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Analog Devices Inc./Maxim Integrated ICL7614ACPA
- Part No.:
- ICL7614ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7614ACPA.pdf
- Description:
- IC CMOS 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:6,227
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Product details
Overview
ICL7614ACPA from Maxim Integrated is a single, externally compensated, ultra-low-input-bias-current CMOS operational amplifier in an 8-pin plastic DIP 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 ICL7614ACPA datasheet, ICL7614ACPA pinout, ICL7614ACPA application, or ICL7614ACPA equivalent, key selection criteria include verified 1pA bias current at +25°C, external 39pF compensation requirement, ±0.96V output swing into 1MΩ at 0°C–+70°C, and confirmed TO-99-compatible 8-pin DIP footprint with offset-null capability.
Technical Context
The ICL7614ACPA uses monolithic CMOS architecture with pin-selectable quiescent current (via IOSET pin), enabling trade-offs between bandwidth (0.044–1.4 MHz), slew rate (0.016–1.6 V/µs), and power consumption. Its externally compensated design requires a 39pF capacitor between COMP (Pin 6) and OUT (Pin 1) for unity-gain stability - unlike internally compensated variants (e.g., ICL7611).
Input stage features 10¹²Ω input impedance and 0.01pA/√Hz noise current, optimized for high-impedance sources. Output swings within millivolts of rails under light loads (1MΩ), but degrades to ±4.3V at 10kΩ with 1mA IQ - confirming Class A/AB hybrid output stage behavior dependent on load and quiescent setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1pA typical at +25°C - enables femtoampere-level signal integrity in picoammeters and photodiode transimpedance stages. |
| Supply Voltage Range | ±1V to ±8V dual or 2V–16V single - supports ultra-low-voltage battery operation (e.g., 2×AA) and rail-to-rail-swing applications. |
| Quiescent Current | Pin-selectable: 10µA / 100µA / 1000µA - directly scales unity-gain bandwidth (0.044/0.48/1.4 MHz) and slew rate (0.016/0.16/1.6 V/µs). |
| Output Voltage Swing | ±4.3V min into 10kΩ at ±5V supplies and 1mA IQ - defines usable dynamic range in low-impedance active filters and sample/hold buffers. |
| Input Offset Voltage | 3mV max over 0°C to +70°C - sets absolute DC error floor in precision integrators requiring <10nV/s drift. |
| Unity-Gain Bandwidth | 1.4MHz at 1mA IQ - determines maximum closed-loop bandwidth for gain ≥1 configurations with external compensation. |
| Common-Mode Range | −4.0V to +4.2V at ±5V supplies and 10µA IQ - constrains input voltage headroom in single-supply sensor interfaces. |
Pinout & Package
ICL7614ACPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch width, industry-standard pinout, and through-hole mounting compatibility. Pin 7 is internally connected to the case (ground reference for TO-99 metal-can variant, but electrically isolated in plastic DIP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | CMOS rail-swing output; requires external 39pF compensation capacitor to Pin 6 for stability. |
| 2 (+IN) | Noninverting input | Ultra-high-impedance node (10¹²Ω); guard ring layout mandatory to preserve 1pA bias spec. |
| 3 (−IN) | Inverting input | Differential input pair node; offset nulling applied via Pins 5/6 to V+. |
| 4 (V−) | Negative supply | Accepts −1V to −8V; sets lower common-mode limit and output swing floor. |
| 5 (OFFSET) | Offset null (pin 1) | Connect 25kΩ pot wiper to V+; nulling range sufficient for all VOS grades at 100µA/1mA IQ. |
| 6 (COMP) | Compensation | External capacitor connection point; 39pF minimum to OUT (Pin 1) ensures unity-gain stability. |
| 7 (NC) | No connect | Internally tied to case in TO-99 version; electrically open in plastic DIP (ICL7614ACPA). |
| 8 (V+) | Positive supply | Accepts +1V to +8V; powers internal bias network and sets upper common-mode/output limits. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA typical enables sub-picoampere leakage-critical circuits like pH electrode amplifiers and long-duration integrators. |
| Programmable quiescent current | Three discrete IQ settings (10/100/1000µA) allow precise power-bandwidth optimization without redesigning compensation. |
| External frequency compensation | 39pF capacitor between COMP and OUT pins guarantees stable unity-gain operation while permitting bandwidth tuning. |
| Offset null capability | Two dedicated OFFSET pins support 25kΩ potentiometer nulling - critical for DC-coupled precision measurement chains. |
| Rail-to-rail output swing | Swings within millivolts of V+/V− under light loads (1MΩ), maximizing dynamic range in low-power sensor signal conditioning. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: High-impedance glass electrode (≥1GΩ) measuring solution pH in portable field instruments. IC Role / Device Role / Timing Role: Ultra-low-bias-current voltage follower and buffer preceding ADC input. Use Value: 1pA input bias prevents electrode polarization and drift, ensuring <0.01 pH unit accuracy over 24-hour measurements. | Use Scenario: Converting weak photocurrent (100fA–10nA) from silicon photodiodes in spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain and low-noise current-to-voltage conversion. Use Value: 0.01pA/√Hz input noise current and 10¹²Ω input resistance preserve SNR in femtoampere-range optical detection. |
| Long-Time-Constant Integrator | Low-Droop Sample/Hold Amplifier |
Use Scenario: Integrating charge from radiation detectors or electrochemical sensors over minutes to hours. IC Role / Device Role / Timing Role: Precision integrator using ultra-stable capacitor and near-zero-input-current op amp. Use Value: 1pA bias current limits integration error to <1mV/hour on 1µF capacitor - enabling >10-hour linear ramp generation. | Use Scenario: Capturing and holding analog sensor outputs (e.g., temperature, pressure) in data loggers with multi-second hold times. IC Role / Device Role / Timing Role: Unity-gain buffer with ultra-low input current feeding hold capacitor. Use Value: Sub-10nA leakage ensures <1LSB droop over 10 seconds on 10nF hold capacitor at 12-bit resolution. |
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 auto-zero architecture; 10pA max IB at +25°C; fixed 1.2mA supply current; no IQ programming. | Better VOS drift (0.05µV/°C) but higher power; unsuitable for µA-level battery life targets. | Select when DC precision dominates power budget; avoid if 10µA IQ mode is required for system-level power gating. |
| TLC27L4CDR | Single-supply only (3–16V); 60pA max IB at +25°C; fixed 17µA supply; no external compensation pin. | Lower cost and smaller SOIC-14 package; insufficient for picoampere-level photodiode apps requiring <1pA IB. | Select for cost-sensitive, single-supply industrial sensors where 60pA IB meets accuracy requirements. |
Compared with LTC1050CN8#PBF and TLC27L4CDR, the ICL7614ACPA uniquely balances programmable ultra-low power (10µA IQ), verified 1pA bias current, and external compensation flexibility - making it irreplaceable in battery-powered, high-impedance, long-duration analog signal chains.
