THS3112IDRG4 Equivalent & Substitute Parts

Part Overview

The THS3112IDRG4 is a current feedback amplifier integrated circuit manufactured by Texas Instruments, configured as a dual-channel operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, indicating that Texas Instruments has discontinued production and support. The high slew rate of 1550V/µs and -3dB bandwidth of 110 MHz position this component for high-speed signal processing applications. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for design continuity, supply chain management, and new production requirements.

Substiute Parts

THS3112IDRG4

Texas InstrumentsIn Stock: 3491THS3112IDRG4 Datasheet

Current PartRFQ

HA5023IBZ

Renesas Electronics CorporationIn Stock: 1464HA5023IBZ Datasheet

MFR RecommendedRFQ

HA5023IBZ96

Renesas Electronics CorporationIn Stock: 2594HA5023IBZ96 Datasheet

MFR RecommendedRFQ

LT1229CS8#PBF

Analog Devices Inc.In Stock: 1770LT1229CS8#PBF Datasheet

MFR RecommendedRFQ

LT1229CS8#TRPBF

Analog Devices Inc.In Stock: 1552LT1229CS8#TRPBF Datasheet

MFR RecommendedRFQ

LT1497CS8#TRPBF

Analog Devices Inc.In Stock: 9591LT1497CS8#TRPBF Datasheet

MFR RecommendedRFQ

UPC1251G2-E1-A

Renesas Electronics CorporationIn Stock: 5934UPC1251G2-E1-A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the THS3112IDRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Amplifier topology: Current Feedback architecture
• Circuit count: Dual-channel (2 circuits minimum)
• Package compatibility: 8-SOIC surface mount form factor
• Electrical performance envelope: Slew rate, bandwidth, and output current capability
• Supply voltage range: Minimum 10V to maximum 30V span
• Operating temperature range: -40°C to 85°C

Secondary Compatibility Factors:

• Input bias current and input offset voltage characteristics
• Supply current consumption per channel
• RoHS3 compliance and MSL rating
• Regulatory compliance (REACH, ECCN)

The substitute parts identified below maintain functional equivalence within the allowed electrical and mechanical parameters. Substitutes are grouped by their active product status and packaging configuration (tube or tape & reel).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Current Feedback Amplifiers):

The HA5023IBZ and HA5023IBZ96 (Renesas Electronics) represent the most direct functional equivalents. Both devices maintain the current feedback topology, dual-channel configuration, and 8-SOIC package footprint. The HA5023 series offers higher -3dB bandwidth (125 MHz versus 110 MHz) and operates with dual supply voltages (±4.75V to ±18V). These parts are in active production status with substantial inventory availability (1431 and 2532 units respectively). The packaging distinction between tube (HA5023IBZ) and tape & reel (HA5023IBZ96) accommodates different manufacturing workflows.

The LT1229CS8#PBF and LT1229CS8#TRPBF (Analog Devices) provide current feedback amplification with moderate slew rate (700V/µs) and -3dB bandwidth (100 MHz). These devices support the full 4V to 30V supply range and maintain active product status. The LT1229 series exhibits higher input bias current (10 µA) compared to the THS3112IDRG4 (330 nA), which may affect precision applications. Packaging options include tube and tape & reel configurations.

The LT1497CS8#TRPBF (Analog Devices) operates as a current feedback amplifier with 900V/µs slew rate and 50 MHz bandwidth. This device is suitable for applications where bandwidth requirements are less stringent than the original specification. Supply voltage range spans 5V to 30V, and the part maintains active status with high inventory (9533 units).

Secondary Substitute (General Purpose Amplifier):

The UPC1251G2-E1-A (Renesas Electronics) represents a general-purpose amplifier topology rather than current feedback architecture. This device operates with push-pull output configuration and exhibits significantly lower supply current (700 µA). The UPC1251G2-E1-A supports the extended operating temperature range (-40°C to 85°C) matching the original specification. Package dimensions differ slightly (0.173" versus 0.154" width), requiring PCB layout verification. This substitute is appropriate only when current feedback topology is not functionally critical.

