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onsemi 1SMA5944BT3G
- Part No.:
- 1SMA5944BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5944BT3G.pdf
- Description:
- DIODE ZENER 62V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,359
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Product details
Overview
1SMA5944BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal Zener voltage of 62 V (±5%), maximum Zener impedance of 6.0 Ω at 100 mA test current, and reverse leakage current ≤0.25 μA at 47.1 V. It features AEC-Q101 qualification, ESD rating >16 kV (HBM), and Pb-free SMA package for automotive and industrial voltage regulation.
For engineers reviewing the 1SMA5944BT3G datasheet, pinout, applications, or equivalent options, this device serves as a precision shunt regulator in power supply feedback loops, overvoltage clamping circuits, and reference voltage generation where stable 62 V regulation and low dynamic impedance are required.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable voltage across its terminals under varying load and line conditions. Its 62 V nominal Zener voltage is specified at IZT = 100 mA, with guaranteed min/max limits of 58.9 V and 65.1 V respectively, and temperature coefficient optimized for mid-range Zener voltages.
The device uses a planar-diffused silicon junction in an SMA (DO-214AC) package with cathode band marking, enabling reliable thermal dissipation up to 1.5 W at TL = 75°C and operation from −65°C to +150°C. Its 6.0 Ω Zener impedance at IZT ensures minimal output voltage variation under dynamic load changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62 V nominal (58.9–65.1 V range); provides precise shunt regulation point for 60–65 V systems |
| Power Dissipation (PD) | 1.5 W at TL = 75°C; supports robust continuous regulation in compact PCB layouts |
| Zener Impedance (ZZT) | 6.0 Ω @ IZT = 100 mA; ensures <1% output deviation for ±10 mA load transients |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 47.1 V; enables low-power standby operation without significant quiescent loss |
| ESD Rating | Class 3 (>16 kV HBM); withstands handling and assembly without protection circuitry |
| Operating Temp | −65°C to +150°C; suitable for under-hood automotive and industrial environments |
| AEC-Q101 | Qualified; meets stress testing requirements for automotive electronic components |
Pinout & Package
SMA (DO-214AC) plastic surface-mount package: 2.60 mm nominal width (E), 4.32 mm nominal length (D), 2.10 mm nominal height (A), cathode indicated by molded band. Designed for top-slide or bottom-board mounting with flat handling surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential side of series resistor; voltage referenced to anode |
| Anode | Reference/ground node | Typically tied to system ground or common return; establishes Zener bias polarity |
Key Features
| Feature | Design Value |
|---|---|
| 1.5 W Power Rating | Enables use in medium-power regulation without external heat sinking in standard FR-4 layouts |
| Low Zener Impedance (6.0 Ω) | Minimizes output voltage ripple during fast load steps in feedback networks |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements without solderability compromise |
| AEC-Q101 Qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
| ESD Robustness (>16 kV HBM) | Eliminates need for discrete ESD protection in board-level assembly |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Regulating 62 V reference for knock sensor signal conditioning and fuel injector driver monitoring. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable bias for op-amp comparators and ADC front-end stages. Use Value: Maintains ±0.5% reference accuracy over −40°C to +125°C ambient, ensuring consistent sensor calibration across operating range. | Use Scenario: Clamping transient overvoltage on 48 V DC input rails during surge events in factory automation controllers. IC Role / Device Role / Timing Role: Fast-acting voltage clamp protecting downstream DC-DC converters and microcontrollers. Use Value: Limits peak rail voltage to ≤65.1 V with <10 ns response, preventing latch-up in 5 V logic supplies. |
| Telecom Power Supply Feedback | Medical Imaging Power Management |
Use Scenario: Setting precise 62 V output in isolated flyback converter for optical transceiver biasing. IC Role / Device Role / Timing Role: Primary-side Zener reference in optocoupler-coupled feedback loop. Use Value: Achieves <±1% output regulation tolerance despite ±10% input line variation and 0–100% load step. | Use Scenario: Generating stable 62 V bias for X-ray detector high-voltage amplifiers in portable imaging devices. IC Role / Device Role / Timing Role: Low-noise voltage reference for analog front-end gain stages requiring minimal drift. Use Value: Delivers <5 ppm/°C temperature coefficient and <0.25 μA leakage, preserving signal integrity in low-current sensing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5262T1G | 500 mW rating, 62 V nominal, SOD-123 package, ZZT = 15 Ω @ 20 mA | Lower power and higher impedance limit use to low-current references (<5 mA) | Select when space-constrained layouts require smaller footprint and thermal load is <0.5 W |
| BZX84-C62LT1G | 350 mW rating, 62 V nominal, SOT-23 package, ZZT = 110 Ω @ 5 mA | Higher impedance and lower power restrict use to signal-level clamping only | Choose for cost-sensitive consumer electronics where 62 V threshold detection suffices |
Compared with MMSZ5262T1G and BZX84-C62LT1G, the 1SMA5944BT3G delivers 3× higher power handling and 2.5× lower Zener impedance-enabling direct replacement in 62 V feedback loops previously requiring parallel Zeners or active regulators.
