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Texas Instruments THS4601CD
- Part No.:
- THS4601CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4601CD.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
THS4601CD 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 current signals in optical and test systems.
For engineers reviewing the THS4601CD datasheet, THS4601CD pinout, THS4601CD application, or THS4601CD equivalent, key selection criteria include transimpedance stability with capacitive sources (e.g., photodiodes up to 220 pF), DC precision under ±15 V rails, unity-gain stability, and SOIC-8 thermal performance (θJA = 170°C/W).
Technical Context
The THS4601CD 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 high-Z sensor interfaces. Its 180 MHz gain-bandwidth product supports stable operation at gains ≥ +10 while maintaining >5 MHz 0.1 dB flatness bandwidth at G = +2.
Designed for ±5 V to ±15 V dual-supply operation, it provides rail-to-rail output swing capability (±12.8 V min into 1 kΩ at ±15 V), low harmonic distortion (−77 dBc 2nd harmonic, RL = 1 kΩ), and robust power supply rejection (≥110 dB PSRR at 25°C), making it suitable for precision analog front-ends in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 180 MHz - enables stable transimpedance gain ≥100 kΩ with >3 MHz bandwidth when compensating photodiode capacitance up to 100 pF. |
| Slew rate | 100 V/µs - supports fast large-signal settling (135 ns to 0.1%) for pulse-shaped optical signals or DAC output buffering. |
| 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 - critical for minimizing offset error in high-impedance transimpedance circuits with RF ≥ 100 kΩ. |
| Supply voltage range | ±5 V to ±15 V - allows flexible system-level rail assignment and wide dynamic range output swing (±12.8 V min into 1 kΩ). |
| Unity-gain stability | Yes - eliminates need for external compensation in G = +1 configurations such as active filtering or buffer applications. |
| Common-mode input range | ±13.0 V (at ±15 V supplies) - accommodates wide-swing input signals without clipping in single-ended sensor interfaces. |
Pinout & Package
THS4601CD is housed in an 8-pin SOIC surface-mount package (Package Designator: 8D), with exposed pad not connected (non-PowerPAD variant). Thermal resistance θJA is 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (NC) | No internal connection | Must be left unconnected; no routing or grounding required - avoids parasitic coupling in high-frequency layouts. |
| 2 (IN−) | Inverting input | Primary node for transimpedance feedback; requires low-parasitic layout to maintain stability with CF compensation. |
| 3 (IN+) | Noninverting input | DC-biased reference point; typically grounded or set to mid-supply for single-ended operation. |
| 4 (VS−) | Negative power supply | Connects to −15 V (or −5 V); decoupling capacitor (0.1 µF) required within 1 cm for AC stability. |
| 6 (OUT) | Amplifier output | Drives 1 kΩ loads with ±12.8 V swing; layout must minimize trace inductance to preserve 100 V/µs slew performance. |
| 7 (VS+) | Positive power supply | Connects to +15 V (or +5 V); paired decoupling with VS− ensures balanced PSRR and low ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Enables ≤100 pA input bias current - essential for accurate integration of nanoampere-level photodiode currents without drift-induced offset. |
| High GBW with low noise | 180 MHz gain-bandwidth + 5.4 nV/√Hz voltage noise - permits simultaneous wide bandwidth and high SNR in optical receiver front-ends. |
| Wide supply range | Operates from ±5 V to ±15 V - supports legacy ±15 V test equipment and modern low-voltage embedded systems without redesign. |
| Unity-gain stable | No external compensation needed for G = +1 - simplifies active filter, integrator, and buffer designs while ensuring phase margin >45°. |
| High output drive | ±12.8 V swing into 1 kΩ and ±80 mA sourcing - drives coaxial cables, ADC inputs, or downstream op-amps directly without level-shifting. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying current output from fast silicon photodiodes (e.g., 18–220 pF junction capacitance) in fiber-optic receivers or laser rangefinders. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal noise and peaking. Use Value: Achieves 3.3 MHz −3 dB bandwidth at 100 kΩ gain with 18 pF diode capacitance using 0.6 pF CF, per TI characterization data. |
Use Scenario: Converting DAC output current to precise voltage in automated test equipment requiring >10 MHz update rates. IC Role / Device Role / Timing Role: Current-to-voltage buffer with low input bias current to prevent DAC output error accumulation. Use Value: Maintains <1 mV offset error over temperature with 100 pA max IIB, preserving 16-bit DAC linearity in closed-loop systems. |
| Test and Measurement Systems | Active Filtering |
|
Use Scenario: Front-end gain block in oscilloscope vertical amplifiers or spectrum analyzer IF stages handling ±10 V signals. IC Role / Device Role / Timing Role: High-Z, low-distortion signal conditioner preceding ADC sampling at ≥50 MSPS. Use Value: Delivers −77 dBc 2nd harmonic at 1 MHz (RL = 1 kΩ), meeting ENOB >12 bits for 10 MHz analog bandwidth. |
