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onsemi 1SMA5933BT3
- Part No.:
- 1SMA5933BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5933BT3.pdf
- Description:
- DIODE ZENER 22V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,748
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Product details
Overview
1SMA5933BT3 from onsemi is a 1.5 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 from −65 °C to +150 °C and is AEC-Q101 qualified for automotive power rail regulation and ESD-protected voltage clamping.
For engineers reviewing the 1SMA5933BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 22 V regulation tolerance, low 17 Ω dynamic impedance at IZT, Pb-free SMA package compatibility with automated SMT assembly, and Class 3 (＞16 kV) HBM ESD rating for robust board-level protection.
Technical Context
This device functions as a precision voltage reference and overvoltage clamp in DC power rails. Its zener breakdown is specified at IZT = 17.5 mA with VZ = 20.9–23.1 V, and it maintains stable regulation down to IZK = 0.5 mA where ZZK ≤ 650 Ω.
Thermal design is constrained by RJL = 50 °C/W (junction-to-lead) and RJA = 250 °C/W (junction-to-ambient), requiring PCB copper thermal relief for sustained 1.5 W dissipation. The SMA package (Case 403D-02) supports top-slide or bottom-mount placement with flat handling surface and UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9–23.1 V @ IZT = 17.5 mA - defines regulated output range under nominal bias |
| Zener Impedance (ZZT) | 17 Ω max @ IZT - ensures minimal voltage deviation during load transients |
| Max DC Power Dissipation | 1.5 W @ TL = 75 °C - sets thermal limit for zero-lead-length mounting on FR-4 |
| Reverse Leakage Current | ≤0.25 μA @ VR = 16.7 V - guarantees low quiescent current in standby regulation |
| ESD Rating (HBM) | Class 3 (>16 kV) - enables direct integration into unshielded automotive sensor interfaces |
| Operating Temperature | −65 °C to +150 °C - supports under-hood and industrial control environments |
| Polarity Indicator | Cathode band - provides unambiguous orientation for automated optical inspection |
Pinout & Package
The 1SMA5933BT3 uses the SMA (DO-214AC) surface-mount package (Case 403D-02), measuring 4.06–4.57 mm in length (E), 2.29–2.92 mm in width (D), and 1.97–2.20 mm in height (A). Cathode is marked by a molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band End) | Zener Anode Connection Point | Connected to higher-potential rail; reverse-biased operation requires cathode at positive potential relative to anode |
| Anode (Opposite Band) | Zener Cathode Connection Point | Connected to ground or lower-potential node; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive power management systems requiring PPAP documentation and stress testing |
| Low Profile SMA Package | Height ≤2.2 mm enables use in space-constrained modules and stacked PCB assemblies |
| Flat Handling Surface | Ensures consistent pick-and-place accuracy and reduces tombstoning risk during reflow |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| UL 94 V-0 Flammability | Prevents flame propagation in high-density power supply enclosures and EV battery management units |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Regulating 24 V supply rail for microcontroller I/O buffers and CAN transceiver biasing in BCMs. IC Role / Device Role / Timing Role: Zener voltage clamp protecting downstream logic from load-dump transients up to ±35 V. Use Value: 22 V nominal breakdown with 17 Ω ZZT limits rail excursion to <25 V during 100 ms surges, preserving MCU reset integrity. | Use Scenario: Clamping 0–10 V analog sensor inputs against ESD events in factory-floor PLCs. IC Role / Device Role / Timing Role: Primary overvoltage protector placed before instrumentation amplifier input stage. Use Value: Class 3 (＞16 kV) HBM rating absorbs contact discharge without degradation, eliminating need for external TVS cascading. |
| DC-DC Converter Feedback Reference | LED Driver Current Sense Bias |
Use Scenario: Providing stable 22 V reference for optocoupler feedback in isolated 48 V → 12 V flyback converters. IC Role / Device Role / Timing Role: Precision shunt regulator setting error amplifier reference point in secondary-side control loop. Use Value: ±5% VZ tolerance and 17 Ω ZZT ensure output voltage regulation within ±1.5% across line/load variations. | Use Scenario: Biasing current-sense resistor network in constant-current LED drivers for street lighting. IC Role / Device Role / Timing Role: Voltage clamp limiting sense node swing during MOSFET switching transitions. Use Value: Low 0.25 μA leakage at 16.7 V prevents measurement offset drift in 100 μA–2 A sensing ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | Through-hole DO-41 package; 12 V nominal; 20 Ω ZZT @ 21 mA; no AEC-Q101 qualification | Not suitable for SMT production or automotive under-hood use; limited to prototyping and non-automotive power supplies | Select only for legacy through-hole designs where board real estate and reliability requirements are less stringent |
| BZX84-C22 | SOT-23 package; 22 V nominal; 55 Ω ZZT @ 5 mA; 300 mW power rating; no HBM ESD rating | Lower power handling and higher impedance reduce transient suppression capability in 24 V rail clamping | Prefer for low-current biasing where footprint is critical but surge immunity is secondary |
Compared with 1SMA5933BT3, the 1N4742A lacks SMT compatibility and automotive qualification, while the BZX84-C22 trades 1.5 W power handling and 17 Ω impedance for smaller size-making 1SMA5933BT3 optimal for high-reliability 22 V clamping where thermal margin and ESD robustness are essential.
