THS3112CDR Current Feedback Amplifier Equivalent & Substitute Parts

Part Overview

The THS3112CDR is a dual-channel current feedback amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory (745 pcs). The THS3112CDR delivers high-speed signal conditioning with a 1550V/µs slew rate and 110 MHz bandwidth, suitable for applications requiring fast transient response in compact form factors. Identifying equivalent and substitute parts is necessary due to the Last Time Buy status and potential future supply constraints.

Substiute Parts

THS3112CDR

Texas InstrumentsIn Stock: 818THS3112CDR Datasheet

Current PartRFQ

THS3092D

Texas InstrumentsIn Stock: 3204THS3092D Datasheet

MFR RecommendedRFQ

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

LT1497CS8#PBF

Analog Devices Inc.In Stock: 993LT1497CS8#PBF Datasheet

MFR RecommendedRFQ

UPC1251G2-E1-A

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the THS3112CDR is determined by the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type: Current Feedback (mandatory for functional equivalence)
• Number of Circuits: 2 (dual-channel configuration)
• Package / Case: 8-SOIC form factor (mechanical compatibility)
• Mounting Type: Surface Mount (assembly compatibility)
• Voltage - Supply Span: Minimum 10V to 30V maximum (power supply compatibility)

Secondary Compatibility Parameters:

• Slew Rate: Minimum 1550V/µs (performance threshold)
• -3dB Bandwidth: Minimum 110 MHz (frequency response requirement)
• Current - Output / Channel: Minimum 270 mA (load driving capability)
• RoHS3 Compliance and MSL Level 1 (regulatory and environmental requirements)

The substitute parts are grouped into two categories based on these criteria:

Category A - Direct Current Feedback Amplifiers (Preferred): THS3092D, LT1229CS8#PBF, LT1497CS8#PBF maintain current feedback topology with dual-channel configuration and 8-SOIC packaging.

Category B - Alternative Feedback Topologies (Limited Compatibility): HA5023IBZ, HA5023IBZ96, UPC1251G2-E1-A offer similar performance characteristics but with different amplifier architectures or output configurations.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Recommended Direct Substitutes (Highest Compatibility):

THS3092D (Texas Instruments, Active Status): Maintains current feedback topology with dual-channel 8-SOIC configuration. Exceeds THS3112CDR performance specifications with 5700V/µs slew rate and 160 MHz bandwidth. Extended operating temperature range (-40°C to 85°C) provides broader environmental coverage. Higher supply current (9.5 mA vs 4.9 mA) and marginally higher output current (280 mA vs 270 mA) support demanding load conditions. ROHS3 compliant with MSL Level 1. Suitable for direct replacement in applications where enhanced performance is acceptable.

LT1229CS8#PBF (Analog Devices, Active Status): Current feedback amplifier with dual-channel 8-SOIC packaging. Slew rate of 700V/µs and 100 MHz bandwidth meet minimum THS3112CDR specifications. Lower minimum supply voltage (4V vs 10V) enables operation in lower-voltage systems. Output current of 125 mA is below THS3112CDR capability but sufficient for moderate-load applications. Operating temperature range matches THS3112CDR (0°C to 70°C). ROHS3 compliant with MSL Level 1.

LT1497CS8#PBF (Analog Devices, Active Status): Current feedback amplifier with dual-channel 8-SOIC configuration. Slew rate of 900V/µs exceeds minimum threshold. -3dB bandwidth of 50 MHz falls below THS3112CDR specification (110 MHz), limiting high-frequency performance. Output current of 220 mA approaches THS3112CDR capability. Operating temperature range matches THS3112CDR (0°C to 70°C). ROHS3 compliant with MSL Level 1. Suitable for applications with reduced bandwidth requirements.

Tier 2 - Alternative Substitutes (Conditional Compatibility):

HA5023IBZ and HA5023IBZ96 (Renesas, Active Status): Current feedback video amplifiers with dual-channel 8-SOIC packaging. -3dB bandwidth of 125 MHz exceeds THS3112CDR specification. Slew rate of 350V/µs falls significantly below THS3112CDR (1550V/µs), limiting transient response capability. Output current of 20 mA is substantially lower than THS3112CDR (270 mA), restricting load-driving capability. Dual supply voltage configuration (±4.75V to ±18V) differs from THS3112CDR single supply (10V to 30V). ROHS3 compliant with MSL Level 1. Suitable only for low-power, video-frequency applications.

