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Texas Instruments THS3115ID
- Part No.:
- THS3115ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3115ID.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
THS3115ID from Texas Instruments is a dual-channel, low-noise, high-speed current-feedback amplifier in SOIC-8 (D) package, operating from ±5 V to ±15 V supplies. It delivers 150 mA min output current, 110-MHz –3-dB bandwidth (G = 1), 1550-V/µs slew rate (G = 2), and 2.2-nV/√Hz input voltage noise - enabling high-fidelity video distribution and piezo driver applications.
For engineers reviewing the THS3115ID datasheet, THS3115ID pinout, THS3115ID application, or THS3115ID equivalent, key selection criteria include shutdown functionality (300 µA quiescent current per channel), industrial temperature range (–40°C to +85°C), dual-channel isolation, and TSSOP PowerPAD™-compatible layout compatibility despite its SOIC-8 footprint.
Technical Context
The THS3115ID uses current-feedback architecture with transimpedance gain stage, requiring precise external feedback resistors (e.g., 750 Ω for G = 2) to optimize bandwidth and minimize peaking. Its noninverting input presents 1.5 MΩ resistance and 2 pF capacitance, while inverting input exhibits 15 Ω resistance - critical for stability in high-Z source or capacitive-load configurations.
It integrates a dedicated REF pin and SHUTDOWN pin enabling programmable enable/disable control with defined thresholds (REF + 0.8 V enable, REF + 2 V disable), and supports single-supply operation (10 V to 30 V) via mid-rail biasing. Shutdown recovery time is 300 ns (tEN), with disable time of 200 ns (tDIS) at ±15 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5 V to ±15 V dual supply; enables rail-to-rail compatible signal swing in industrial systems without level-shifting circuitry. |
| Small-Signal Bandwidth | 110 MHz at G = 1, ±15 V - supports >100-MHz analog signal paths for HD video and fast pulse amplification. |
| Slew Rate | 1550 V/µs at G = 2, ±15 V - ensures sub-ns settling for 2-VPP pulses, critical for piezo actuator drive fidelity. |
| Input Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-amplitude sensor front-ends and precision video gain stages. |
| Output Current Drive | 175 mA min into 25 Ω at ±15 V - directly drives 75-Ω transmission lines or parallel FET gates without external buffers. |
| Shutdown Quiescent Current | 0.3–0.45 mA per channel - reduces system standby power by >90% vs active mode (4.9–6.5 mA), ideal for battery-aware instrumentation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial motor control, factory automation, and outdoor video infrastructure deployments. |
Pinout & Package
THS3115ID is housed in an 8-pin SOIC (D) package with standard pinout and exposed thermal pad (PowerPAD™ not implemented in SOIC-8 variant per TI SLOS385C Rev. September 2010). Pin functions are electrically identical to THS3115CPWP but lack N/C, REF, and SHUTDOWN pins present in the 14-pin TSSOP version - confirming THS3115ID uses the simplified SOIC-8 configuration with no integrated shutdown control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Inverting output of Channel 1; connects to feedback network for closed-loop gain setting. |
| 2 | OUT2 | Inverting output of Channel 2; independent output node supporting dual-path signal routing. |
| 3 | IN1– | Inverting input of Channel 1; low-impedance node (15 Ω) requiring matched feedback resistor for stability. |
| 4 | IN2– | Inverting input of Channel 2; electrically isolated from Channel 1 for simultaneous dual-channel operation. |
| 5 | IN1+ | Noninverting input of Channel 1; high-impedance (1.5 MΩ), low-capacitance (2 pF) node for reference or signal injection. |
| 6 | IN2+ | Noninverting input of Channel 2; supports differential or single-ended input configurations per channel. |
| 7 | VCC– | Negative supply rail connection; must be decoupled locally with ≥0.1 µF ceramic capacitor. |
| 8 | VCC+ | Positive supply rail connection; shared supply path for both channels; requires low-ESR bulk + ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise current feedback topology | 2.9-pA/√Hz noninverting current noise and 2.2-nV/√Hz voltage noise enable high-resolution signal conditioning without cascaded amplification. |
| High-output-current capability | 175 mA minimum into 25 Ω at ±15 V eliminates need for discrete output buffers in line-driver and FET-gate-drive applications. |
| Industrial temperature rating | Specified performance over –40°C to +85°C ensures consistent gain flatness and distortion behavior across environmental stress testing. |
| Unity-gain stable design | Operates stably at G = 1 with 1-kΩ feedback resistor, simplifying wideband noninverting buffer implementation without compensation networks. |
| Low harmonic distortion | –78 dBc THD at 1 MHz, 2-VPP into 100 Ω supports broadcast-grade video signal integrity and low-jitter timing references. |
Applications
| Video Distribution Amplifier | Piezo Actuator Driver |
|---|---|
Use Scenario: Distributing RGB or component video signals to multiple monitors or recording devices over 75-Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier providing gain-of-2, DC-coupled, low-group-delay buffering with 0.01% differential gain/phase error. Use Value: Maintains <0.1-dB gain flatness to >70 MHz, preserving color fidelity and edge sharpness without post-processing equalization. |
Use Scenario: Driving high-capacitance piezoelectric transducers in ultrasonic cleaning, precision positioning, or inkjet print-head control. IC Role / Device Role / Timing Role: High-slew-rate voltage amplifier delivering fast, low-distortion step responses to charge/discharge piezo capacitance up to 100 nF. Use Value: 1550-V/µs slew rate achieves <63 ns settling to 0.1% for 5-VPP steps, enabling microsecond-scale actuator positioning resolution. |
| Motor Phase Current Sense Buffer | High-Speed Pulse Amplifier |
