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onsemi 1SMB5933BT3
- Part No.:
- 1SMB5933BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5933BT3.pdf
- Description:
- DIODE ZENER 22V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,171
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Product details
Overview
1SMB5933BT3 from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 22 V (±5%), maximum Zener impedance of 17 Ω at 17.5 mA test current, and reverse leakage current ≤0.25 μA at 16.7 V. It operates across −65 °C to +150 °C and is qualified to AEC−Q101 for automotive applications.
For engineers reviewing the 1SMB5933BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (226 °C/W at TA = 25 °C), surge power capability (up to 100 W non-repetitive), Pb-free SMB package compatibility, and ESD robustness (>16 kV HBM).
Technical Context
This device functions as a precision DC voltage reference and overvoltage clamp in low-power analog and power supply circuits. Its 22 V nominal Zener voltage targets intermediate rail regulation, transient suppression, and feedback sensing in 24 V systems.
Thermal derating begins at 25 °C (4.4 mW/°C) and 75 °C (25 mW/°C), reflecting dual thermal paths-junction-to-ambient (RJA = 226 °C/W) and junction-to-lead (RJL = 40 °C/W). The SMB package (Case 403A) supports top- or bottom-side PCB mounting with modified L-bend leads for enhanced pad adhesion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9–23.1 V (±5% tolerance at IZT = 17.5 mA; defines stable regulation range) |
| Zener Impedance (ZZT) | 17 Ω max at IZT = 17.5 mA (low dynamic impedance ensures minimal output voltage variation under load changes) |
| Max Power Dissipation (PD) | 550 mW @ TA = 25 °C (derates linearly to zero at ~150 °C; sets continuous operating limit on FR-4 board) |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 16.7 V (ensures negligible standby current in high-impedance bias networks) |
| Thermal Resistance (RJA) | 226 °C/W (indicates heat dissipation capability on standard PCB; requires thermal relief design for sustained 550 mW) |
| ESD Rating | Class 3 (>16 kV HBM) (supports handling in uncontrolled environments without additional protection circuitry) |
| Operating Temperature | −65 °C to +150 °C (enables use in under-hood automotive, industrial control, and outdoor power electronics) |
Pinout & Package
1SMB5933BT3 uses the SMB (DO-214AA) plastic surface-mount package (Case 403A), featuring a cathode band marking and modified L-bend leads for reliable solder joint formation. The package is void-free, UL 94 V-0 rated, and Pb-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in regulation or clamping configuration; forms return path for Zener current |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 22 V reference when reverse biased; polarity band identifies this terminal on PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| 3 W steady-state power rating | Enables robust voltage clamping in 24 V automotive and industrial power rails without external heatsinking |
| AEC−Q101 qualification | Validated reliability for automotive ECUs, body control modules, and ADAS sensor interfaces |
| Flat handling surface | Improves pick-and-place accuracy during automated SMT assembly, reducing placement misalignment risk |
| Top- or bottom-side mounting support | Allows flexible PCB layout in space-constrained modules where component height or thermal path direction matters |
| ESD Class 3 (>16 kV HBM) | Eliminates need for discrete ESD protection in front-end signal conditioning stages |
Applications
| Automotive Body Control Module | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping 24 V supply transients induced by relay switching or load dump in BCM microcontroller power domains. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage protector for 3.3 V/5 V LDO input rails. Use Value: Prevents LDO damage during ISO 7637-2 pulse 1/2a events by clamping voltage to ≤23.1 V before downstream ICs exceed absolute maximum ratings. |
Use Scenario: Protecting 24 V digital input channels from field-wiring-induced surges in programmable logic controllers. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed before optocoupler input stage. Use Value: Limits input voltage to safe levels (<23.1 V) during 1 kV/500 A surge events, preserving optocoupler CTR and long-term isolation integrity. |
| DC-DC Feedback Reference | Low-Power Sensor Biasing |
Use Scenario: Providing precise 22 V reference for TL431-based adjustable flyback controller feedback network. IC Role / Device Role / Timing Role: Stable Zener reference setting upper threshold of error amplifier compensation loop. Use Value: Maintains ±5% output voltage accuracy over temperature (−40 °C to +125 °C) due to tight VZ tolerance and low ZZT. |
Use Scenario: Biasing high-impedance analog sensors (e.g., RTDs, strain gauges) requiring stable excitation voltage in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-leakage (≤0.25 μA) voltage reference source for ratiometric measurement circuits. Use Value: Minimizes measurement offset drift caused by reference current injection into sensor bridge legs, improving sub-0.1% system accuracy. |
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 | 22 V ±5%, 300 mW rating, SOT-23 package, RJA = 350 °C/W | Limited to lower-power biasing; unsuitable for 550 mW clamping duty | Select when board space is critical and power dissipation remains <300 mW |
| SMBJ22A | 22 V standoff, 600 W peak surge rating, TVS diode (not Zener), bidirectional | Designed for fast transient suppression (8/20 µs), not precision DC regulation | Select only for surge-only protection; not interchangeable for voltage reference use |
Compared with BZX84-C22LT1G and SMBJ22A, the 1SMB5933BT3 uniquely balances 3 W continuous power, ±5% Zener tolerance, and AEC−Q101 qualification-making it optimal for automotive and industrial DC regulation where both precision and ruggedness are required.
