Part A
AM1808BZWTD4
德州儀器
- Lifecycle
- Active
- Stock
- 1425 件
- Package
- LFBGA-361
- Series
- 嵌入式微處理器
Replacement verdict
Compatible functional replacement candidate
The AM1806BZWT4 is a viable functional replacement candidate for the AM1808BZWTD4 in designs that do not require the AM1808's additional on-chip peripherals and extended feature set. Both devices share the same ARM926EJ-S core, BGA package footprint, and industrial temperature range, but the AM1806 omits features such as the LCD controller and additional connectivity options present on the AM1808. Engineers should validate peripheral requirements and pin multiplexing before substituting.
Core Architecture
High match
Package Type
High match
On-Chip Peripherals
Validation required
Operating Temperature
High match
Parts at a glance
Part B
AM1806BZWT4
德州儀器
- Lifecycle
- Active
- Stock
- 7006 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 | AM1808BZWTD4 | AM1806BZWT4 | Why it matters |
|---|---|---|---|
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both use the same ARM926EJ-S core, so instruction set and software compatibility are identical. |
| Number of Cores / Bus Width | 1 Core, 32-Bit | 1 Core, 32-Bit | Single 32-bit core in both devices means equivalent processing architecture for firmware portability. |
| Speed | 456MHz | 456MHz | Identical clock speed ensures the same timing budget and performance headroom for real-time tasks. |
| On-Chip RAM | 128KB | 128KB | Matching internal SRAM supports the same scratchpad and buffer usage without memory-map changes. |
| External Memory Interface | SDRAM, DDR2, mDDR | SDRAM, DDR2, mDDR | Same supported memory types allow reuse of the same external memory design and layout. |
| Package / Case | 361-LFBGA | 361-LFBGA | Identical BGA package and pinout enable drop-in board replacement without PCB redesign. |
| Operating Temperature | -40°C to 90°C (TJ) | -40°C to 90°C (TJ) | Same junction temperature range means equivalent thermal qualification for industrial environments. |
| Supply Voltage | 1.2V Core, 1.8V/3.3V I/O | 1.2V Core, 1.8V/3.3V I/O | Matching voltage rails allow the same power supply design to be used for either part. |
| Integrated Peripherals | LCD Controller, USB 2.0 OTG, EMAC, uPP, SATA | LCD Controller, USB 2.0 OTG, EMAC, uPP | The AM1808 adds a SATA interface not present on the AM1806, which affects storage-capable designs. |
| Ethernet | 10/100 EMAC (MII/RMII) | 10/100 EMAC (MII/RMII) | Same Ethernet MAC supports identical networking firmware and PHY interfacing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM1808BZWTD4 | AM1806BZWT4 |
|---|---|---|
| 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 | 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 ~ 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 AM1806BZWT4?
The AM1808BZWTD4 is a Sitara ARM microprocessor based on the ARM926EJ-S core running at 456 MHz, featuring 128 KB of on-chip RAM, an LCD controller, and a 16-bit DDR2/mDDR memory interface. The AM1806BZWT4 is a lower-tier variant in the same AM180x family, running at 456 MHz with 128 KB of on-chip RAM but omitting the LCD controller and offering a reduced peripheral set. Both are packaged in a 361-ball PBGA (ZWT) and share the same ARM926EJ-S core architecture.
Are the AM1808BZWTD4 and AM1806BZWT4 pin-to-pin compatible?
Both devices are offered in the same 361-ball ZWT PBGA package, but pin-to-pin compatibility cannot be assumed solely from package identity. The AM1808BZWTD4 exposes additional functions such as LCD controller signals that the AM1806BZWT4 does not support. Designers must verify the pin multiplexing and signal assignments against the respective Texas Instruments datasheets before considering a layout-level substitution.
Do both devices share the same ARM core and clock speed?
Yes. Both the AM1808BZWTD4 and AM1806BZWT4 are built on the ARM926EJ-S RISC core and are rated for a maximum operating frequency of 456 MHz, as specified in the Texas Instruments AM1808 and AM1806 datasheets. Core-level firmware and instruction-set compatibility is therefore maintained across the two parts.
What memory and peripheral differences affect selection between these two parts?
The AM1808BZWTD4 integrates an LCD controller and a more complete peripheral set, making it suitable for applications requiring display output. The AM1806BZWT4 omits the LCD controller and provides a reduced peripheral configuration. Both include 128 KB of on-chip RAM and support external DDR2/mDDR memory. Selection should be based on whether display interfacing and the additional peripherals are required by the target design.
Can the AM1806BZWT4 be used as a drop-in replacement for the AM1808BZWTD4?
Not as a direct drop-in replacement. Although both share the 361-ball ZWT package and ARM926EJ-S core, the AM1806BZWT4 lacks the LCD controller and certain peripherals present on the AM1808BZWTD4. Any substitution requires validation of pin multiplexing, peripheral availability, and software configuration against the Texas Instruments datasheets for both devices.
What package and temperature grade do these devices use?
Both the AM1808BZWTD4 and AM1806BZWT4 are supplied in the 361-ball PBGA (ZWT) package. The "D4" suffix in AM1808BZWTD4 and the corresponding suffix in AM1806BZWT4 denote the industrial temperature grade per Texas Instruments ordering conventions. Designers should confirm the exact operating temperature range from the respective datasheet ordering information tables.
Are both devices supported by the same software and development tools?
Yes. Both the AM1808BZWTD4 and AM1806BZWT4 belong to the Texas Instruments AM180x Sitara ARM microprocessor family and are supported by the same software ecosystem, including TI's StarterWare, Linux and RTOS support, and Code Composer Studio. Software developed for the AM1808BZWTD4 can generally be adapted to the AM1806BZWT4, provided that features dependent on the omitted LCD controller and reduced peripherals are removed or reworked.