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onsemi SZBZX84C51LT1G
- Part No.:
- SZBZX84C51LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C51LT1G.pdf
- Description:
- DIODE ZENER 51V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,499
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Product details
Overview
SZBZX84C51LT1G from onsemi is a 51 V ±6% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board, 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 SZBZX84C51LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±6%), temperature coefficient (+35.7 mV/°C), low capacitance (40 pF), AEC-Q101 qualification, and Pb-free SOT-23 packaging for space-constrained automotive and industrial designs.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable reverse-biased breakdown at nominal 51 V. Its thermal resistance of 500 °C/W enables operation up to +150 °C junction temperature under defined derating conditions.
The SZBZX84C51LT1G exhibits a positive temperature coefficient of +35.7 mV/°C at 5 mA, indicating increasing Zener voltage with rising temperature - a critical factor in temperature-sensitive reference designs. It delivers 48.1–54.6 V regulation across 1–20 mA operating current range, with 100 nA leakage at 38.25 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 48.0–54.0 V @ 5 mA - defines regulated output range for voltage clamp or reference applications |
| Power Dissipation | 250 mW on FR-5 board - sets maximum continuous power handling without heatsinking |
| Zener Impedance | 180 Ω @ 5 mA - determines regulation stability under varying load current |
| Reverse Leakage | 100 nA @ 38.25 V - ensures minimal parasitic current in high-impedance bias networks |
| Capacitance | 40 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| Temp. Coefficient | +35.7 mV/°C @ 5 mA - quantifies voltage drift per degree Celsius for thermal compensation design |
| ESD Rating | Class 3 (>16 kV HBM) - supports robust handling in automated assembly and field-replaceable modules |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, void-free thermosetting case, corrosion-resistant finish, UL 94 V-0 flammability rating, 2.90 × 1.30 × 1.00 mm footprint, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current during transient overvoltage events |
| 2 | No Connection | Internally unconnected terminal; must remain floating - no PCB trace or pad connection required |
| 3 | Cathode | Connected to higher-potential node; defines regulated output voltage referenced to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD47 |
| Pb-Free & RoHS Compliant | Meets EU Directive 2011/65/EU and JEDEC JS709E; compatible with lead-free reflow profiles up to 260°C for 10 s |
| Tight Thermal Stability | Junction-to-ambient thermal resistance of 500 °C/W enables operation at +150°C with appropriate board layout |
| Low Capacitance | 40 pF capacitance minimizes loading effects in high-frequency feedback paths and timing circuits |
| High ESD Robustness | Class 3 Human Body Model rating (>16 kV) reduces risk of damage during handling and board-level integration |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stable 51 V reference for microcontroller ADC calibration and CAN transceiver biasing in BCM power domains. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing fixed voltage threshold for overvoltage protection and analog front-end scaling. Use Value: Maintains ±6% regulation accuracy across −40°C to +125°C ambient, enabling reliable fault detection without external trimming. |
Use Scenario: Precision voltage clamp for 4–20 mA loop-powered pressure sensor outputs exposed to EMI-rich factory environments. IC Role / Device Role / Timing Role: Passive shunt regulator absorbing transient surges while preserving signal integrity in analog current loops. Use Value: 100 nA leakage at 38.25 V ensures <0.1% error contribution to 24 V loop compliance voltage, meeting IEC 61000-4-5 Level 3 surge immunity. |
| Portable Medical Diagnostic Device | Telecom Power Management Unit |
Use Scenario: Low-noise voltage reference for battery-operated ECG amplifier stages requiring stable DC offset under variable load. IC Role / Device Role / Timing Role: Zener-based reference source establishing common-mode voltage for instrumentation amplifiers. Use Value: 40 pF capacitance avoids phase shift in high-gain AC-coupled paths, preserving >100 dB CMRR at 60 Hz. |
Use Scenario: Overvoltage protection for 48 V intermediate bus in PoE-powered access point power supplies. IC Role / Device Role / Timing Role: Clamp diode limiting input rail excursions during hot-swap or lightning-induced transients. Use Value: 250 mW rating allows sustained clamping of 100 ms surges up to 60 V without thermal runaway, per IEEE 802.3bt Type 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C51LT1G | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and PPAP capability | Suitable for commercial-grade consumer electronics where automotive reliability is not mandated | Select when cost sensitivity outweighs automotive qualification requirements |
| SZBZX84C51LT3G | Identical electrical and thermal specs; differs only in tape-and-reel packaging (10,000 pcs vs. 3,000 pcs) | Preferred for high-volume production runs requiring reduced changeover frequency on pick-and-place lines | Choose for large-batch manufacturing with optimized logistics and line efficiency |
Compared with BZX84C51LT1G, the SZBZX84C51LT1G adds AEC-Q101 validation and site-specific control for automotive use, while SZBZX84C51LT3G offers identical performance in higher-density packaging - enabling trade-offs between qualification assurance, volume scalability, and supply chain flexibility.
