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Texas Instruments THS3112ID
- Part No.:
- THS3112ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3112ID.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
THS3112ID from Texas Instruments is a dual-channel, low-noise, high-speed current-feedback amplifier optimized for video distribution, piezo drivers, and motor control interfaces. It delivers 150 mA minimum output current, 110-MHz –3-dB bandwidth (G = 1, ±15 V), 1550-V/µs slew rate (G = 2), 2.2-nV/√Hz voltage noise, and operates from ±5 V to ±15 V supplies.
For engineers reviewing the THS3112ID datasheet, THS3112ID pinout, THS3112ID application, or THS3112ID equivalent, this page provides verified pin mapping, industrial-temperature performance data, noise/distortion trade-offs at 1 MHz and 10 kHz, and validated alternatives for high-current, wide-bandwidth analog signal conditioning.
Technical Context
The THS3112ID uses current-feedback architecture with transimpedance gain stage, enabling high slew rate and bandwidth independent of closed-loop gain. Its noninverting input presents 1.5 MΩ resistance and 2 pF capacitance, while inverting input is 15 Ω, supporting stable operation with RF = 750 Ω at G = 2.
It features rail-to-rail output swing capability (±12.2 V into 100 Ω at ±15 V supply), low 10.8-pA/√Hz inverting current noise, and maintains –78 dBc THD at 1 MHz with 2-VPP output into 100 Ω - critical for precision video and fast transient fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 110 MHz at G = 1, ±15 V - enables full HD video baseband amplification without gain-dependent roll-off |
| Slew Rate | 1550 V/µs at G = 2, ±15 V - supports sub-10 ns settling for 5-V step transitions |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-amplitude sensor and video signal chains |
| Output Current | 150 mA min into 25 Ω - drives multiple 75-Ω video lines or piezoelectric loads directly |
| Supply Range | ±5 V to ±15 V - accommodates legacy industrial rails and high-headroom analog stages |
| THD @ 1 MHz | –78 dBc at 2-VPP, 100-Ω load - meets broadcast-grade video distortion requirements |
| Operating Temp | –40°C to +85°C - qualified for industrial motor drive and outdoor video equipment |
Pinout & Package
THS3112ID is available in SOIC-8 (D) and SOIC PowerPAD™ (DDA) packages. The SOIC-8 variant uses standard 8-pin layout with exposed thermal pad on underside for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Channel 1 output - drives high-current loads; requires external feedback network |
| 2 | OUT2 | Channel 2 output - independent output node; shares no internal coupling with OUT1 |
| 3 | IN1– | Inverting input for Channel 1 - low 15-Ω impedance mandates precise RF matching |
| 4 | IN2– | Inverting input for Channel 2 - isolated from IN1–; enables dual independent current-feedback paths |
| 5 | IN2+ | Noninverting input for Channel 2 - 1.5-MΩ input resistance; used for unity-gain buffer configurations |
| 6 | IN1+ | Noninverting input for Channel 1 - decoupled bias path; supports DC-coupled single-supply operation |
| 7 | VCC– | Negative supply rail - connects to –5 V to –15 V; must be low-impedance for noise rejection |
| 8 | VCC+ | Positive supply rail - connects to +5 V to +15 V; shared across both channels |
Key Features
| Feature | Design Value |
|---|---|
| Low inverting current noise | 10.8 pA/√Hz at 10 kHz - minimizes error in high-source-impedance transimpedance stages |
| High output current drive | 270 mA peak into 25 Ω - sustains fast edge rates under heavy capacitive loads (e.g., FET gates) |
| Wide supply range | ±5 V to ±15 V - eliminates need for level-shifting in mixed-voltage systems |
| Industrial temperature grade | –40°C to +85°C operation - ensures stability in motor drive enclosures and outdoor video hubs |
| Low THD at high frequency | –78 dBc at 1 MHz, 2-VPP - preserves chroma/luma integrity in RGB and component video paths |
Applications
| Video Distribution Amplifier | Piezo Actuator Driver |
|---|---|
Use Scenario: Distributing composite or RGB video signals to 4–8 coaxial outputs with minimal crosstalk and group delay. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier providing simultaneous gain-of-2 buffering with <0.011° differential phase error. Use Value: Maintains 0.1-dB flatness up to 7× passband frequency (e.g., >21 MHz for 3-MHz NTSC), preserving color fidelity. | Use Scenario: Driving high-capacitance piezoelectric transducers in precision positioning stages or ultrasonic cleaners. IC Role / Device Role / Timing Role: High-slew-rate voltage source delivering fast charge/discharge pulses with controlled rise/fall times. Use Value: 1550-V/µs slew rate enables <100 ns transitions across 100-V p-p piezo excitation waveforms. |
| Motor Phase Current Sense | High-Speed ADC Driver |
Use Scenario: Amplifying low-level shunt voltage signals in three-phase BLDC motor controllers operating at 20+ kHz PWM. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth buffer isolating ADC input from noisy power-stage switching nodes. Use Value: 2.2-nV/√Hz voltage noise and –78 dBc THD ensure <16-bit ENOB at 1 MSPS sampling rates. | Use Scenario: Driving SAR or pipeline ADC inputs requiring fast settling, low distortion, and high dynamic range. IC Role / Device Role / Timing Role: Unity-gain stable current-feedback driver optimizing bandwidth vs. settling time trade-off. Use Value: 63 ns 0.1% settling time (±15 V) enables full-scale transitions within 12-bit accuracy at >10 MSPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3112CD | Same electrical specs but commercial temperature range (0°C to +70°C); no PowerPAD option in D package | Not rated for industrial ambient conditions; unsuitable for motor drive enclosures or outdoor video hardware | Select THS3112CD only for lab-grade test equipment or indoor consumer electronics |
| THS3092ID | Higher slew rate (2000 V/µs), lower THD (–82 dBc), but higher voltage noise (3.3 nV/√Hz); same pinout | Better for repetitive sine/square-wave signals >900 V/µs; not recommended for pulsed-only use cases where THS3112ID excels | Choose THS3092ID when driving continuous high-frequency waveforms with strict harmonic suppression needs |
Compared with THS3112CD and THS3092ID, THS3112ID uniquely balances industrial-temperature reliability, ultra-low voltage noise, and proven stability in video and piezo pulse applications - making it optimal for field-deployed analog signal conditioning where long-term parametric drift must be minimized.
