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Analog Devices Inc./Maxim Integrated ICL7612DESA
- Part No.:
- ICL7612DESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7612DESA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
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Product details
Overview
ICL7612DESA from Maxim Integrated is a single-channel, ultra-low-input-bias-current CMOS operational amplifier with programmable quiescent current (10 μA/100 μA/1 mA), extended common-mode voltage range (±5.3 V at 10 μA), and 1 pA typical input bias current. It operates from ±1 V to ±8 V supplies or 2–16 V single supply, delivering rail-to-rail output swing and targeting high-impedance sensor interfaces including pH meters and photodiode amplifiers.
For engineers reviewing the ICL7612DESA datasheet, ICL7612DESA pinout, ICL7612DESA application, or ICL7612DESA equivalent, this device is selected for ultra-low-leakage signal conditioning in battery-powered instrumentation, long-time-constant integrators, low-droop sample/hold circuits, and precision electrochemical sensing where sub-picoampere input bias and millivolt-level offset stability are critical.
Technical Context
The ICL7612DESA implements a monolithic CMOS architecture with externally configurable quiescent current via the IOSET pin, enabling trade-offs between power (10 μA min) and performance (1.4 MHz GBW, 1.6 V/µs slew rate at 1 mA). Its extended common-mode input range supports operation near the negative rail-critical for single-supply transducer front-ends.
Unlike fixed-IQ variants (e.g., ICL7622), the ICL7612DESA's programmable bias enables optimization across operating conditions: 10 μA for micro-power battery life, 100 μA for moderate bandwidth, and 1 mA for full-speed response-each validated over –40°C to +85°C with guaranteed VOS ≤ 20 mV and IBIAS ≤ 4000 pA max.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical; enables picoammeter-grade leakage control in high-Z source applications like photodiode or ion-selective electrode circuits. |
| Common-Mode Range | ±5.3 V at 10 μA IQ; supports input signals extending 5.3 V below V+ and 5.3 V above V−-ideal for single-supply pH probe interfacing. |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single; accommodates coin-cell (3 V), Li-ion (up to 16 V), and industrial 12 V rails without level-shifting. |
| Output Swing | ±4.7 V into 1 MΩ at ±5 V supply; delivers >94% rail-to-rail swing-minimizes dynamic range loss in low-voltage data acquisition. |
| Unity-Gain Bandwidth | 1.4 MHz at 1 mA IQ; sufficient for 100 kHz closed-loop gain-of-10 amplifiers with <0.1% settling error. |
| Input Impedance | 1012 Ω; prevents loading of megohm-range sensor elements such as glass pH electrodes or piezoresistive strain gauges. |
| Noise Current | 0.01 pA/√Hz; dominates noise floor only above ~100 kΩ source impedance-key for optimizing SNR in femtoampere-level measurements. |
Pinout & Package
ICL7612DESA is housed in an 8-pin Small Outline (SO) package (SA code), measuring 4.9 mm × 6.0 mm × 1.75 mm, with gull-wing leads and JEDEC MS-012AC compliance. Pin 7 is internally connected to the die substrate but not electrically tied to any internal node per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | CMOS rail-to-rail output stage capable of sourcing/sinking ≥10 mA-supports direct driving of ADC reference buffers or low-RL loads. |
| 2 (+IN) | Noninverting Input | High-impedance CMOS gate input; requires guard ring layout for leakage-sensitive PCBs to preserve 1 pA bias spec. |
| 3 (–IN) | Inverting Input | Differential pair input node; matched to +IN for optimal CMRR-used in transimpedance or difference amplifier configurations. |
| 4 (V–) | Negative Supply | Accepts –1 V to –8 V; must be decoupled with ≥0.1 μF ceramic capacitor placed within 5 mm of pin for stability at all IQ settings. |
| 5 (OFFSET) | Offset Null (Pin 5) | Connects to wiper of 25 kΩ potentiometer; nulling range is limited at 10 μA IQ-verify VOS ≤ 15 mV before trimming. |
| 6 (OFFSET) | Offset Null (Pin 6) | Paired with Pin 5 for external offset adjustment; unused pins must remain unconnected-not tied to V+ or ground. |
