MAA725 Operational Amplifier TO-5
The MAA725, also sold as μA725 and LM725 equivalents, is a precision instrumentation operational amplifier in a rugged TO‑5 metal can (TO‑99‑8) package. It supports a wide supply range up to ±22 V with extremely low input bias current (~2 nA typical) and high open-loop gain (≈3×10⁶), offering outstanding performance for low-noise sensor applications and precision analog systems. The TO‑5 can provides excellent thermal stability and compatibility with vintage or replacement boards using the classic metal-flanged package.
Features
- Wide ±3 V to ±22 V supply voltage range.
- Ultra-low input bias current (~2 nA typical).
- High open-loop voltage gain (~3,000,000 V/V).
- Excellent common-mode rejection ratio (~120 dB).
- Low drift: ~0.6 µV/°C input offset drift.
- Hermetic TO‑5 (TO‑99‑8) metal can package for robust mechanical and thermal performance.
- Offset null capability and short-circuit protected outputs.
Specification
Absolute Maximum Ratings
| Parameter | Symbol | Limit | Unit |
|---|---|---|---|
| Supply Voltage | UB | ±3 to ±22 | V |
| Input Differential Voltage | UID | ±22 | |
| Input Voltage (MAA725, B, C) | UI | ±20 | |
| Voltage between Pins 1 & 7 or 8 & 7 | U1/7, U8/7 | ±0.5 | |
| Power Dissipation (Ta < 75 °C) | Ptot | 500 | mW |
| Operating Temperature | Ta | −55 to +125 | °C |
| Storage Temperature | Tstg | −65 to +150 |
Notes:
- Differential pulses up to 5 ms at 10% duty; for DC operation, the allowable differential input falls to ±5 V.
- For supply magnitude below ±22 V, reduce absolute input limits accordingly (e.g., at ±16 V supply, input limit is ±15 V; at ±5 V supply, input limit is ±4 V).
Electrical Characteristics (Ta = 25 °C, UB = ±15 V)
| Parameter | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Input Offset Voltage (RS ≤ 10 kΩ) |
UI0 | 0.5 | — | 1 | mV |
| Input Offset Current | II0 | 2 | — | 20 | nA |
| Input Bias Current | IB | 53 | — | 100 | |
| Input Noise Voltage (effective) Δf = 10 Hz–15 kHz, RS = 10 kΩ |
Uin ef | — | 1 | — | µV |
| Input Resistance f = 1 kHz |
RI | — | 1.5 | — | MΩ |
| Input Voltage Range | UI | ±13.5 | — | ±4 | V |
| Open-Loop Voltage Gain RL ≥ 2 kΩ, UO = ±10 V |
Au | 1·106 | — | 3·106 | |
| Common-Mode Rejection Ratio RS ≤ 10 kΩ |
CMR | 110 | — | 120 | dB |
| Supply Voltage Rejection RS ≤ 10 kΩ |
SVR | 4 | — | 10 | µV/V |
| Maximum Output Voltage Swing RS ≥ 10 kΩ |
UOPP max | ±12 | — | ±13.5 | V |
| Output Resistance f = 1 kHz |
RO | — | 150 | — | Ω |
| Supply Current | P | 85 | — | 105 | mW |
Dimensions
Applications
- Precision sensor instrumentation (strain gauges, thermocouples).
- Analog signal conditioning in industrial and aerospace systems.
- Vintage and legacy precision amplifier replacement.
- Low-drift, low-noise analog front ends.
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