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onsemi 1SMB5941BT3
- Part No.:
- 1SMB5941BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5941BT3.pdf
- Description:
- DIODE ZENER 47V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,488
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Product details
Overview
1SMB5941BT3 from onsemi is a 3 W surface-mount Zener diode with nominal Zener voltage of 47 V (±5%), maximum Zener impedance of 8 Ω at 67 mA test current, and reverse leakage current ≤0.25 μA at 35.8 V. It operates from −65 °C to +150 °C and is used for precision voltage regulation and overvoltage protection in DC power supplies.
For engineers reviewing the 1SMB5941BT3 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 1000 W peak), Pb-free SMB package compatibility, and AEC-Q101 qualification status for automotive-grade reliability.
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 low dynamic impedance (8 Ω) under that condition, enabling stable regulation under moderate load variation.
Thermal design relies on junction-to-ambient thermal resistance of 226 °C/W (at TA = 25 °C) and junction-to-lead resistance of 40 °C/W (at TL = 75 °C), supporting PCB-level heat dissipation via lead conduction and ambient convection. The SMB package (Case 403A) features modified L-bend leads and a cathode polarity band for automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal (44.65–49.35 V range); sets precise clamping level for voltage regulation or transient suppression. |
| Power Dissipation (PD) | 3.0 W at TL = 75 °C; derates linearly above 75 °C at 25 mW/°C - defines max continuous power under lead-heatsink conditions. |
| Zener Impedance (ZZT) | 8 Ω max at IZT = 67 mA; ensures minimal output voltage deviation under changing load current. |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 35.8 V; guarantees negligible standby current in high-impedance bias networks. |
| Thermal Resistance (RJA) | 226 °C/W at TA = 25 °C; determines temperature rise per watt on standard FR-4 board with recommended footprint. |
| ESD Rating | Class 3 (>16 kV HBM); supports robust handling in automated SMT assembly without ESD mitigation overhead. |
| Operating Temperature | −65 °C to +150 °C; enables use in under-hood automotive, industrial control, and outdoor power electronics. |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode indicated by polarity band; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H); Pb-free, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in Zener configuration | Connected to lower-potential side of regulated circuit; establishes reference point for reverse-biased operation. |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to higher-potential rail; maintains stable 47 V relative to anode when reverse biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| 3 W steady-state power rating | Supports higher-energy clamping than 1 W Zeners, reducing need for parallel devices in 12–48 V supply rails. |
| ±5% Zener voltage tolerance | Enables tighter regulation without post-production trimming; suitable for cost-sensitive industrial voltage references. |
| AEC-Q101 qualified (SZ variant) | Validated for automotive applications including body control modules and infotainment power conditioning. |
| Flat handling surface | Improves pick-and-place accuracy during high-speed SMT assembly, minimizing tombstoning risk. |
| Modified L-bend leads | Increases solder joint area and mechanical strength on PCB pads, enhancing thermal and mechanical reliability. |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters for programmable logic controllers. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed 47 V reference to optocoupler input stage. Use Value: Maintains ±1% output regulation across line/load transients due to low 8 Ω ZZT and 3 W thermal headroom. |
Use Scenario: Protecting microcontroller I/O pins from load-dump surges in 24 V commercial vehicle ECUs. IC Role / Device Role / Timing Role: Standby clamping diode placed between 24 V rail and ground, triggered only during >40 V transients. Use Value: Absorbs up to 1000 W non-repetitive surge (per Figure 2) without failure, preserving downstream logic integrity. |
| Test Equipment Reference Source | LED Driver Overvoltage Protection |
|
Use Scenario: Generating calibrated 47 V reference in portable multimeter calibration circuits. IC Role / Device Role / Timing Role: Precision Zener element in buffered reference divider network with low tempco (<10 mV/°C above 40 V). Use Value: Delivers <0.25 μA leakage at 35.8 V, minimizing error contribution in high-impedance reference paths. |
Use Scenario: Safeguarding constant-current LED driver ICs against open-circuit overvoltage events. IC Role / Device Role / Timing Role: Shunt limiter across LED string terminals, conducting only when forward voltage exceeds 47 V. Use Value: Prevents driver latch-up or internal FET breakdown by clamping within 100 ns (typical response time), verified per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5365B | Same 47 V nominal Zener voltage but 5 W rating; TO-204AA (DO-204AL) through-hole package; RJA = 50 °C/W (heatsink-dependent). | Requires PCB through-hole mounting and external heatsink; unsuitable for space-constrained SMT designs. | Select when higher continuous power or legacy through-hole compatibility is required; not drop-in for SMB footprint. |
| SZ1SMB5941BT3G | Identical electrical specs and SMB package; differs only in AEC-Q101 qualification, PPAP capability, and SZ prefix for automotive traceability. | Required for Tier-1 automotive production; supports full change control and lot traceability per IATF 16949. | Choose for automotive programs where PPAP documentation and AEC-Q101 compliance are mandatory; otherwise identical performance. |
Compared with 1SMB5941BT3, 1N5365B offers higher power but demands through-hole layout and thermal management, while SZ1SMB5941BT3G delivers identical electrical behavior with certified automotive qualification - making the latter essential for vehicle systems and the former viable only for non-automotive high-power needs.
