LT1009IDRG4 Equivalent & Substitute Parts

Part Overview

The LT1009IDRG4 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±0.4% tolerance. This component functions as a precision voltage reference in power management applications. The LT1009IDRG4 carries an obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	10 mA
Tolerance	±0.4%
Temperature Coefficient	35ppm/°C
Current - Cathode	400 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LT1009IDRG4 is determined by strict equivalence across the following critical parameters:

Reference Type: Shunt
Output Voltage: 2.5V fixed
Output Current: 10 mA
Tolerance: ±0.4%
Temperature Coefficient: 35ppm/°C
Operating Temperature Range: -40°C ~ 85°C
Package: 8-SOIC surface mount
Cathode Current: 400 µA

Substitute parts must maintain identical electrical specifications and package compatibility. Variations in temperature coefficient or operating temperature range indicate different performance grades and are not interchangeable with the LT1009IDRG4.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Tolerance	Temp Coefficient	Operating Temp	Package	Packaging Type
LT1009IDRG4	Texas Instruments	Obsolete	2.5V	±0.4%	35ppm/°C	-40°C ~ 85°C	8-SOIC	Digi-Reel
LT1009IDR	Texas Instruments	Active	2.5V	±0.4%	35ppm/°C	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel
LT1009IS8#TRPBF	Analog Devices Inc.	Active	2.5V	±0.4%	35ppm/°C	-40°C ~ 85°C	8-SOIC	Tape & Reel
LT1009IS8#PBF	Analog Devices Inc.	Active	2.5V	±0.4%	35ppm/°C	-40°C ~ 85°C	8-SOIC	Tube
LT1009S8#TRPBF	Analog Devices Inc.	Active	2.5V	±0.4%	25ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel
LT1009S8#PBF	Analog Devices Inc.	Active	2.5V	±0.4%	25ppm/°C	0°C ~ 70°C	8-SOIC	Tube

Engineering Selection Recommendations

For direct replacement of the obsolete LT1009IDRG4, select LT1009IDR. This part maintains identical electrical specifications and operating temperature range while offering active product status and improved availability.

For applications requiring Analog Devices sourcing, LT1009IS8#TRPBF and LT1009IS8#PBF provide full parametric equivalence with active status. Selection between tape & reel and tube packaging depends on procurement volume and assembly requirements.

LT1009S8#TRPBF and LT1009S8#PBF are not direct substitutes for the LT1009IDRG4. These parts feature a reduced temperature coefficient (25ppm/°C versus 35ppm/°C) and narrower operating temperature range (0°C ~ 70°C versus -40°C ~ 85°C). Use these variants only when application requirements permit the narrower temperature specification.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and identical package geometry, ensuring mechanical and electrical compatibility in existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can LT1009S8#TRPBF replace LT1009IDRG4 in my design?

A: No. LT1009S8#TRPBF operates over 0°C ~ 70°C and exhibits 25ppm/°C temperature coefficient, whereas LT1009IDRG4 operates over -40°C ~ 85°C with 35ppm/°C coefficient. Use LT1009S8#TRPBF only if your application temperature range does not exceed 0°C ~ 70°C.

Q: What is the primary difference between LT1009IDR and LT1009IS8#TRPBF?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is manufacturer: LT1009IDR is Texas Instruments; LT1009IS8#TRPBF is Analog Devices Inc. Packaging differs (Cut Tape & Digi-Reel versus Tape & Reel). Select based on supplier availability and procurement preference.

Q: Does packaging type affect electrical performance?

A: No. Packaging type (Tube, Tape & Reel, Cut Tape, Digi-Reel) affects only procurement and assembly handling. All variants with identical part number prefixes deliver the same electrical performance.

Q: Is LT1009IDRG4 still available for purchase?

A: LT1009IDRG4 carries obsolete status. Procurement should transition to active equivalents: LT1009IDR (Texas Instruments) or LT1009IS8#TRPBF / LT1009IS8#PBF (Analog Devices Inc.).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the compliance profile of LT1009IDRG4.

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