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Analog Devices Inc./Maxim Integrated ICL7614DCTV-2
- Part No.:
- ICL7614DCTV-2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
ICL7614DCTV-2.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,317
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Product details
Overview
ICL7614DCTV-2 from Maxim Integrated is a single, externally compensated, ultra-low-input-bias-current CMOS operational amplifier in an 8-pin TO-99 metal-can package. It delivers 1pA typical input bias current, ±1V to ±8V dual-supply operation (or 2V–16V single supply), and programmable quiescent current (10µA/100µA/1mA) - enabling precision long-time-constant integrators and picoammeter front-ends in battery-powered pH meters and photodiode amplifiers.
For engineers reviewing the ICL7614DCTV-2 datasheet, ICL7614DCTV-2 pinout, ICL7614DCTV-2 application, or ICL7614DCTV-2 equivalent, key selection factors include its external compensation flexibility (39pF capacitor between COMP and OUT), TO-99 thermal/mechanical stability, guaranteed 1pA bias current at +25°C, and extended common-mode range compatibility with single-supply sensor interfaces.
Technical Context
The ICL7614DCTV-2 uses a monolithic CMOS process to achieve ultra-high input impedance (10¹² Ω) and sub-picoampere bias current. Its externally compensated architecture allows bandwidth and slew rate tuning via a single capacitor (≥39pF) between pins 6 (COMP) and 8 (OUT), supporting gain ≥5 at 10µA IQ, ≥10 at 100µA IQ, and ≥20 at 1mA IQ.
Unlike internally compensated variants (e.g., ICL7611), the ICL7614DCTV-2 requires explicit frequency compensation for stability. Its output stage operates in Class A for high-linearity swing (±4.8V @ ±5V, RL = 1MΩ) and transitions to Class AB under heavier loads, with source current independent of quiescent current but sink current scaling with IQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical at +25°C - enables femtoamp-level leakage-sensitive circuits like pH electrode buffers. |
| Supply Voltage Range | ±1V to ±8V dual or 2V–16V single - supports low-voltage battery operation and wide-rail industrial sensing. |
| Quiescent Current | Pin-selectable: 10µA / 100µA / 1000µA - trades bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs) for power. |
| Input Impedance | 10¹² Ω - preserves signal integrity with high-impedance sources such as photodiodes and piezoelectric sensors. |
| Output Swing | ±4.8V @ ±5V, RL = 1MΩ - delivers rail-to-rail compatible dynamic range without level-shifting circuitry. |
| Unity-Gain Bandwidth | 1.4 MHz max (at 1mA IQ) - sufficient for low-frequency active filters and sample/hold circuits up to ~100 kHz. |
| Noise Current | 0.01 pA/√Hz - minimizes current-noise contribution in transimpedance amplifiers. |
Pinout & Package
ICL7614DCTV-2 is housed in an 8-pin TO-99 metal-can package with hermetic sealing and case-connected pin 7 for EMI shielding and thermal dissipation (250mW max at +25°C, derated 2mW/°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative supply | Reference for dual-supply operation; connects to ground in single-supply configurations. |
| 2 (OUTPUT) | Amplifier output | Class A/AB output stage capable of ±4.8V swing into 1MΩ load at ±5V supplies. |
| 3 (OFFSET) | Offset null (inverting side) | Connects to wiper of 25kΩ potentiometer for manual VOS trimming; functional at IQ ≥ 100µA. |
| 4 (OFFSET) | Offset null (non-inverting side) | Completes offset-null network; tied to V+ with potentiometer ends at pins 3 and 4. |
| 5 (−IN) | Inverting input | High-impedance node (10¹² Ω); guard ring required on PCB to prevent leakage-induced drift. |
| 6 (IOSET) | Quiescent current select | Voltage-controlled: tie to V+ (10µA), float near mid-rail (100µA), or tie to V− (1mA). |
| 7 (Case) | Shielding & thermal path | Internally connected to metal can; must be grounded for EMI suppression and thermal stability. |