Availability
ICL7614ACPA is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time-constant integrators requiring stable component supply across extended production lifecycles.
Supply support for ICL7614ACPA 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and instrumentation applications.
The ICL761X–ICL764X family was engineered specifically for ultra-low-input-current signal conditioning - targeting pH meters, picoammeters, and electrochemical sensor interfaces where femtoampere-level leakage invalidates conventional op amps.
FAQ
What is the minimum compensation capacitor value required for stable operation of the ICL7614ACPA?
The ICL7614ACPA requires a minimum 39pF capacitor between Pin 6 (COMP) and Pin 1 (OUT) for guaranteed unity-gain stability. Reducing this value increases bandwidth and slew rate but risks oscillation; values below 30pF are not characterized. This external compensation distinguishes the ICL7614ACPA from internally compensated variants like the ICL7611ACPA, and must be implemented on PCB layout for every ICL7614ACPA unit.
Does the ICL7614ACPA support true rail-to-rail input common-mode range?
No, the ICL7614ACPA does not support rail-to-rail input. Its common-mode voltage range is specified as −4.0V to +4.2V at ±5V supplies with 10µA IQ - excluding the negative rail (V−) and extending only 0.2V beyond V+ under those conditions. For rail-inclusive input, the ICL7612ACPA or ICL7616ACPA variants are required. The ICL7614ACPA's input stage is optimized for ultra-low bias current, not extended CMVR.
Can the ICL7614ACPA operate from a single 3.3V supply?
Yes, the ICL7614ACPA supports single-supply operation from 2V to 16V. At 3.3V, it delivers usable performance: output swing ≥±1.4V into 1MΩ (per datasheet Figure 11), 1pA input bias current preserved, and quiescent current selectable down to 10µA. However, common-mode input range shrinks to approximately 0.3V–2.9V, and output headroom reduces - verify against specific circuit gain and signal swing requirements before deployment.
How is input offset voltage nulled on the ICL7614ACPA?
Input offset voltage on the ICL7614ACPA is nulled using a 25kΩ potentiometer: connect its two outer terminals to Pins 5 and 6 (OFFSET pins), and its wiper to V+ (Pin 8). This configuration provides full nulling range for all VOS grades (2–15mV) when IQ is set to 100µA or 1mA. At 10µA IQ, nulling may be incomplete for higher-VOS variants (e.g., ICL7614DCPA), so VOS grade selection must align with chosen quiescent current.
What is the maximum capacitive load the ICL7614ACPA can drive without instability?
The ICL7614ACPA is not characterized for direct driving of capacitive loads >100pF. Loads exceeding this threshold risk peaking or oscillation due to phase margin degradation. For larger capacitors (e.g., ADC input hold capacitors), isolate with a series resistor (≥100Ω) or use a dedicated buffer stage. The device's transconductance output stage remains stable with very large (>10µF) capacitive loads, but only when resistive load is ≥5kΩ - a condition not met in typical capacitive-drive scenarios.
ICL7614ACPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.6V/µs
- Gain Bandwidth Product:
- 1.4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 2 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:
- 8-PDIP
ICL7614ACPA FAQ
1.How can I place an order for ICL7614ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7614ACPA 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 ICL7614ACPA reliable?
The price and inventory of ICL7614ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7614ACPA is usually 5 days.
3.What payment methods are accepted for ICL7614ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7614ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7614ACPA?
ICL7614ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7614ACPA 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 ICL7614ACPA?
For technical support, including ICL7614ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7614ACPA requirements.
6.How does Aetrix verify that ICL7614ACPA is sourced from the original manufacturer or authorized distributors?
All ICL7614ACPA 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 ICL7614ACPA meets industry standards.
7.What is the process for return or replacement of ICL7614ACPA?
All ICL7614ACPA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7614ACPA, 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 ICL7614ACPA part is unused and in its original packaging.
Return procedure for ICL7614ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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