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Texas Instruments THS4601CDDAR
- Part No.:
- THS4601CDDAR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4601CDDAR.pdf
- Description:
- IC OPAMP GP 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,763
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Product details
Overview
THS4601CDDAR 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 optical sensing and test equipment.
For engineers reviewing the THS4601CDDAR datasheet, THS4601CDDAR pinout, THS4601CDDAR application, or THS4601CDDAR equivalent, key selection criteria include transimpedance stability with capacitive sources (e.g., photodiodes up to 220 pF), output swing capability (±12.8 V @ ±15 V supplies), thermal performance (θJA = 66.6°C/W with PowerPAD™), and unity-gain stability without external compensation.
Technical Context
The THS4601CDDAR employs a JFET-input stage delivering ultra-high differential input impedance (10⁹ Ω || 3.5 pF) and minimal input bias current drift (50 pA/°C), critical for precision current-to-voltage conversion. Its internal compensation ensures unity-gain stability while supporting large-signal bandwidths up to 6 MHz (G = +5, VO = 5 Vpp, ±5 V supplies) and 3 MHz (G = +5, VO = 10 Vpp, ±15 V supplies).
Designed for demanding analog front-ends, it integrates low harmonic distortion (−96 dBc 3rd harmonic, RL = 1 kΩ), high PSRR (115 dB at ±15 V), and robust output drive (±80 mA sourcing/sinking into 20 Ω), making it suitable for driving coaxial cables or ADC inputs in high-fidelity measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 180 MHz - enables stable transimpedance gains ≥100 kΩ with >3 MHz bandwidth when compensating for photodiode capacitance up to 47 pF. |
| Slew rate | 100 V/µs - supports clean 10 Vpp output steps at 5 MHz without slewing distortion in high-speed integrators or DAC buffers. |
| Input voltage noise | 5.4 nV/√Hz - preserves SNR in low-level photodiode current amplification where signal currents are sub-nA. |
| Input bias current | Max 100 pA at 25°C - minimizes DC error in high-impedance transimpedance circuits using feedback resistors ≥1 MΩ. |
| 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 portable instrumentation. |
| Thermal resistance θJA | 66.6°C/W (SOIC-8 with PowerPAD™) - enables sustained 10 mA quiescent current operation at ambient ≤70°C without heatsinking. |
| Common-mode input range | ±13.0 V (±15 V supplies) - accommodates biased photodiode configurations with −VBias up to −13 V while maintaining linear operation. |
Pinout & Package
THS4601CDDAR uses an 8-pin SOIC package with PowerPAD™ thermal enhancement (package designation 8DDA). The exposed thermal pad must be soldered to PCB copper for optimal thermal performance (θJA = 66.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (NC) | No internal connection | Must remain unconnected; no routing or grounding required - avoids parasitic coupling in high-speed layouts. |
| 2 (IN−) | Inverting input | Primary node for transimpedance feedback; requires low-parasitic layout and guard ringing to maintain stability with >100 pF source capacitance. |
| 3 (IN+) | Noninverting input | DC-biased to establish common-mode operating point; typically tied to reference voltage or grounded via low-inductance path. |
| 4 (VS−) | Negative power supply | Accepts −16.5 V absolute max; decoupling capacitor (≥0.1 µF ceramic + 10 µF tantalum) required within 5 mm for high-frequency PSRR. |
| 6 (OUT) | Amplifier output | Capable of ±80 mA drive into 20 Ω; requires series resistor (20–50 Ω) when driving long traces or capacitive loads >100 pF. |
| 7 (VS+) | Positive power supply | Accepts +16.5 V absolute max; symmetric decoupling to VS− essential for balanced slew rate and distortion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Eliminates need for external compensation components in G = +1 to +5 configurations, reducing BOM count and layout sensitivity. |
| FET-input stage | 10⁹ Ω || 3.5 pF input impedance enables accurate amplification of high-Z sources (e.g., piezoelectric sensors, photodiodes) without loading error. |
