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Diodes Incorporated 1SMB5941B-13
- Part No.:
- 1SMB5941B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5941B-13.pdf
- Description:
- DIODE ZENER 47V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,970
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Product details
Overview
1SMB5941B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage of 47V (±5% tolerance), maximum zener impedance of 1000Ω at 67mA test current, and ESD rating >16kV (HBM). It operates from −65°C to +150°C and is used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the 1SMB5941B-13 datasheet, 1SMB5941B-13 pinout, 1SMB5941B-13 application, or 1SMB5941B-13 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (226°C/W), power derating above +25°C, and SMB package compatibility with automated SMT assembly.
Technical Context
This Zener diode functions as a two-terminal voltage reference device, maintaining stable reverse breakdown voltage across its cathode–anode terminals under controlled current conditions. Its 47V nominal zener voltage is specified at IZT = 67mA, with dynamic impedance (ZZT) ≤1000Ω and knee impedance (ZZK) ≤1300Ω at IZK = 1mA.
Thermal performance is defined for FR-4 PCB mounting per AP02001 pad layout: RθJA = 226°C/W and RθJT = 25°C/W. Power dissipation is rated at 550mW at +25°C, derating linearly at 4.4mW/°C above ambient, down to 3.0W at terminal temperature TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47V nominal, 44.65–49.35V range at IZT = 67mA - defines regulated output voltage under design current |
| Power Dissipation (PD) | 550mW at TA = +25°C - sets maximum continuous DC power handling on standard PCB |
| Zener Impedance (ZZT) | ≤1000Ω at IZT = 67mA - determines voltage regulation stability under load transients |
| Reverse Leakage (IR) | ≤0.25µA at VR = 35.8V - ensures minimal quiescent current in standby regulation circuits |
| ESD Rating | Class 3 (>16kV HBM) - enables robust handling in unshielded manufacturing and field environments |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood applications without derating |
| Package | SMB (DO-214AA) - standardized 3.3–3.94mm × 4.06–4.57mm surface-mount footprint compatible with IPC-7351B |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with cathode band marking; dimensions: 3.30–3.94mm (L) × 4.06–4.57mm (W) × 1.96–2.21mm (H); weight ≈ 0.096g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path for regulation loop |
| Cathode | Zener breakdown terminal / voltage regulation output | Connected to regulated rail; reverse-biased to maintain 47V reference against input variations |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W terminal power rating | Enables high-energy transient clamping and sustained regulation in 12–48V industrial power supplies |
| ±5% VZ tolerance | Reduces need for post-assembly trimming in voltage reference circuits requiring <1% total error budget |
| Lead-free, halogen-free "Green" construction | Meets RoHS 3 (2015/863/EU) and JEDEC J-STD-020 moisture sensitivity Level 1 for reflow compatibility |
| Cathode band polarity marking | Ensures unambiguous orientation during automated optical inspection (AOI) and pick-and-place placement |
| UL 94V-0 flammability rating | Validates safe operation under fault conditions where sustained overvoltage may cause thermal runaway |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V digital input channels from load dump and inductive switching transients. IC Role / Device Role: Primary shunt clamp placed between input line and chassis ground. Use Value: Clamps surge voltages to ≤49.35V while dissipating up to 3.0W peak energy, preventing damage to downstream logic inputs. | Use Scenario: Stabilizing 48V auxiliary supply rail in 48V mild-hybrid vehicle subsystems. IC Role / Device Role: Precision voltage reference for ADC biasing and sensor excitation circuits. Use Value: Maintains 47V ±2.35V regulation across −40°C to +125°C, enabling <0.5% full-scale measurement accuracy. |
| Telecom Power Interface | Medical Diagnostic Equipment |
Use Scenario: Overvoltage protection on -48V DC distribution backplane in central office equipment. IC Role / Device Role: Secondary crowbar element triggered by upstream supervisor IC during brownout recovery. Use Value: Responds within 100ns to exceed 49.35V threshold, limiting fault energy to <100mJ before fuse activation. | Use Scenario: Isolated voltage reference for patient-connected analog front-end in portable ultrasound units. IC Role / Device Role: Low-noise, low-leakage zener source for precision gain-setting resistors. Use Value: Delivers <0.25µA reverse leakage at 35.8V, minimizing offset drift in microvolt-level signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5368B | Same 47V nominal VZ, but 5W power rating in DO-201AD package; RθJA = 30°C/W (higher thermal mass) | Requires larger PCB area and manual soldering; unsuitable for high-density SMT layouts | Select when higher pulse energy handling is required and board space permits through-hole mounting. |
| BZX84-C47 | 47V VZ in SOT-23; 300mW PD; ZZT = 90Ω at 5mA - lower impedance but lower power | Limited to low-current biasing and signal-level references; cannot sustain 67mA continuous current | Select for space-constrained signal conditioning where regulation current <5mA and thermal margin is adequate. |
Compared with 1N5368B and BZX84-C47, the 1SMB5941B-13 uniquely balances 3.0W SMT-compatible power handling, 1000Ω impedance at 67mA, and industry-standard SMB footprint-making it optimal for automated production of mid-power industrial regulators.
Availability
1SMB5941B-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power interface designs requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1SMB5941B-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.
The SMB-series Zener diodes are part of Diodes' high-reliability power protection portfolio, engineered specifically for stable voltage regulation and transient suppression in harsh-environment industrial and automotive applications.
FAQ
What is the maximum continuous zener current for 1SMB5941B-13 at +75°C?
At terminal temperature TL = +75°C, the device supports 3.0W power dissipation. With VZ = 47V, this corresponds to a maximum continuous zener current of approximately 63.8mA (IZ = PD/VZ). Derating must follow the 40mW/°C slope above +75°C per datasheet Note 5.
Does 1SMB5941B-13 require heatsinking for 550mW operation?
No external heatsink is required for 550mW operation at +25°C ambient, as the SMB package's RθJA = 226°C/W yields a junction-to-ambient rise of ~125°C - within the +150°C TJ limit. However, PCB copper area per AP02001 layout is mandatory to achieve this rating.
How does the 1SMB5941B-13 differ from the 1SMB5941BT3G?
The 1SMB5941B-13 uses tape-and-reel packaging (3000 units/reel) with matte tin lead finish and RoHS 3 compliance. The 1SMB5941BT3G is identical electrically and thermally but shipped in 10,000-unit reels and carries additional automotive qualification per AEC-Q101 - not applicable to the -13 variant.
Can 1SMB5941B-13 be used in place of a 47V TVS diode for ESD protection?
No - while it has >16kV HBM ESD rating, its 1000Ω dynamic impedance and 67mA test current make it unsuitable for fast transient suppression. TVS diodes (e.g., SMAJ47A) offer sub-nanosecond response and <1Ω clamping impedance; this Zener is intended for steady-state regulation, not surge clamping.
1SMB5941B-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
1SMB5941B-13 FAQ
1.How can I place an order for 1SMB5941B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5941B-13 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 1SMB5941B-13 reliable?
The price and inventory of 1SMB5941B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5941B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5941B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5941B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5941B-13?
1SMB5941B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5941B-13 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 1SMB5941B-13?
For technical support, including 1SMB5941B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5941B-13 requirements.
6.How does Aetrix verify that 1SMB5941B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5941B-13 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 1SMB5941B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5941B-13?
All 1SMB5941B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5941B-13, 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 1SMB5941B-13 part is unused and in its original packaging.
Return procedure for 1SMB5941B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5941B-13 Tags
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