INA381A4IDGST Equivalent & Substitute Parts

Part Overview

The INA381A4IDGST is a current sense regulator IC manufactured by Texas Instruments, designed for high/low-side current sensing applications. This zero-drift current sense device operates across an input voltage range of 0V to 26V with ±1% accuracy and is housed in a 10-VSSOP package. The part is currently in Last Time Buy status, indicating limited availability and the necessity to identify equivalent alternatives for ongoing production requirements.

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 INA381A4IDGST is determined by strict equivalence across the following critical parameters:

Base Product Number: All substitutes share the INA381 base designation
Function & Sensing Method: All parts perform high/low-side current sensing
Accuracy: All parts maintain ±1% accuracy specification
Input Voltage Range: All parts operate across 0V ~ 26V
Operating Temperature: All parts support -40°C ~ 125°C range
Package / Case: All parts use 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) with 10-VSSOP supplier package
Mounting Type: All parts are surface mount
Compliance: All parts are ROHS3 compliant with MSL 2 (1 Year)

Variations in part numbering (A1, A2, A3, A4 designations) and packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) do not affect electrical or mechanical compatibility. Automotive-grade variants (QDGSRQ1 suffix) include AEC-Q100 qualification and are suitable for automotive applications while maintaining full compatibility with industrial-grade variants.

Parameter Comparison

Part Number	Packaging	Series	Product Status	Inventory (Pcs)	Grade	Qualification
INA381A4IDGST	Tape & Reel (TR)	Zero-Drift	Last Time Buy	1055	Industrial	—
INA381A1IDGSR	Cut Tape (CT) & Digi-Reel®	Zero-Drift	Active	3200	Industrial	—
INA381A1IDGST	Tape & Reel (TR)	Zero-Drift	Last Time Buy	760	Industrial	—
INA381A1QDGSRQ1	Cut Tape (CT) & Digi-Reel®	—	Active	6000	Automotive	AEC-Q100
INA381A2IDGSR	Tape & Reel (TR)	Zero-Drift	Active	3543	Industrial	—
INA381A2IDGST	Tape & Reel (TR)	Zero-Drift	Active	2650	Industrial	—
INA381A2QDGSRQ1	Tape & Reel (TR)	—	Active	1300	Automotive	AEC-Q100
INA381A3IDGSR	Tape & Reel (TR)	Zero-Drift	Active	2689	Industrial	—
INA381A3IDGST	Tape & Reel (TR)	Zero-Drift	Last Time Buy	2065	Industrial	—
INA381A3QDGSRQ1	Cut Tape (CT) & Digi-Reel®	—	Active	2500	Automotive	AEC-Q100
INA381A4IDGSR	Cut Tape (CT) & Digi-Reel®	Zero-Drift	Active	3300	Industrial	—

Engineering Selection Recommendations

For applications currently using INA381A4IDGST in Tape & Reel packaging, the following selection criteria apply:

Active Status Priority: INA381A2IDGST, INA381A3IDGSR, and INA381A4IDGSR are recommended as primary alternatives due to active product status, ensuring long-term availability and supply chain stability.

Packaging Format Compatibility: INA381A4IDGSR provides identical electrical specifications with Cut Tape & Digi-Reel packaging and active status. INA381A2IDGST and INA381A3IDGSR maintain Tape & Reel format with active status.

Automotive Applications: For designs requiring automotive-grade components with AEC-Q100 qualification, INA381A1QDGSRQ1, INA381A2QDGSRQ1, and INA381A3QDGSRQ1 are electrically equivalent substitutes with automotive certification.

Inventory Availability: INA381A1QDGSRQ1 offers the highest inventory level (6000 pcs) among active parts, followed by INA381A4IDGSR (3300 pcs) and INA381A1IDGSR (3200 pcs).

Frequently Asked Questions (FAQ)

Q: Can INA381A4IDGSR replace INA381A4IDGST in production?

A: Yes. Both parts share identical electrical specifications, accuracy, voltage range, temperature range, and package dimensions. The difference is packaging format: INA381A4IDGSR uses Cut Tape & Digi-Reel while INA381A4IDGST uses Tape & Reel. Both are surface mount compatible with the same PCB footprint.

Q: Are automotive-grade variants (QDGSRQ1) electrically interchangeable with industrial-grade parts?

A: Yes. Automotive-grade variants such as INA381A1QDGSRQ1, INA381A2QDGSRQ1, and INA381A3QDGSRQ1 maintain identical electrical performance, accuracy, and operating parameters as their industrial-grade counterparts. The QDGSRQ1 designation indicates AEC-Q100 qualification and automotive-grade manufacturing processes, making them suitable for both automotive and industrial applications.

Q: What is the significance of the A1, A2, A3, A4 designations in the part number?

A: The A1 through A4 designations represent different product variants within the INA381 family. All variants share the same electrical specifications, accuracy, and functional performance. The designation does not indicate a performance hierarchy or functional difference relevant to substitution decisions.

Q: Does packaging format affect electrical performance or PCB compatibility?

A: No. Tape & Reel (TR) and Cut Tape & Digi-Reel (CT) packaging formats are supply chain and handling variations only. Both formats contain identical components with the same electrical characteristics, pin configuration, and PCB footprint. Selection between formats depends on assembly process requirements and inventory management practices.

Q: Are parts in Last Time Buy status still suitable for new designs?

A: Parts designated Last Time Buy (INA381A4IDGST, INA381A1IDGST, INA381A3IDGST) have limited remaining inventory and will not be replenished. For new designs or long-term production, selection of Active status parts (INA381A2IDGST, INA381A3IDGSR, INA381A4IDGSR, or automotive-grade variants) is required to ensure supply continuity.

Q: What compliance certifications apply to all substitute parts?

A: All listed parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Moisture sensitivity level is MSL 2 (1 Year) across all variants. Automotive-grade parts (QDGSRQ1 suffix) additionally carry AEC-Q100 qualification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message