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onsemi SZ1SMA5941BT3G
- Part No.:
- SZ1SMA5941BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5941BT3G.pdf
- Description:
- DIODE ZENER 47V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,145
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Product details
Overview
SZ1SMA5941BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 47 V, maximum zener impedance of 8.0 Ω at 67 mA test current, and reverse leakage current ≤0.25 μA at 35.8 V, used for precision voltage regulation in automotive power supplies and industrial sensor biasing circuits.
For engineers reviewing the SZ1SMA5941BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), AEC−Q101 qualification, thermal resistance (250 °C/W junction-to-ambient), and low-profile SMA package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable output voltage across varying load and line conditions. Its 47 V nominal zener voltage is specified at IZT = 67 mA with ±5% tolerance, and it exhibits temperature coefficient behavior typical of mid-voltage Zeners (≈+3.5 mV/°C near 47 V).
The SZ1SMA5941BT3G features a Pb-free SMA package (Case 403D) with cathode band marking, rated for 150 °C maximum junction temperature and 260 °C soldering peak temperature. It delivers 1.5 W power dissipation at TL = 75 °C with 50 °C/W junction-to-lead thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65 V (min) to 49.35 V (max) at IZT = 67 mA - defines regulated output range under standard test conditions |
| Power Dissipation (PD) | 1.5 W @ TL = 75 °C - supports continuous operation in thermally constrained PCB layouts |
| Zener Impedance (ZZT) | 8.0 Ω max @ IZT = 67 mA - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 35.8 V - enables low-quiescent-current bias networks in battery-powered systems |
| Thermal Resistance (RJA) | 250 °C/W - determines required copper area and airflow for thermal management in enclosed enclosures |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during board assembly without additional ESD protection |
Pinout & Package
SMA package (Case 403D), surface-mount, low-profile plastic case with molded cathode band polarity indicator. Dimensions: 4.5 × 2.7 × 2.1 mm (L × W × H). Cathode terminal marked by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased Zener terminal | Connected to higher-potential node to enable breakdown conduction and voltage clamping |
| Anode (unmarked end) | Reference/ground return path | Provides current return path to circuit common; must be routed with low-inductance trace for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements |
| ±5% zener voltage tolerance | Reduces need for post-assembly trimming in voltage reference designs |
| Low-profile SMA package | Enables high-density PCB layouts and compatibility with standard SMT pick-and-place equipment |
| 16 kV HBM ESD rating | Eliminates requirement for external ESD protection in final assembly handling |
| Pb-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile standards |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamping | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protects 5 V and 12 V microcontroller supply rails from load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role: Voltage clamp placed between rail and ground to shunt excess energy during ISO 7637-2 pulse 5a events. Use Value: Withstands 1.5 W peak dissipation and maintains <49.35 V clamping threshold to prevent downstream IC damage. | Use Scenario: Shields 4–20 mA current loop receiver inputs from field-induced surges in factory automation environments. IC Role / Device Role: Primary overvoltage protection element in front-end signal conditioning stage before instrumentation amplifier. Use Value: Low 8.0 Ω ZZT ensures fast response to >35 V transients while maintaining <0.25 μA leakage at 24 V nominal input. |
| Medical Sensor Bias Supply Regulation | Telecom DC-DC Converter Feedback Reference |
Use Scenario: Provides stable 47 V bias voltage for avalanche photodiode (APD) arrays in portable diagnostic imaging modules. IC Role / Device Role: Precision voltage reference source delivering low-noise, temperature-stable bias for high-gain analog front ends. Use Value: ±5% VZ tolerance and +3.5 mV/°C tempco enable calibration compensation within 0.5% accuracy over −40 to +85 °C. | Use Scenario: Sets output voltage in isolated flyback converter feedback network for 48 V telecom power systems. IC Role / Device Role: Secondary-side voltage reference connected to optocoupler input to regulate primary-side controller. Use Value: 1.5 W power rating accommodates feedback divider current plus optocoupler LED drive without derating at full load. |
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-C47LT1G | 300 mW rating, SOT-23 package, 45.6–48.4 V VZ range, 100 Ω ZZT | Lower power handling limits use to low-current references (<5 mA); unsuitable for transient clamping | Select when board space is critical and power dissipation remains <300 mW |
| 1N4750A | 1 W rating, DO-41 through-hole package, 44.65–49.35 V VZ, 10 Ω ZZT at 45 mA | Requires manual insertion or wave soldering; lacks AEC−Q101 qualification and HBM ESD rating | Select for legacy through-hole designs where automotive qualification is not required |
Compared with BZX84-C47LT1G and 1N4750A, the SZ1SMA5941BT3G uniquely combines AEC−Q101 qualification, 1.5 W surface-mount capability, and 8.0 Ω zener impedance-enabling compact, automotive-grade voltage regulation without layout or reliability compromises.
