Part A
AMC1304M25DWR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2290 個数
- Package
- SOIC-16
- Series
- データ取得 - ADC/DAC - 特殊用途向け
Replacement verdict
Not a drop-in replacement
The AMC1304M25DWR and AMC1302DWV are both isolated delta-sigma modulator amplifiers, but they differ fundamentally in input architecture, isolation rating, package footprint, and output interface, so neither part can serve as a direct drop-in substitute for the other without circuit redesign and revalidation.
Different input architecture
Different isolation rating
Different package footprint
Different output interface
Parts at a glance
Part B
AMC1302DWV
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 5151 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 特殊用途
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AMC1304M25DWR | AMC1302DWV | Why it matters |
|---|---|---|---|
| Input Type | Current (shunt-based, isolated) | Current (shunt-based, isolated) | Both are isolated current-sense amplifiers, but their input architectures differ, affecting how they interface with shunt resistors and signal chains. |
| Isolation Rating | 5000 Vrms (reinforced) | 5000 Vrms (reinforced) | Reinforced isolation is critical for safety and noise immunity in high-voltage motor drive and power conversion applications. |
| Output Interface | Delta-sigma modulator (bitstream) | Analog differential output | The output format determines whether the downstream device needs a digital filter/decoder (modulator) or an ADC (analog output), directly affecting system architecture. |
| Input Voltage Range | ±250 mV | ±50 mV | The full-scale input range dictates the shunt resistor value and the measurable current span, so a different range changes the sensing design. |
| 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) | Compatible supply ranges allow both parts to operate from common 3.3 V or 5 V rails, simplifying power design. |
| Gain | Fixed (modulator, gain defined by full-scale ±250 mV) | Fixed gain of 41 | Gain determines the output scaling relative to the shunt voltage; a fixed analog gain versus a modulator full-scale changes signal conditioning requirements. |
| Package | SOIC-16 (wide body) | SOIC-8 (wide body) | Package footprint and pin count affect PCB layout, creepage/clearance, and whether a drop-in replacement is possible. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Industrial temperature range ensures reliable operation in harsh motor drive and power supply environments. |
| Bandwidth | Modulator clock dependent (up to ~20 MHz clock) | ~100 kHz (typical) | Bandwidth affects the ability to capture fast current transients; modulator-based parts offer higher effective bandwidth with appropriate digital filtering. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AMC1304M25DWR | AMC1302DWV |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Active |
| Type | Isolated Module | Isolation |
| Applications | - | Current Sensing, Power Management |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Channels | 1 | - |
| Resolution(Bits) | 16 b | - |
| Sampling Rate(Per Second) | 78k | - |
| Data Interface | CMOS, Serial | - |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 3V ~ 5.5V | - |
| Operating Temperature | -40°C ~ 125°C | - |
Frequently asked questions
What are the primary functional differences between the AMC1304M25DWR and the AMC1302DWV?
The AMC1304M25DWR is a precision, isolated delta-sigma modulator with a ±250 mV input range and an integrated low-dropout regulator (LDO), designed for direct shunt-resistor current sensing. The AMC1302DWV is an isolated amplifier with a ±50 mV input range and a fixed gain of 41, intended for shunt-based current sensing where a differential output is required. The AMC1304M25DWR outputs a 1-bit delta-sigma bitstream, while the AMC1302DWV provides an analog differential output voltage.
Are the AMC1304M25DWR and AMC1302DWV pin-to-pin or package compatible?
No. The AMC1304M25DWR is supplied in an 8-pin SOIC package (DWR suffix, wide-body), while the AMC1302DWV is supplied in an 8-pin SOIC package (DWV suffix, wide-body). Although both are 8-pin wide-body SOIC devices, the pin functions differ: the AMC1304M25DWR includes LDO and clock-related pins, whereas the AMC1302DWV has a different pin assignment for its analog output and gain-setting configuration. They are not direct drop-in replacements.
Can the AMC1304M25DWR and AMC1302DWV be used interchangeably in a current-sensing design?
No, they are not interchangeable without redesign. The AMC1304M25DWR requires a digital decimation filter (e.g., in an MCU or FPGA) to reconstruct the measured current from its delta-sigma bitstream, and its ±250 mV input range suits higher shunt voltages. The AMC1302DWV provides an analog differential output that can be fed directly to an ADC, and its ±50 mV input range requires a lower shunt voltage drop. The signal chain, input range, and output interface differ, so substitution requires validating the entire measurement path.
What are the input voltage ranges of the AMC1304M25DWR and AMC1302DWV?
The AMC1304M25DWR has a specified input voltage range of ±250 mV (linear input range) for its isolated modulator front end. The AMC1302DWV has a specified input voltage range of ±50 mV. These ranges determine the maximum shunt resistor voltage drop each device can accept before saturation or nonlinearity, so the shunt value and gain must be selected accordingly.
Do both devices provide galvanic isolation, and what isolation rating do they carry?
Yes, both are isolated devices intended for shunt-based current sensing with galvanic isolation between the high-voltage and low-voltage sides. The AMC1304M25DWR and AMC1302DWV are both specified with a reinforced isolation rating of 5 kVRMS (per the respective manufacturer datasheets) and are qualified to relevant isolation standards. Designers should confirm the exact isolation parameters (working voltage, transient immunity) from the specific manufacturer datasheet for the target application.
What output interface does each device provide to the system controller?
The AMC1304M25DWR provides a 1-bit delta-sigma modulated bitstream output at a clock frequency determined by the external clock input, which must be processed by a digital filter (sinc filter) in an MCU or FPGA. The AMC1302DWV provides an analog differential output voltage proportional to the input, which can be connected directly to a differential ADC input or an instrumentation amplifier stage. The choice affects the digital processing burden and the analog front-end design.
Which device is better suited for high-precision motor drive or servo current sensing?
Both are used in motor drive and servo current sensing, but the selection depends on the system architecture. The AMC1304M25DWR, with its delta-sigma output and ±250 mV range, is often chosen when the controller already includes a delta-sigma demodulator/filter and when a wider shunt voltage is desired. The AMC1302DWV, with its analog differential output and ±50 mV range, suits designs that prefer a direct analog interface to an ADC with lower shunt voltage drop. Neither is universally "better"; the decision should be based on the controller interface, shunt value, and required accuracy, verified against the datasheets.
Do the AMC1304M25DWR and AMC1302DWV require external components for proper operation?
Yes, both require external components. The AMC1304M25DWR requires a decoupling capacitor on its LDO output and supply pins, and a digital filter on the controller side to process the bitstream. The AMC1302DWV requires supply decoupling and, depending on the application, an RC filter on its differential output before the ADC. The exact recommended external component values and layout guidance are specified in the respective manufacturer datasheets and should be followed.