101 validation and controlled site sourcing, while SZBZX84C51LT1G adds guaranteed Pb-free status and standardized tape-and-reel delivery-making SZBZX84C51LT1 the optimal choice for automotive and industrial deployments requiring full lifecycle assurance.
Availability
SZBZX84C51LT1 is available at Aetrix Electronics and suitable for USB power rail protection, automotive sensor reference, industrial PLC I/O modules, and medical wearable battery monitor designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SZBZX84C51LT1 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZBZX84C51LT1 belongs to the BZX84CxxxLT1 family of Zener regulators designed specifically for high-density, low-power voltage reference and overvoltage protection in portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of SZBZX84C51LT1?
The SZBZX84C51LT1 has a nominal Zener voltage of 51 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 48 V and 54 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet revision 14. The SZBZX84C51LT1 achieves this specification under standard test conditions of TA = 25°C and pulsed current to minimize self-heating effects.
Does SZBZX84C51LT1 have AEC-Q101 qualification?
Yes, SZBZX84C51LT1 is explicitly AEC-Q101 qualified and PPAP capable, as stated in the Features section of the onsemi datasheet. This qualification validates its reliability for automotive applications including engine control units, body electronics, and ADAS sensors. The "SZ" prefix denotes automotive-grade manufacturing controls and site-specific change management required for automotive supply chains.
What is the thermal resistance of SZBZX84C51LT1 on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZBZX84C51LT1 is 556 °C/W when mounted on an FR-5 board at 25°C, per the Maximum Ratings table. This value governs how much the junction temperature rises above ambient per milliwatt of power dissipated. Derating begins at 1.8 mW/°C above 25°C, limiting usable power at elevated ambient temperatures.
How is the pinout configured for SZBZX84C51LT1?
SZBZX84C51LT1 uses a standard SOT-23 pinout: Pin 1 is Anode, Pin 2 is No Connection (internally unconnected), and Pin 3 is Cathode-marked by a visible polarity band on the package. This configuration is verified in the Electrical Characteristics section and Marking Diagram of the datasheet. Pin 2 must remain unconnected on the PCB to avoid functional failure or parametric deviation.
Is SZBZX84C51LT1 Pb-free and RoHS compliant?
SZBZX84C51LT1 is offered in Pb-free packaging, as indicated by the "G" suffix variants (e.g., SZBZX84C51LT1G) and explicitly noted in the Ordering Information and Features sections. While the base part number SZBZX84C51LT1 does not carry the "G" suffix, onsemi's product documentation confirms that all SZ-prefix devices meet JEDEC J-STD-020 moisture sensitivity level 1 and RoHS Directive 2011/65/EU requirements.
SZBZX84C51LT1 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):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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)
SZBZX84C51LT1 FAQ
1.How can I place an order for SZBZX84C51LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C51LT1 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 SZBZX84C51LT1 reliable?
The price and inventory of SZBZX84C51LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C51LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C51LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C51LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C51LT1?
SZBZX84C51LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C51LT1 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 SZBZX84C51LT1?
For technical support, including SZBZX84C51LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C51LT1 requirements.
6.How does Aetrix verify that SZBZX84C51LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C51LT1 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 SZBZX84C51LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C51LT1?
All SZBZX84C51LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C51LT1, 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 SZBZX84C51LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C51LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C51LT1 Tags
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MMBZ5240B-7-F
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