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Texas Instruments THS4601CDDA
- Part No.:
- THS4601CDDA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4601CDDA.pdf
- Description:
- IC OPAMP GP 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
THS4601CDDA from Texas Instruments is a high-speed FET-input operational amplifier optimized for wideband transimpedance gain stages, photodiode amplification, and high-impedance signal conditioning. 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 simultaneous high gain, wide bandwidth, and low-noise amplification of weak current-mode signals in optical sensing systems.
For engineers reviewing the THS4601CDDA datasheet, THS4601CDDA pinout, THS4601CDDA application, or THS4601CDDA equivalent, key selection criteria include its FET-input architecture for ultra-low bias current, PowerPAD-enhanced thermal performance (θJA = 66.6°C/W), SOIC-8 package with exposed thermal pad, unity-gain stability, and suitability for precision wideband current-to-voltage conversion where input capacitance and dynamic range critically impact bandwidth and SNR.
Technical Context
The THS4601CDDA employs a JFET-input stage to achieve 109 Ω || 10 pF input impedance and sub-100 pA input bias current, minimizing error in high-impedance transimpedance configurations. Its 180 MHz gain-bandwidth product supports stable operation at unity gain while delivering >95 MHz small-signal bandwidth at G = +2 and >36 MHz at G = +5 under ±15 V supplies.
Designed for photodiode interfacing, it features low 5.4 nV/√Hz voltage noise and 5.5 fA/√Hz current noise, enabling high signal-to-noise ratio amplification of nanoamp-level photocurrents. The device maintains 12.8 V to –13.4 V output swing into 1 kΩ and exhibits <7 ns rise/fall time, supporting fast pulse response in test & measurement and optical monitoring systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 180 MHz - enables stable transimpedance gains up to 100× with multi-MHz bandwidth when driving capacitive sources like photodiodes. |
| Slew Rate | 100 V/µs - supports clean amplification of fast-rising optical pulses without slew-induced distortion. |
| Input Bias Current | Max 100 pA at 25°C - minimizes DC error and drift in high-impedance feedback networks (e.g., ≥100 kΩ RF). |
| Input Voltage Noise | 5.4 nV/√Hz - preserves SNR when amplifying low-level photocurrents converted via large-value feedback resistors. |
| Supply Voltage Range | ±5 V to ±15 V - provides design flexibility for low-power portable systems or high-dynamic-range industrial instrumentation. |
| Output Swing (RL = 1 kΩ) | ±12.8 V min at ±15 V supply - delivers >25 Vpp linear output for wide dynamic range signal capture. |
| Thermal Resistance (θJA) | 66.6°C/W - PowerPAD-enhanced SOIC-8 package enables reliable operation at full quiescent current (12 mA max) without external heatsinking. |
Pinout & Package
THS4601CDDA uses an 8-pin SOIC surface-mount package with PowerPAD™ thermal enhancement (package designation 8DDA). The exposed thermal pad on the underside improves heat dissipation and must be soldered to a PCB thermal plane for optimal junction temperature control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (NC) | No internal connection | Must remain unconnected; no routing or grounding required - floating pins reduce parasitic coupling risk. |
| 2 (IN−) | Inverting input | Primary node for transimpedance feedback; low input capacitance (3.5 pF differential) minimizes peaking with photodiode capacitance. |
| 3 (IN+) | Noninverting input | High-impedance reference node; typically grounded or biased to set common-mode operating point. |
| 4 (VS−) | Negative power supply | Accepts −16.5 V absolute max; connects to system ground or negative rail - critical for symmetric output swing. |
| 6 (OUT) | Amplifier output | Capable of sourcing/sinking ≥50 mA; drives 1 kΩ load to ±12.8 V with <0.1% settling in 135 ns. |
| 7 (VS+) | Positive power supply | Accepts +16.5 V absolute max; decoupling near pin essential to maintain 100 V/µs slew rate integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable FET-input architecture | Enables direct use in G = +1 transimpedance circuits without external compensation, reducing component count and layout sensitivity. |
| Low input voltage & current noise | 5.4 nV/√Hz + 5.5 fA/√Hz allows detection of sub-nA photocurrents with minimal added noise floor degradation. |
| High common-mode input range | ±13.0 V at ±15 V supply - accommodates wide photodiode reverse-bias voltages while maintaining linear operation. |
| PowerPAD thermal package (8DDA) | 66.6°C/W θJA vs. 170°C/W for standard SOIC-8 - enables sustained 12 mA quiescent current in compact layouts without thermal derating. |
| 0.1 dB flatness bandwidth | 5 MHz at G = +2 - ensures amplitude fidelity across video and medium-speed data acquisition bandwidths. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying nanoamp-level photocurrent from high-speed silicon or InGaAs photodiodes in fiber-optic receivers or laser rangefinders. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage with minimal added noise and phase shift. Use Value: 180 MHz GBW and 100 pA IIB enable >3 MHz bandwidth with 100 kΩ feedback resistor and 18 pF diode capacitance - verified in Figure 1. |
Use Scenario: Signal conditioning front-end in automated test equipment (ATE) for fast current-source DUTs. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with fast settling (<135 ns to 0.1%) for pulsed current measurements. Use Value: 100 V/µs slew rate and 7 ns rise time support accurate digitization of µs-scale current pulses without slew distortion. |
| Test and Measurement Systems | Active Filtering |
|
Use Scenario: Input buffer and gain stage in oscilloscope front-ends or spectrum analyzer IF sections requiring wide dynamic range. IC Role / Device Role / Timing Role: High-Z, low-noise buffer isolating sensitive measurement nodes from downstream loading effects. Use Value: 109 Ω || 10 pF input impedance prevents signal attenuation and phase error in high-frequency passive probe interfaces. |