Use Scenario: Implementing 4th-order Sallen-Key or MFB filters in medical imaging signal chains requiring <0.02% differential gain error. IC Role / Device Role / Timing Role: Unity-gain stable amplifier providing precise pole/zero placement without phase-margin compromise. Use Value: Meets NTSC/PAL video specs (0.02% differential gain, 0.08° differential phase) at G = +2, RL = 150 Ω. |
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 ±15 V operation. | Better for low-voltage, ultra-wideband RF/IF gain; unsuitable for ±15 V test gear or high-dynamic-range photodiode amps. | Select OPA655 only when system rails are strictly ±5 V and bandwidth >180 MHz is mandatory. |
| OPA637 | Lower GBW (80 MHz), higher slew rate (135 V/µs), same ±15 V rating; 4.5 nV/√Hz noise; gain-of-5 stable (not unity-gain). | Preferred for fixed-gain, high-slew applications like pulse amplification; requires external compensation for G = +1. | Choose OPA637 when gain is fixed at +5 and lower noise is prioritized over transimpedance flexibility. |
Compared with OPA655 and OPA637, THS4601CD uniquely balances ±15 V operation, unity-gain stability, and 180 MHz GBW - making it the only option among the three for wide-supply, wide-gain-range transimpedance designs without external compensation.
Availability
THS4601CD is available at Aetrix Electronics and suitable for wideband photodiode amplification, high-speed test instrumentation, and active filtering applications requiring stable component supply across industrial temperature ranges (0°C to 70°C).
Supply support for THS4601CD 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 THS4601CD belongs to TI's high-speed FET-input op-amp product line, engineered specifically for transimpedance amplification, optical sensing, and wideband analog front-ends where low input bias current and high GBW must coexist.
FAQ
What is the maximum recommended supply voltage for THS4601CD?
The absolute maximum supply voltage for THS4601CD is ±16.5 V, but the specified operating range is ±5 V to ±15 V. Operating at ±15 V enables full output swing (±12.8 V into 1 kΩ) and optimal slew rate (100 V/µs). Exceeding ±15 V risks reliability degradation per TI's absolute maximum ratings table in SLOS388B.
Does THS4601CD require external compensation for unity-gain operation?
No, THS4601CD is unity-gain stable per its datasheet specification. It achieves adequate phase margin (>45°) in G = +1 configurations without external compensation components, simplifying designs for buffers and active filters. This is confirmed in the "DESCRIPTION" section and Figure 8 (open-loop gain/phase plot) of SLOS388B.
What is the input bias current specification for THS4601CD over temperature?
THS4601CD has a maximum input bias current of 100 pA at 25°C, rising to 550 pA over the full 0°C to 70°C operating range. At −40°C to 85°C (for THS4601ID), it reaches 1100 pA max. This temperature-dependent drift is documented in the "electrical specifications" tables on pages 3 and 5 of SLOS388B.
Can THS4601CD drive a 50 Ω load directly?
THS4601CD is not optimized for direct 50 Ω driving: its typical sourcing current is −80 mA (min −59 mA) into 20 Ω, and output swing collapses significantly below ±2 V at 50 Ω. For 50 Ω systems, use a dedicated line driver or add a series resistor to match impedance while preserving signal integrity - as implied by RL = 1 kΩ test conditions throughout the datasheet.
How does THS4601CD perform in transimpedance circuits with 100 pF photodiode capacitance?
With 100 pF source capacitance, THS4601CD achieves 1.3 MHz −3 dB bandwidth at 100 kΩ transimpedance gain using 1.5 pF feedback capacitor (Table 1, page 15 of SLOS388B). This performance is enabled by its 180 MHz GBW and low input capacitance, making it viable for medium-speed optical detection where diode capacitance dominates bandwidth limits.
THS4601CD 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:
- -
- 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-SOIC
THS4601CD FAQ
1.How can I place an order for THS4601CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4601CD 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 THS4601CD reliable?
The price and inventory of THS4601CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4601CD is usually 5 days.
3.What payment methods are accepted for THS4601CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4601CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4601CD?
THS4601CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4601CD 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 THS4601CD?
For technical support, including THS4601CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4601CD requirements.
6.How does Aetrix verify that THS4601CD is sourced from the original manufacturer or authorized distributors?
All THS4601CD 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 THS4601CD meets industry standards.
7.What is the process for return or replacement of THS4601CD?
All THS4601CD units undergo pre-shipment inspection (PSI). If there is an issue with THS4601CD, 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 THS4601CD part is unused and in its original packaging.
Return procedure for THS4601CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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