Availability
1SMB5933BT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection, and DC-DC feedback reference circuits requiring stable component supply, AEC−Q101 compliance, and Pb-free manufacturing.
Supply support for 1SMB5933BT3 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMB5933BT3 belongs to the 1SMB59xxBT3/SZ1SMB59xxT3G series-a family of 3 W surface-mount Zener regulators engineered for high-reliability voltage reference and clamping in harsh-environment electronics.
FAQ
What is the Zener voltage tolerance of the 1SMB5933BT3?
The 1SMB5933BT3 has a Zener voltage tolerance of ±5%, with a specified range of 20.9 V to 23.1 V at IZT = 17.5 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 7, November 2011), and applies to all devices marked "933B" in the 1SMB59xxBT3 series.
Is the 1SMB5933BT3 suitable for automotive applications?
Yes, the 1SMB5933BT3 is AEC−Q101 qualified and PPAP capable, as explicitly stated in the Features section of the datasheet. The "SZ" prefix variant (e.g., SZ1SMB5933BT3G) is designated for automotive use, but the 1SMB5933BT3 itself shares identical electrical and reliability specifications and is widely deployed in automotive body control modules and sensor interfaces.
What is the maximum continuous power dissipation for the 1SMB5933BT3 at room temperature?
The 1SMB5933BT3 delivers 550 mW maximum steady-state power dissipation at TA = 25 °C on an FR-4 board with recommended footprint, per the Maximum Ratings table. Power must be linearly derated above 25 °C at 4.4 mW/°C, reaching zero at approximately 150 °C ambient.
Does the 1SMB5933BT3 have Pb-free packaging?
Yes-the "G" suffix in the ordering code (1SMB5933BT3G) indicates Pb-free packaging, and the datasheet confirms Pb-free packages are available for the entire 1SMB59xxBT3 series. The device meets RoHS Directive 2011/65/EU requirements and uses matte tin lead finish.
What is the reverse leakage current specification for the 1SMB5933BT3?
The 1SMB5933BT3 exhibits reverse leakage current (IR) ≤0.25 μA at VR = 16.7 V, as specified in the Electrical Characteristics table. This ultra-low leakage enables use in high-impedance bias networks and precision sensor excitation circuits without introducing measurable error.
1SMB5933BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 17.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB5933BT3 FAQ
1.How can I place an order for 1SMB5933BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5933BT3 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 1SMB5933BT3 reliable?
The price and inventory of 1SMB5933BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5933BT3 is usually 5 days.
3.What payment methods are accepted for 1SMB5933BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5933BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5933BT3?
1SMB5933BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5933BT3 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 1SMB5933BT3?
For technical support, including 1SMB5933BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5933BT3 requirements.
6.How does Aetrix verify that 1SMB5933BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB5933BT3 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 1SMB5933BT3 meets industry standards.
7.What is the process for return or replacement of 1SMB5933BT3?
All 1SMB5933BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5933BT3, 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 1SMB5933BT3 part is unused and in its original packaging.
Return procedure for 1SMB5933BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5933BT3 Tags
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