Part A
AM1808BZWTD4
Texas Instruments
- Lifecycle
- Active
- Stock
- 1425 Stückzahl
- Package
- LFBGA-361
- Series
- Eingebettete Mikroprozessoren
Replacement verdict
Compatible functional replacement candidate
The AM1806BZCE3 is a functional replacement candidate for the AM1808BZWTD4 only within the shared 375 MHz speed grade and 1.2 V core domain; the AM1808BZWTD4 offers a higher 456 MHz core clock, extended commercial temperature range, and additional on-chip memory and peripherals that the AM1806BZCE3 does not provide, so system-level validation of clock-dependent peripherals, memory footprint, and thermal margin is required before substitution.
Core Clock Frequency
Validation required
Package Type
High match
Operating Temperature Range
Validation required
On-Chip Memory and Peripheral Set
Not compatible
Parts at a glance
Part B
AM1806BZCE3
Texas Instruments
- Lifecycle
- Active
- Stock
- 2687 Stückzahl
- Package
- LFBGA-361
- Series
- Eingebettete Mikroprozessoren
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM1808BZWTD4 | AM1806BZCE3 | Why it matters |
|---|---|---|---|
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both use the same ARM926EJ-S core, so instruction set and software compatibility are preserved. |
| Max Clock Frequency | 456 MHz | 375 MHz | A higher maximum clock allows more processing throughput; the AM1808 can run faster than the AM1806. |
| Package / Case | 361-LFBGA (16x16) | 361-LFBGA (16x16) | Identical package and footprint enable drop-in board-level substitution without layout changes. |
| Operating Temperature Range | -40°C to 90°C (TJ) | -40°C to 90°C (TJ) | Matching temperature grades ensure equivalent environmental robustness for industrial applications. |
| On-Chip RAM | 128KB | 128KB | Equal internal SRAM supports the same firmware buffering and stack requirements. |
| Ethernet MAC | 10/100 Mbps EMAC | 10/100 Mbps EMAC | Both integrate an Ethernet MAC, preserving networking capability without external controllers. |
| USB Ports | 2 (1x USB 2.0 OTG, 1x USB 1.1 Host) | 2 (1x USB 2.0 OTG, 1x USB 1.1 Host) | Identical USB configuration maintains peripheral connectivity options for both parts. |
| LCD Controller | Yes (integrated LCD controller) | No | The AM1808 includes an LCD controller while the AM1806 does not, so display-driving applications cannot substitute directly. |
| UART / SPI / I2C Interfaces | 3x UART, 2x SPI, 2x I2C | 3x UART, 2x SPI, 2x I2C | Matching serial interface counts ensure equivalent peripheral expansion and sensor connectivity. |
| Supply Voltage (Core) | 1.2 V | 1.2 V | Same core voltage simplifies power supply design and allows reuse of the existing power tree. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM1808BZWTD4 | AM1806BZCE3 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Series | Sitara™ | Sitara™ |
| Part Status | Obsolete | 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) | 0°C ~ 90°C (TJ) |
| Ethernet | 10/100Mbps (1) | - |
| SATA | SATA 3Gbps (1) | - |
Frequently asked questions
What are the key differences between the AM1808BZWTD4 and AM1806BZCE3?
The AM1808BZWTD4 is an ARM926EJ-S based Sitara processor running at 456 MHz in a 361-pin NFBGA (ZWT) package, while the AM1806BZCE3 is a lower-tier variant running at 375 MHz in a 361-pin NFBGA (ZCE) package. The AM1808BZWTD4 includes an LCD controller and a SATA controller, whereas the AM1806BZCE3 omits the LCD controller and SATA interface. Both share the same ARM926EJ-S core, 128 KB on-chip RAM, and peripherals such as USB 2.0, EMAC, and McASP, but the AM1808 offers additional display and storage connectivity.
Are the AM1808BZWTD4 and AM1806BZCE3 pin-to-pin compatible?
No. Although both devices use a 361-pin NFBGA package, the AM1808BZWTD4 uses the ZWT package designation and the AM1806BZCE3 uses the ZCE package designation. The pinouts differ because the AM1808 exposes LCD and SATA signals that are not present on the AM1806. A direct PCB drop-in replacement is not supported; the board layout and pin assignments must be validated against the respective datasheets.
What is the maximum operating frequency of each device?
The AM1808BZWTD4 is rated for a maximum ARM core frequency of 456 MHz. The AM1806BZCE3 is rated for a maximum ARM core frequency of 375 MHz. These figures are specified in the respective Texas Instruments datasheets and reflect the speed grade indicated by the device part number suffix.
Do both devices include an LCD controller and SATA interface?
No. The AM1808BZWTD4 integrates an LCD controller and a SATA controller, making it suitable for applications requiring display output and mass storage. The AM1806BZCE3 does not include the LCD controller or the SATA interface; it is intended for designs that do not require those peripherals. This is a primary functional differentiator between the two parts.
What memory and peripheral interfaces do both devices share?
Both the AM1808BZWTD4 and AM1806BZCE3 share the ARM926EJ-S core, 128 KB of on-chip RAM, a 16-bit DDR2/mDDR memory controller, and a 16-bit asynchronous EMIF (uPP/AEMIF). Common peripherals include USB 2.0 OTG and host, 10/100 Ethernet MAC (EMAC), McASP, SPI, I2C, UART, and eHRPWM. These shared blocks allow similar baseline system architectures, with differences limited to the LCD and SATA blocks on the AM1808.
What are the operating temperature ranges for these two processors?
The AM1808BZWTD4 is specified for the commercial temperature range of 0°C to 70°C (the "D" speed/grade suffix corresponds to the commercial temperature variant in the ZWT package). The AM1806BZCE3 is specified for the extended temperature range of -40°C to 90°C (the "E" suffix denotes extended temperature). Designers should confirm the exact temperature grade against the ordering information in the Texas Instruments datasheet before finalizing thermal design.
Can the AM1806BZCE3 be used as a drop-in replacement for the AM1808BZWTD4?
No. The AM1806BZCE3 lacks the LCD controller and SATA interface present on the AM1808BZWTD4, and the package pinout (ZCE vs ZWT) differs. Additionally, the maximum core frequency is lower (375 MHz vs 456 MHz). A replacement requires schematic and layout changes, revalidation of peripheral usage, and confirmation that the reduced feature set and speed grade meet the application requirements.
Which device is better suited for battery-powered or extended-temperature applications?
The AM1806BZCE3 is the more suitable choice for extended-temperature environments because it is rated for -40°C to 90°C, whereas the AM1808BZWTD4 is rated for 0°C to 70°C. For battery-powered designs, both devices share low-power ARM926EJ-S architecture and similar peripheral sets, but the AM1806BZCE3 omits the LCD and SATA blocks, which can reduce overall power consumption in systems that do not require those functions. Final power figures should be taken from the respective datasheets.