Part A
AMC3302DWER
德州儀器
- Lifecycle
- Active
- Stock
- 8913 件
- Series
- 線性放大器-專用放大器
Replacement verdict
Compatible functional replacement candidate
The AMC3330DWER and AMC3302DWER share the same isolated amplifier architecture, package footprint, and supply structure, making them viable functional replacement candidates. However, the AMC3302DWER offers a higher input voltage range and improved gain error specification, so designers should validate gain accuracy and input signal swing against the target application before substituting one for the other.
Package Type
High match
Isolation Rating
High match
Input Voltage Range
Validation required
Gain Error
Validation required
Parts at a glance
Part B
AMC3330DWER
德州儀器
- Lifecycle
- Active
- Stock
- 3848 件
- Package
- SOIC-16
- Series
- 專用集成電路
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AMC3330DWER | AMC3302DWER | Why it matters |
|---|---|---|---|
| Input Type | Voltage input (isolated amplifier) | Current shunt input (isolated amplifier) | Determines whether the device measures a voltage directly or a shunt-derived current signal, which fundamentally changes the sensing circuit topology. |
| Input Voltage Range | ±1 V (differential) | ±50 mV (differential) | The full-scale input span must match the sensed signal amplitude; a ±50 mV device cannot directly accept a ±1 V signal without attenuation. |
| Fixed Gain | 2 V/V | 41 V/V | Gain sets the output-to-input scaling; the large difference means the two parts are not drop-in substitutes for the same signal chain. |
| Input Offset Error | ±0.3 mV (max) | ±50 µV (max) | Offset error directly limits DC measurement accuracy; the current-sense variant requires much lower offset for small shunt voltages. |
| Input Bias Current | ±3.5 nA (typ) | ±25 µA (typ) | Bias current interacts with source impedance and affects error, especially for high-impedance voltage sensing versus low-impedance shunt sensing. |
| Common-Mode Input Range | ±1 V | ±320 mV | Defines the allowable common-mode voltage at the input; mismatched ranges prevent direct substitution in a given sensing node. |
| Isolation Rating | 5 kV RMS (reinforced) | 5 kV RMS (reinforced) | Both provide equivalent reinforced galvanic isolation, so safety isolation capability is not a differentiator between them. |
| Supply Voltage | 3.0 V to 5.5 V (high side), 3.0 V to 5.5 V (low side) | 3.0 V to 5.5 V (high side), 3.0 V to 5.5 V (low side) | Identical supply requirements mean the same power rails can be reused, simplifying board-level substitution. |
| Package | 16-pin SOIC (DWE) | 16-pin SOIC (DWE) | Matching package and pinout allow the same PCB footprint, though electrical differences still prevent true interchangeability. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Equivalent temperature ratings ensure both parts suit the same industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AMC3302DWER | AMC3330DWER |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | AMC3302 | - |
| Type | Isolation | Isolated Amplifier |
| Applications | Driver | - |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What are the key differences between the AMC3330DWER and AMC3302DWER isolated amplifiers?
Both are reinforced isolated amplifiers in a 16-pin SOIC (DWE) package from Texas Instruments, but they differ in input configuration and gain. The AMC3330DWER integrates a fully differential input with a fixed gain of 1 V/V and an internal isolated DC-DC converter to power the high-side, while the AMC3302DWER has a ±50 mV shunt-input configuration with a fixed gain of 41 and also includes an integrated isolated DC-DC converter. The AMC3330 is intended for voltage-sensing applications, whereas the AMC3302 is optimized for shunt-based current sensing.
Are the AMC3330DWER and AMC3302DWER pin-to-pin compatible?
Both devices are offered in the same 16-pin SOIC (DWE) package, but pin-to-pin compatibility must be confirmed against the respective manufacturer datasheets, because pin functions and recommended external connections can differ between the voltage-input AMC3330 and the shunt-input AMC3302. Designers should verify each pin assignment before considering a direct board-level swap.
What is the input configuration of each device?
The AMC3330DWER provides a fully differential input intended for voltage sensing, with a nominal input range suitable for direct high-voltage measurement through external resistors. The AMC3302DWER provides a low-level differential input designed for shunt-resistor current sensing, with a nominal input range of approximately ±50 mV. The input structures are therefore not interchangeable without redesigning the sensing front end.
What gain does each amplifier provide?
The AMC3330DWER has a fixed gain of 1 V/V, making it suited to voltage-sensing signal chains. The AMC3302DWER has a fixed gain of 41 V/V, which amplifies the small differential voltage developed across a shunt resistor. Because the gains differ substantially, the output scaling and downstream ADC requirements differ between the two parts.
Do both devices include an integrated isolated DC-DC converter?
Yes. Both the AMC3330DWER and AMC3302DWER integrate an isolated DC-DC converter that supplies the high-side circuitry, eliminating the need for a separate isolated bias supply. This is a shared architectural feature of the two devices and simplifies the design of isolated measurement channels.
What isolation rating do the AMC3330DWER and AMC3302DWER provide?
Both devices are reinforced isolated amplifiers rated for a maximum isolation voltage of 5 kV RMS per the manufacturer's specifications, and both are qualified to the same reinforced isolation standard. Designers should still confirm the exact isolation parameters, such as working voltage and transient immunity, in the respective datasheets for the target application.
Which device should be selected for shunt-based current sensing versus voltage sensing?
For shunt-based current sensing, the AMC3302DWER is the appropriate choice because its ±50 mV input range and gain of 41 are matched to low-level shunt signals. For voltage sensing, the AMC3330DWER is appropriate because its fully differential input and unity gain are intended for measuring voltage directly. Selecting the wrong device would require additional signal conditioning and would not match the intended measurement range.
Can the AMC3330DWER and AMC3302DWER be used interchangeably in an existing design?
No. Although both share the same 16-pin SOIC (DWE) package and integrated isolated DC-DC converter, their input ranges, gains, and intended sensing functions differ. A direct substitution would change the measurement scaling and may not match the shunt or voltage-sense front end, so any replacement must be validated against the manufacturer datasheets and the target design requirements.