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onsemi SZBZX84C51LT3
- Part No.:
- SZBZX84C51LT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C51LT3.pdf
- Description:
- DIODE ZENER 51V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
SZBZX84C51LT3 from onsemi is a 51 V, ±5% tolerance Zener 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 regulation in portable power rails and reference circuits.
For engineers reviewing the SZBZX84C51LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (51 V), tolerance (±5%), Zener impedance (180 Ω @ 5 mA), 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 using avalanche breakdown in silicon PN junction, with temperature coefficient of +35.7 mV/°C at 5 mA, enabling stable regulation across −65°C to +150°C junction range. Its SOT-23 package features cathode-indicated polarity band and UL 94 V-0 flammability rating.
Designed for surface-mount automated assembly, it delivers 225 mW dissipation on FR-5 board (derated 1.8 mW/°C above 25°C) and 300 mW on alumina substrate. ESD robustness exceeds 16 kV per Human Body Model, supporting handling in high-volume manufacturing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 51 V nominal, min 48 V / max 54 V @ 5 mA - defines regulated output voltage under standard test condition |
| Tolerance | ±5% - ensures voltage accuracy within 2.55 V deviation for closed-loop feedback or biasing applications |
| Zener Impedance | 180 Ω @ 5 mA - determines AC voltage variation under load transients; lower values improve regulation stability |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Reverse Leakage | 100 nA @ 38.25 V - confirms low standby current in high-impedance sensing or battery-backed circuits |
| Temperature Coefficient | +35.7 mV/°C @ 5 mA - quantifies voltage drift with ambient change; positive slope aids compensation in multi-device stacks |
| Capacitance | 40 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering capability and signal integrity in RF-adjacent designs |
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, cathode indicated by band.
| 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 should attach to this pin |
| 3 | Cathode | Zener breakdown terminal; connects to higher-potential node and carries regulated output current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive electronics use with PPAP capability-supports deployment in engine control, body modules, and ADAS sensors |
| ESD Robustness | Class 3 (>16 kV HBM)-enables safe handling during manual assembly and reduces field failure risk in exposed interfaces |
| Pb-Free Packaging | RoHS-compliant SOT-23 with "G" suffix option-meets global environmental compliance without performance trade-off |
| High-Density Mounting | Small outline (2.9 mm × 1.3 mm × 1.0 mm) enables placement on dense PCBs where space is constrained |
| Thermal Performance | 556 °C/W junction-to-ambient on FR-5-supports reliable operation up to 125°C ambient when derated properly |
Applications
| Automotive Body Control Module | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Providing stable 51 V reference for analog front-end amplifiers in door module microcontrollers. IC Role / Device Role / Timing Role: Voltage reference diode regulating supply rail for ADC reference buffer and op-amp bias networks. Use Value: Maintains <±0.5% reference accuracy over −40°C to +105°C ambient, meeting ASIL-B functional safety requirements. | Use Scenario: Generating precise bias voltage for photodiode transimpedance amplifier in handheld pulse oximeters. IC Role / Device Role / Timing Role: Zener-regulated bias source ensuring consistent photocurrent conversion gain across battery discharge cycles. Use Value: 100 nA leakage at 38.25 V prevents signal offset drift in high-gain analog paths, preserving SpO₂ measurement fidelity. |
| Industrial PLC I/O Protection | 5G Small Cell Power Sequencing |
Use Scenario: Clamping transient overvoltage on 48 V backplane inputs of programmable logic controller digital input cards. IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy to ground during EFT or lightning-induced spikes. Use Value: 225 mW power rating sustains 100 ms surges up to 1.2 kV without degradation, extending system MTBF. | Use Scenario: Establishing controlled startup voltage threshold for auxiliary LDO enable in millimeter-wave radio power management ICs. IC Role / Device Role / Timing Role: Precision voltage threshold detector triggering sequencing logic when main supply reaches 51 V ±2.55 V. Use Value: ±5% tolerance and +35.7 mV/°C TC allow deterministic timing margin allocation across −30°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C51LT3 | Standard tolerance (±5%), 225 mW, SOT-23, non-automotive grade | General-purpose industrial and consumer use; no AEC-Q101 validation | Select when cost sensitivity outweighs automotive qualification needs and full 51 V regulation range suffices |
| SZBZX84C51LT3G | Identical electrical specs, Pb-free packaging, AEC-Q101 qualified | Automotive and high-reliability industrial deployments requiring PPAP documentation | Choose for Tier-1 automotive BOMs or medical devices needing RoHS + AEC-Q101 conformance |
Compared with BZX84C51LT3 and SZBZX84C51LT3G, the SZBZX84C51LT3 offers identical Zener characteristics but adds AEC-Q101 qualification and Pb-free compliance-critical for automotive supply chain traceability and long-term lifecycle assurance without altering circuit design or layout.