| 7 (IOSET) | Quiescent Current Select | Voltage-controlled IQ setting: tie to V+ for 10 μA, float (V–+0.8V to V+–0.8V) for 100 μA, or tie to V– for 1 mA-no external resistor needed. |
| 8 (V+) | Positive Supply | Accepts +1 V to +8 V; supplies both input stage and output driver-decoupling essential to maintain PSRR >70 dB. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Quiescent Current | Three discrete IQ settings (10/100/1000 μA) enable dynamic power/performance scaling without changing BOM or layout-reduces system standby current by 100× vs. fixed 100 μA op-amps. |
| Extended Common-Mode Range | ±5.3 V input range at 10 μA allows direct interface to sensors operating at negative potentials (e.g., grounded-reference pH electrodes) without level-shifting circuitry. |
| Ultra-Low Input Bias Current | 1 pA typical ensures <1 mV error from 1 GΩ source impedance-critical for maintaining accuracy in 10-second time-constant integrators used in energy metering. |
| Rail-to-Rail Output Swing | Swings within 20 mV of V+ and V– at light loads; preserves full ADC input range in 12-bit+ systems powered from 3.3 V or 5 V rails. |
| Monolithic CMOS Construction | Eliminates junction leakage paths found in bipolar op-amps-guarantees stable IBIAS over –40°C to +85°C without thermal drift compensation. |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring hydrogen ion concentration in aqueous solutions using a glass electrode with 100 MΩ to 1 GΩ output impedance. IC Role / Device Role / Timing Role: High-impedance buffer and DC-coupled amplifier with offset nulling to reject electrode drift and thermal EMF. Use Value: 1 pA IBIAS limits measurement error to <0.1 mV at 1 GΩ source-enabling ±0.01 pH resolution without active guarding. | Use Scenario: Converting weak photocurrents (10 pA–1 nA) from silicon PIN diodes in spectrophotometers or smoke detectors. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with programmable gain and bandwidth via feedback resistor/capacitor selection. Use Value: 0.01 pA/√Hz noise current minimizes Johnson noise dominance-achieving 100 fA/√Hz system noise floor with 10 MΩ feedback. |
| Low-Droop Sample/Hold Circuit | Battery-Powered Precision Integrator |
Use Scenario: Capturing slow-varying analog signals (e.g., temperature, pressure) in portable data loggers with >1-hour hold time. IC Role / Device Role / Timing Role: Unity-gain follower with ultra-low input current feeding a 10 nF hold capacitor. Use Value: 1 pA IBIAS limits droop to <0.036 mV/hour-extending usable hold time 100× beyond standard JFET-input op-amps. | Use Scenario: Integrating charge from radiation detectors or capacitive touch sensors in handheld medical devices. IC Role / Device Role / Timing Role: Precision integrator with external offset null and selectable IQ to balance integration time constant vs. battery life. Use Value: Programmable 10 μA IQ extends coin-cell lifetime to >5 years while maintaining 100 pC/V scale factor accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1050CS8#PBF | Chopper-stabilized, 0.05 pA IBIAS, 1.2 MHz GBW, fixed 170 μA supply current, no IQ programming. | Superior offset drift (<0.05 μV/°C) but higher EMI susceptibility; unsuitable for high-frequency photodiode AC coupling. | Select when nanovolt-level DC stability outweighs power flexibility-requires additional filtering for noisy environments. |
| TLC27L2CDR | Single-supply CMOS, 0.6 pA IBIAS, 85 kHz GBW, fixed 20 μA supply, no extended CMVR. | Lower cost and smaller footprint (SOIC-8), but lacks rail-to-rail input and cannot interface to negative-swing sensors. | Select for cost-sensitive, single-supply-only applications with source impedances <100 MΩ and no negative input requirement. |
Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7612DESA uniquely combines programmable quiescent current, extended common-mode range, and 1 pA bias in a single SO-8 package-making it the only option that simultaneously satisfies multi-decade power scalability, pH-electrode compatibility, and photodiode noise requirements.