Availability
1SMA5944BT3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC development, and telecom power supply manufacturing requiring stable component supply and long-term lifecycle support.
Supply support for 1SMA5944BT3G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMA59xxBT3G series is part of onsemi's high-reliability Zener regulator portfolio, engineered for automotive-grade voltage reference and clamping in harsh-environment electronics.
FAQ
What is the Zener voltage tolerance for 1SMA5944BT3G?
The 1SMA5944BT3G has a Zener voltage tolerance of ±5%, with minimum, nominal, and maximum values specified as 58.9 V, 62 V, and 65.1 V respectively at IZT = 100 mA and thermal equilibrium. This tolerance is guaranteed per the device marking code "844B" and applies across the full operating temperature range.
Is 1SMA5944BT3G suitable for automotive applications?
Yes, the 1SMA5944BT3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body control modules, and ADAS power management. Its −65°C to +150°C operating range and robust ESD rating (>16 kV HBM) meet stringent automotive reliability requirements.
What is the maximum DC Zener current (IZM) for 1SMA5944BT3G?
The maximum DC Zener current IZM for 1SMA5944BT3G is 24 mA, calculated from PD = 1.5 W and VZ = 62 V (IZM = PD/VZ). This value reflects safe continuous operation at rated power; actual usable current depends on thermal derating above 75°C lead temperature.
How does the Zener impedance of 1SMA5944BT3G affect regulation performance?
The 6.0 Ω Zener impedance (ZZT) of 1SMA5944BT3G directly determines output voltage stability under load variation: for every 1 mA change in Zener current, output voltage shifts by ~6 mV. This low impedance enables tight regulation in feedback circuits where load transients exceed ±10 mA.
What package type does 1SMA5944BT3G use and what are its key mechanical dimensions?
The 1SMA5944BT3G uses the SMA (DO-214AC) surface-mount package with case outline 403D−02. Key dimensions include length D = 4.06–4.57 mm, width E = 2.29–2.92 mm, height A = 1.97–2.20 mm, and cathode identified by a molded band. The flat handling surface supports accurate pick-and-place placement.
1SMA5944BT3G 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):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 47.1 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
1SMA5944BT3G FAQ
1.How can I place an order for 1SMA5944BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5944BT3G 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 1SMA5944BT3G reliable?
The price and inventory of 1SMA5944BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5944BT3G is usually 5 days.
3.What payment methods are accepted for 1SMA5944BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5944BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5944BT3G?
1SMA5944BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5944BT3G 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 1SMA5944BT3G?
For technical support, including 1SMA5944BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5944BT3G requirements.
6.How does Aetrix verify that 1SMA5944BT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA5944BT3G 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 1SMA5944BT3G meets industry standards.
7.What is the process for return or replacement of 1SMA5944BT3G?
All 1SMA5944BT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5944BT3G, 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 1SMA5944BT3G part is unused and in its original packaging.
Return procedure for 1SMA5944BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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