Part A
AM1808BZWTD4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 1425 個数
- Package
- LFBGA-361
- Series
- 組み込み - マイクロプロセッサ
Replacement verdict
Not a drop-in replacement
The AM1808BZWTD4 and AM1802BZCED3 are both ARM926EJ-S based Sitara processors from Texas Instruments, but they differ in core clock speed, on-chip memory configuration, operating temperature range, and package/pinout, so the AM1802BZCED3 cannot serve as a direct drop-in substitute for the AM1808BZWTD4 without design validation.
Different core clock speed
Different on-chip memory
Different temperature range
Different package and pinout
Parts at a glance
Part B
AM1802BZCED3
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6907 個数
- Package
- LFBGA-361
- Series
- 組み込み - マイクロプロセッサ
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 | AM1802BZCED3 | 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 | 300 MHz | A higher clock speed provides more processing throughput; a slower part may not meet timing requirements of the original design. |
| Package / Case | 361-LFBGA (16x16) | 361-NFBGA (13x13) | Different package footprints and ball maps affect PCB layout and may prevent a direct drop-in replacement. |
| Operating Temperature Range | -40°C to 90°C (TJ) | -40°C to 90°C (TJ) | Matching temperature ranges ensure the substitute can operate in the same environmental conditions. |
| On-Chip RAM | 128KB | 128KB | Identical internal SRAM supports the same firmware memory map and buffering needs. |
| Ethernet | 10/100 Mbps MAC | 10/100 Mbps MAC | Both integrate an Ethernet MAC, so networking capability is retained in the substitute. |
| USB | USB 2.0 OTG + Host | USB 2.0 OTG + Host | Equivalent USB support preserves peripheral connectivity options. |
| LCD Controller | Yes | No | The AM1808 includes an LCD controller while the AM1802 does not, so display functionality would be lost with the substitute. |
| UART / SPI / I2C Count | 3 UART, 2 SPI, 2 I2C | 3 UART, 2 SPI, 2 I2C | Matching serial interface counts ensures existing peripheral connections remain supported. |
| Supply Voltage (Core) | 1.2 V | 1.2 V | Same core voltage allows reuse of the existing 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 | AM1808BZWTD4 | AM1802BZCED3 |
|---|---|---|
| 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 | 300MHz |
| Co - Processors / DSP | System Control; CP15 | System Control; CP15 |
| RAM Controllers | LPDDR, DDR2 | LPDDR, DDR2 |
| Graphics Acceleration | No | No |
| Display&Interface Controllers | LCD | LCD |
| Ethernet | 10/100Mbps (1) | 10/100Mbps (1) |
| 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 ~ 90°C (TJ) |
| SATA | SATA 3Gbps (1) | - |
Frequently asked questions
What are the key differences between the AM1808BZWTD4 and AM1802BZCED3?
The AM1808BZWTD4 is a Sitara ARM926EJ-S applications processor running at 456 MHz in a 361-ball NFBGA (ZWT) package, while the AM1802BZCED3 is a lower-tier variant running at 300 MHz in a 361-ball NFBGA (ZCED) package. The AM1808 integrates a wider set of peripherals including an LCD controller and additional connectivity, whereas the AM1802 omits certain display and interface features to reduce cost and power.
Are the AM1808BZWTD4 and AM1802BZCED3 pin-to-pin compatible?
Both devices are offered in a 361-ball NFBGA package, but pin-to-pin compatibility cannot be assumed. The AM1808 and AM1802 differ in peripheral set and pin multiplexing, so designers must verify the pinout and signal assignments against the respective Texas Instruments datasheets before considering a layout-compatible substitution.
What is the maximum operating frequency of each device?
The AM1808BZWTD4 is specified at 456 MHz, while the AM1802BZCED3 is specified at 300 MHz. The higher clock rate of the AM1808 supports greater processing throughput for compute-intensive embedded applications.
Do both parts share the same ARM core architecture?
Yes. Both the AM1808BZWTD4 and AM1802BZCED3 are based on the ARM926EJ-S RISC core, which includes an MMU, 16 KB instruction cache, 8 KB data cache, and a DSP instruction extension. This shared architecture allows similar software and toolchain support across both devices.
Which device offers integrated LCD support?
The AM1808BZWTD4 integrates an LCD controller for direct display interfacing, while the AM1802BZCED3 does not include an LCD controller. Designs requiring a graphical display interface should select the AM1808 or add an external display controller.
Can the AM1802BZCED3 be used as a drop-in replacement for the AM1808BZWTD4?
No. Although both are ARM926EJ-S devices in 361-ball NFBGA packages, the AM1802BZCED3 lacks certain peripherals (such as the LCD controller) present on the AM1808BZWTD4 and operates at a lower maximum frequency. A drop-in replacement requires full validation of pinout, peripheral availability, and timing against the target design.
What memory interfaces do these processors support?
Both the AM1808BZWTD4 and AM1802BZCED3 include a 16/32-bit DDR2/mDDR SDRAM controller, an asynchronous EMIFA interface for NOR/NAND flash and SRAM, and a serial ATA (SATA) interface. These shared memory interfaces support similar external memory configurations across both parts.
Which device is better suited for low-power portable designs?
The AM1802BZCED3, with its lower 300 MHz operating frequency and reduced peripheral set, is generally better suited to cost- and power-sensitive portable designs. The AM1808BZWTD4 at 456 MHz with additional peripherals targets applications requiring higher performance and display capability.