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onsemi SZBZX84C20LT1
- Part No.:
- SZBZX84C20LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C20LT1.pdf
- Description:
- DIODE ZENER 20V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SZBZX84C20LT1 from onsemi is a 20 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 55 Ω dynamic impedance at 5 mA test current and 14 mV/°C temperature coefficient - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C20LT1 datasheet, pinout, applications, or equivalent options, key selection factors include Zener tolerance (±5%), thermal coefficient (14 mV/°C), leakage current (≤0.05 µA at 15.2 V), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal silicon Zener diode with cathode-anode polarity, designed for reverse-biased voltage regulation. It exhibits 18.8 V minimum and 21.2 V maximum Zener voltage at 5 mA test current, with 225 Ω maximum impedance at 20 mA and 50 Ω typical impedance at 1 mA.
The junction temperature range spans −65°C to +150°C, and it achieves Class 3 ESD robustness (>16 kV HBM). Its capacitance is 85 pF at 0 V bias and 1 MHz, supporting stable operation in low-noise analog reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.8–21.2 V @ IZT = 5 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous power handling in standard PCB layout |
| Zener Impedance (ZZT) | 55 Ω @ 5 mA - determines AC regulation stiffness and ripple rejection capability |
| Reverse Leakage Current | ≤0.05 µA @ VR = 15.2 V - ensures minimal quiescent current in standby voltage-sense paths |
| Temperature Coefficient | +14 mV/°C @ 5 mA - quantifies voltage drift per degree ambient change, critical for temperature-stable references |
| Capacitance | 85 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise coupling and transient response in filtering applications |
| ESD Rating | Class 3 (>16 kV) per HBM - enables direct integration into handheld electronics without external ESD protection |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting mold compound, corrosion-resistant finish, UL 94 V-0 flammability rating, 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; forward conduction path when used as clamp |
| 2 | No Connection | Internally unconnected lead - must remain floating; no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; polarity band on package identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 power rating | Enables compact voltage regulation without heatsinking in space-constrained portable designs |
| ±5% Zener tolerance | Supports mid-precision reference needs without requiring post-calibration trimming |
| Class 3 ESD robustness | Eliminates need for discrete ESD protection in consumer-grade battery-powered interfaces |
| AEC-Q101 qualified | Validates reliability for automotive body electronics and infotainment power monitoring |
| Pb-free SOT-23 package | Meets RoHS compliance requirements without sacrificing thermal or mechanical performance |
Applications
| USB Power Rail Protection | Smartphone Battery Monitor Reference |
|---|---|
Use Scenario: Clamping 5 V USB input against surge events in charging IC front-end circuits. IC Role / Device Role / Timing Role: Zener clamping diode providing overvoltage protection by shunting excess current above 20 V threshold. Use Value: Limits transient voltage to ≤21.2 V with 55 Ω dynamic impedance, preventing damage to downstream LDOs and USB PHYs. |
Use Scenario: Generating stable reference for ADC measurement of Li-ion battery pack voltage. IC Role / Device Role / Timing Role: Precision Zener voltage source feeding resistive divider network into ADC input. Use Value: Delivers 20 V ±5% reference with 14 mV/°C TC, enabling <1% full-scale error across −20°C to +70°C operating range. |
| Industrial Sensor Signal Conditioning | IoT Node Voltage Supervisor |
Use Scenario: Biasing op-amp input stage in 24 V industrial current-loop transmitter. IC Role / Device Role / Timing Role: Zener-regulated bias rail stabilizing amplifier common-mode voltage. Use Value: Maintains 20 V reference within ±0.5 V over 10–100 mA load variation due to low 55 Ω ZZT. |
Use Scenario: Monitoring 3.3 V system rail in battery-powered edge node using comparator with hysteresis. IC Role / Device Role / Timing Role: Zener-based reference setting undervoltage lockout (UVLO) threshold at 3.0 V via resistor divider. Use Value: Achieves <0.1 µA standby current draw at 3.3 V supply thanks to ≤0.05 µA leakage at 15.2 V reverse bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C20LT1 | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and SZ prefix | Not suitable for automotive environments requiring PPAP documentation or extended temperature validation | Select only for cost-sensitive consumer applications where AEC-Q101 is not mandated |
| SZBZX84C20LT1G | Identical Zener parameters and SOT-23 package; "G" suffix denotes Pb-free variant with same mechanical dimensions | No functional difference; fully interchangeable in RoHS-compliant assembly lines | Preferred for new designs targeting lead-free manufacturing and global environmental compliance |
Compared with SZBZX84C20LT1, BZX84C20LT1 omits automotive qualification and traceability controls, while SZBZX84C20LT1G provides identical performance with Pb-free materials - making the latter optimal for future-proof, environmentally compliant production.
