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Texas Instruments THS4601ID
- Part No.:
- THS4601ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4601ID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,887
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Product details
Overview
THS4601ID from Texas Instruments is a high-speed FET-input operational amplifier designed for wideband transimpedance gain stages, photodiode amplification, and high-impedance buffering. It delivers 180 MHz gain-bandwidth product, 100 V/µs slew rate, ±15 V supply operation, 5.4 nV/√Hz input voltage noise, and 100 pA maximum input bias current - enabling low-noise amplification of weak current signals in optical and test systems.
For engineers reviewing the THS4601ID datasheet, THS4601ID pinout, THS4601ID application, or THS4601ID equivalent, this page provides verified technical context, package-specific terminal functions, real-world application mappings, and validated alternative options for transimpedance, high-speed buffering, and precision analog signal conditioning designs.
Technical Context
The THS4601ID operates as a unity-gain stable, voltage-feedback op amp with FET input stage, optimized for high-frequency transimpedance configurations where input bias current and input capacitance critically impact stability and bandwidth. Its differential input impedance (10⁹ Ω || 3.5 pF) and common-mode input range (±13 V at ±15 V supplies) support direct interfacing with photodiodes and DAC outputs without DC error degradation.
It features rail-to-rail output swing capability (±12.8 V min into 1 kΩ at ±15 V), low closed-loop output impedance (0.1 Ω at 1 MHz), and robust power supply rejection (115 dB PSRR at 25°C), making it suitable for mixed-signal systems requiring dynamic range preservation across varying supply conditions and temperature extremes (−40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 180 MHz - enables simultaneous high transimpedance gain (e.g., 100 kΩ) and >3 MHz large-signal bandwidth at ±15 V supplies. |
| Slew rate | 100 V/µs - supports fast settling (135 ns to 0.1%) for 5 V step outputs in high-speed pulse and video applications. |
| Input voltage noise | 5.4 nV/√Hz - ensures minimal SNR degradation when amplifying sub-microvolt-level photodiode currents. |
| Max input bias current | 100 pA at 25°C - reduces DC error and drift in high-impedance sensor interfaces like photodiodes and piezoelectric elements. |
| Supply voltage range | ±5 V to ±15 V - accommodates both low-power portable instrumentation and high-dynamic-range industrial test equipment. |
| Operating temperature | −40°C to +85°C - qualified for automotive under-hood, industrial control, and outdoor optical sensing environments. |
| Input impedance | 10⁹ Ω || 6.5 pF (common-mode) - preserves signal integrity in high-Z source applications without loading effects. |
Pinout & Package
THS4601ID is housed in an 8-pin SOIC surface-mount package (package designator 8D), with PowerPAD™ not included (distinct from THS4601IDDA). The device has three no-connect (NC) pins, supporting simplified PCB layout and noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (NC) | No internal connection | Unused pins; must remain unconnected to avoid parasitic coupling or thermal stress in high-frequency layouts. |
| 2 (IN−) | Inverting input | Primary node for transimpedance feedback networks; low input capacitance (3.5 pF) minimizes phase lag with photodiode capacitance. |
| 3 (IN+) | Noninverting input | DC bias reference point; high common-mode impedance allows precise offset control via external resistor networks. |
| 4 (VS−) | Negative power supply | Accepts −16.5 V absolute max; supports dual-supply operation essential for bipolar signal handling in test equipment. |
| 6 (OUT) | Amplifier output | Capable of ±12.8 V swing into 1 kΩ; low 0.1 Ω closed-loop impedance ensures drive capability into reactive loads. |
| 7 (VS+) | Positive power supply | Accepts +16.5 V absolute max; enables full-scale output swing required in wide-dynamic-range optical receivers. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Guaranteed stable with gain ≥ 1, eliminating need for external compensation in buffer and gain-of-1 transimpedance circuits. |
| High input impedance | 10⁹ Ω differential and common-mode input resistance minimizes loading on high-Z sources like photodiodes and MEMS sensors. |
| Low input current noise | 5.5 fA/√Hz - critical for preserving SNR in femtoampere-level current measurements typical in spectroscopy and particle detection. |
| Wide supply range | Operates from ±5 V to ±15 V - simplifies system-level power architecture by supporting both low-voltage portable and high-voltage lab-grade designs. |
| Thermal performance | θJA = 170°C/W (SOIC-8) - enables reliable operation up to +85°C ambient without forced cooling in compact enclosures. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying low-current output from fast-response silicon photodiodes in fiber-optic receivers and laser rangefinders. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal phase distortion and peaking. Use Value: Achieves 4 MHz −3 dB bandwidth with 100 kΩ RF and 18 pF diode capacitance (per Fig. 1), enabling accurate time-of-flight measurement. |
Use Scenario: Converting DAC output current to high-fidelity voltage in automated test equipment (ATE) waveform generators. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with low offset drift and high slew rate for fast settling. Use Value: Delivers <135 ns 0.1% settling time for 5 V steps, supporting >5 MSPS update rates in high-speed arbitrary waveform generation. |
| Test and Measurement Systems | Active Filtering |
|
Use Scenario: Front-end signal conditioning in oscilloscope vertical amplifiers and spectrum analyzer preselectors. IC Role / Device Role / Timing Role: High-Z, low-noise buffer and gain stage preserving signal fidelity up to 100 MHz. Use Value: Maintains −77 dBc 2nd harmonic distortion at 1 MHz (RL = 1 kΩ), ensuring accurate spectral analysis of complex waveforms. |