Use Scenario: Building 2nd- to 4th-order active filters for anti-aliasing or channel equalization in communication basebands. IC Role / Device Role / Timing Role: High-speed op-amp core in Sallen-Key or MFB filter topologies demanding low distortion and wide bandwidth. Use Value: −77 dBc 2nd harmonic at 1 MHz (RL = 1 kΩ) ensures minimal intermodulation distortion in multi-tone filter responses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed FET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA655 | Higher 400 MHz GBW but narrower ±5 V supply range; 6 nV/√Hz noise; not unity-gain stable. | Better suited for fixed-gain ≥+5 RF applications needing >100 MHz bandwidth; unsuitable for G = +1 photodiode amps without compensation. | Select OPA655 only when gain ≥+5 is fixed and supply is limited to ±5 V; THS4601CDDA remains preferred for variable-gain, wide-supply, unity-stable designs. |
| OPA637 | 80 MHz GBW, 135 V/µs slew, ±15 V supply; 4.5 nV/√Hz noise; stable only at G ≥ +5. | Lower bandwidth limits transimpedance gain-bandwidth tradeoff; requires minimum +5 gain, restricting low-gain photodiode configurations. | Choose OPA637 for high-slew, medium-bandwidth applications where gain ≥+5 is acceptable and lower noise is prioritized over unity stability. |
Compared with OPA655 and OPA637, THS4601CDDA uniquely combines unity-gain stability, ±15 V operation, and 180 MHz GBW - making it the only option among the three capable of robust, uncompensated G = +1 transimpedance amplification with photodiodes across industrial temperature ranges.
Availability
THS4601CDDA is available at Aetrix Electronics and suitable for wideband photodiode amplifiers, high-speed test and measurement instrumentation, and active filtering applications requiring stable component supply, thermal reliability, and consistent parametric performance across production lots.
Supply support for THS4601CDDA 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 THS4601CDDA belongs to TI's high-speed FET-input op-amp family, engineered specifically for wideband transimpedance amplification, optical sensing, and low-noise current-to-voltage conversion in demanding instrumentation and communications systems.
FAQ
What is the maximum recommended supply voltage for THS4601CDDA?
The absolute maximum supply voltage for THS4601CDDA is ±16.5 V per the datasheet's Absolute Maximum Ratings table. For reliable long-term operation, TI specifies ±15 V as the recommended operating voltage. Exceeding ±16.5 V risks permanent damage, and operation above ±15 V may degrade parametric performance or accelerate aging. Always use proper decoupling and observe thermal limits when operating near maximum ratings.
Does THS4601CDDA require external compensation for unity-gain stability?
No, THS4601CDDA is explicitly specified as unity-gain stable in its datasheet description and electrical specifications. It can be used directly in G = +1 configurations - such as basic transimpedance amplifiers - without external compensation components. This eliminates design complexity and layout sensitivity associated with stability tuning, making it ideal for photodiode interface circuits where simplicity and repeatability are critical.
How does the PowerPAD package of THS4601CDDA improve thermal performance?
The THS4601CDDA's SOIC-8 with PowerPAD package achieves θJA = 66.6°C/W - significantly lower than 170°C/W for the standard SOIC-8 (THS4601CD). This 61% reduction in thermal resistance results from the exposed copper thermal pad on the bottom of the package, which must be soldered to a PCB copper pour. It enables higher continuous power dissipation (up to 12 mA quiescent current) without exceeding 150°C junction temperature, improving reliability in compact or thermally constrained layouts.
What is the typical input bias current of THS4601CDDA at room temperature?
The typical input bias current of THS4601CDDA at 25°C is 30 pA under ±15 V supply conditions, with a maximum rated value of 100 pA across the 0°C to 70°C operating range. This ultra-low bias current is enabled by its JFET input stage and is critical for minimizing DC error in high-value feedback networks (e.g., 100 kΩ–1 MΩ) used in photodiode and current-DAC applications.
Can THS4601CDDA drive a 50 Ω load effectively?
THS4601CDDA is not optimized for direct 50 Ω driving: its output stage is rated for ≥50 mA sourcing/sinking into 20 Ω, but driving 50 Ω continuously risks thermal overload and output swing compression. For 50 Ω systems, use a series 45 Ω resistor to isolate the op-amp and match to 50 Ω - preserving linearity and preventing excessive current draw. The device's 0.1 Ω closed-loop output impedance at 1 MHz confirms excellent small-signal drive capability into higher impedances.
THS4601CDDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
THS4601CDDA FAQ
1.How can I place an order for THS4601CDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4601CDDA 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 THS4601CDDA reliable?
The price and inventory of THS4601CDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4601CDDA is usually 5 days.
3.What payment methods are accepted for THS4601CDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4601CDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4601CDDA?
THS4601CDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4601CDDA 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 THS4601CDDA?
For technical support, including THS4601CDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4601CDDA requirements.
6.How does Aetrix verify that THS4601CDDA is sourced from the original manufacturer or authorized distributors?
All THS4601CDDA 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 THS4601CDDA meets industry standards.
7.What is the process for return or replacement of THS4601CDDA?
All THS4601CDDA units undergo pre-shipment inspection (PSI). If there is an issue with THS4601CDDA, 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 THS4601CDDA part is unused and in its original packaging.
Return procedure for THS4601CDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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