Availability
SZBZX84C20LT1 is available at Aetrix Electronics and suitable for USB power protection, smartphone battery monitoring, industrial sensor conditioning, and IoT node voltage supervision requiring stable component supply across automotive, industrial, and consumer programs.
Supply support for SZBZX84C20LT1 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, signal processing, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
SZBZX84C20LT1 belongs to the BZX84CxxxLT1 family of Zener regulators engineered for high-density, low-power voltage reference and protection in portable and automotive electronics.
FAQ
What is the Zener voltage tolerance of SZBZX84C20LT1?
The SZBZX84C20LT1 has a nominal Zener voltage of 20 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 18.8 V and 21.2 V when tested at 5 mA. This tolerance is specified in the Electrical Characteristics table on page 3 of the official datasheet and applies directly to the SZBZX84C20LT1 part number under standard conditions (TA = 25°C).
Does SZBZX84C20LT1 have a connection on pin 2?
No, pin 2 of the SZBZX84C20LT1 is internally unconnected (NC). The device uses only pins 1 (anode) and 3 (cathode) for operation. This is explicitly stated in the Pinout section of the datasheet: "(Pinout: 1-Anode, 2-No Connection, 3-Cathode)". PCB layout must leave pin 2 floating with no trace or pad.
Is SZBZX84C20LT1 qualified for automotive applications?
Yes, SZBZX84C20LT1 is AEC-Q101 qualified and PPAP capable, as confirmed in the Features section of the datasheet. The "SZ" prefix specifically denotes parts meeting automotive and other applications requiring unique site and control change requirements - distinguishing it from standard BZX84C20LT1 variants.
What is the maximum reverse leakage current for SZBZX84C20LT1?
The maximum reverse leakage current for SZBZX84C20LT1 is 0.05 µA at a reverse voltage of 15.2 V, as specified in the Electrical Characteristics table. This value is measured at TA = 25°C and reflects worst-case leakage under sub-threshold bias, critical for low-power battery monitoring applications.
Can SZBZX84C20LT1 be used in place of BZX84C20LT1?
SZBZX84C20LT1 can functionally replace BZX84C20LT1 in most circuits, but it adds AEC-Q101 qualification, PPAP capability, and enhanced traceability controls. The electrical specifications are identical; however, BZX84C20LT1 lacks automotive validation and may not meet OEM requirements for vehicle subsystems.
SZBZX84C20LT1 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):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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)
SZBZX84C20LT1 FAQ
1.How can I place an order for SZBZX84C20LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C20LT1 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 SZBZX84C20LT1 reliable?
The price and inventory of SZBZX84C20LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C20LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C20LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C20LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C20LT1?
SZBZX84C20LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C20LT1 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 SZBZX84C20LT1?
For technical support, including SZBZX84C20LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C20LT1 requirements.
6.How does Aetrix verify that SZBZX84C20LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C20LT1 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 SZBZX84C20LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C20LT1?
All SZBZX84C20LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C20LT1, 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 SZBZX84C20LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C20LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C20LT1 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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