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Analog Devices Inc./Maxim Integrated ICL7612BCSA-T
- Part No.:
- ICL7612BCSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7612BCSA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,913
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Product details
Overview
ICL7612BCSA-T from Maxim Integrated is a single, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10 μA/100 μA/1 mA), ±1 V to ±8 V dual-supply operation (or 2–16 V single supply), 1 pA typical input bias current at +25°C, extended common-mode voltage range (±5.3 V at IQ = 10 μA), and rail-to-rail output swing - ideal for pH meter front-ends and picoammeter circuits.
For engineers reviewing the ICL7612BCSA-T datasheet, ICL7612BCSA-T pinout, ICL7612BCSA-T application, or ICL7612BCSA-T equivalent, key selection criteria include confirmed 1 pA input bias current, programmable IQ enabling trade-offs between bandwidth (0.044–1.4 MHz) and power, extended VCMR unique to ICL7612 among the family, and SO-8 package compatibility with space-constrained battery-powered instrumentation.
Technical Context
The ICL7612BCSA-T implements a monolithic CMOS input stage with 10¹² Ω input impedance and 0.01 pA/√Hz input noise current, enabling stable DC coupling into high-impedance sources like photodiodes and glass electrodes. Its extended common-mode range (–1.1 V to +0.6 V referenced to V–/V+, or ±5.3 V at IQ = 10 μA) supports direct sensing of signals near supply rails without level-shifting.
Quiescent current is set externally via the IOSET pin: connection to V+ selects 10 μA, mid-supply (V– + 0.8 V to V+ – 0.8 V) selects 100 μA, and connection to V– selects 1 mA - directly scaling unity-gain bandwidth (0.044/0.48/1.4 MHz) and slew rate (0.016/0.16/1.6 V/µs) while preserving rail-to-rail output swing and low offset drift (10 µV/°C typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C - enables integration time constants >10⁶ seconds in ultra-low-leakage integrators |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single - supports coin-cell (3 V) and industrial (±5 V) rails without regulation |
| Extended Common-Mode Range | –1.1 V to +0.6 V (vs. V–/V+) - allows direct measurement of sensor outputs down to 100 mV above negative rail |
| Unity-Gain Bandwidth | 0.044 MHz (IQ = 10 μA) to 1.4 MHz (IQ = 1 mA) - selectable bandwidth matches signal frequency while minimizing power |
| Output Swing | ±4.9 V into 1 MΩ at ±5 V supplies - delivers full dynamic range across 98% of supply rails |
| Input Offset Voltage | 5 mV max at +25°C (B-grade) - sufficient for precision DC amplification when combined with external nulling |
| Package | 8-pin Small Outline (SO-8) - surface-mount compatible with automated assembly and 25 mm² board area |
Pinout & Package
ICL7612BCSA-T is housed in an 8-pin Small Outline (SO-8) package with standard industry pinout and exposed pad not present. Pin 7 is internally connected to the case (V–) in TO-99 variants but is unused (N.C.) in SO-8; all other pins retain functional equivalence per the family's standardized layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connect wiper of 25 kΩ pot to V+ for input offset trimming; effective only at IQ ≥ 100 μA |
| 2 | Inverting Input (–IN) | High-impedance CMOS node; accepts signals within extended common-mode range |
| 3 | Non-Inverting Input (+IN) | Matches –IN characteristics; used for unity-gain buffer or differential sensing |
| 4 | V– | Negative supply terminal; pin 7 is internally tied to this node in metal-can versions but N.C. in SO-8 |
| 5 | IOSET | Quiescent current control: tie to V+ (10 μA), mid-supply (100 μA), or V– (1 mA) |
| 6 | Output | Rail-to-rail CMOS output capable of sourcing/sinking ≥1 mA at ±5 V |
| 7 | N.C. | No internal connection in SO-8 package; electrically isolated per JEDEC MS-012 |
| 8 | V+ | Positive supply terminal; supports up to +8 V in dual-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables femtoampere-level current measurement without guard rings or Teflon insulation |
| Programmable quiescent current | Three discrete IQ settings allow precise optimization of speed vs. battery life in portable instruments |
| Extended common-mode input range | –1.1 V to +0.6 V relative to V–/V+ supports direct interfacing to electrochemical sensors operating near ground |
| Rail-to-rail output swing | Delivers >98% of supply voltage swing into 1 MΩ loads, maximizing ADC utilization in low-voltage systems |
| Monolithic CMOS architecture | Eliminates die bonding wires that cause leakage paths, ensuring long-term stability in humid environments |
Applications
| pH Meter Front-End | Picoammeter Circuit |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrode in handheld water quality testers. IC Role / Device Role / Timing Role: Precision DC-coupled transimpedance amplifier with ultra-high input impedance and sub-pA bias current. Use Value: Enables accurate pH resolution ≤0.01 unit without calibration drift caused by input leakage currents. | Use Scenario: Measuring leakage current in capacitor dielectric testing or semiconductor junction characterization. IC Role / Device Role / Timing Role: Low-noise, low-drift current-to-voltage converter with programmable gain and bandwidth. Use Value: Supports femtoampere detection (10⁻¹⁵ A) using 1 GΩ feedback resistor and 1 pA input bias floor. |
| Low-Droop Sample/Hold | Hearing Aid Microphone Preamp |
