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INA381A1IDGST Equivalent & Substitute Parts
Part Overview
The INA381A1IDGST is a current sense regulator IC from Texas Instruments, designed for high/low-side current sensing applications. This zero-drift series component operates across 0V to 26V input range with ±1% accuracy and is housed in a 10-VSSOP package. The main part carries Last Time Buy status, indicating end-of-life production. Identifying parametric equivalents and substitutes is necessary to ensure design continuity and maintain supply chain flexibility for applications requiring current sensing functionality.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Base Product Number | INA381 |
| Function | Current Sense |
| Sensing Method | High/Low-Side |
| Accuracy | ±1% |
| Voltage - Input Range | 0V ~ 26V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Package / Case | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) |
| Supplier Device Package | 10-VSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
Substitute Part Grouping Explanation
Substitution of the INA381A1IDGST is determined by strict adherence to the following parameters:
- Functional Equivalence: All substitute parts maintain identical current sense function and high/low-side sensing method
- Electrical Specifications: Input voltage range (0V ~ 26V), accuracy (±1%), and operating temperature range (-40°C ~ 125°C) are identical across all substitutes
- Package Compatibility: All substitutes use the 10-VSSOP package with identical mechanical dimensions (10-TFSOP, 10-MSOP, 0.118" width, 3.00mm)
- Compliance Standards: All parts maintain ROHS3 compliance and MSL 2 rating
- Manufacturer Consistency: All substitutes are from Texas Instruments, INA381 base product family
Substitutes are grouped into two categories based on product status and packaging format: Active status parts with standard or automotive-grade qualifications, and Last Time Buy parts with equivalent electrical performance.
Parameter Comparison
| Part Number | Manufacturer | Packaging | Product Status | Series | Grade | Qualification | Inventory (Pcs) | Accuracy | Voltage Input | Temp Range | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|
| INA381A1IDGST | Texas Instruments | Tape & Reel (TR) | Last Time Buy | Zero-Drift | - | - | 760 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A1IDGSR | Texas Instruments | Cut Tape (CT) & Digi-Reel® | Active | Zero-Drift | - | - | 3200 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A1QDGSRQ1 | Texas Instruments | Cut Tape (CT) & Digi-Reel® | Active | - | Automotive | AEC-Q100 | 6000 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A2IDGSR | Texas Instruments | Tape & Reel (TR) | Active | Zero-Drift | - | - | 3543 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A2IDGST | Texas Instruments | Tape & Reel (TR) | Active | Zero-Drift | - | - | 2650 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A2QDGSRQ1 | Texas Instruments | Tape & Reel (TR) | Active | - | Automotive | AEC-Q100 | 1300 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A3IDGSR | Texas Instruments | Tape & Reel (TR) | Active | Zero-Drift | - | - | 2689 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A3IDGST | Texas Instruments | Tape & Reel (TR) | Last Time Buy | Zero-Drift | - | - | 2065 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A3QDGSRQ1 | Texas Instruments | Cut Tape (CT) & Digi-Reel® | Active | - | Automotive | AEC-Q100 | 2500 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A4IDGSR | Texas Instruments | Cut Tape (CT) & Digi-Reel® | Active | Zero-Drift | - | - | 3300 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
| INA381A4IDGST | Texas Instruments | Tape & Reel (TR) | Last Time Buy | Zero-Drift | - | - | 1055 | ±1% | 0V ~ 26V | -40°C ~ 125°C | 10-VSSOP |
Engineering Selection Recommendations
For applications currently using INA381A1IDGST, the following selection criteria apply:
Active Status Substitutes (Preferred for New Designs)
INA381A1IDGSR, INA381A2IDGSR, INA381A2IDGST, INA381A3IDGSR, and INA381A4IDGSR are all Active status parts with full production support. These parts maintain identical electrical specifications and package compatibility. INA381A1IDGSR offers the highest inventory (3200 pcs) with matching Zero-Drift series designation and standard packaging format.
Automotive-Grade Alternatives
INA381A1QDGSRQ1, INA381A2QDGSRQ1, and INA381A3QDGSRQ1 carry AEC-Q100 automotive qualification and are suitable for applications requiring automotive-grade components. These parts are Active status with robust inventory levels (1300–6000 pcs).
Last Time Buy Alternatives
INA381A3IDGST and INA381A4IDGST maintain Last Time Buy status identical to the main part. These are suitable only for existing production runs with defined end dates and should not be selected for new designs.
Packaging Considerations
Tape & Reel (TR) packaging is available in INA381A1IDGSR, INA381A2IDGSR, INA381A2IDGST, INA381A3IDGSR, INA381A3IDGST, and INA381A4IDGST. Cut Tape (CT) & Digi-Reel® packaging is available in INA381A1QDGSRQ1, INA381A3QDGSRQ1, and INA381A4IDGSR. Selection depends on procurement and assembly requirements.
Frequently Asked Questions (FAQ)
Q: Can INA381A1IDGSR directly replace INA381A1IDGST?
A: Yes. Both parts share identical electrical specifications (±1% accuracy, 0V–26V input, -40°C–125°C operating range), package type (10-VSSOP), and functional characteristics. The difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and product status (Active versus Last Time Buy). INA381A1IDGSR is the recommended substitute for ongoing production.
Q: What is the difference between Zero-Drift series and non-designated parts?
A: The Zero-Drift designation appears in the Series field for certain part variants. All substitutes maintain identical electrical performance regardless of series designation. The series field does not affect functional equivalence or substitutability.
Q: Are automotive-grade variants (QDGSRQ1) suitable for non-automotive applications?
A: Yes. Automotive-grade parts with AEC-Q100 qualification exceed standard requirements and are fully compatible with non-automotive applications. They may be selected when higher reliability margins are desired.
Q: Does packaging format affect electrical performance?
A: No. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging formats contain identical components with identical electrical specifications. Selection is based on procurement, storage, and assembly process requirements only.
Q: Should Last Time Buy parts be used for new designs?
A: No. Last Time Buy status indicates end-of-life production. INA381A3IDGST and INA381A4IDGST should be reserved for existing production runs only. Active status alternatives (INA381A1IDGSR, INA381A2IDGSR, INA381A2IDGST, INA381A3IDGSR, INA381A4IDGSR) are recommended for new designs.
Q: What inventory levels should influence part selection?
A: Inventory availability is provided for reference. INA381A1QDGSRQ1 offers the highest inventory (6000 pcs), followed by INA381A1IDGSR (3200 pcs) and INA381A4IDGSR (3300 pcs). Selection should prioritize Active status parts with sufficient inventory for production requirements.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitutes maintain ROHS3 compliance and MSL 2 (1 Year) rating, matching the main part specifications.
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