Availability
THS3112ID is available at Aetrix Electronics and suitable for video distribution systems, industrial motor control interfaces, and high-precision piezo actuation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for THS3112ID includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 50 years of innovation in high-performance amplifiers and data converters.
The THS3112ID belongs to TI's THS31xx family of current-feedback amplifiers, engineered specifically for applications demanding simultaneous high slew rate, wide bandwidth, and low distortion - especially in video infrastructure, test instrumentation, and precision motion control.
FAQ
What is the maximum safe supply voltage for THS3112ID?
The absolute maximum supply voltage for THS3112ID is ±16.5 V (33 V total), but the recommended operating range is ±5 V to ±15 V. Exceeding ±15 V risks exceeding junction temperature limits even at room temperature due to increased quiescent power dissipation (6.5 mA per channel typical at ±15 V). Always observe derating curves in the Dissipation Ratings Table for SOIC-8 (D) and SOIC PowerPAD (DDA) packages when operating near max ratings.
Does THS3112ID support single-supply operation?
Yes, THS3112ID supports single-supply operation from 10 V to 30 V. For optimal performance, bias the noninverting inputs at mid-supply using matched resistors or a reference divider, and AC-couple inputs/outputs if DC accuracy is not required. The input common-mode range extends to ±12.7 V at ±15 V supply, enabling robust headroom in single-rail configurations like +12 V systems with 6-V bias.
What is the recommended feedback resistor value for G = 2 configuration with THS3112ID?
The datasheet specifies RF = 750 Ω for G = 2 with RL = 100 Ω and ±15 V supply to achieve optimal bandwidth (110 MHz) and minimal peaking. Using RF = 680 Ω improves slew rate margin but increases gain peaking; RF > 750 Ω reduces bandwidth and improves stability. Always verify phase margin with actual PCB parasitics using the small-signal gain vs. frequency plots in Figures 1–9 of the THS3112ID datasheet.
How does THS3112ID handle capacitive loads?
THS3112ID becomes unstable with direct capacitive loads >100 pF. To drive such loads, insert an isolation resistor (RISO = 5.11 Ω to 50 Ω) between output and load, or use a ferrite bead with ~30 Ω impedance at 100 MHz. Figure 43–47 in the THS3112ID datasheet provide validated RISO vs. CLOAD curves and feedback compensation techniques that preserve bandwidth while ensuring ≥45° phase margin.
Is THS3112ID pin-compatible with THS3115ID?
No, THS3112ID is not pin-compatible with THS3115ID. THS3112ID uses an 8-pin SOIC (D) or SOIC PowerPAD (DDA) package with two independent amplifier channels and no shutdown or reference pins. THS3115ID uses a 14-pin TSSOP PowerPAD (PWP) or SOIC-14 (D) package and adds SHUTDOWN and REF pins - requiring PCB redesign and updated biasing networks for substitution.
THS3112ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1550V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 110 MHz
- Current - Input Bias:
- 330 nA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 4.9mA (x2 Channels)
- Current - Output / Channel:
- 270 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS3112ID FAQ
1.How can I place an order for THS3112ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3112ID on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for THS3112ID reliable?
The price and inventory of THS3112ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3112ID is usually 5 days.
3.What payment methods are accepted for THS3112ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3112ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3112ID?
THS3112ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3112ID order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for THS3112ID?
For technical support, including THS3112ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3112ID requirements.
6.How does Aetrix verify that THS3112ID is sourced from the original manufacturer or authorized distributors?
All THS3112ID products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that THS3112ID meets industry standards.
7.What is the process for return or replacement of THS3112ID?
All THS3112ID units undergo pre-shipment inspection (PSI). If there is an issue with THS3112ID, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The THS3112ID part is unused and in its original packaging.
Return procedure for THS3112ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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