THS3112IDDA Equivalent & Substitute Parts

Part Overview

The THS3112IDDA is a Current Feedback Amplifier manufactured by Texas Instruments, featuring 2 circuits in an 8-PowerSOIC package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The THS3112IDDA delivers a slew rate of 1550V/µs and -3dB bandwidth of 110 MHz, suitable for applications requiring moderate-speed signal amplification with dual-channel configuration.

Due to Last Time Buy status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain planning. Substitute parts listed below maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

THS3112IDDA

Texas InstrumentsIn Stock: 904THS3112IDDA Datasheet

Current PartRFQ

THS3092DDAR

Texas InstrumentsIn Stock: 2342THS3092DDAR Datasheet

MFR RecommendedRFQ

HA5023IBZ

Renesas Electronics CorporationIn Stock: 1464HA5023IBZ Datasheet

MFR RecommendedRFQ

HA5023IBZ96

Renesas Electronics CorporationIn Stock: 2594HA5023IBZ96 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 THS3112IDDA are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Amplifier Type: Current Feedback
• Number of Circuits: 2
• Package Type: 8-pin surface mount (8-PowerSOIC or 8-SOIC)
• Voltage Supply Range: Minimum 10V to Maximum 30V
• Operating Temperature Range: -40°C to 85°C
• RoHS3 Compliance and MSL Level 1

Secondary Compatibility Parameters:

• Slew Rate: 1550V/µs or higher
• -3dB Bandwidth: 110 MHz or higher
• Current Output per Channel: 270 mA or higher
• Input Bias Current: 330 nA or lower
• Input Offset Voltage: 3 mV or lower

Substitutes are classified into two groups: Direct Manufacturer Alternatives (Texas Instruments THS3092DDAR) and Cross-Manufacturer Equivalents (Renesas HA5023IBZ/HA5023IBZ96, Analog Devices LT1229CS8#TRPBF, and Renesas UPC1251G2-E1-A).

Parameter Comparison

Engineering Selection Recommendations

THS3092DDAR (Texas Instruments) - Recommended Primary Substitute

The THS3092DDAR is the manufacturer-recommended substitute for the THS3112IDDA. Both devices are Current Feedback Amplifiers with identical dual-circuit configuration, 8-PowerSOIC packaging, and -40°C to 85°C operating temperature range. The THS3092DDAR maintains full voltage supply compatibility (10V to 30V) and exceeds the THS3112IDDA in performance specifications: slew rate of 5700V/µs versus 1550V/µs, and -3dB bandwidth of 160 MHz versus 110 MHz. Current output per channel (280 mA) meets the 270 mA requirement. The THS3092DDAR is Active status with 2240 units in stock, ensuring supply continuity. ROHS3 compliance and MSL Level 1 certification match the original part.

HA5023IBZ and HA5023IBZ96 (Renesas Electronics) - Cross-Manufacturer Alternatives

Both HA5023 variants are Current Feedback Amplifiers with 2 circuits in 8-SOIC packages. The primary distinction is packaging: HA5023IBZ is supplied in Tube format, while HA5023IBZ96 is supplied in Tape & Reel format. These devices operate with ±4.75V to ±18V dual supply, differing from the THS3112IDDA's single 10V to 30V supply specification. The -3dB bandwidth of 125 MHz exceeds the THS3112IDDA requirement. However, current output per channel (20 mA) is significantly lower than the 270 mA specification, limiting suitability for high-current applications. Both variants are Active status with substantial inventory (1431 and 2532 units respectively) and ROHS3 compliance.

LT1229CS8#TRPBF (Analog Devices) - Performance-Matched Alternative

The LT1229CS8#TRPBF is a Current Feedback Amplifier with 2 circuits in 8-SOIC package supplied in Tape & Reel format. This device operates within the 4V to 30V supply range, encompassing the THS3112IDDA specification. The -3dB bandwidth of 100 MHz is slightly below the THS3112IDDA (110 MHz), and slew rate of 700V/µs is lower. Current output per channel (125 mA) is below the 270 mA requirement. Operating temperature range is 0°C to 70°C, narrower than the THS3112IDDA's -40°C to 85°C. The LT1229CS8#TRPBF is Active status with 1450 units in stock and ROHS3 compliance. This substitute is suitable for applications not requiring extended low-temperature operation or high output current.