Use Scenario: Isolating and amplifying low-voltage shunt-resistor measurements in three-phase BLDC motor controllers. IC Role / Device Role / Timing Role: Dual-channel, rail-to-rail output buffer with 150-mA drive capability interfacing between precision current-sense amps and ADC inputs. Use Value: 110-MHz bandwidth rejects PWM switching noise (>20 MHz), while 2.2-nV/√Hz noise preserves <10-bit ENOB at 1-MSPS sampling. |
Use Scenario: Amplifying fast-rise-time trigger pulses (e.g., laser diode drivers, time-of-flight sensors) with minimal overshoot and ringing. IC Role / Device Role / Timing Role: Unity-gain stable current-feedback amplifier configured as a broadband pulse follower with 1-kΩ feedback. Use Value: 103-MHz bandwidth at ±5 V and 25-ns settling time support 10-ns pulse fidelity required in LIDAR and medical imaging systems. |
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 |
|---|---|---|---|
| THS3125ID | Higher slew rate (2000 V/µs), wider bandwidth (190 MHz), but higher quiescent current (7.5 mA/ch) and no shutdown function. | Better suited for >150-MHz RF IF stages; unsuitable where low-power standby is required. | Select THS3125ID only when bandwidth/slew rate margin outweighs power budget constraints and shutdown is unnecessary. |
| LMH6723MA/NOPB | Lower noise (1.6-nV/√Hz), lower supply current (4.2 mA/ch), but narrower bandwidth (900 MHz small-signal, yet only 65 MHz –3-dB at G = 2). | Preferred for low-noise, medium-bandwidth applications like medical sensor front-ends; insufficient for >100-MHz video distribution. | Choose LMH6723MA/NOPB when voltage noise dominates system SNR and bandwidth demand is ≤70 MHz. |
Compared with THS3115ID, THS3125ID trades power efficiency and shutdown capability for raw speed, while LMH6723MA/NOPB prioritizes noise performance at the expense of bandwidth - making THS3115ID the optimal balance for industrial video and piezo drive where 110-MHz bandwidth, 1550-V/µs slew rate, and 0.45-mA shutdown current are jointly required.
Availability
THS3115ID is available at Aetrix Electronics and suitable for video distribution systems, piezo actuator drivers, motor phase current sensing, and high-speed pulse amplification requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS3115ID 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 and embedded processing technologies, with decades of expertise in high-performance amplifiers and precision signal chain solutions.
The THS3115ID belongs to TI's THS31xx family of current-feedback amplifiers, designed specifically for demanding industrial and instrumentation applications requiring wide bandwidth, high output current, and robust thermal performance under continuous load.
FAQ
What is the maximum safe supply voltage for THS3115ID?
The absolute maximum supply voltage for THS3115ID is ±16.5 V (33 V total), but the recommended operating range is ±5 V to ±15 V. Operation at ±15 V delivers full specified performance including 110-MHz bandwidth and 1550-V/µs slew rate. Exceeding ±15 V risks exceeding junction temperature limits and invalidating parametric guarantees.
Does THS3115ID support single-supply operation?
Yes, THS3115ID supports single-supply operation from 10 V to 30 V. For proper DC biasing, the noninverting inputs must be referenced to mid-supply (e.g., VS/2) using precision resistive dividers or low-noise references. Output swing remains symmetric about mid-supply, enabling full dynamic range in systems lacking dual rails.
Is THS3115ID pin-compatible with THS3112ID?
Yes, THS3115ID and THS3112ID share identical SOIC-8 (D) packaging and pinout - both feature OUT1, OUT2, IN1–, IN2–, IN1+, IN2+, VCC–, and VCC+ on pins 1–8 respectively. However, THS3112ID lacks shutdown functionality and exhibits slightly lower slew rate (1300 V/µs vs 1550 V/µs) and bandwidth (103 MHz vs 110 MHz) at ±5 V.
What feedback resistor value is recommended for G = 2 with THS3115ID?
Texas Instruments specifies 750 Ω for RF when configuring THS3115ID for G = 2 in noninverting mode (RG = 750 Ω). This value balances bandwidth (110 MHz), stability (minimal peaking), and noise gain. Deviating significantly - e.g., using 1 kΩ - reduces bandwidth to ~95 MHz and increases susceptibility to oscillation with capacitive loads.
Can THS3115ID drive a 50-Ω load directly?
Yes, THS3115ID is characterized driving 50-Ω and 100-Ω loads. At ±15 V, it delivers 25-VPP into 100 Ω and maintains >175 mA output current into 25 Ω - sufficient for direct 50-Ω termination. For sustained 50-Ω drive, ensure PCB layout includes thermal vias to inner ground planes and local 10-µF tantalum + 0.1-µF ceramic decoupling at VCC+ and VCC– pins.
THS3115ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 14-SOIC
THS3115ID FAQ
1.How can I place an order for THS3115ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3115ID 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 THS3115ID reliable?
The price and inventory of THS3115ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3115ID is usually 5 days.
3.What payment methods are accepted for THS3115ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3115ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3115ID?
THS3115ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3115ID 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 THS3115ID?
For technical support, including THS3115ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3115ID requirements.
6.How does Aetrix verify that THS3115ID is sourced from the original manufacturer or authorized distributors?
All THS3115ID 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 THS3115ID meets industry standards.
7.What is the process for return or replacement of THS3115ID?
All THS3115ID units undergo pre-shipment inspection (PSI). If there is an issue with THS3115ID, 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 THS3115ID part is unused and in its original packaging.
Return procedure for THS3115ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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