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Texas Instruments THS4601IDDA
- Part No.:
- THS4601IDDA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4601IDDA.pdf
- Description:
- IC OPAMP GP 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,333
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Product details
Overview
THS4601IDDA 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 low-noise amplification of weak, high-frequency current signals in precision optical and test systems.
For engineers reviewing the THS4601IDDA datasheet, THS4601IDDA pinout, THS4601IDDA application, or THS4601IDDA equivalent, this page provides verified technical context, package-specific thermal performance (θJA = 67 °C/W), transimpedance design guidance, real-world bandwidth vs. gain tradeoffs, and validated alternative options for photodiode amplifier and high-speed buffer implementations.
Technical Context
The THS4601IDDA employs a JFET-input stage to achieve ultra-low input bias current (≤100 pA) and high differential input impedance (10⁹ Ω || 3.5 pF), minimizing loading errors in capacitive current-source interfaces like photodiodes. Its unity-gain stable architecture supports configurable closed-loop gains from +1 to +100 without external compensation.
Designed for ±5 V to ±15 V dual-supply operation, it maintains 12.1 V to –12.8 V output swing into 1 kΩ at –40°C to +85°C, with 0.1 Ω closed-loop output impedance at 1 MHz. Thermal performance is enhanced by the PowerPAD-equipped SOIC-8DDA package (θJA = 67 °C/W), critical for sustained high-output-swing operation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 180 MHz - enables simultaneous high transimpedance gain (e.g., 100 kΩ) and multi-MHz bandwidth in photodiode circuits. |
| Slew rate | 100 V/µs - supports clean 5 Vpp large-signal step response within 170 ns settling time (0.01%) at G = +5. |
| Input voltage noise | 5.4 nV/√Hz - preserves signal-to-noise ratio when amplifying sub-µA photodiode currents. |
| Input bias current | Max 100 pA at 25°C - minimizes DC error and drift in high-impedance transimpedance feedback networks. |
| Supply voltage range | ±5 V to ±15 V - allows flexible rail selection: ±15 V for maximum dynamic range (±12.8 V swing), ±5 V for low-power systems. |
| Operating temperature | –40°C to +85°C - qualified for industrial and instrumentation environments without derating. |
| Thermal resistance θJA | 67 °C/W (SOIC-8 with PowerPAD) - reduces junction temperature rise by >60% vs. standard SOIC-8 (170 °C/W), improving reliability under load. |
Pinout & Package
THS4601IDDA uses an 8-pin SOIC surface-mount package with PowerPAD™ thermal enhancement (package code 8DDA). The exposed thermal pad must be soldered to PCB copper for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (NC) | No internal connection | Must remain unconnected; no routing or grounding required. |
| 2 (IN−) | Inverting input | Primary node for transimpedance feedback; low input capacitance (3.5 pF) minimizes stability risk with photodiode capacitance. |
| 3 (IN+) | Noninverting input | DC bias reference point; typically tied to mid-supply or virtual ground in single-ended configurations. |
| 4 (VS−) | Negative power supply | Accepts –5 V to –16.5 V; requires local 0.1 µF bypass capacitor to ground. |
| 6 (OUT) | Amplifier output | Drives 1 kΩ loads with ±12.8 V swing (±15 V supplies); closed-loop ZO = 0.1 Ω at 1 MHz ensures minimal gain loss in active filters. |
| 7 (VS+) | Positive power supply | Accepts +5 V to +16.5 V; symmetric rail support enables true bipolar signal handling. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable FET-input architecture | Eliminates need for external compensation in G ≥ +1 configurations, simplifying layout for photodiode amp designs. |
| Low input current noise (5.5 fA/√Hz) | Reduces integrated noise floor in high-RF transimpedance stages, critical for detecting nanoamp-level optical signals. |
| High CMRR (90 dB min, –40°C to +85°C) | Maintains accuracy in noisy industrial environments where common-mode interference could corrupt low-level current measurements. |
| 0.1 dB flatness bandwidth (5 MHz at G = +2) | Ensures amplitude fidelity across video and intermediate-frequency bands without post-processing correction. |
| Differential gain/phase (0.02%/0.08°) | Meets broadcast-grade analog video linearity requirements for test equipment interfacing with NTSC/PAL sources. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying weak, fast current pulses from avalanche photodiodes in LIDAR receivers or optical time-domain reflectometers. IC Role / Device Role / Timing Role: Primary transimpedance gain element converting photocurrent to voltage with minimal phase distortion and peaking. Use Value: 180 MHz GBW and 100 pA IIB enable >3 MHz bandwidth with 1 MΩ RF and 18 pF diode capacitance - verified in TI's Figure 1 and Table 1. |
Use Scenario: Signal conditioning in automated test equipment (ATE) where DAC output currents require precise, high-bandwidth voltage conversion. IC Role / Device Role / Timing Role: Current-to-voltage converter buffering high-speed DAC outputs before analog multiplexing or digitization. Use Value: 100 V/µs slew rate and 170 ns 0.01% settling ensure <1 LSB error for 16-bit DACs operating at >1 MSPS update rates. |
| Test and Measurement Systems | High-Impedance Buffer |
|
Use Scenario: Front-end amplification in oscilloscope vertical sections or spectrum analyzer preselectors requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: High-fidelity gain block preserving signal integrity from DC to 100 MHz with <–77 dBc 2nd harmonic (RL = 1 kΩ). Use Value: 110 dB open-loop gain and 90 dB CMRR maintain accuracy despite ground loop noise in benchtop instruments. |
Use Scenario: Isolating high-impedance sensor nodes (e.g., pH electrodes, piezoresistive bridges) from downstream ADC input capacitance. IC Role / Device Role / Timing Role: Unity-gain voltage follower presenting >10⁹ Ω input impedance while driving 100 pF+ capacitive loads. Use Value: FET input eliminates bias current-induced offset drift, enabling stable DC-coupled measurement over hours-long acquisitions. |
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 GBW (400 MHz) but narrower supply range (±5 V only); 6 nV/√Hz noise; not rated for –40°C to +85°C. | Better suited for low-voltage, ultra-wideband RF IF amplification; unsuitable for ±12 V industrial rails or extended temperature operation. | Select OPA655 only if system operates at ±5 V and requires >200 MHz small-signal bandwidth - THS4601IDDA remains preferred for ±15 V and industrial temp range. |
| OPA637 | Lower GBW (80 MHz) but higher slew rate (135 V/µs); same ±15 V rating and –40°C to +85°C range; 4.5 nV/√Hz noise. | Optimized for high-slew, moderate-bandwidth applications like pulse amplification; less effective for high-RF transimpedance due to lower GBW. | Choose OPA637 when output transient fidelity dominates over transimpedance gain-bandwidth tradeoff - THS4601IDDA better balances both for photodiode use cases. |
Compared with OPA655 and OPA637, THS4601IDDA uniquely combines ±15 V operation, –40°C to +85°C qualification, 180 MHz GBW, and 100 pA IIB - making it the only option among the three capable of robust, high-gain transimpedance amplification across industrial temperature and supply ranges.
