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onsemi SZ1SMA5933BT3G
- Part No.:
- SZ1SMA5933BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5933BT3G.pdf
- Description:
- DIODE ZENER 22V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:12,417
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Product details
Overview
SZ1SMA5933BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 22 V, ±5% tolerance, 17 Ω dynamic impedance at 17.5 mA test current, and 0.25 μA leakage current at 16.7 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and protection circuits.
For engineers reviewing the SZ1SMA5933BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage stability across temperature, low dynamic impedance for tight regulation, AEC-Q101 qualification for automotive use, and SMA package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage-regulating diode with sharp reverse breakdown at 22 V under DC conditions. Its thermal resistance junction-to-lead is 50 °C/W, enabling stable 1.5 W dissipation at lead temperature ≤75 °C, and it maintains regulation down to 1 mA zener current.
The SZ prefix confirms AEC-Q101 qualification and automotive-grade process control, while the Pb-free SMA package (Case 403D) supports reflow soldering up to 260 °C for 10 seconds. ESD robustness exceeds 16 kV HBM, suitable for handling in uncontrolled environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9 V min / 22 V nom / 23.1 V max @ IZT = 17.5 mA - ensures ±5% regulation accuracy in feedback loops |
| Zener Impedance (ZZT) | 17 Ω max @ IZT = 17.5 mA - minimizes output voltage variation under load transients |
| Power Dissipation (PD) | 1.5 W @ TL = 75°C - supports continuous operation in compact PCB layouts with copper pad heatsinking |
| Leakage Current (IR) | 0.25 μA max @ VR = 16.7 V - prevents significant error current in high-impedance reference nodes |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection during board handling and assembly |
| Operating Temperature | −65°C to +150°C - enables deployment in under-hood automotive and industrial ambient environments |
Pinout & Package
SMA package (Case 403D), surface-mount, flat handling surface, cathode indicated by molded band. Dimensions conform to JEDEC DO-214AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node or voltage reference point; polarity must be observed to avoid forward conduction |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; forms return path for zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring PPAP compliance |
| Low Profile SMA Package | Enables high-density PCB layouts and compatibility with existing MELF-replacement footprints without redesign |
| 16 kV HBM ESD Robustness | Reduces risk of field failure due to electrostatic discharge during manufacturing or service |
| UL 94 V-0 Flammability Rating | Meets safety requirements for enclosed industrial and automotive enclosures |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and J-STD-609 Category 1 marking requirements |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Power Supply Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing 5 V or 3.3 V reference rails in microcontroller-based engine management systems exposed to load dump transients. IC Role / Device Role / Timing Role: Zener voltage reference providing stable bias for analog comparators and ADC references. Use Value: ±5% voltage tolerance and −65°C to +150°C operating range ensure reliable operation across vehicle lifetime and environmental extremes. |
Use Scenario: Clamping transient voltages on 24 V DC input rails in programmable logic controllers subjected to inductive switching noise. IC Role / Device Role / Timing Role: Shunt regulator absorbing surge energy to protect downstream DC-DC converters and FPGA power domains. Use Value: 1.5 W power rating and 17 Ω dynamic impedance limit clamped voltage excursion to ≤23.1 V during 100 ms surges. |
| Consumer AC-DC Adapter Feedback Network | Medical Diagnostic Equipment Voltage Monitor |
Use Scenario: Setting precise output voltage in isolated flyback converters used in USB-C PD adapters with tight regulatory compliance. IC Role / Device Role / Timing Role: Secondary-side voltage reference in optocoupler feedback loop for primary-side controller regulation. Use Value: Low 0.25 μA leakage at 16.7 V prevents reference drift and improves no-load efficiency in energy-efficient designs. |
Use Scenario: Monitoring battery-backed backup voltage in portable ultrasound devices where reference stability impacts image fidelity. IC Role / Device Role / Timing Role: Precision voltage threshold detector triggering low-battery alerts before critical system shutdown. Use Value: Tight 22 V nominal zener voltage with 17 Ω impedance ensures consistent trip point across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22LT1G | 0.3 W rating, SOT-23 package, 22 V ±5%, 55 Ω ZZT @ 5 mA - lower power and higher impedance | Best suited for low-current biasing or signal-level clamping, not 1.5 W power regulation | Select when space-constrained PCBs require SOT-23 footprint and power demand is ≤300 mW |
| 1N4742A | 1 W rating, DO-41 through-hole package, 22 V ±5%, 20 Ω ZZT @ 19 mA - legacy axial lead, higher thermal resistance | Applicable where manual assembly or prototyping with breadboards is required | Select only for through-hole prototypes or legacy repair; not suitable for automated SMT production or AEC-Q101 compliance |
Compared with BZX84-C22LT1G and 1N4742A, the SZ1SMA5933BT3G delivers higher power handling (1.5 W), lower dynamic impedance (17 Ω), and automotive qualification - making it the preferred choice for production-grade SMT power regulation where reliability and thermal performance are critical.
Availability
SZ1SMA5933BT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial power supplies, consumer AC-DC adapters, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for SZ1SMA5933BT3G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZ1SMA59xxBT3G series was designed specifically for automotive-grade voltage regulation and transient suppression, combining AEC-Q101 reliability with surface-mount manufacturability in the SMA package.
FAQ
What is the maximum power dissipation of SZ1SMA5933BT3G at 75°C lead temperature?
The SZ1SMA5933BT3G has a maximum DC power dissipation of 1.5 W at a lead temperature (TL) of 75°C. Above this temperature, power must be linearly derated at 20 mW/°C. This rating assumes measurement with zero lead length on a 1 in² copper pad on FR-4 board, as defined in the onsemi datasheet.
Is SZ1SMA5933BT3G qualified for automotive applications?
Yes, the SZ1SMA5933BT3G is AEC-Q101 qualified and PPAP capable. The "SZ" prefix explicitly denotes automotive-grade process control, site-specific change management, and extended reliability testing - distinguishing it from the commercial-grade 1SMA5933BT3G variant.
What is the zener voltage tolerance and test condition for SZ1SMA5933BT3G?
The SZ1SMA5933BT3G has a nominal zener voltage of 22 V with a tolerance of ±5%, guaranteed at thermal equilibrium. The specified limits (20.9 V min / 23.1 V max) are measured at IZT = 17.5 mA and TA = 25°C, per the onsemi Electrical Characteristics table.
Does SZ1SMA5933BT3G have ESD protection built-in?
Yes, the SZ1SMA5933BT3G features an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM). This level of robustness is inherent to the device structure and packaging, eliminating the need for additional external ESD protection in most handling and board-level scenarios.
What is the thermal resistance junction-to-lead (RJL) for SZ1SMA5933BT3G?
The thermal resistance junction-to-lead (RJL) for SZ1SMA5933BT3G is 50 °C/W. This value enables accurate thermal modeling when mounted on PCBs with copper pads, supporting reliable 1.5 W operation at lead temperatures up to 75°C without exceeding maximum junction temperature limits.
SZ1SMA5933BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZ1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 17.5 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SZ1SMA5933BT3G FAQ
1.How can I place an order for SZ1SMA5933BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5933BT3G 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 SZ1SMA5933BT3G reliable?
The price and inventory of SZ1SMA5933BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5933BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5933BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5933BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5933BT3G?
SZ1SMA5933BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5933BT3G 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 SZ1SMA5933BT3G?
For technical support, including SZ1SMA5933BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5933BT3G requirements.
6.How does Aetrix verify that SZ1SMA5933BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5933BT3G 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 SZ1SMA5933BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5933BT3G?
All SZ1SMA5933BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5933BT3G, 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 SZ1SMA5933BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5933BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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