Availability
SZBZX84C51LT3 is available at Aetrix Electronics and suitable for automotive body control modules, portable medical sensor biasing, industrial PLC I/O protection, and 5G small cell power sequencing requiring stable component supply with full traceability and lifecycle support.
Supply support for SZBZX84C51LT3 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.
The SZBZX84CxxxLT3 series belongs to onsemi's Zener voltage regulator product line, engineered for compact, high-reliability voltage reference and overvoltage protection in space-constrained, mission-critical systems.
FAQ
What is the Zener voltage tolerance of SZBZX84C51LT3?
The SZBZX84C51LT3 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 specified per the BZX84CxxxLT1 series standard and confirmed in the Electrical Characteristics table on page 3 of the official datasheet. The SZBZX84C51LT3 maintains this tolerance across its full operating temperature range of −65°C to +150°C.
Is SZBZX84C51LT3 AEC-Q101 qualified?
Yes, the SZBZX84C51LT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and ESD-making SZBZX84C51LT3 suitable for automotive body electronics and infotainment systems.
What is the maximum power dissipation of SZBZX84C51LT3 on FR-5 board?
The maximum power dissipation of SZBZX84C51LT3 on FR-5 board is 225 mW at 25°C ambient temperature, with a derating factor of 1.8 mW/°C above that temperature. This value is defined in the Maximum Ratings table and reflects real-world thermal performance on standard PCB material. At 85°C ambient, the usable power drops to approximately 119.7 mW (225 mW − (85 − 25) × 1.8 mW).
Does SZBZX84C51LT3 have a no-connect pin, and how should it be handled on PCB?
Yes, SZBZX84C51LT3 has Pin 2 designated as "No Connection" per the marking diagram and Electrical Characteristics table. This pin is internally unconnected and must remain electrically floating-no trace, via, or copper pour should contact it on the PCB layout. Including it in a net or grounding it may cause assembly defects or unintended parasitic coupling, especially in high-frequency or high-precision analog circuits.
What is the Zener impedance of SZBZX84C51LT3 and why does it matter?
The Zener impedance of SZBZX84C51LT3 is 180 Ω measured at 5 mA test current (IZT), as specified in the Electrical Characteristics table. This parameter directly affects regulation accuracy under varying load conditions: lower impedance yields smaller output voltage deviations during current transients. For example, a 1 mA load step causes ~180 mV shift-critical for precision references in ADC biasing or op-amp feedback networks where stability margins are tight.
SZBZX84C51LT3 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)
SZBZX84C51LT3 FAQ
1.How can I place an order for SZBZX84C51LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C51LT3 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 SZBZX84C51LT3 reliable?
The price and inventory of SZBZX84C51LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C51LT3 is usually 5 days.
3.What payment methods are accepted for SZBZX84C51LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C51LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C51LT3?
SZBZX84C51LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C51LT3 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 SZBZX84C51LT3?
For technical support, including SZBZX84C51LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C51LT3 requirements.
6.How does Aetrix verify that SZBZX84C51LT3 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C51LT3 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 SZBZX84C51LT3 meets industry standards.
7.What is the process for return or replacement of SZBZX84C51LT3?
All SZBZX84C51LT3 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C51LT3, 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 SZBZX84C51LT3 part is unused and in its original packaging.
Return procedure for SZBZX84C51LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C51LT3 Tags
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