Part A
AD8236ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3436 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The AD8237ARMZ-R7 and AD8236ARMZ are both zero-drift instrumentation amplifiers in the same 8-lead MSOP package, but they differ in supply voltage range, quiescent current, and gain configuration. The AD8237ARMZ-R7 supports a wider supply range and lower quiescent current, while the AD8236ARMZ offers a fixed gain of 51. Designers should validate supply headroom, gain requirements, and power budget before substituting one for the other in a given application.
Supply Voltage Range
Validation required
Gain Configuration
Validation required
Package Type
High match
Quiescent Current
Validation required
Parts at a glance
Part B
AD8237ARMZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1608 Stückzahl
- Package
- MSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8237ARMZ-R7 | AD8236ARMZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Instrumentation Amplifier (indirect current mode) | Instrumentation Amplifier (micropower) | The architecture determines noise, input range, and gain-setting behavior, affecting whether the part fits a given signal chain. |
| Number of Channels | 1 | 1 | Both are single-channel, so channel count is not a differentiator for substitutability. |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | Compatible supply ranges allow the parts to operate in the same low-voltage systems. |
| Input Offset Voltage (max) | ±75 µV | ±250 µV | Lower offset improves DC accuracy; the AD8237 offers tighter offset for precision applications. |
| Input Offset Voltage Drift | 0.3 µV/°C (typ) | 2 µV/°C (typ) | Drift affects accuracy over temperature; the AD8237 is significantly more stable. |
| Input Bias Current | 1 pA (typ) | 1 pA (typ) | Very low bias current suits high-impedance sensors; both parts are comparable here. |
| Gain Setting | External resistors (indirect current mode) | Pin-selectable gains of 5, 10, 20, 40, 80, 160 | Fixed pin-selectable gains simplify design but limit flexibility, while external resistors allow arbitrary gain. |
| Supply Current per Amplifier | 130 µA (typ) | 50 µA (typ) | Lower quiescent current extends battery life; the AD8236 is better for ultra-low-power designs. |
| Input Voltage Noise Density | 68 nV/√Hz (typ, at 1 kHz) | 95 nV/√Hz (typ, at 1 kHz) | Lower noise improves resolution for small signals; the AD8237 provides better noise performance. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical temperature ratings mean both suit industrial and extended-temperature environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8236ARMZ | AD8237ARMZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Instrumentation | Instrumentation |
| Number of Circuits | 1 | 1 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 0.011V/µs | 0.15V/µs |
| -3 dB Bandwidth | 23 kHz | 200 kHz |
| Current - Input Bias | 1 pA | 250 pA |
| Voltage - Input Offset | 3.5 mV | 25 µV |
| Supply Current | 33µA | 115µA |
| Current - Output / Channel | 6 mA | 4 mA |
| Voltage - Supply Span(Min) | 1.8 V | 1.8 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key architectural differences between the AD8237ARMZ-R7 and the AD8236ARMZ?
The AD8237ARMZ-R7 is a micropower, zero-drift instrumentation amplifier with a rail-to-rail input and output, featuring a unique indirect current mode architecture. The AD8236ARMZ is a micropower instrumentation amplifier with a fixed gain of 5, also featuring rail-to-rail output. The AD8237ARMZ-R7 allows user-programmable gain via external resistors, whereas the AD8236ARMZ has a fixed gain configuration.
Are the AD8237ARMZ-R7 and AD8236ARMZ pin-compatible?
Both devices are offered in an 8-lead MSOP (RM) package. However, pin functions differ: the AD8237ARMZ-R7 uses the standard instrumentation amplifier pinout with gain-setting resistor pins (RG), while the AD8236ARMZ has a fixed gain of 5 and its pinout reflects internal gain-setting connections. They are not directly interchangeable without verifying the pin functions against the respective datasheets.
How do the supply voltage ranges compare between the AD8237ARMZ-R7 and AD8236ARMZ?
The AD8237ARMZ-R7 operates from a single supply of 1.8 V to 5.5 V (or dual supplies of ±0.9 V to ±2.75 V). The AD8236ARMZ operates from a single supply of 1.8 V to 5.5 V (or dual supplies of ±0.9 V to ±2.75 V). Both devices share the same supply voltage range.
What is the quiescent current consumption of each device?
The AD8237ARMZ-R7 typically draws 130 µA of quiescent current. The AD8236ARMZ typically draws 45 µA of quiescent current. The AD8236ARMZ is therefore better suited for lower-power applications, while the AD8237ARMZ-R7 offers greater gain flexibility.
How does the gain configuration differ between the AD8237ARMZ-R7 and AD8236ARMZ?
The AD8237ARMZ-R7 is a user-programmable gain instrumentation amplifier; gain is set by an external resistor connected between the RG pins, allowing a wide range of gains. The AD8236ARMZ has a fixed gain of 5, set internally, and does not require external gain resistors. This makes the AD8236ARMZ simpler to use where a gain of 5 is sufficient.
What are the input offset voltage specifications for the AD8237ARMZ-R7 and AD8236ARMZ?
The AD8237ARMZ-R7 features a maximum input offset voltage of 75 µV with a typical offset drift of 0.3 µV/°C, owing to its zero-drift architecture. The AD8236ARMZ has a maximum input offset voltage of 500 µV (referred to input) with typical drift of 2 µV/°C. The AD8237ARMZ-R7 provides superior DC precision.
Which device is more suitable for high-precision, low-drift sensor signal conditioning?
The AD8237ARMZ-R7 is generally more suitable for high-precision, low-drift applications due to its zero-drift architecture, lower maximum input offset voltage (75 µV), and lower offset drift (0.3 µV/°C typical). The AD8236ARMZ, with 500 µV maximum offset and 2 µV/°C typical drift, is adequate for less demanding precision applications where a fixed gain of 5 is acceptable.
Do both the AD8237ARMZ-R7 and AD8236ARMZ support rail-to-rail input and output?
Both devices feature rail-to-rail output swing. The AD8237ARMZ-R7 has a rail-to-rail input stage. The AD8236ARMZ input common-mode range extends from the negative supply to within approximately 0.1 V of the positive supply (per datasheet). Designers should verify input common-mode headroom requirements against the specific datasheet for each device.