| 8 (V+) | Positive supply | Accepts up to +8V (dual) or +16V (single); powers internal CMOS bias networks and output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Externally compensated | Stability and bandwidth tuned via single 39pF+ capacitor between COMP (pin 6) and OUT (pin 2), enabling gain ≥5 at 10µA IQ. |
| 1pA input bias current | Enables integration time constants >1000 seconds in low-leakage integrators without significant droop. |
| TO-99 metal-can package | Provides superior thermal conductivity, hermetic sealing, and EMI shielding vs. plastic packages - critical for lab-grade instrumentation. |
| Programmable IQ (10µA/100µA/1mA) | Allows dynamic trade-off: 10µA for nanoamp battery life, 1mA for 1.4MHz bandwidth in fast sample/hold circuits. |
| 10¹² Ω input resistance | Maintains signal fidelity with ultra-high-Z sources (e.g., glass pH electrodes, pyroelectric sensors) without loading error. |
Applications
| Photodiode Amplifier | pH Meter Front-End |
|---|---|
Use Scenario: Converting weak photocurrent (pA–nA) from a reverse-biased photodiode into a stable voltage signal. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current to minimize dark-current error and maximize dynamic range. Use Value: 1pA bias current ensures <0.1% measurement error on 1nA photocurrent; 0.01pA/√Hz noise preserves SNR in low-light detection. | Use Scenario: Conditioning mV-level output from a glass pH electrode in portable or benchtop analyzers. IC Role / Device Role / Timing Role: High-impedance buffer and precision DC amplifier with offset nulling for <1mV accuracy over temperature. Use Value: 10¹² Ω input impedance prevents electrode polarization; 1pA bias current avoids drift in high-resistance reference junctions. |
| Long-Time-Constant Integrator | Low-Droop Sample/Hold |
Use Scenario: Building analog integrators for energy metering or radiation dosimetry requiring >1000-second time constants. IC Role / Device Role / Timing Role: Precision integrator core where input bias current directly determines droop rate (ΔV/dt = IB/C). Use Value: 1pA bias current limits droop to <0.36mV/hour on a 1µF capacitor - enabling hour-scale integration without auto-zeroing. | Use Scenario: Capturing and holding slow-varying sensor outputs (e.g., thermocouple, strain gauge) in data loggers. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input current to minimize hold-mode leakage through sampling capacitor. Use Value: 1pA bias current reduces droop to <0.36mV/s on a 1nF hold capacitor - extending usable hold time beyond 10 seconds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CN8#PBF | Zero-drift chopper architecture; 10pA max input bias; fixed 1.2mA supply current; no external compensation pin. | Superior DC accuracy (0.5µV VOS) but higher power and fixed bandwidth; unsuitable for battery-critical designs. | Select when ultra-low offset drift dominates over power; avoid if 10µA IQ mode or external compensation is required. |
| OPA128SM | Electrometer-grade JFET input; 25fA typical bias current; DIP-8 metal-can; no IQ programming; 1.5MHz GBW. | Lower bias current enables femtoamp measurements, but lacks programmable IQ and requires tighter layout control. | Select for sub-picoamp applications (e.g., ion chamber readout); avoid when quiescent current flexibility or TO-99 pinout compatibility is mandatory. |
Compared with LTC1050CN8#PBF and OPA128SM, the ICL7614DCTV-2 uniquely balances ultra-low bias current (1pA), programmable power (10µA–1mA), external compensation for gain flexibility, and TO-99 robustness - making it optimal for field-deployable, battery-operated precision analog front-ends where design longevity and thermal stability are critical.
Availability
ICL7614DCTV-2 is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time-constant integrators requiring stable component supply across industrial, medical, and test equipment lifecycles.
Supply support for ICL7614DCTV-2 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for precision, industrial, and communications applications.