Use Scenario: Holding analog sensor outputs for ADC sampling in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Unity-gain buffer with <1 mV/s droop rate over 1 second using 1 nF hold capacitor. Use Value: Achieves <0.01% droop error over 1 s due to 1 pA input bias current limiting capacitor discharge. | Use Scenario: First-stage amplification of electret microphone output in hearing aids powered by zinc-air cells. IC Role / Device Role / Timing Role: Low-noise, low-power preamplifier operating from 1.2–1.5 V single supply with rail-to-rail output. Use Value: Delivers 100 dB SNR at 1 kHz while consuming only 10 μA, extending battery life beyond 2 weeks. |
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 |
|---|---|---|---|
| LTC1050CS8#PBF | Zero-drift auto-zero architecture; 50 fA max input bias current; fixed 1.2 mA supply current; SO-8 package | Better DC accuracy (0.5 µV offset) but higher power; no IQ programming; requires external clock | Select when nanovolt-level offset stability is critical and power budget allows ≥1 mA per channel |
| TLC27L2CDR | Single-supply CMOS op amp; 0.6 pA typical input bias; fixed 17 µA supply; SO-8; no extended VCMR | Lower power than ICL7612BCSA-T at 10 μA setting but lacks rail-near input capability and programmable IQ | Select for cost-sensitive, single-supply-only designs where extended common-mode range is unnecessary |
Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7612BCSA-T uniquely balances ultra-low bias current (1 pA), programmable power-speed trade-off, and extended input common-mode range - making it the only option among the three suitable for direct pH electrode interfacing with battery-life optimization.
Availability
ICL7612BCSA-T 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 temperature ranges (0°C to +70°C).
Supply support for ICL7612BCSA-T 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 and mixed-signal ICs for demanding industrial, medical, and portable applications.
The ICL761X family was engineered specifically for ultra-low-input-current signal conditioning in electrochemical, photodiode, and high-impedance sensor interfaces - prioritizing bias current, common-mode range, and supply flexibility over raw speed.
FAQ
What is the maximum supply voltage rating for the ICL7612BCSA-T?
The ICL7612BCSA-T has an absolute maximum total supply voltage (V+ to V–) of +18 V. It operates over a recommended range of ±1 V to ±8 V dual supply or 2 V to 16 V single supply. Exceeding +18 V risks permanent damage, and operation outside the recommended range may degrade parameters such as input bias current and common-mode rejection.
Does the ICL7612BCSA-T support rail-to-rail input operation?
No, the ICL7612BCSA-T does not support rail-to-rail input. It features an extended common-mode voltage range of –1.1 V to +0.6 V relative to V–/V+, which exceeds standard CMOS op amps but still excludes the positive rail. However, its rail-to-rail output swing (±4.9 V at ±5 V supplies) ensures full utilization of downstream ADCs.
How is quiescent current programmed on the ICL7612BCSA-T?
Quiescent current on the ICL7612BCSA-T is set via the IOSET pin (Pin 5): connect to V+ for 10 μA, apply a voltage between V– + 0.8 V and V+ – 0.8 V for 100 μA, or connect to V– for 1 mA. This selection directly scales unity-gain bandwidth and slew rate while maintaining rail-to-rail output performance and low input bias current.
Can the ICL7612BCSA-T be used in pH meter circuits?
Yes, the ICL7612BCSA-T is explicitly suited for pH meter front-ends due to its 1 pA typical input bias current, 10¹² Ω input impedance, and extended common-mode range (–1.1 V to +0.6 V), which accommodates the negative mV output of glass electrodes without level-shifting circuitry - a key requirement validated in Maxim's application notes for electrochemical sensing.
What is the function of Pin 7 on the ICL7612BCSA-T SO-8 package?
Pin 7 on the ICL7612BCSA-T SO-8 package is No Connect (N.C.). Unlike the TO-99 metal-can variant where Pin 7 is internally tied to V–, the SO-8 version leaves this pin unconnected per JEDEC MS-012 mechanical specifications - it must remain floating and should not be soldered or tied to any net.
ICL7612BCSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 5 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7612BCSA-T FAQ
1.How can I place an order for ICL7612BCSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7612BCSA-T 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 ICL7612BCSA-T reliable?
The price and inventory of ICL7612BCSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7612BCSA-T is usually 5 days.
3.What payment methods are accepted for ICL7612BCSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7612BCSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7612BCSA-T?
ICL7612BCSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7612BCSA-T 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 ICL7612BCSA-T?
For technical support, including ICL7612BCSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7612BCSA-T requirements.
6.How does Aetrix verify that ICL7612BCSA-T is sourced from the original manufacturer or authorized distributors?
All ICL7612BCSA-T 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 ICL7612BCSA-T meets industry standards.
7.What is the process for return or replacement of ICL7612BCSA-T?
All ICL7612BCSA-T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7612BCSA-T, 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 ICL7612BCSA-T part is unused and in its original packaging.
Return procedure for ICL7612BCSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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