UPC1251G2-E1-A (Renesas, Active Status): General-purpose amplifier with dual-channel 8-SOIC packaging. Amplifier type differs from THS3112CDR (general purpose vs. current feedback), affecting circuit behavior and compensation requirements. Output current of 70 mA is substantially lower than THS3112CDR. Slew rate and bandwidth specifications not provided. Extended operating temperature range (-40°C to 85°C) and lower supply current (0.7 mA) offer advantages in power-constrained applications. ROHS3 compliant with MSL Level 1. Substitution requires circuit redesign and performance verification.

Regulatory and Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring compatibility with standard manufacturing and storage practices. REACH status is unaffected for all parts. ECCN classification remains EAR99 for all devices, maintaining consistent export control status.

Frequently Asked Questions (FAQ)

Q1: Can THS3092D directly replace THS3112CDR without circuit modifications?

A: THS3092D is pin-compatible and functionally equivalent as a current feedback amplifier. However, performance differences exist: THS3092D provides higher slew rate (5700V/µs vs 1550V/µs) and bandwidth (160 MHz vs 110 MHz). Applications sensitive to these performance characteristics may require circuit optimization. Extended temperature range (-40°C to 85°C vs 0°C to 70°C) and higher supply current (9.5 mA vs 4.9 mA) must be evaluated for specific designs.

Q2: Why does LT1497CS8#PBF have lower -3dB bandwidth than THS3112CDR?

A: LT1497CS8#PBF is specified with 50 MHz -3dB bandwidth, below the THS3112CDR specification of 110 MHz. This reflects different design optimization priorities within the current feedback amplifier family. Applications requiring 110 MHz or higher bandwidth must use THS3092D, HA5023IBZ, or HA5023IBZ96 instead.

Q3: Are HA5023IBZ and HA5023IBZ96 interchangeable?

A: HA5023IBZ and HA5023IBZ96 are functionally identical current feedback amplifiers with identical electrical specifications. The primary difference is packaging: HA5023IBZ is supplied in Tube packaging, while HA5023IBZ96 is supplied in Tape & Reel (TR) packaging. Selection depends on assembly process requirements and inventory management practices.

Q4: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (Small Outline Integrated Circuit) package is a surface mount form factor with 0.154" (3.90mm) width. All substitute parts maintain this package specification, ensuring mechanical compatibility with existing PCB layouts and assembly equipment. Package compatibility eliminates the need for PCB redesign.

Q5: Can UPC1251G2-E1-A replace THS3112CDR in high-speed applications?

A: UPC1251G2-E1-A is a general-purpose amplifier, not a current feedback amplifier. Functional differences in circuit topology, compensation requirements, and frequency response characteristics make direct substitution unsuitable for high-speed applications. Slew rate and bandwidth specifications are not provided for UPC1251G2-E1-A, preventing performance comparison. Circuit redesign and extensive testing would be required.

Q6: What supply voltage considerations apply when substituting parts?

A: THS3112CDR operates with single supply voltage from 10V to 30V. HA5023IBZ and HA5023IBZ96 require dual supply voltage (±4.75V to ±18V), necessitating different power supply architecture. THS3092D, LT1229CS8#PBF, and LT1497CS8#PBF maintain single supply voltage compatibility (10V to 30V, 4V to 30V, and 5V to 30V respectively). Supply voltage architecture must be verified before substitution.

Q7: How does input bias current affect substitution decisions?

A: THS3112CDR specifies 330 nA input bias current. Substitute parts vary: THS3092D (4 µA), LT1229CS8#PBF (10 µA), LT1497CS8#PBF (7 µA), and UPC1251G2-E1-A (14 nA). Higher input bias current increases input impedance loading and may affect circuit performance in high-impedance source applications. Applications with impedance-sensitive inputs should prioritize substitutes with lower input bias current.

Q8: What is the Last Time Buy status and why does it matter?

A: Last Time Buy status indicates that THS3112CDR production has been discontinued and remaining inventory (745 pcs) represents the final available supply. After inventory depletion, the part will no longer be available from the manufacturer. Identifying and qualifying substitute parts ensures long-term design continuity and supply chain reliability for new production runs and future product revisions.