| Low input current noise | 5.5 fA/√Hz complements ultra-low IIB to minimize integrated noise in transimpedance applications with RF ≥ 100 kΩ. |
| High PSRR & CMRR | 115 dB PSRR and 110 dB CMRR at 25°C ensure rejection of supply ripple and common-mode interference in noisy industrial environments. |
| PowerPAD™ thermal package | 66.6°C/W θJA improves reliability over standard SOIC-8 (170°C/W) - critical for continuous high-output-swing operation in test equipment. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying nanoampere-level photocurrent from fast silicon or InGaAs photodiodes in fiber-optic receivers or laser rangefinders. IC Role / Device Role / Timing Role: Transimpedance amplifier converting diode current to voltage with bandwidth up to 4 MHz (100 kΩ RF, 18 pF diode capacitance). Use Value: 180 MHz GBP and 100 pA IIB enable >100 dB dynamic range while maintaining flat frequency response up to 3.3 MHz per Table 1. |
Use Scenario: Converting DAC output current to precise voltage in high-speed arbitrary waveform generators or RF calibration systems. IC Role / Device Role / Timing Role: Current-DAC output buffer with low distortion (<−94 dBc 3rd harmonic) and 100 V/µs slew rate for 10 Vpp signals. Use Value: 5.4 nV/√Hz noise and ±12.8 V output swing preserve signal fidelity across 0.1–5 MHz bandwidth without clipping or added jitter. |
| Test and Measurement Systems | Active Filtering |
|
Use Scenario: Front-end gain block in oscilloscope channels or spectrum analyzer preamps requiring wideband, low-noise amplification. IC Role / Device Role / Timing Role: High-Z buffer and gain stage with 10⁹ Ω input impedance and 95 MHz small-signal bandwidth (G = +2). Use Value: 0.1 dB flatness to 5 MHz and −77 dBc 2nd harmonic (RL = 1 kΩ) ensure amplitude accuracy and minimal harmonic contamination in calibrated instruments. |
Use Scenario: Implementing 4th-order active low-pass or band-pass filters in medical imaging or communications baseband processing. IC Role / Device Role / Timing Role: Unity-gain stable op-amp in Sallen-Key or multiple-feedback topologies with programmable cutoff up to 100 MHz. Use Value: 180 MHz GBP allows filter Q-factor control up to 20 MHz without gain peaking; 100 V/µs SR prevents transient overshoot during step response. |
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 GBP (400 MHz) but narrower supply range (±5 V only); 290 V/µs slew rate; 6 nV/√Hz noise. | Better for ultra-wideband AC-coupled applications <100 MHz; unsuitable for ±12 V output swing requirements. | Select OPA655 when bandwidth >100 MHz is mandatory and rail voltage ≤±5 V; avoid when high-voltage output swing or photodiode biasing is needed. |
| OPA637 | Lower GBP (80 MHz) but higher slew rate (135 V/µs); same ±15 V supply; 4.5 nV/√Hz noise; gain-of-5 stable only. | Optimized for fixed-gain ≥+5 precision amplification; not unity-gain stable - requires external compensation for transimpedance use. | Select OPA637 for non-unity-gain buffered instrumentation where lower noise and higher slew outweigh bandwidth loss; verify stability with feedback network. |
Compared with OPA655 and OPA637, THS4601CDDAR uniquely balances 180 MHz bandwidth, ±15 V operation, unity-gain stability, and ultra-low input bias current - making it the only option among the three capable of direct photodiode transimpedance implementation without gain constraints or rail limitations.
Availability
THS4601CDDAR is available at Aetrix Electronics and suitable for optical sensing, automated test equipment, and high-precision data acquisition systems requiring stable component supply, consistent thermal performance, and long-term manufacturability.
Supply support for THS4601CDDAR 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 THS4601CDDAR belongs to TI's high-speed FET-input op-amp family, engineered specifically for wideband transimpedance amplification, photodiode interfacing, and low-noise, high-dynamic-range analog front-ends in test, medical, and optical systems.