Availability
ICL7612DESA is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, long-time-constant integrators, and precision electrochemical sensing requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7612DESA 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 industrial, medical, and communications systems.
The ICL761X family was engineered specifically for ultra-high-impedance, low-power signal conditioning-targeting applications where input leakage, supply flexibility, and temperature-stable offset are non-negotiable.
FAQ
What is the maximum supply voltage rating for the ICL7612DESA?
The ICL7612DESA has an absolute maximum total supply voltage (V+ to V−) of +18 V. It operates continuously across ±1 V to ±8 V dual supplies or 2–16 V single supplies. Exceeding ±8 V on either rail risks violating the input voltage limit of (V+ + 0.3 V) to (V− − 0.3 V), potentially damaging the input stage. Always observe derating curves for power dissipation above +25°C ambient.
How do I configure the quiescent current (IQ) on the ICL7612DESA?
The ICL7612DESA's IQ is set via the IOSET pin (Pin 7): connect Pin 7 to V+ for 10 μA, leave it floating between V− + 0.8 V and V+ − 0.8 V for 100 μA, or tie Pin 7 to V− for 1 mA. No external resistors are required. This configuration is valid across the full –40°C to +85°C operating range and directly scales unity-gain bandwidth and slew rate while preserving rail-to-rail output swing.
Does the ICL7612DESA support true rail-to-rail input operation?
No-the ICL7612DESA does not support rail-to-rail input. It features an extended common-mode voltage range of ±5.3 V at 10 μA IQ (i.e., V− − 5.3 V to V+ + 5.3 V), which exceeds standard CMOS op-amps but still excludes the V− rail itself. For true rail-to-rail input, consider alternatives like the ADA4530-1. The ICL7612DESA's strength lies in its ultra-low bias current and extended range-not full rail inclusion.
Can the ICL7612DESA drive a 10 kΩ load while maintaining rail-to-rail output swing?
Yes-but only at the 1 mA IQ setting. At 1 mA, the ICL7612DESA delivers ±4.5 V output swing into 10 kΩ with ±5 V supplies (90% rail-to-rail). At 100 μA IQ, swing degrades to ±4.5 V into 100 kΩ; at 10 μA, it requires ≥1 MΩ load for ±4.7 V swing. Always verify load-dependent VOUT specs in Table 6 of the datasheet for your specific IQ and supply condition.
Is the ICL7612DESA pin-compatible with other ICL761X variants like ICL7612CPA?
Yes-the ICL7612DESA shares identical pinout and electrical functionality with all 8-pin ICL761X variants (e.g., ICL7612CPA, ICL7612CTV), differing only in temperature range (–40°C to +85°C vs. 0°C to +70°C) and package (Small SO vs. Plastic DIP or TO-99). No PCB redesign is needed when upgrading from C-grade to E-grade in SO-8 format, provided solder profile and thermal relief match JEDEC MS-012AC standards.
ICL7612DESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- 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:
- 15 mV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7612DESA FAQ
1.How can I place an order for ICL7612DESA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7612DESA 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 ICL7612DESA reliable?
The price and inventory of ICL7612DESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7612DESA is usually 5 days.
3.What payment methods are accepted for ICL7612DESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7612DESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7612DESA?
ICL7612DESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7612DESA 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 ICL7612DESA?
For technical support, including ICL7612DESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7612DESA requirements.
6.How does Aetrix verify that ICL7612DESA is sourced from the original manufacturer or authorized distributors?
All ICL7612DESA 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 ICL7612DESA meets industry standards.
7.What is the process for return or replacement of ICL7612DESA?
All ICL7612DESA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7612DESA, 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 ICL7612DESA part is unused and in its original packaging.
Return procedure for ICL7612DESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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