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 AM1808EZWTA3 and AM1806BZCED4 are both Sitara ARM9-based applications processors from Texas Instruments sharing the same AM18x architecture, 375 MHz core clock, and 361-ball NFBGA footprint, making them strong functional replacement candidates. However, the AM1808EZWTA3 offers an extended temperature range and additional integrated peripherals such as a SATA controller and LCD controller, while the AM1806BZCED4 is a reduced-feature variant. Engineers should validate peripheral requirements, temperature operating conditions, and pin multiplexing before finalizing a substitution.
Core Architecture and Clock Speed
High match
Package and Pin Count
High match
Operating Temperature Range
Validation required
Integrated Peripheral Set
Validation required
Parts at a glance
Part B
AM1806BZCED4
德州儀器
- Lifecycle
- Active
- Stock
- 9430 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 | AM1806BZCED4 | 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 | 456 MHz | Identical clock speed means comparable processing throughput for timing-sensitive applications. |
| Package / Case | 361-LFBGA (16x16) | 361-LFBGA (16x16) | Same package and footprint allow drop-in PCB replacement without layout changes. |
| Operating Temperature Range | -40°C to 105°C | -40°C to 90°C | The wider temperature range of the AM1808EZWTA3 supports harsher industrial environments. |
| On-Chip RAM | 8KB ARM RAM + 128KB shared RAM | 8KB ARM RAM + 128KB shared RAM | Matching internal memory resources ensure equivalent buffering and code execution behavior. |
| Ethernet MAC | 10/100 Mbps EMAC with MDIO | 10/100 Mbps EMAC with MDIO | Both integrate the same Ethernet MAC, preserving networking capability without external controllers. |
| USB Ports | 2 (1x USB 2.0 OTG + 1x USB 1.1 OHCI) | 2 (1x USB 2.0 OTG + 1x USB 1.1 OHCI) | Identical USB configuration maintains peripheral connectivity options for host and device modes. |
| LCD Controller | Integrated LCD controller | Integrated LCD controller | Both include an LCD controller, so display-driving functionality is retained across the parts. |
| UART / SPI / I2C Interfaces | 3x UART, 2x SPI, 2x I2C | 3x UART, 2x SPI, 2x I2C | Matching serial interface counts ensure the same number of external peripherals can be connected. |
| Supply Voltage (Core) | 1.2 V (core), 1.8/3.3 V (I/O) | 1.2 V (core), 1.8/3.3 V (I/O) | Same voltage rails allow reuse of the existing power supply design without modification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM1808EZWTA3 | AM1806BZCED4 |
|---|---|---|
| Supplier | - | 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 | 456MHz |
| 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) | -40°C ~ 90°C (TJ) |
| Ethernet | 10/100Mbps (1) | - |
| SATA | SATA 3Gbps (1) | - |
Frequently asked questions
What are the key differences between the AM1808EZWTA3 and AM1806BZCED4?
The AM1808EZWTA3 is an ARM926EJ-S based Sitara processor running at 375 MHz in a 361-ball NFBGA (ZWT) package, while the AM1806BZCED4 is an ARM926EJ-S based Sitara processor running at 456 MHz in a 361-ball NFBGA (ZCE) package. Both are members of the AM180x family but differ in maximum operating frequency, package ballout, and associated peripheral configurations documented in their respective datasheets.
Are the AM1808EZWTA3 and AM1806BZCED4 pin-to-pin compatible?
No. The AM1808EZWTA3 uses the ZWT package and the AM1806BZCED4 uses the ZCE package. Although both are 361-ball NFBGA devices, the ball assignments and package outlines differ per the respective Texas Instruments datasheets, so they are not drop-in replacements and require separate PCB land patterns.
What is the maximum operating frequency of each device?
The AM1808EZWTA3 is specified for 375 MHz operation, and the AM1806BZCED4 is specified for 456 MHz operation, per the Texas Instruments AM1808 and AM1806 datasheets. The higher frequency of the AM1806BZCED4 affects timing closure and power dissipation in the target design.
Do both devices include an LCD controller?
No. The AM1808 includes an integrated LCD controller, whereas the AM1806 does not include an LCD controller. This is a primary functional differentiator between the two parts and must be considered when evaluating substitution.
What memory interfaces do these processors support?
Both devices provide a 16/32-bit DDR2/mDDR SDRAM interface, an asynchronous EMIFA interface for NAND/NOR flash, and a Serial ATA (SATA) interface, as documented in the Texas Instruments AM180x datasheets. Designers should confirm exact supported memory types and timing parameters against the specific device datasheet.
Can the AM1806BZCED4 be used as a substitute for the AM1808EZWTA3?
Not directly. Because the AM1806 lacks the LCD controller present on the AM1808 and uses a different package (ZCE vs ZWT) with a different maximum frequency, substitution requires a full design review of peripherals, PCB layout, and timing. Substitution is only valid after validating all differences against the official Texas Instruments datasheets.
What are the operating temperature ranges for these devices?
The AM1808EZWTA3 is specified for the industrial temperature range of -40°C to 105°C (TA suffix), and the AM1806BZCED4 is specified for the extended temperature range of -40°C to 90°C (ED suffix), per the Texas Instruments ordering information. The temperature suffix must be matched to the application's thermal requirements.