TL070IDRG4 Equivalent & Substitute Parts

Part Overview

The TL070IDRG4 is a J-FET input operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement. The TL070IDRG4 delivers a slew rate of 13V/µs with a gain bandwidth product of 5.25 MHz, making it suitable for precision analog signal processing applications requiring low input bias current and low input offset voltage characteristics.

Substiute Parts

TL070IDRG4

Texas InstrumentsIn Stock: 983TL070IDRG4 Datasheet

Current PartRFQ

TL081CDT

STMicroelectronicsIn Stock: 3681TL081CDT Datasheet

MFR RecommendedRFQ

TL081IDT

STMicroelectronicsIn Stock: 2003TL081IDT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL070IDRG4 is determined by strict equivalence in the following critical parameters:

Mandatory Equivalence Criteria:

• Amplifier Type: J-FET input configuration
• Number of Circuits: Single circuit per package
• Package / Case: 8-SOIC form factor with identical 0.154" (3.90mm) width
• Mounting Type: Surface mount technology
• Supply Voltage Range: Minimum 6V to 7V; Maximum 36V overlap
• Input Offset Voltage: 3 mV specification
• Supply Current: 1.4 mA nominal
• RoHS3 Compliance and MSL Level 1 rating

Performance Parameters Allowing Variation:

• Slew Rate: Substitute parts may exceed the 13V/µs specification
• Gain Bandwidth Product: Substitute parts may differ from 5.25 MHz
• Input Bias Current: Substitute parts may have lower values than 65 pA
• Operating Temperature Range: Substitute parts may extend beyond -40°C to 85°C
• Output Current per Channel: Additional specification in substitutes

The TL081CDT and TL081IDT meet all mandatory equivalence criteria while offering enhanced performance characteristics in slew rate and input bias current specifications.

Parameter Comparison

Engineering Selection Recommendations

TL081CDT Selection Criteria: The TL081CDT is suitable for applications where cut tape packaging format is required for automated assembly processes. This part maintains active product status with STMicroelectronics, ensuring long-term availability and supply chain stability. The operating temperature range of 0°C to 70°C is appropriate for commercial and industrial environments. RoHS3 compliance and MSL Level 1 rating confirm environmental and moisture handling compatibility with the original TL070IDRG4.

TL081IDT Selection Criteria: The TL081IDT is the preferred substitute when tape and reel packaging is specified for high-volume production environments. This variant extends the operating temperature range to -40°C to 105°C, providing superior thermal coverage compared to both the original part and the TL081CDT alternative. Active product status ensures procurement reliability. RoHS3 compliance and MSL Level 1 rating maintain regulatory and handling equivalence.

Compliance and Certification Alignment: Both substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring direct compatibility with existing assembly and storage protocols. REACH unaffected status and EAR99 ECCN classification remain consistent across all three parts, eliminating regulatory substitution barriers.

Frequently Asked Questions (FAQ)

Q: Can the TL081CDT or TL081IDT be used as direct pin-for-pin replacements for the TL070IDRG4?

A: Yes. Both substitute parts share identical 8-SOIC package geometry (0.154" width, 3.90mm) and pinout configuration, enabling direct PCB-level substitution without layout modifications.

Q: What is the difference between TL081CDT and TL081IDT packaging?

A: TL081CDT is supplied in cut tape format suitable for manual or semi-automated assembly. TL081IDT is supplied in tape and reel format optimized for high-speed automated pick-and-place assembly. Both contain identical die and electrical specifications.

Q: Are there operating temperature limitations when substituting the TL070IDRG4?

A: The TL081CDT operates from 0°C to 70°C, which is narrower than the original TL070IDRG4 range of -40°C to 85°C. The TL081IDT extends to -40°C to 105°C, exceeding the original specification. Application temperature requirements must be verified against the selected substitute.

Q: How do the electrical performance characteristics compare?

A: The TL081 series (both CDT and IDT variants) provides improved slew rate (16V/µs versus 13V/µs) and significantly lower input bias current (20 pA versus 65 pA). Gain bandwidth product is lower at 4 MHz versus 5.25 MHz. These differences are within acceptable substitution parameters for J-FET amplifier applications.

Q: Is the lower gain bandwidth product of the TL081 series a concern?

A: The 4 MHz gain bandwidth product of the TL081 series is lower than the TL070IDRG4 specification of 5.25 MHz. Application-specific frequency response requirements must be evaluated. For most general-purpose analog signal processing applications, this difference is not limiting.

Q: What is the significance of the 40 mA output current specification in the TL081 series?

A: The TL081CDT and TL081IDT specify 40 mA output current per channel, providing defined output drive capability. The original TL070IDRG4 does not specify this parameter. This additional specification in the substitutes indicates enhanced output drive capability suitable for driving lower impedance loads.

Q: Are there supply voltage compatibility concerns?

A: The TL081 series minimum supply voltage is 6V, compared to 7V for the TL070IDRG4. Both maintain 36V maximum. Applications operating at 6V to 7V supply levels are compatible with the TL081 substitutes. Applications requiring exactly 7V minimum operation should verify TL081 performance at the lower 6V threshold.

Q: Do RoHS and REACH compliance requirements affect substitution?

A: All three parts maintain ROHS3 compliance and REACH unaffected status. No regulatory barriers exist for substitution. Existing supply chain and assembly protocols remain valid.