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Diodes Incorporated 1SMB5944B-13
- Part No.:
- 1SMB5944B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5944B-13.pdf
- Description:
- DIODE ZENER 62V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:905
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Product details
Overview
1SMB5944B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with a nominal zener voltage of 62V (±5%), 1500Ω dynamic impedance at 6mA test current, and 24mA maximum reverse leakage at 47.1V. It features ESD rating >16kV (HBM), RoHS-compliant lead-free finish, and SMB package for automated assembly in voltage regulation and overvoltage protection circuits.
For engineers reviewing the 1SMB5944B-13 datasheet, 1SMB5944B-13 pinout, 1SMB5944B-13 application, or 1SMB5944B-13 equivalent, key selection criteria include zener voltage tolerance, power derating above +25°C, thermal resistance (RθJA = 226°C/W), and compliance with IPC/JEDEC J-STD-020 moisture sensitivity level 1.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and line conditions. Its 62V nominal zener voltage is specified at 6mA test current (IZT), with 1500Ω dynamic impedance (ZZT) and 0.25µA maximum reverse current (IR) at 47.1V (VR = 0.75 × VZ).
Thermal performance is defined for FR-4 PCB mounting per AP02001 pad layout: 3.0W power dissipation at TL = +75°C, derating at 40mW/°C above that temperature; junction-to-ambient thermal resistance is 226°C/W at TA = +25°C, derating at 4.4mW/°C above ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62V nominal (58.9–65.1V range at IZT = 6mA); defines precise clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 3.0W at TL = +75°C; supports sustained energy absorption in transient suppression applications |
| Zener Impedance (ZZT) | 1500Ω at IZT = 6mA; indicates voltage regulation stability under small-signal AC variations |
| Reverse Leakage (IR) | 0.25µA max at VR = 47.1V; ensures minimal standby current in high-impedance bias networks |
| ESD Rating | Class 3 (>16kV HBM); enables robust handling in automated SMT lines without additional ESD mitigation |
| Thermal Resistance | RθJA = 226°C/W; determines required PCB copper area for thermal management at target ambient temperature |
| Moisture Sensitivity | Level 1 per J-STD-020; allows unlimited floor life without dry pack or baking prior to reflow |
Pinout & Package
Package: SMB (Surface Mount Body), molded plastic case rated UL 94V-0, cathode band polarity marking, 0.096g weight. Dimensions: 3.30–3.94mm (A) × 4.06–4.57mm (B) × 1.96–2.21mm (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in shunt regulator | Connected to circuit ground or lower potential node; carries forward current up to 200mA (VF = 1.5V) |
| Cathode | Zener breakdown terminal / high-side connection in shunt regulator | Connected to protected node or voltage rail; sustains reverse breakdown at 62V with controlled dynamic impedance |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling | Enables single-device transient voltage suppression in 24–48V industrial control rails without parallel devices |
| ±5% Zener Tolerance | Reduces need for post-assembly calibration in precision reference designs requiring tight voltage margins |
| Lead-Free & Halogen-Free | Meets RoHS 3 (2015/863/EU) and green manufacturing requirements for export to EU, China, and Korea |
| ESD Class 3 Robustness | Eliminates ESD handling controls during pick-and-place, reducing line downtime and defect rates |
| SMB Package Compatibility | Matches standard SMT reflow profiles and vision-based AOI inspection templates for high-yield production |
Applications
| Industrial Power Supply Protection | Automotive ECUs |
|---|---|
Use Scenario: Clamping surge transients on 48V auxiliary power rails in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt voltage regulator providing overvoltage protection for downstream DC-DC converters and microcontrollers. Use Value: Absorbs 3.0W peak pulse power without degradation, maintaining rail integrity during ISO 7637-2 Pulse 1/2a events. | Use Scenario: Voltage reference stabilization in engine control unit (ECU) sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Precision zener reference source for analog-to-digital converter (ADC) biasing and sensor excitation. Use Value: ±5% VZ tolerance and <0.25µA IR ensure ADC reference accuracy remains within 0.1% full-scale error across -40°C to +125°C. |
| Telecom Line Card Protection | Medical Diagnostic Equipment |