Availability
THS4601IDDA is available at Aetrix Electronics and suitable for photodiode amplifier modules, automated test equipment front-ends, and industrial optical sensor interfaces requiring stable component supply, long-term lifecycle support, and guaranteed thermal performance via PowerPAD packaging.
Supply support for THS4601IDDA 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 THS4601IDDA belongs to TI's high-speed FET-input op-amp product line, engineered specifically for wideband transimpedance amplification, photodiode interfacing, and high-impedance signal buffering in test, measurement, and optical sensing systems.
FAQ
What is the maximum recommended supply voltage for THS4601IDDA?
The absolute maximum supply voltage for THS4601IDDA is ±16.5 V per the datasheet's Absolute Maximum Ratings table. However, the specified operating range is ±5 V to ±15 V. Operating at ±16.5 V risks permanent damage; for reliable long-term use, stay within ±15 V. The THS4601IDDA delivers full-rated performance - including 12.1 V to –12.8 V output swing - at ±15 V across its full temperature range.
Does THS4601IDDA require external compensation for unity-gain operation?
No, THS4601IDDA is explicitly unity-gain stable per its datasheet description and electrical specifications. It can be configured as a voltage follower (G = +1) without any external compensation components. This is confirmed in the "DESCRIPTION" section and supported by measured small-signal frequency response data (Figure 2), which shows stable unity-gain behavior up to 440 MHz.
How does the PowerPAD package of THS4601IDDA improve thermal performance?
The SOIC-8DDA package integrates an exposed thermal pad (PowerPAD™) that, when soldered to a PCB copper pour, reduces junction-to-ambient thermal resistance to 67 °C/W - versus 170 °C/W for the standard SOIC-8 (8D) variant. This 60% reduction lowers steady-state junction temperature under load, directly improving long-term reliability and maintaining specification compliance during sustained high-output-swing operation.
Can THS4601IDDA drive a 50 Ω load effectively?
THS4601IDDA is not optimized for direct 50 Ω driving. Its typical sourcing/sinking current is –59 mA/+34 mA (min) into 20 Ω at –40°C to +85°C, and output swing degrades significantly below 100 Ω. For 50 Ω loads, use a dedicated line driver or add a discrete buffer stage. The THS4601IDDA's specified performance - including 0.1 dB flatness and harmonic distortion - is validated into 1 kΩ and 150 Ω loads, not 50 Ω.
What is the typical input capacitance of THS4601IDDA, and why does it matter in photodiode applications?
THS4601IDDA has a differential input capacitance of 3.5 pF and common-mode input capacitance of 6.5 pF (typical). In photodiode transimpedance circuits, total input capacitance - including diode capacitance (e.g., 18 pF), PCB parasitics, and amplifier input capacitance - determines stability and achievable bandwidth. Lower amplifier input capacitance (like THS4601IDDA's 3.5 pF) allows larger RF values and higher transimpedance gain before compensation becomes critical, as shown in TI's Table 1 and Figure 1.
THS4601IDDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (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-SO PowerPad
THS4601IDDA FAQ
1.How can I place an order for THS4601IDDA through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4601IDDA 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 THS4601IDDA reliable?
The price and inventory of THS4601IDDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4601IDDA is usually 5 days.
3.What payment methods are accepted for THS4601IDDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4601IDDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4601IDDA?
THS4601IDDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4601IDDA 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 THS4601IDDA?
For technical support, including THS4601IDDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4601IDDA requirements.
6.How does Aetrix verify that THS4601IDDA is sourced from the original manufacturer or authorized distributors?
All THS4601IDDA 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 THS4601IDDA meets industry standards.
7.What is the process for return or replacement of THS4601IDDA?
All THS4601IDDA units undergo pre-shipment inspection (PSI). If there is an issue with THS4601IDDA, 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 THS4601IDDA part is unused and in its original packaging.
Return procedure for THS4601IDDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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