THS3112ID Current Feedback Amplifier Equivalent & Substitute Parts

Part Overview

The THS3112ID 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 inventory availability. The THS3112ID delivers high-speed amplification with a 1550 V/µs slew rate and 110 MHz bandwidth, suitable for applications requiring fast signal processing in compact form factors. Due to its Last Time Buy status, identifying functionally compatible substitute parts is essential for design continuity and long-term supply chain planning.

Substiute Parts

THS3112ID

Texas InstrumentsIn Stock: 1177THS3112ID 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

LT1229CS8#TRPBF

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

MFR RecommendedRFQ

UPC1251G2-E1-A

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the THS3112ID are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Criteria:

• Amplifier topology: Current Feedback architecture
• Circuit count: Dual-channel (2 circuits)
• Package type: 8-SOIC surface mount form factor
• Supply voltage range: Minimum 10 V to maximum 30 V
• Operating temperature: -40°C to 85°C industrial range
• RoHS3 compliance and MSL Level 1 rating

Performance Consideration Parameters:

• Slew rate (1550 V/µs baseline)
• Bandwidth (-3dB at 110 MHz baseline)
• Input bias current (330 nA baseline)
• Output current capability (270 mA per channel baseline)

Substitutes are grouped into two categories:

Group 1 - Direct Current Feedback Amplifiers (THS3092D, LT1229CS8#PBF, LT1229CS8#TRPBF): These parts maintain current feedback topology with dual channels in 8-SOIC packaging and identical supply voltage specifications. Performance parameters exceed or match the THS3112ID baseline.

Group 2 - Alternative Topology Amplifiers (HA5023IBZ, HA5023IBZ96, UPC1251G2-E1-A): These parts provide dual-channel amplification in compatible packaging with overlapping supply voltage ranges but employ different amplifier architectures or performance characteristics. Substitution requires application-level verification of topology compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

THS3092D (Texas Instruments, Active Status) is the manufacturer-recommended primary substitute. It maintains identical current feedback topology, dual-channel configuration, 8-SOIC packaging, and 10-30 V supply range. The THS3092D exceeds THS3112ID performance with 5700 V/µs slew rate and 160 MHz bandwidth. Supply current increases from 4.9 mA to 9.5 mA per channel. This substitute is suitable for applications where higher performance margins are acceptable and increased power consumption is tolerable.

LT1229CS8#PBF and LT1229CS8#TRPBF (Analog Devices Inc., Active Status) provide current feedback amplification in identical 8-SOIC packaging with 10-30 V supply compatibility. These parts deliver 700 V/µs slew rate and 100 MHz bandwidth, slightly below THS3112ID performance. Output current per channel is 125 mA, significantly lower than the THS3112ID's 270 mA. Operating temperature range is 0°C to 70°C, narrower than the THS3112ID's -40°C to 85°C. These substitutes are appropriate for applications with relaxed performance requirements and narrower temperature operating windows. LT1229CS8#TRPBF is available in Tape & Reel packaging for high-volume production.

Secondary Substitutes (Conditional Compatibility):

HA5023IBZ and HA5023IBZ96 (Renesas Electronics Corporation, Active Status) are current feedback amplifiers in 8-SOIC packaging with 125 MHz bandwidth. Supply voltage operates in ±4.75 V to ±18 V range, requiring dual supply configuration versus the THS3112ID's single supply operation. Output current per channel is limited to 20 mA. These parts are suitable only for applications redesigned for dual-supply operation with lower output current requirements. HA5023IBZ96 is available in Tape & Reel format.

UPC1251G2-E1-A (Renesas Electronics Corporation, Active Status) is a general-purpose amplifier with push-pull output topology, differing fundamentally from the THS3112ID's current feedback architecture. Package width is 4.40 mm versus 3.90 mm for THS3112ID, requiring PCB layout verification. Supply current is significantly lower at 700 µA. This substitute is applicable only when general-purpose amplification topology is acceptable and output current requirement is 70 mA or less.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001, maintaining identical regulatory classification as the THS3112ID.

Frequently Asked Questions (FAQ)

Q1: Can THS3092D directly replace THS3112ID in existing PCB designs without modification?

A: THS3092D is pin-compatible and functionally compatible in 8-SOIC packaging. However, increased supply current (9.5 mA versus 4.9 mA per channel) requires verification that power supply and thermal design accommodate the higher power dissipation. No PCB layout changes are required.

Q2: What is the primary reason for substituting THS3112ID?

A: THS3112ID is classified as Last Time Buy, indicating production discontinuation. Substitute parts ensure design continuity and supply chain stability for new production runs and long-term product support.

Q3: Are LT1229CS8#PBF and LT1229CS8#TRPBF interchangeable?

A: These parts are electrically identical. The difference is packaging format: LT1229CS8#PBF is supplied in Tube packaging for lower-volume applications, while LT1229CS8#TRPBF is supplied in Tape & Reel format for automated assembly and higher-volume production.

Q4: Why does HA5023IBZ require dual supply voltage while THS3112ID operates on single supply?

A: HA5023IBZ is designed for video amplifier applications requiring ±4.75 V to ±18 V dual supply configuration. THS3112ID operates on single supply 10-30 V. Substitution requires circuit redesign to accommodate dual supply topology.

Q5: What is the output current limitation when using UPC1251G2-E1-A as a substitute?

A: UPC1251G2-E1-A provides 70 mA per channel output current, compared to THS3112ID's 270 mA. Applications requiring output currents exceeding 70 mA cannot use this substitute without additional output buffering stages.

Q6: Do all substitute parts support the full -40°C to 85°C industrial temperature range?

A: No. LT1229CS8#PBF and LT1229CS8#TRPBF operate only 0°C to 70°C. Applications requiring -40°C to 85°C operation must use THS3092D, HA5023IBZ, HA5023IBZ96, or UPC1251G2-E1-A.

Q7: Is the 8-SOIC package identical across all substitute parts?

A: Package type is 8-SOIC for all substitutes. However, UPC1251G2-E1-A has 4.40 mm width versus 3.90 mm for other parts. PCB footprint verification is required for UPC1251G2-E1-A to ensure clearance and routing compatibility.

Q8: Which substitute offers the best performance improvement over THS3112ID?

A: THS3092D provides the highest performance with 5700 V/µs slew rate (3.68× higher) and 160 MHz bandwidth (1.45× higher) compared to THS3112ID. Trade-off is increased supply current consumption.

Q9: Can HA5023IBZ be used in single-supply applications?

A: HA5023IBZ is specified for dual supply operation (±4.75 V to ±18 V). Single-supply operation requires custom biasing circuit design and is not recommended without extensive application-level testing.

Q10: What inventory status should influence substitute selection?

A: THS3092D has 3100 pcs in stock (highest availability), followed by HA5023IBZ96 (2532 pcs) and UPC1251G2-E1-A (5911 pcs). For long-term supply security, THS3092D or UPC1251G2-E1-A are preferred based on application requirements.