Use Scenario: Overvoltage protection on -48V telecom backplane interfaces exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt clamp limiting voltage excursion to ≤65.1V during fast-rising transients. Use Value: 1500Ω ZZT minimizes voltage overshoot during 10/1000µs surges, preserving interface IC integrity. | Use Scenario: Isolated power rail monitoring in portable ultrasound imaging systems with battery-backed operation. IC Role / Device Role / Timing Role: Low-leakage zener element in high-impedance voltage divider for battery voltage telemetry. Use Value: 0.25µA IR at 47.1V prevents measurable discharge of Li-ion cells during multi-week standby intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5944B | Dual-in-line through-hole package (DO-41), same 62V/3W specs but higher RθJA (300°C/W) | Requires manual insertion or wave soldering; unsuitable for high-density SMT boards | Select when legacy through-hole assembly or prototyping on breadboard/perfboard is required |
| SMBJ64A | TVS diode (64V standoff, 100W peak pulse), not a regulated Zener; higher capacitance (150pF) | Designed for ESD/surge clamping, not precision voltage reference or biasing | Select only for transient suppression where DC regulation is not needed |
Compared with 1SMB5944B-13, 1N5944B trades SMT compatibility for easier hand-soldering and lower cost in low-volume builds, while SMBJ64A offers superior surge handling but lacks the stable DC zener characteristic required for reference applications.
Availability
1SMB5944B-13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive ECU voltage reference, and telecom line card protection requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for 1SMB5944B-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 Taiwan and China.
This device belongs to the SMB-series 3.0W Zener diode family, engineered for high-reliability voltage regulation and transient suppression in space-constrained, high-volume SMT applications across industrial, automotive, and communications markets.
FAQ
What is the maximum continuous power dissipation for 1SMB5944B-13 at +75°C?
The maximum continuous power dissipation is 3.0W at terminal temperature (TL) = +75°C. Above this temperature, power must be linearly derated at 40mW/°C. This value assumes mounting on an FR-4 PCB using Diodes Inc.'s recommended AP02001 pad layout, which defines thermal path efficiency.
Does 1SMB5944B-13 meet RoHS 3 and halogen-free requirements?
Yes - it complies with EU Directive 2015/863/EU (RoHS 3), contains <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony, and carries Diodes Incorporated's official "Green" designation per their quality documentation.
How is the zener voltage tolerance verified for 1SMB5944B-13?
Zener voltage is tested at IZT = 6mA with pulse duration short enough to minimize self-heating; units are binned to 58.9–65.1V (±5% of 62V nominal) and marked with code B944. Statistical process control ensures 100% testing of VZ during final QA screening.
Can 1SMB5944B-13 replace 1N5944B in existing designs?
No direct drop-in replacement: 1SMB5944B-13 uses SMB surface-mount packaging (3.6mm × 4.3mm), while 1N5944B uses DO-41 through-hole (5.2mm × 2.7mm). PCB layout, thermal relief, and assembly process must be redesigned; electrical parameters match, but mechanical fit and thermal performance differ significantly.
1SMB5944B-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):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 47.1 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
1SMB5944B-13 FAQ
1.How can I place an order for 1SMB5944B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5944B-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 1SMB5944B-13 reliable?
The price and inventory of 1SMB5944B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5944B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5944B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5944B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5944B-13?
1SMB5944B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5944B-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 1SMB5944B-13?
For technical support, including 1SMB5944B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5944B-13 requirements.
6.How does Aetrix verify that 1SMB5944B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5944B-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 1SMB5944B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5944B-13?
All 1SMB5944B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5944B-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 1SMB5944B-13 part is unused and in its original packaging.
Return procedure for 1SMB5944B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5944B-13 Tags
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