INA381A3IDGST Equivalent & Substitute Parts

Part Overview

The INA381A3IDGST is a current sense regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This high/low-side current sense device 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 with 2065 units in stock. Substitute parts are necessary when the primary part reaches end-of-life, when alternative packaging formats are required for manufacturing flexibility, or when automotive-grade qualification is mandated for specific applications.

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 INA381A3IDGST is determined by strict equivalence across the following parameters:

Core Electrical Parameters (Non-Negotiable):

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

Mechanical & Compliance Parameters:

Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 2 (1 Year)

Substitution Variants: All substitute parts share identical electrical and mechanical specifications. Differences exist only in:

Packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®)
Product status (Active vs. Last Time Buy)
Series designation (Zero-Drift vs. unspecified)
Automotive qualification (AEC-Q100 for automotive-grade variants)

Parameter Comparison

Part Number	Manufacturer	Packaging	Product Status	Series	Grade	Qualification	Inventory (Pcs)	Accuracy	Voltage Input	Temp Range
INA381A3IDGST	Texas Instruments	Tape & Reel (TR)	Last Time Buy	Zero-Drift	-	-	2065	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A1IDGSR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	Active	Zero-Drift	-	-	3200	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A1IDGST	Texas Instruments	Tape & Reel (TR)	Last Time Buy	Zero-Drift	-	-	760	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A1QDGSRQ1	Texas Instruments	Cut Tape (CT) & Digi-Reel®	Active	-	Automotive	AEC-Q100	6000	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A2IDGSR	Texas Instruments	Tape & Reel (TR)	Active	Zero-Drift	-	-	3543	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A2IDGST	Texas Instruments	Tape & Reel (TR)	Active	Zero-Drift	-	-	2650	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A2QDGSRQ1	Texas Instruments	Tape & Reel (TR)	Active	-	Automotive	AEC-Q100	1300	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A3IDGSR	Texas Instruments	Tape & Reel (TR)	Active	Zero-Drift	-	-	2689	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A3QDGSRQ1	Texas Instruments	Cut Tape (CT) & Digi-Reel®	Active	-	Automotive	AEC-Q100	2500	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A4IDGSR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	Active	Zero-Drift	-	-	3300	±1%	0V ~ 26V	-40°C ~ 125°C
INA381A4IDGST	Texas Instruments	Tape & Reel (TR)	Last Time Buy	Zero-Drift	-	-	1055	±1%	0V ~ 26V	-40°C ~ 125°C

Engineering Selection Recommendations

For Standard Industrial Applications: Select from Active-status parts with Zero-Drift series designation: INA381A2IDGSR, INA381A2IDGST, INA381A3IDGSR, INA381A4IDGSR. These parts offer long-term availability and stable supply chains. Tape & Reel packaging (IDGST, IDGSR) is preferred for high-volume production; Cut Tape & Digi-Reel® variants (IDGSR with CT designation) provide flexibility for lower-volume or prototype applications.

For Automotive Applications: Use AEC-Q100 qualified parts: INA381A1QDGSRQ1, INA381A2QDGSRQ1, or INA381A3QDGSRQ1. These variants meet automotive-grade requirements and carry Active product status with robust inventory levels (1300–6000 units).

For End-of-Life Mitigation: The main part INA381A3IDGST carries Last Time Buy status. Transition to INA381A3IDGSR (Active, Tape & Reel) or INA381A2IDGST (Active, Tape & Reel) to ensure long-term supply continuity. Both maintain identical electrical specifications and Zero-Drift series characteristics.

Packaging Considerations: Tape & Reel (TR) packaging is standard for automated assembly lines. Cut Tape (CT) & Digi-Reel® packaging accommodates smaller order quantities and manual assembly workflows without electrical or mechanical performance changes.

Frequently Asked Questions (FAQ)

Q: Can I substitute INA381A3IDGST with any other INA381 variant? A: All listed substitute parts share identical electrical specifications (±1% accuracy, 0V–26V input, -40°C–125°C operation, High/Low-Side sensing) and mechanical compatibility (10-VSSOP package, Surface Mount). Substitution is electrically valid across all variants. Selection depends on packaging format, product status, and automotive qualification requirements.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging? A: Tape & Reel (TR) packaging is continuous reel format optimized for high-speed automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® provides pre-cut tape segments suitable for lower-volume production, prototype builds, or manual assembly. Both formats contain identical components with no electrical or performance differences.

Q: Why do some parts have "QDGSRQ1" designation and others have "IDGST" or "IDGSR"? A: The suffix indicates packaging format and qualification level. "IDGST" and "IDGSR" are standard industrial-grade variants. "QDGSRQ1" denotes automotive-grade parts with AEC-Q100 qualification, required for automotive applications. All variants maintain identical core electrical performance.

Q: Is INA381A3IDGST still available for new designs? A: INA381A3IDGST carries Last Time Buy status with 2065 units in stock. For new designs requiring long-term supply assurance, select Active-status alternatives such as INA381A2IDGST, INA381A3IDGSR, or INA381A2IDGSR.

Q: Can I use automotive-grade parts (QDGSRQ1) in non-automotive applications? A: Yes. Automotive-grade parts exceed standard industrial requirements and are fully compatible with non-automotive applications. AEC-Q100 qualification provides additional reliability assurance and is not detrimental to standard industrial use.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed parts maintain ROHS3 compliance and Moisture Sensitivity Level 2 (1 Year), meeting environmental and handling requirements across all applications.

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