Part A
AM1808EZWTD4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4891 PCS
- Package
- NFBGA-361
- Series
- Embedidos - Microprocessadores
Replacement verdict
Compatible functional replacement candidate
The AM1806BZCEA3 is a viable functional replacement candidate for the AM1808EZWTD4 in applications where reduced on-chip memory and the absence of an external memory interface are acceptable. Both devices share the same ARM926EJ-S core, 375 MHz clock speed, and 361-ball NFBGA package, ensuring pin-compatible board design. However, the AM1806 offers only 128 KB of on-chip RAM versus 128 KB RAM plus 8 KB shared memory on the AM1808, and it lacks the uPP, SATA, and mDDR/DDR2 external memory controller present on the AM1808. Designers must validate memory architecture and peripheral requirements before substituting.
Core Architecture and Clock Speed
High match
Package and Pinout
High match
On-Chip Memory
Validation required
External Memory Interface
Not compatible
Parts at a glance
Part B
AM1806BZCEA3
Texas Instruments
- Lifecycle
- Active
- Stock
- 160 PCS
- Package
- LFBGA-361
- Series
- Embedidos - Microprocessadores
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM1808EZWTD4 | AM1806BZCEA3 | Why it matters |
|---|---|---|---|
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both use the same ARM926EJ-S core, so instruction set and software compatibility are preserved. |
| Maximum Clock Frequency | 456 MHz | 375 MHz | A lower maximum clock reduces processing throughput, which can affect timing-critical applications. |
| Package / Case | 361-LFBGA (16x16) | 361-NFBGA (13x13) | Different package footprints and ball maps require board redesign and are not drop-in compatible. |
| Operating Temperature Range | -40°C to 90°C (TJ) | -40°C to 105°C (TJ) | The wider temperature range of the AM1806BZCEA3 suits harsher environments and affects thermal design margins. |
| On-Chip RAM | 128KB | 128KB | Identical on-chip SRAM supports the same internal buffering and code execution strategies. |
| Ethernet MAC | 10/100 Mbps EMAC | 10/100 Mbps EMAC | Both integrate an Ethernet MAC, so networked applications remain feasible without external controllers. |
| USB Ports | 2 (USB 2.0 OTG + Host) | 2 (USB 2.0 OTG + Host) | Matching USB capability preserves peripheral connectivity options for both parts. |
| LCD Controller | Integrated LCD controller | Integrated LCD controller | Both support direct display interfacing, so HMI and display-based designs remain compatible. |
| Supply Voltage (Core) | 1.2V / 1.3V | 1.2V / 1.3V | Identical core voltage requirements allow reuse of the same power supply design. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM1808EZWTD4 | AM1806BZCEA3 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Series | Sitara™ | Sitara™ |
| Part Status | Active | Obsolete |
| Core Processor | ARM926EJ-S | ARM926EJ-S |
| Number of Cores / Bus Width | 1 Core, 32-Bit | 1 Core, 32-Bit |
| Speed | 456MHz | 375MHz |
| Co - Processors / DSP | System Control; CP15 | System Control; CP15 |
| RAM Controllers | LPDDR, DDR2 | LPDDR, DDR2 |
| Graphics Acceleration | No | No |
| Display&Interface Controllers | LCD | LCD |
| USB | USB 1.1 + PHY (1), USB 2.0 + PHY (1) | USB 2.0 + PHY (1) |
| Voltage - I / O | 1.8V, 3.3V | 1.8V, 3.3V |
| Operating Temperature | -40°C ~ 90°C (TJ) | -40°C ~ 105°C (TJ) |
| Ethernet | 10/100Mbps (1) | - |
| SATA | SATA 3Gbps (1) | - |
Frequently asked questions
What are the key differences between the AM1808EZWTD4 and AM1806BZCEA3?
The AM1808EZWTD4 is an ARM926EJ-S based Sitara processor running at 456 MHz in a 361-ball NFBGA (ZWT) package, while the AM1806BZCEA3 is an ARM926EJ-S based Sitara processor running at 375 MHz in a 361-ball NFBGA (ZCE) package. Both integrate an LCD controller, but the AM1808EZWTD4 supports the uPP (universal parallel port) and additional connectivity peripherals, whereas the AM1806BZCEA3 omits the uPP interface. Operating temperature grades also differ: the AM1808EZWTD4 is rated for the extended commercial/industrial range per its ZWT suffix, and the AM1806BZCEA3 is specified for the commercial temperature range per its ZCE suffix.
Are the AM1808EZWTD4 and AM1806BZCEA3 pin-to-pin compatible?
No. Although both devices use a 361-ball NFBGA package, the AM1808EZWTD4 uses the ZWT ball map and the AM1806BZCEA3 uses the ZCE ball map. The ball assignments and available peripheral signals differ between the two, so they are not drop-in replacements and require separate PCB layouts.
Do both devices share the same ARM core and instruction set?
Yes. Both the AM1808EZWTD4 and AM1806BZCEA3 are based on the ARM926EJ-S RISC core with ARMv5TEJ instruction set support, including the Jazelle Java acceleration and DSP extensions. Software compiled for one core architecture is generally portable to the other, subject to peripheral and clock differences.
What is the maximum operating frequency of each device?
The AM1808EZWTD4 is specified at 456 MHz, while the AM1806BZCEA3 is specified at 375 MHz. Designs migrating between the two must account for the reduced clock rate and any timing-dependent peripheral configurations when moving to the AM1806BZCEA3.
Which device includes the universal parallel port (uPP)?
The AM1808EZWTD4 integrates the uPP interface for high-speed parallel data transfer, while the AM1806BZCEA3 does not include the uPP. Systems requiring uPP connectivity must use the AM1808EZWTD4 or an external interface solution.
Do both processors include an LCD controller and Ethernet MAC?
Yes. Both the AM1808EZWTD4 and AM1806BZCEA3 integrate an LCD controller and a 10/100 Mbps Ethernet MAC, along with common peripherals such as USB, UART, SPI, I2C, and McASP. Peripheral counts and pin multiplexing options should be confirmed against the respective datasheets for a given design.
What are the operating temperature ranges for these two parts?
The AM1808EZWTD4 is specified for the extended temperature range associated with its ZWT suffix, and the AM1806BZCEA3 is specified for the commercial temperature range associated with its ZCE suffix. The exact junction and ambient limits should be verified in the respective manufacturer datasheets before use in a target environment.
Can the AM1806BZCEA3 directly replace the AM1808EZWTD4 in an existing design?
No. The different ball maps (ZCE versus ZWT), the absence of the uPP on the AM1806BZCEA3, and the lower 375 MHz maximum frequency mean a direct replacement is not possible. A redesign of the PCB layout and validation of peripheral usage and timing are required.