Availability
SZBZX84C51LT1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, portable medical diagnostics, and telecom power management requiring stable component supply with full traceability and lifecycle support.
Supply support for SZBZX84C51LT1G 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 specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SZBZX84C51LT1G belongs to the SZBZX84CxxxLT1G automotive Zener series, engineered for high-reliability voltage regulation in safety-critical systems where AEC-Q101 compliance and controlled manufacturing processes are mandatory.
FAQ
What is the Zener voltage tolerance of SZBZX84C51LT1G?
The SZBZX84C51LT1G has a nominal Zener voltage of 51 V with a tolerance of ±6%, meaning its actual breakdown voltage falls between 48.0 V and 54.0 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The SZBZX84C51LT1G maintains this specification across its qualified operating temperature range and is validated per AEC-Q101 stress tests.
Is SZBZX84C51LT1G suitable for automotive applications?
Yes, SZBZX84C51LT1G is explicitly qualified to AEC-Q101 standards and supports PPAP documentation, making it suitable for automotive applications such as body control modules and infotainment power supplies. The "SZ" prefix denotes automotive-specific process controls and site qualifications. Its thermal rating (−65°C to +150°C junction), ESD robustness (>16 kV HBM), and Pb-free RoHS compliance meet automotive Tier-1 supplier requirements.
What is the pin configuration of SZBZX84C51LT1G?
The SZBZX84C51LT1G uses the SOT-23 package with Style 8 pinout: Pin 1 is Anode, Pin 2 is No Connection (internally unconnected), and Pin 3 is Cathode. This configuration is documented in the marking diagram and mechanical outline on page 2 of the datasheet. The cathode is marked by a polarity band on the package body, and Pin 2 must remain unconnected on the PCB.
How does temperature affect the Zener voltage of SZBZX84C51LT1G?
The SZBZX84C51LT1G has a positive temperature coefficient of +35.7 mV/°C at 5 mA test current, meaning its Zener voltage increases linearly with rising junction temperature. This value is specified in the Electrical Characteristics table and aligns with typical behavior for Zeners above ~5.6 V. Designers must account for this drift in precision reference circuits, especially in wide-temperature-range automotive or industrial deployments.
What is the maximum power dissipation for SZBZX84C51LT1G on standard PCB material?
The SZBZX84C51LT1G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient, with derating of 2.0 mW/°C above that temperature. This rating assumes standard JEDEC-defined board construction (1.0 × 0.75 × 0.62 in.). On alumina substrates, the rating increases to 300 mW. Exceeding these limits risks thermal instability or permanent degradation of the SZBZX84C51LT1G's regulation performance.
SZBZX84C51LT1G 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):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 250 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)
SZBZX84C51LT1G FAQ
1.How can I place an order for SZBZX84C51LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C51LT1G 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 SZBZX84C51LT1G reliable?
The price and inventory of SZBZX84C51LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C51LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C51LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C51LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C51LT1G?
SZBZX84C51LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C51LT1G 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 SZBZX84C51LT1G?
For technical support, including SZBZX84C51LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C51LT1G requirements.
6.How does Aetrix verify that SZBZX84C51LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C51LT1G 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 SZBZX84C51LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C51LT1G?
All SZBZX84C51LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C51LT1G, 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 SZBZX84C51LT1G part is unused and in its original packaging.
Return procedure for SZBZX84C51LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C51LT1G Tags
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