Availability
1SMA5933BT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input protection, and isolated DC-DC converter feedback circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for 1SMA5933BT3 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 focused on energy-efficient electronics for automotive, industrial, cloud, and IoT applications.
The 1SMA59xxBT3 series was designed specifically for high-reliability surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing AEC-Q101 qualification, low-profile packaging, and robust ESD performance.
FAQ
What is the exact zener voltage tolerance for 1SMA5933BT3?
The 1SMA5933BT3 has a zener voltage tolerance of ±5%, with minimum, nominal, and maximum values of 20.9 V, 22.0 V, and 23.1 V respectively, measured at IZT = 17.5 mA and thermal equilibrium. This tolerance is guaranteed per the datasheet's Note 3 and applies across the full operating temperature range when derated per thermal curves.
Is 1SMA5933BT3 suitable for automotive applications?
Yes, the 1SMA5933BT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Features section. Its construction, thermal ratings, and ESD performance meet automotive-grade requirements for under-hood and body electronics, including use in BCMs and power distribution units where reliability under thermal cycling and electrical stress is critical.
What is the maximum steady-state power dissipation for 1SMA5933BT3 at 25°C ambient?
The 1SMA5933BT3 has a maximum DC power dissipation of 0.5 W at TA = 25°C, derating linearly at 4.0 mW/°C above that temperature. This value assumes use on an FR-4 board with onsemi's minimum recommended footprint; exceeding this limit without thermal relief risks junction overheating and parametric shift.
Does 1SMA5933BT3 have a Pb-free package option?
Yes, the "G" suffix in the ordering part number (e.g., SZ/1SMA5933BT3G) denotes the Pb-free version of 1SMA5933BT3. The datasheet confirms Pb-free packages are available and specifies compliance with RoHS Directive 2011/65/EU, with soldering profiles aligned to JEDEC J-STD-020 Level 1.
How is polarity indicated on the 1SMA5933BT3 package?
Polarity on the 1SMA5933BT3 is indicated by a molded cathode band on the SMA (DO-214AC) case, as shown in the Package Dimensions diagram on page 5 of the datasheet. This band aligns with Pin 1 (cathode) and must be oriented toward the higher-potential node in reverse-bias configuration to enable proper zener regulation.
1SMA5933BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA5933BT3 FAQ
1.How can I place an order for 1SMA5933BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5933BT3 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 1SMA5933BT3 reliable?
The price and inventory of 1SMA5933BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5933BT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5933BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5933BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5933BT3?
1SMA5933BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5933BT3 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 1SMA5933BT3?
For technical support, including 1SMA5933BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5933BT3 requirements.
6.How does Aetrix verify that 1SMA5933BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5933BT3 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 1SMA5933BT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5933BT3?
All 1SMA5933BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5933BT3, 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 1SMA5933BT3 part is unused and in its original packaging.
Return procedure for 1SMA5933BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA5933BT3 Tags
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