Part A
AMC3330QDWERQ1
德州儀器
- Lifecycle
- Active
- Stock
- 3759 件
- Package
- SOIC-16
- Series
- 線性放大器-專用
Replacement verdict
Compatible functional replacement candidate
The AMC3330QDWERQ1 and AMC3302DWE are both isolated delta-sigma modulators with integrated DC/DC converters in the same SOIC-16 package, sharing a common functional architecture and pinout family. However, they differ in input voltage range, gain configuration, and qualification grade, so the AMC3302DWE can serve as a functional substitute for the AMC3330QDWERQ1 only after validating the input signal range and gain requirements against the target application.
Package Type
High match
Input Voltage Range
Validation required
Gain Configuration
Validation required
Qualification Grade
Validation required
Parts at a glance
Part B
AMC3302DWE
德州儀器
- Lifecycle
- Active
- Stock
- 3709 件
- Package
- SOIC-16
- Series
- 線性放大器-專用
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AMC3330QDWERQ1 | AMC3302DWE | Why it matters |
|---|---|---|---|
| Input Voltage Range | ±1 V (fully differential) | ±50 mV (fully differential) | Defines the maximum signal swing the isolated amplifier can accept; the AMC3330 supports much larger input signals than the AMC3302, so they are not directly interchangeable for high-voltage sensing. |
| Fixed Gain | 2 V/V | 41 V/V | Gain determines the output scaling relative to input; a 2 V/V versus 41 V/V gain means the two parts produce very different output amplitudes for the same input, affecting downstream ADC scaling. |
| Input Offset Voltage (max) | ±0.5 mV | ±50 µV | Offset error directly limits measurement accuracy; the AMC3302 offers significantly lower offset, which matters for precision low-level current sensing. |
| Input Bias Current | ±30 nA (typ) | ±25 µA (typ) | Bias current interacts with source impedance to create error; the AMC3330 has much lower bias current, making it better suited to higher-impedance sources. |
| Isolation Rating | Reinforced, 5 kV RMS (per datasheet) | Reinforced, 5 kV RMS (per datasheet) | Isolation rating governs safety and creepage/clearance compliance; both parts share the same reinforced isolation level, so this parameter does not differentiate them. |
| Supply Voltage (High Side) | 3.0 V to 5.5 V | 3.0 V to 5.5 V | Determines compatibility with the isolated-side power rail; identical ranges mean either part can operate from the same high-side supply. |
| Supply Voltage (Low Side) | 3.0 V to 5.5 V | 3.0 V to 5.5 V | Sets the logic-side interface voltage; matching ranges allow drop-in use with the same controller-side supply. |
| Bandwidth | 330 kHz (typ) | 330 kHz (typ) | Bandwidth limits the maximum signal frequency that can be accurately amplified; equal bandwidth means similar dynamic response for both parts. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Defines the environmental envelope for reliable operation; identical ranges mean both parts suit the same industrial temperature conditions. |
| Package | 16-pin SOIC (DWE) | 16-pin SOIC (DWE) | Package and pinout affect PCB layout and footprint compatibility; matching packages allow the same board design to accommodate either part. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AMC3330QDWERQ1 | AMC3302DWE |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Active |
| Type | Isolation Amplifier | Isolated |
| Applications | - | Driver |
| Mounting Type | Surface Mount | Surface Mount |
| Series | Automotive, AEC-Q100 | - |
Frequently asked questions
What are the key differences between the AMC3330QDWERQ1 and the AMC3302DWE?
The AMC3330QDWERQ1 is an automotive-qualified (AEC-Q100 Grade 1) isolated amplifier with a ±1 V input range and a fixed gain of 2, while the AMC3302DWE is a non-automotive isolated amplifier with a ±50 mV input range and a fixed gain of 41. Both are single-channel, reinforced isolated amplifiers in a 16-pin SOIC (DWE) package with integrated DC/DC converters, but they differ in input range, gain, and qualification grade.
Are the AMC3330QDWERQ1 and AMC3302DWE pin-to-pin compatible?
Yes. Both devices are offered in the same 16-pin SOIC (DWE) package and share the same pinout, including VDD1, VDD2, INP, INN, OUTP, OUTN, and the integrated isolated DC/DC converter pins. This allows a common PCB land pattern, though the differing input range and gain must be accounted for in the signal chain design.
What is the input voltage range of each device?
The AMC3330QDWERQ1 has a specified input voltage range of ±1 V, making it suitable for higher-voltage shunt or voltage-sense applications. The AMC3302DWE has a much smaller input range of ±50 mV, which is intended for low-side shunt current sensing where the shunt voltage drop is small.
What is the fixed gain of each amplifier?
The AMC3330QDWERQ1 provides a fixed gain of 2, so a ±1 V input maps to a ±2 V differential output. The AMC3302DWE provides a fixed gain of 41, so a ±50 mV input maps to approximately ±2.05 V differential output. The gain difference directly affects the required shunt value and the ADC full-scale utilization.
Is the AMC3330QDWERQ1 automotive qualified, and is the AMC3302DWE?
The AMC3330QDWERQ1 is AEC-Q100 Grade 1 qualified and is intended for automotive applications with a temperature range of –40°C to +125°C. The AMC3302DWE is a standard industrial-grade device and is not AEC-Q100 qualified, so it should not be used in automotive safety or powertrain designs requiring automotive qualification.
Do both devices include an integrated isolated DC/DC converter?
Yes. Both the AMC3330QDWERQ1 and the AMC3302DWE integrate an isolated DC/DC converter that supplies the high-side circuitry from the low-side supply, eliminating the need for a separate isolated power supply. This is a key feature of the AMC330x family and simplifies isolated measurement designs.
What is the isolation rating of these devices?
Both devices are reinforced isolated amplifiers rated for 5 kV RMS isolation per UL 1577 and provide a working voltage suitable for reinforced isolation according to IEC 60747-17. Designers should confirm the specific isolation parameters and certification details in the respective manufacturer datasheets for the target application.
Can the AMC3302DWE be used as a drop-in replacement for the AMC3330QDWERQ1?
No, not as a direct drop-in replacement. Although the package and pinout are the same, the input range (±50 mV vs ±1 V) and gain (41 vs 2) differ significantly, so the shunt resistor, signal scaling, and ADC interface must be redesigned. Additionally, the AMC3302DWE is not automotive qualified, so it cannot replace the AMC3330QDWERQ1 in AEC-Q100-required applications.