The ICL761X–ICL764X family was designed specifically for ultra-low-input-current, low-power precision signal conditioning - targeting pH meters, photodiode amplifiers, picoammeters, and other applications demanding femtoamp-level leakage control and wide supply flexibility.
FAQ
What is the function of pin 6 (IOSET) on the ICL7614DCTV-2?
Pin 6 (IOSET) on the ICL7614DCTV-2 selects quiescent current: connect to V+ for 10µA, float near mid-supply for 100µA, or tie to V− for 1000µA. This directly scales unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs) while preserving 1pA input bias current. The ICL7614DCTV-2's IOSET pin enables adaptive power/performance tuning without changing external components.
Does the ICL7614DCTV-2 require external compensation, and why?
Yes, the ICL7614DCTV-2 requires external compensation via a capacitor (≥39pF) between pin 6 (IOSET/COMP) and pin 2 (OUTPUT) to ensure stability. Unlike internally compensated variants (e.g., ICL7611), this architecture allows designers to optimize bandwidth and phase margin for specific closed-loop gains - supporting gain ≥5 at 10µA IQ, ≥10 at 100µA IQ, and ≥20 at 1mA IQ. The ICL7614DCTV-2's external compensation provides flexibility unattainable with fixed-compensation op amps.
Can the ICL7614DCTV-2 operate from a single 3.3V supply?
Yes, the ICL7614DCTV-2 supports single-supply operation from 2V to 16V. At 3.3V, its common-mode input range is 1.0V to 2.7V (V+ − 0.6V) with 10µA IQ, and output swing reaches ±1.5V into 1MΩ. For rail-to-rail input capability, consider ICL7612/ICL7616 variants. The ICL7614DCTV-2 remains viable for 3.3V sensor buffering when input signals stay within its specified CMVR and offset nulling is applied.
How is input offset voltage nulled on the ICL7614DCTV-2?
Input offset voltage on the ICL7614DCTV-2 is nulled using pins 3 and 4 (OFFSET terminals): connect a 25kΩ potentiometer across them with the wiper tied to V+. Nulling range is adequate for all VOS grades at IQ ≥ 100µA, but may be insufficient at 10µA IQ with higher-VOS variants (e.g., 15mV or 20mV). The ICL7614DCTV-2's offset nulling supports <1mV residual error in precision DC-coupled applications.
What is the maximum capacitive load the ICL7614DCTV-2 can drive stably?
The ICL7614DCTV-2 is not guaranteed stable with capacitive loads >100pF. Larger loads (>10µF) introduce a dominant pole and restore stability, but reduce bandwidth. For loads between 100pF and 10µF, isolation resistors (10–100Ω) in series with the output are recommended. The ICL7614DCTV-2's transconductance output stage makes capacitive loading a critical layout consideration - especially in photodiode TIA configurations.
ICL7614DCTV-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.6V/µs
- Gain Bandwidth Product:
- 1.4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 15 mV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
ICL7614DCTV-2 FAQ
1.How can I place an order for ICL7614DCTV-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7614DCTV-2 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 ICL7614DCTV-2 reliable?
The price and inventory of ICL7614DCTV-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7614DCTV-2 is usually 5 days.
3.What payment methods are accepted for ICL7614DCTV-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7614DCTV-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7614DCTV-2?
ICL7614DCTV-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7614DCTV-2 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 ICL7614DCTV-2?
For technical support, including ICL7614DCTV-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7614DCTV-2 requirements.
6.How does Aetrix verify that ICL7614DCTV-2 is sourced from the original manufacturer or authorized distributors?
All ICL7614DCTV-2 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 ICL7614DCTV-2 meets industry standards.
7.What is the process for return or replacement of ICL7614DCTV-2?
All ICL7614DCTV-2 units undergo pre-shipment inspection (PSI). If there is an issue with ICL7614DCTV-2, 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 ICL7614DCTV-2 part is unused and in its original packaging.
Return procedure for ICL7614DCTV-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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