Compliance and Regulatory Status:

All identified substitutes maintain ROHS3 compliance, MSL rating of 1 (unlimited moisture sensitivity), REACH unaffected status, and ECCN EAR99 classification, ensuring regulatory equivalence with the THS3112IDRG4.

Temperature Range Consideration:

The LT1229 and LT1497 series operate within 0°C to 70°C, which is narrower than the THS3112IDRG4 specification (-40°C to 85°C). Applications requiring the full extended temperature range should prioritize HA5023 or UPC1251G2-E1-A substitutes.

Frequently Asked Questions (FAQ)

Q1: Can the HA5023IBZ directly replace the THS3112IDRG4 in existing PCB designs?

The HA5023IBZ maintains identical 8-SOIC package dimensions (0.154", 3.90mm width) and pinout compatibility with the THS3112IDRG4. Both devices are dual-channel current feedback amplifiers in surface mount configuration. PCB layout modifications are not required for package substitution. However, the HA5023IBZ operates with dual supply voltages (±4.75V to ±18V) rather than single supply (10V to 30V), necessitating circuit design review to confirm supply architecture compatibility.

Q2: What is the primary difference between HA5023IBZ and HA5023IBZ96?

Both parts are electrically identical Renesas HA5023 current feedback amplifiers with matching performance specifications. The distinction lies in packaging configuration: HA5023IBZ is supplied in tube packaging for manual handling and lower-volume applications, while HA5023IBZ96 is supplied in tape & reel format for automated assembly processes. Selection depends on manufacturing workflow requirements rather than electrical performance.

Q3: Why does the LT1229CS8#TRPBF show higher input bias current than the THS3112IDRG4?

The LT1229 series exhibits input bias current of 10 µA compared to the THS3112IDRG4 specification of 330 nA. This 30-fold difference reflects different semiconductor process technology and circuit design approaches. Applications sensitive to input bias current effects (precision transimpedance amplifiers, high-impedance signal sources) should evaluate this parameter against circuit requirements before substitution.

Q4: Is the UPC1251G2-E1-A suitable as a substitute for high-speed applications?

The UPC1251G2-E1-A is a general-purpose amplifier with push-pull output topology, not a current feedback amplifier. Slew rate and bandwidth specifications are not provided for this device. Substitution is appropriate only for applications where current feedback topology is not functionally required and where general-purpose amplification meets performance criteria. High-speed signal processing applications should prioritize current feedback alternatives (HA5023, LT1229, or LT1497 series).

Q5: What packaging considerations apply when selecting between tube and tape & reel options?

Tube packaging (HA5023IBZ, LT1229CS8#PBF) is suitable for manual component handling, prototyping, and low-volume production. Tape & reel packaging (HA5023IBZ96, LT1229CS8#TRPBF, LT1497CS8#TRPBF, UPC1251G2-E1-A) is optimized for automated pick-and-place assembly equipment and high-volume manufacturing. Selection depends on production volume, assembly infrastructure, and inventory management practices. Electrical performance is identical between packaging formats for the same part number.

Q6: Can the LT1497CS8#TRPBF be used in applications requiring 110 MHz bandwidth?

The LT1497CS8#TRPBF provides -3dB bandwidth of 50 MHz, which is substantially lower than the THS3112IDRG4 specification of 110 MHz. This device is suitable only for applications with bandwidth requirements at or below 50 MHz. Applications requiring 110 MHz bandwidth should select HA5023 (125 MHz) or LT1229 (100 MHz) alternatives.

Q7: What is the impact of operating temperature range differences on substitute selection?

The THS3112IDRG4 operates across -40°C to 85°C. The LT1229 and LT1497 series are rated for 0°C to 70°C, representing a narrower temperature envelope. Applications requiring operation below 0°C or above 70°C must select HA5023 or UPC1251G2-E1-A substitutes. Temperature range verification is essential for aerospace, automotive, and industrial applications subject to extended environmental conditions.

Q8: Are all substitute parts RoHS3 compliant?

All identified substitute parts (HA5023IBZ, HA5023IBZ96, LT1229CS8#PBF, LT1229CS8#TRPBF, LT1497CS8#TRPBF, and UPC1251G2-E1-A) maintain ROHS3 compliance status. Regulatory equivalence is confirmed across all substitutes, eliminating compliance risk in design transitions.