Availability
SZ1SMA5941BT3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical sensor bias supplies requiring stable component supply and long-term lifecycle support.
Supply support for SZ1SMA5941BT3G 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 1SMA59xxBT3G/SZ1SMA59xxBT3G series was designed specifically for high-reliability voltage regulation and transient suppression in automotive and industrial surface-mount power systems.
FAQ
What is the zener voltage tolerance for SZ1SMA5941BT3G?
The SZ1SMA5941BT3G has a zener voltage tolerance of ±5%, meaning its reverse breakdown voltage is guaranteed between 44.65 V and 49.35 V at the specified test current of 67 mA. This tolerance is explicitly defined in the Electrical Characteristics table of the official onsemi datasheet and applies across the full operating temperature range of −65 °C to +150 °C.
Is SZ1SMA5941BT3G qualified for automotive applications?
Yes, the SZ1SMA5941BT3G is AEC−Q101 qualified and PPAP capable, as confirmed in the "Features" section of the onsemi datasheet. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, and the device meets stress testing standards for temperature cycling, humidity, and mechanical shock required in engine control, body electronics, and ADAS subsystems.
What is the maximum power dissipation of SZ1SMA5941BT3G at ambient temperature?
The SZ1SMA5941BT3G dissipates up to 0.5 W at TA = 25 °C, with linear derating of 4.0 mW/°C above that temperature. At 75 °C lead temperature, it supports 1.5 W, but ambient-limited operation requires thermal design to stay within the 250 °C/W junction-to-ambient thermal resistance limit to avoid exceeding the 150 °C maximum junction temperature.
Does SZ1SMA5941BT3G have Pb-free construction?
Yes, the SZ1SMA5941BT3G is Pb-free and RoHS-compliant, as stated in both the "Features" and "Mechanical Characteristics" sections of the onsemi datasheet. The "G" suffix in the part number and the "Pb−Free Package" designation confirm compliance with JEDEC J-STD-020 moisture sensitivity and reflow profile standards for lead-free assembly.
What is the reverse leakage current specification for SZ1SMA5941BT3G?
The reverse leakage current for SZ1SMA5941BT3G is ≤0.25 μA at VR = 35.8 V, as specified in the Electrical Characteristics table. This value is measured at TA = 25 °C and reflects the device's ability to minimize standby current in high-impedance bias networks, such as those used in precision analog sensor interfaces or low-power monitoring circuits.
SZ1SMA5941BT3G 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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 67 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 35.8 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
SZ1SMA5941BT3G FAQ
1.How can I place an order for SZ1SMA5941BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5941BT3G 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 SZ1SMA5941BT3G reliable?
The price and inventory of SZ1SMA5941BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5941BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5941BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5941BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5941BT3G?
SZ1SMA5941BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5941BT3G 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 SZ1SMA5941BT3G?
For technical support, including SZ1SMA5941BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5941BT3G requirements.
6.How does Aetrix verify that SZ1SMA5941BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5941BT3G 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 SZ1SMA5941BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5941BT3G?
All SZ1SMA5941BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5941BT3G, 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 SZ1SMA5941BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5941BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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