Part A
AM1808EZWTA3
德州儀器
- Lifecycle
- Active
- Stock
- 4875 件
- Package
- NFBGA-361
- Series
- 嵌入式微處理器
Replacement verdict
Compatible functional replacement candidate
The AM1806BZCE3 is a viable functional replacement candidate for the AM1808EZWTA3 in designs that do not require the AM1808's extended feature set, since both share the same ARM926EJ-S core, package footprint, and industrial temperature range, though the reduced on-chip memory, absence of an LCD controller, and lower maximum clock speed of the AM1806 must be validated against the target application.
Core Architecture
Validation required
On-Chip Memory
Not compatible
Display Interface
Validation required
Package Type
High match
Parts at a glance
Part B
AM1806BZCE3
德州儀器
- Lifecycle
- Active
- Stock
- 2687 件
- Package
- LFBGA-361
- Series
- 嵌入式微處理器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AM1808EZWTA3 | AM1806BZCE3 | Why it matters |
|---|---|---|---|
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both use the same ARM926EJ-S core, so instruction set and software compatibility are identical. |
| Max Clock Frequency | 456 MHz | 375 MHz | A higher maximum clock allows more processing throughput; the AM1808 can run faster than the AM1806. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +90°C | The wider temperature range of the AM1808 suits harsher industrial environments, while the AM1806 is limited to a narrower range. |
| Package / Case | 361-LFBGA (16x16) | 361-LFBGA (16x16) | Identical package and footprint allow drop-in board-level substitution without layout changes. |
| On-Chip RAM | 128KB | 128KB | Matching internal SRAM means the same firmware memory map and buffer allocations can be reused. |
| Number of I/O | Up to 144 | Up to 144 | Equal GPIO count supports the same peripheral connections and board wiring. |
| Supply Voltage | 1.2V core / 1.8V, 3.3V I/O | 1.2V core / 1.8V, 3.3V I/O | Same voltage rails mean the existing power supply design can be reused without modification. |
| Ethernet MAC | 10/100 Mbps EMAC | 10/100 Mbps EMAC | Both integrate an Ethernet MAC, so networking functionality is preserved across the substitution. |
| USB Ports | 2 (USB 2.0 OTG + Host) | 2 (USB 2.0 OTG + Host) | Matching USB capability ensures the same host/device connectivity options remain available. |
| LCD Controller | Integrated LCD controller | Integrated LCD controller | Both include an on-chip LCD controller, so display-driving functionality is equivalent. |
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 | AM1808EZWTA3 | AM1806BZCE3 |
|---|---|---|
| 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 | 375MHz | 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 ~ 105°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 AM1808EZWTA3 and AM1806BZCE3?
The AM1808EZWTA3 is based on the AM1808 Sitara ARM microprocessor featuring an ARM926EJ-S core, while the AM1806BZCE3 is based on the AM1806 Sitara ARM microprocessor with the same ARM926EJ-S core. The primary differences lie in their feature sets: the AM1808 includes a display subsystem and additional peripherals such as an LCD controller and uPP (universal parallel port), whereas the AM1806 omits the display subsystem and certain connectivity peripherals. Both are packaged in a 361-ball NFBGA (ZWT/ZCE) and operate at commercial temperature grades, but the specific speed grade and peripheral integration differ between the two part numbers.
Are the AM1808EZWTA3 and AM1806BZCE3 pin-compatible?
Both devices are offered in a 361-ball NFBGA package (ZWT and ZCE suffixes respectively), and Texas Instruments designed the AM1808 and AM1806 families to share a common package footprint. However, pin compatibility is not guaranteed for all balls because the AM1808 exposes additional peripheral signals (such as LCD and uPP interfaces) that are not present on the AM1806. Designers must verify the pinout against the respective datasheets before considering a board-level swap.
What is the core architecture and clock speed of these devices?
Both the AM1808EZWTA3 and AM1806BZCE3 integrate an ARM926EJ-S RISC core. The AM1808EZWTA3 is specified at a 375 MHz maximum operating frequency (the "A3" speed grade), while the AM1806BZCE3 is specified at a 300 MHz maximum operating frequency (the "3" speed grade). Both cores include 16 KB instruction and 16 KB data caches, a 32 KB shared RAM, and an MMU supporting Linux and other operating systems.
Do these devices include on-chip memory and what type?
Yes. Both the AM1808 and AM1806 integrate 128 KB of on-chip ARM RAM (shared memory) and 8 KB of ARM ROM. Neither device includes embedded flash memory, so external non-volatile memory (such as NAND, NOR, or SPI flash) must be provided on the board for boot and code storage. Both support booting from external memory, UART, SPI, and other interfaces per the device boot modes.
What are the operating temperature ranges for the AM1808EZWTA3 and AM1806BZCE3?
Both the AM1808EZWTA3 and AM1806BZCE3 are rated for the commercial temperature range of 0°C to 70°C (case temperature). The "A3" and "3" suffixes in the part numbers denote the 375 MHz and 300 MHz speed grades respectively, not extended temperature variants. Designs requiring industrial temperature operation must select the corresponding industrial-grade orderable part numbers from the AM1808/AM1806 family.
What peripheral interfaces are available on each device?
Both devices share a common peripheral set including USB 2.0 OTG with integrated PHY, 10/100 Ethernet MAC (EMAC), three UARTs, two SPI ports, two I2C ports, McASP, and multiple timers. The AM1808EZWTA3 additionally integrates an LCD controller and a universal parallel port (uPP), which are not available on the AM1806BZCE3. Both include an external memory interface (EMIFA) supporting SDRAM and asynchronous memories such as NAND and NOR flash.
Can the AM1806BZCE3 be used as a drop-in replacement for the AM1808EZWTA3?
No, the AM1806BZCE3 is not a drop-in replacement for the AM1808EZWTA3. Although both share the ARM926EJ-S core and 361-ball NFBGA package, the AM1806 lacks the LCD controller and uPP peripherals present on the AM1808, and it operates at a lower maximum frequency (300 MHz versus 375 MHz). A design migration requires reviewing the pinout, peripheral usage, and timing requirements against the AM1806 datasheet, and any software relying on the AM1808-specific peripherals must be modified.
What software and operating system support is available for these processors?
Both the AM1808 and AM1806 are supported by Texas Instruments' Sitara software ecosystem, including Linux (via the TI SDK and community mainline support), TI-RTOS, and StarterWare (now part of the Processor SDK). Because both devices share the ARM926EJ-S core and much of the peripheral architecture, much of the low-level software is common, but drivers for the AM1808-specific LCD controller and uPP are not applicable to the AM1806. Developers should consult the Processor SDK release notes for the exact supported devices and versions.