Availability
1SMB5941BT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU protection, test equipment reference circuits, and LED driver overvoltage safeguards requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1SMB5941BT3 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, cloud, and consumer markets.
The 1SMB59xxBT3G series was designed for high-reliability surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding environments - particularly targeting automotive subsystems and ruggedized industrial electronics.
FAQ
What is the Zener voltage tolerance of the 1SMB5941BT3?
The 1SMB5941BT3 has a Zener voltage tolerance of ±5%, meaning its actual breakdown voltage falls between 44.65 V and 49.35 V at IZT = 67 mA and TL = 30 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies to all devices in the 1SMB59xxBT3G series unless otherwise noted.
Is the 1SMB5941BT3 suitable for automotive applications?
The standard 1SMB5941BT3 is not AEC-Q101 qualified; however, its automotive-grade counterpart SZ1SMB5941BT3G shares identical electrical and mechanical specifications and is fully AEC-Q101 qualified and PPAP capable. For automotive use, engineers must specify the SZ-prefix part - the 1SMB5941BT3 itself is intended for industrial and commercial applications.
What is the maximum peak surge power the 1SMB5941BT3 can handle?
The 1SMB5941BT3 can withstand up to 1000 W of non-repetitive peak surge power for pulse widths ≤10 ms, as shown in Figure 2 of the onsemi datasheet. This rating assumes TJ = 25 °C prior to the pulse and applies to rectangular waveforms - critical for evaluating transient protection capability in 24 V or 48 V power systems.
Does the 1SMB5941BT3 have a Pb-free construction?
Yes, the "G" suffix in the full orderable part number 1SMB5941BT3G (commonly referenced as 1SMB5941BT3 in distribution channels) denotes Pb-free packaging per onsemi's RoHS compliance program. The device uses matte tin-plated leads and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements.
What is the thermal resistance from junction-to-ambient for the 1SMB5941BT3?
The 1SMB5941BT3 has a junction-to-ambient thermal resistance (RJA) of 226 °C/W when mounted on a standard FR-4 PCB with the recommended footprint per the datasheet. This value assumes no additional heatsinking and defines the temperature rise per watt dissipated - essential for calculating safe operating area in continuous regulation applications.
1SMB5941BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 67 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 35.8 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
1SMB5941BT3 FAQ
1.How can I place an order for 1SMB5941BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5941BT3 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 1SMB5941BT3 reliable?
The price and inventory of 1SMB5941BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5941BT3 is usually 5 days.
3.What payment methods are accepted for 1SMB5941BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5941BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5941BT3?
1SMB5941BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5941BT3 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 1SMB5941BT3?
For technical support, including 1SMB5941BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5941BT3 requirements.
6.How does Aetrix verify that 1SMB5941BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB5941BT3 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 1SMB5941BT3 meets industry standards.
7.What is the process for return or replacement of 1SMB5941BT3?
All 1SMB5941BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5941BT3, 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 1SMB5941BT3 part is unused and in its original packaging.
Return procedure for 1SMB5941BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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