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onsemi 1SMA5941BT3
- Part No.:
- 1SMA5941BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5941BT3.pdf
- Description:
- DIODE ZENER 47V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,520
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Product details
Overview
1SMA5941BT3 from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 47 V (±5%), 8.0 Ω maximum zener impedance at 67 mA test current, and 0.25 μA reverse leakage at 35.8 V. It operates from −65 °C to +150 °C and is rated for 1.5 W power dissipation at 75 °C lead temperature, used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1SMA5941BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 47 V nominal breakdown voltage, low 8.0 Ω dynamic impedance, AEC−Q101 qualification status, Pb−free SMA package compatibility, and thermal derating behavior above 75 °C.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its zener voltage is specified at IZT = 67 mA with ±5% tolerance, and it exhibits a positive temperature coefficient above ~5 V, confirmed by typical θVZ = +14 mV/°C at 47 V per manufacturer curves.
The 1SMA5941BT3 uses a void-free transfer-molded plastic SMA (Case 403D−02) package with cathode indicated by a molded band, rated for 260 °C soldering (10 s), UL 94 V−0 flammability, and ESD robustness >16 kV HBM - enabling reliable use in automotive and industrial PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65 V min / 47.0 V nom / 49.35 V max @ IZT = 67 mA - defines stable regulation point for feedback networks requiring ±5% tolerance. |
| Zener Impedance (ZZT) | 8.0 Ω max @ IZT = 67 mA - ensures minimal output voltage variation under load transients in regulated supplies. |
| Power Dissipation (PD) | 1.5 W @ TL = 75 °C - requires ≥1 in² copper pad on FR-4 for full rating; derates linearly to zero at 150 °C junction. |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 35.8 V - enables low-error biasing in high-impedance sensing paths without loading error. |
| Thermal Resistance (RJA) | 250 °C/W @ TA = 25 °C - dictates board-level thermal design requirements for ambient operation up to 75 °C. |
| ESD Rating | Class 3 (>16 kV) per HBM - supports handling and assembly in non-ESD-controlled environments without added protection. |
Pinout & Package
1SMA5941BT3 uses the SMA (DO-214AC, Case 403D−02) surface-mount package: 4.06–4.57 mm body width (E), 2.29–2.92 mm length (D), 1.97–2.20 mm height (A), with cathode marked by a visible band. Leads are solderable, corrosion-resistant, and rated for 260 °C/10 s reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to higher-potential node in zener regulator configuration; polarity must be observed to avoid forward conduction. |
| Anode | Reverse-biased cathode return path | Typically tied to system ground or lower-voltage rail; completes reverse-bias path for controlled breakdown operation. |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive power supply designs. |
| AEC−Q101 qualified | Validated for automotive applications including engine control units and body electronics where reliability under thermal cycling is critical. |
| Pb−free (G-suffix compatible) | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for standard SMT assembly. |
| Low-profile SMA package | 0.76–1.52 mm lead length (L) and 1.97–2.20 mm height (A) support compact layouts and automated optical inspection (AOI). |
| ESD robustness >16 kV HBM | Eliminates need for external ESD protection in front-end voltage clamp circuits, reducing BOM count and board area. |
Applications
| Switch-Mode Power Supply Feedback | Automotive Load Dump Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference establishing 47 V threshold for error amplifier comparison. Use Value: Tight 8.0 Ω ZZT minimizes regulation error across line/load variations, improving output accuracy to ±1.5%. |
Use Scenario: Clamping transient overvoltages during alternator load dump events in 12 V vehicle systems. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting surge current when bus voltage exceeds 47 V. Use Value: 1.5 W rating and 0.25 μA leakage enable reliable clamping without parasitic loading during normal operation. |
| Industrial Sensor Biasing | Programmable Logic Controller Input Protection |
Use Scenario: Providing stable 47 V bias to high-voltage analog front-end stages in pressure or current sensors. IC Role / Device Role / Timing Role: Low-drift voltage reference source for signal conditioning amplifiers. Use Value: Positive temperature coefficient (+14 mV/°C) compensates for common op-amp offset drift, improving long-term stability. |
Use Scenario: Protecting digital input pins of PLC I/O modules against accidental 48 V DC field wiring faults. IC Role / Device Role / Timing Role: Standby-mode overvoltage clamp absorbing fault energy before upstream fusing activates. Use Value: UL 94 V−0 flammability rating and 260 °C solder compatibility ensure safety compliance and rework resilience. |
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-C47 | 300 mW SOT-23 device; 45.6–48.4 V range; ZZT = 90 Ω @ 5 mA - significantly higher impedance and lower power. | Suitable only for low-current bias/reference use; cannot replace 1SMA5941BT3 in 67 mA regulation or surge clamping roles. | Select BZX84-C47 only for space-constrained, low-power biasing where 1.5 W capability is unnecessary. |
| 1N4750A | 1 W through-hole DO-41; 44.65–49.35 V range; ZZT = 10 Ω @ 65 mA - near-identical electrical specs but incompatible package and mounting. | Requires PCB redesign for through-hole insertion and wave soldering; not suitable for automated SMT lines. | Choose 1N4750A only for legacy through-hole designs or prototyping where SMA footprint is unavailable. |
Compared with BZX84-C47 and 1N4750A, the 1SMA5941BT3 uniquely delivers 1.5 W SMT-compatible regulation with 8.0 Ω impedance and AEC−Q101 qualification - making it the sole option for high-reliability, high-current surface-mount zener applications.