UPC1251G2-E1-A (Renesas Electronics) - Limited Compatibility

The UPC1251G2-E1-A is a General Purpose Amplifier (not Current Feedback) with 2 circuits in 8-SOIC package. This device operates within the 3V to 30V supply range and features exceptionally low supply current (700µA). However, the General Purpose amplifier type differs fundamentally from the Current Feedback architecture of the THS3112IDDA, making this substitute suitable only for applications where Current Feedback topology is not critical. Current output per channel (70 mA) is significantly lower than the 270 mA requirement. The UPC1251G2-E1-A is Active status with 5911 units in stock and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q1: Can the THS3092DDAR directly replace the THS3112IDDA without PCB modifications?

A: Yes. Both devices use identical 8-PowerSOIC packaging with matching pinout and electrical interface. The THS3092DDAR operates within the same voltage supply range (10V to 30V) and temperature range (-40°C to 85°C). No PCB layout changes are required. The THS3092DDAR's superior performance specifications (higher slew rate and bandwidth) ensure compatibility with existing designs.

Q2: Why do the HA5023IBZ variants have lower current output specifications than the THS3112IDDA?

A: The HA5023IBZ and HA5023IBZ96 are optimized for video amplifier applications with 20 mA output per channel, whereas the THS3112IDDA is designed for general-purpose current feedback applications requiring 270 mA output. These devices serve different application classes. Selection depends on whether the design requires high output current capability.

Q3: What is the significance of the HA5023IBZ96 Tape & Reel packaging versus HA5023IBZ Tube packaging?

A: Tape & Reel (TR) packaging is standard for automated assembly lines and high-volume production, while Tube packaging is used for lower-volume or manual assembly processes. Both variants are electrically identical. Selection depends on manufacturing process requirements and volume needs. HA5023IBZ96 offers higher inventory (2532 units) in Tape & Reel format.

Q4: Is the LT1229CS8#TRPBF suitable for applications requiring -40°C operation?

A: No. The LT1229CS8#TRPBF operates from 0°C to 70°C, which does not include the -40°C lower temperature limit of the THS3112IDDA. For designs requiring extended low-temperature operation, the THS3092DDAR or UPC1251G2-E1-A (which supports -40°C) are appropriate alternatives.

Q5: Why is the UPC1251G2-E1-A classified as having limited compatibility despite being a 2-circuit amplifier in 8-SOIC package?

A: The UPC1251G2-E1-A is a General Purpose Amplifier with Push-Pull output topology, fundamentally different from the Current Feedback architecture of the THS3112IDDA. Current Feedback amplifiers have distinct frequency response, transimpedance characteristics, and feedback network requirements compared to General Purpose amplifiers. Substitution is valid only for applications where amplifier topology is not performance-critical.

Q6: What is the impact of the THS3112IDDA's Last Time Buy status on component selection?

A: Last Time Buy status indicates production discontinuation with limited remaining inventory (826 units). This necessitates transition to an active-production substitute for long-term design support. The THS3092DDAR is the manufacturer-recommended transition path, offering superior specifications and active production status with 2240 units in stock.

Q7: Are all substitute parts ROHS3 compliant and MSL Level 1?

A: Yes. All substitute parts listed (THS3092DDAR, HA5023IBZ, HA5023IBZ96, LT1229CS8#TRPBF, and UPC1251G2-E1-A) are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the THS3112IDDA environmental and regulatory compliance profile.

Q8: Which substitute part offers the best performance upgrade from the THS3112IDDA?

A: The THS3092DDAR provides the most significant performance improvement, with slew rate increased from 1550V/µs to 5700V/µs (3.68x improvement) and -3dB bandwidth increased from 110 MHz to 160 MHz (1.45x improvement). This upgrade maintains identical packaging and supply voltage compatibility while enhancing signal fidelity and frequency response.