Part A
ADS8556IPMR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2848 PCS
- Package
- LQFP-64
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8556IPM and ADS8556IPMR are functionally equivalent, sharing identical silicon, channel count, resolution, package, and temperature grade; the only distinction is the tape-and-reel packaging of the IPMR variant. The IPMR can serve as a direct drop-in replacement for the IPM in automated assembly flows, with no electrical or footprint redesign required.
Function and Resolution
High match
Package and Footprint
High match
Operating Temperature Range
High match
Packaging Format
High match
Parts at a glance
Part B
ADS8556IPM
Texas Instruments
- Lifecycle
- Active
- Stock
- 6944 PCS
- Package
- LQFP-64
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS8556IPM | ADS8556IPMR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the quantization step and achievable accuracy of the ADC; identical resolution means equivalent measurement precision. |
| Number of Channels | 6 (single-ended) / 3 (differential) | 6 (single-ended) / 3 (differential) | Defines how many analog signals can be sampled; matching channel count ensures the same system-level signal acquisition capability. |
| Sampling Rate | 630 kSPS | 630 kSPS | Sets the maximum signal bandwidth that can be captured; identical rate means the same throughput performance in the application. |
| Supply Voltage (Analog) | 5 V | 5 V | Determines the analog input range and interface compatibility; matching analog supply ensures the same signal chain design works. |
| Supply Voltage (Digital) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Affects logic-level compatibility with the host processor; identical range allows the same digital interface design. |
| Interface Type | Parallel / Serial (SPI) | Parallel / Serial (SPI) | Determines how the ADC connects to the controller; matching interfaces ensure drop-in compatibility with the existing host design. |
| Package / Mounting | 64-LQFP | 64-LQFP | Defines the PCB footprint and assembly process; identical package allows the same board layout to be used. |
| Packaging / Reel | Tray | Tape & Reel | Affects manufacturing handling and pick-and-place assembly; the reel version suits high-volume automated production while the tray suits low-volume or prototyping. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Defines the environmental conditions the device can operate in; identical range ensures the same reliability in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8556IPMR | ADS8556IPM |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 630k | 630k |
| Number of Inputs | 6 | 6 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | SPI, Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Features | Simultaneous Sampling | Simultaneous Sampling |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What is the difference between ADS8556IPM and ADS8556IPMR?
The ADS8556IPM and ADS8556IPMR are the same silicon device (Texas Instruments ADS8556, a 16-bit, 6-channel, simultaneous-sampling SAR ADC). The suffix difference is packaging/ordering: "IPM" denotes the tray (bulk) packaging option, while "IPMR" denotes the tape-and-reel packaging option. Both are supplied in the same 64-pin LQFP (PM) package and share identical electrical specifications.
Are the ADS8556IPM and ADS8556IPMR electrically and functionally identical?
Yes. Both orderable part numbers correspond to the same ADS8556 device in the 64-pin LQFP package with the same temperature grade (industrial, -40°C to +125°C). Resolution, channel count, sampling rate, interface, and all datasheet parameters are identical; only the shipping media (tray vs. tape-and-reel) differs.
Can ADS8556IPMR be used as a drop-in replacement for ADS8556IPM on an existing PCB?
Yes, from a footprint and electrical standpoint. Both are the same 64-pin LQFP (PM) package with identical pinout and land pattern, so no PCB redesign is required. The only practical consideration is the assembly process: tape-and-reel (IPMR) is intended for automated pick-and-place lines, while tray (IPM) is typically used for low-volume or manual assembly.
Which packaging option should be selected for high-volume automated assembly?
ADS8556IPMR (tape-and-reel) is the appropriate choice for high-volume automated SMT assembly, as tape-and-reel media is designed for pick-and-place feeders. ADS8556IPM (tray) is generally preferred for prototyping, low-volume runs, or manual handling.
Do ADS8556IPM and ADS8556IPMR share the same operating temperature range and package?
Yes. Both are specified for the industrial temperature range of -40°C to +125°C and are housed in the same 64-pin LQFP (PM) package, per the Texas Instruments ADS8556 datasheet.
Are ADS8556IPM and ADS8556IPMR RoHS-compliant and lead-free?
Both orderable part numbers are offered as Green/RoHS-compliant, lead-free (Pb-free) devices in the LQFP package, consistent with Texas Instruments' published product status for the ADS8556 family. Designers should confirm the current compliance status on the TI product page or distributor listing at time of purchase.
What are the key shared specifications of the ADS8556IPM and ADS8556IPMR?
Both are 16-bit, 6-channel, simultaneous-sampling SAR analog-to-digital converters with a maximum throughput of 630 kSPS per channel (parallel interface) and 450 kSPS (serial interface), an internal reference, and a 5 V analog supply with flexible digital I/O. These parameters are identical for both orderable part numbers because they are the same device.
Does the choice between ADS8556IPM and ADS8556IPMR affect lead time or minimum order quantity?
Yes, potentially. Because IPM is tray packaging and IPMR is tape-and-reel, distributors typically list different minimum order quantities, reel sizes, and stock/lead-time profiles for each. Buyers should verify current MOQ and availability for each specific orderable part number with the distributor.