Availability
1SMA5941BT3 is available at Aetrix Electronics and suitable for switch-mode power supplies, automotive load dump protection circuits, and industrial sensor biasing requiring stable component supply with full traceability and lifecycle management.
Supply support for 1SMA5941BT3 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, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1SMA5941BT3 belongs to the 1SMA59xxBT3/SZ1SMA59xxBT3G family of 1.5 W surface-mount Zener regulators designed specifically for high-reliability voltage reference and overvoltage protection in automotive and industrial PCBs.
FAQ
What is the exact zener voltage tolerance for 1SMA5941BT3?
The 1SMA5941BT3 has a guaranteed ±5% zener voltage tolerance, with minimum, nominal, and maximum values of 44.65 V, 47.0 V, and 49.35 V respectively, measured at IZT = 67 mA and thermal equilibrium. This tolerance is explicitly defined in the Electrical Characteristics table on page 2 of the official datasheet and applies to all units bearing the "SZ/1SMA5941BT3, G" ordering code.
Is 1SMA5941BT3 qualified for automotive applications?
Yes, the 1SMA5941BT3 is AEC−Q101 qualified and PPAP capable when ordered with the SZ prefix (e.g., SZ/1SMA5941BT3, G), as stated in the Features section of the datasheet. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD - confirming suitability for under-hood and chassis-mounted automotive electronics.
What is the maximum reverse leakage current for 1SMA5941BT3 and at what voltage is it specified?
The 1SMA5941BT3 has a maximum reverse leakage current of 0.25 μA, specified at VR = 35.8 V (80% of nominal VZ). This value is confirmed in the Electrical Characteristics table on page 2 and reflects worst-case leakage under stable DC bias conditions at 25 °C ambient.
Can 1SMA5941BT3 be used in place of 1N4750A?
No - while 1SMA5941BT3 and 1N4750A share identical zener voltage ranges (44.65–49.35 V) and similar ZZT, they differ fundamentally in package (SMA vs. DO-41), mounting method (SMT vs. through-hole), and power rating (1.5 W vs. 1.0 W). Substitution requires PCB redesign and is not recommended without thermal and layout validation.
What does the "G" suffix indicate in 1SMA5941BT3G?
The "G" suffix in 1SMA5941BT3G denotes a Pb−free version compliant with RoHS Directive 2011/65/EU, using matte tin lead finish and meeting JEDEC J-STD-020 MSL1 requirements. The base part number 1SMA5941BT3 may be either Pb−free or SnPb depending on date code and lot traceability, but "G" guarantees Pb−free construction.
1SMA5941BT3 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):
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA5941BT3 FAQ
1.How can I place an order for 1SMA5941BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5941BT3 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 1SMA5941BT3 reliable?
The price and inventory of 1SMA5941BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5941BT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5941BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5941BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5941BT3?
1SMA5941BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5941BT3 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 1SMA5941BT3?
For technical support, including 1SMA5941BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5941BT3 requirements.
6.How does Aetrix verify that 1SMA5941BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5941BT3 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 1SMA5941BT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5941BT3?
All 1SMA5941BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5941BT3, 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 1SMA5941BT3 part is unused and in its original packaging.
Return procedure for 1SMA5941BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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