Use Scenario: Implementing 4th-order active bandpass filters in medical ultrasound beamforming and communications IF stages. IC Role / Device Role / Timing Role: Low-distortion, high-slew-rate op amp in multiple feedback (MFB) and state-variable topologies. Use Value: Supports filter Q > 20 with <0.08° differential phase error (NTSC/PAL), preserving timing integrity in video and imaging pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA637BM | Higher slew rate (135 V/µs) but gain-stable only at G ≥ +5; narrower GBW (80 MHz); lower input bias current (10 pA typ). | Better for fixed-gain ≥5 high-speed buffers; unsuitable for unity-gain transimpedance or variable-gain photodiode amps. | Select OPA637BM only when gain ≥5 is fixed and ultra-low IIB outweighs need for unity-gain stability. |
| OPA655U | Higher GBW (400 MHz) and slew rate (290 V/µs), but limited to ±5 V supplies; higher input voltage noise (6 nV/√Hz). | Ideal for low-voltage, ultra-wideband RF/IF gain blocks; cannot replace THS4601ID in ±12 V or ±15 V industrial/test systems. | Choose OPA655U for battery-powered or 5 V-only systems needing >100 MHz small-signal bandwidth; avoid where ±15 V rails exist. |
Compared with OPA637BM and OPA655U, THS4601ID uniquely combines unity-gain stability, ±15 V operation, and sub-100 pA input bias current - making it the only viable option for wide-supply, low-noise, unity-gain transimpedance designs in optical sensing and precision instrumentation.
Availability
THS4601ID is available at Aetrix Electronics and suitable for wideband photodiode amplification, high-speed transimpedance gain stages, and active filtering applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS4601ID 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 op amps and precision signal chain solutions.
The THS4601ID belongs to TI's high-speed FET-input op amp product line, engineered specifically for transimpedance amplification, optical sensing, and wideband analog signal conditioning in test, medical, and industrial systems.
FAQ
What is the operating temperature range for THS4601ID?
The THS4601ID is rated for operation from −40°C to +85°C, matching the "I" suffix industrial temperature grade. This range is confirmed in the PACKAGE AND ORDERING INFORMATION table (page 2 of SLOS388B), where THS4601ID is explicitly listed with −40°C to 85°C specification. The device maintains specified AC and DC performance across this full range, including input offset voltage ≤5.0 mV and quiescent current ≤12.0 mA max.
Does THS4601ID support ±5 V supply operation?
Yes, THS4601ID fully supports ±5 V supply operation, as verified in Section 5 of the datasheet ("electrical specifications: VS = ±5 V"). At ±5 V, it retains 180 MHz gain-bandwidth product, 100 V/µs slew rate, and 5.4 nV/√Hz input voltage noise. Output swing is reduced to ±2.9 V min into 1 kΩ, and large-signal bandwidth remains 6 MHz at G = +5 - making THS4601ID suitable for low-voltage portable instrumentation without sacrificing speed or noise performance.
Is THS4601ID pin-compatible with THS4601CD?
Yes, THS4601ID and THS4601CD share identical SOIC-8 (8D) package footprints and pinout, differing only in temperature grade (−40°C to +85°C vs. 0°C to +70°C) and marking ("4601I" vs. "4601C"). Both have NC pins at 1/5/8, IN− at pin 2, IN+ at pin 3, VS− at pin 4, OUT at pin 6, and VS+ at pin 7. No PCB redesign is needed when upgrading from CD to ID for extended temperature deployment.
What is the maximum input bias current specification for THS4601ID?
The maximum input bias current for THS4601ID is 1100 pA over the full −40°C to +85°C operating range, as specified in the "Input bias current, IIB" row of the electrical specifications table (page 3, SLOS388B). At 25°C, typical IIB is 30 pA, and the 25°C maximum is 100 pA. This low bias current is critical for minimizing DC error in high-impedance transimpedance applications such as photodiode amplification.
Can THS4601ID be used in unity-gain stable configurations?
Yes, THS4601ID is explicitly specified as unity-gain stable per the FEATURES section and confirmed in the DESCRIPTION: "Unity Gain Stable". This allows direct use in voltage follower, transimpedance (G = 1), and active filter configurations without external compensation. Stability is maintained across all supply voltages (±5 V to ±15 V) and load conditions up to 1 kΩ, as validated by open-loop gain/phase plots (Figure 8) showing >45° phase margin at unity gain.
THS4601ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 100V/µs
- Gain Bandwidth Product:
- 180 MHz
- -3db Bandwidth:
- 440 MHz
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 10mA
- Current - Output / Channel:
- 80 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
THS4601ID FAQ
1.How can I place an order for THS4601ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4601ID 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 THS4601ID reliable?
The price and inventory of THS4601ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4601ID is usually 5 days.
3.What payment methods are accepted for THS4601ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4601ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4601ID?
THS4601ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4601ID 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 THS4601ID?
For technical support, including THS4601ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4601ID requirements.
6.How does Aetrix verify that THS4601ID is sourced from the original manufacturer or authorized distributors?
All THS4601ID 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 THS4601ID meets industry standards.
7.What is the process for return or replacement of THS4601ID?
All THS4601ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4601ID, 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 THS4601ID part is unused and in its original packaging.
Return procedure for THS4601ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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