FAQ
What is the maximum photodiode capacitance supported by THS4601CDDAR in a 100 kΩ transimpedance configuration?
Per TI's SLOS388B datasheet Table 1, THS4601CDDAR achieves a −3 dB bandwidth of 3.3 MHz with 100 kΩ feedback and 18 pF total source capacitance (including diode, input, and parasitic capacitance). At 47 pF, bandwidth drops to 2.8 MHz; at 100 pF, it falls to 1.3 MHz. Stability is maintained across this range using empirically tuned feedback capacitors (e.g., 0.6 pF for 18 pF, 1.5 pF for 100 pF), confirming THS4601CDDAR's suitability for photodiodes with junction capacitance up to ~100 pF in production designs.
Does THS4601CDDAR require external compensation for unity-gain operation?
No, THS4601CDDAR is internally compensated for unity-gain stability. The datasheet explicitly states "Unity Gain Stable" in FEATURES and confirms stable small-signal unity-gain frequency response in Figure 2 (−3 dB at ~440 MHz). This eliminates the need for external compensation networks in G = +1 configurations, simplifying layout and improving repeatability in photodiode amplifier and buffer applications - a key differentiator versus gain-stable-only op-amps like OPA637.
How does the PowerPAD™ package of THS4601CDDAR improve thermal performance versus standard SOIC-8?
THS4601CDDAR's 8DDA package incorporates an exposed thermal pad that, when soldered to a PCB copper pour, reduces junction-to-ambient thermal resistance from 170°C/W (standard 8D SOIC) to 66.6°C/W. This 61% improvement allows continuous operation at full ±15 V supplies and 10 mA quiescent current with ambient temperatures up to 70°C without forced air or heatsinks - critical for compact test equipment and high-density instrumentation where thermal headroom is constrained.
Can THS4601CDDAR drive a 50 Ω coaxial cable directly?
THS4601CDDAR can drive 50 Ω loads with ±80 mA sourcing/sinking capability, but direct connection risks instability and degraded bandwidth due to cable capacitance and reflections. TI recommends using a series resistor (typically 20–50 Ω) placed adjacent to the OUT pin to isolate the op-amp from the cable's reactive load. This maintains phase margin and preserves the 95 MHz small-signal bandwidth (G = +2) while ensuring clean 10 Vpp signal transmission - a practice validated in TI's application notes for high-speed line driving.
What is the input common-mode voltage range of THS4601CDDAR at ±15 V supplies?
At ±15 V supplies, THS4601CDDAR's specified common-mode input range is ±13.0 V minimum (12.6 V to −12.0 V over 0°C to 70°C). This allows direct interfacing with photodiodes biased at −13 V (e.g., reverse-biased InGaAs detectors) while keeping the IN+ and IN− nodes within linear operating region. The 2 V headroom below rails ensures low distortion and avoids input stage saturation, a critical requirement for maintaining accuracy in high-gain transimpedance configurations.
THS4601CDDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
THS4601CDDAR FAQ
1.How can I place an order for THS4601CDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4601CDDAR 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 THS4601CDDAR reliable?
The price and inventory of THS4601CDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4601CDDAR is usually 5 days.
3.What payment methods are accepted for THS4601CDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4601CDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4601CDDAR?
THS4601CDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4601CDDAR 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 THS4601CDDAR?
For technical support, including THS4601CDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4601CDDAR requirements.
6.How does Aetrix verify that THS4601CDDAR is sourced from the original manufacturer or authorized distributors?
All THS4601CDDAR 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 THS4601CDDAR meets industry standards.
7.What is the process for return or replacement of THS4601CDDAR?
All THS4601CDDAR units undergo pre-shipment inspection (PSI). If there is an issue with THS4601CDDAR, 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 THS4601CDDAR part is unused and in its original packaging.
Return procedure for THS4601CDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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