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 AM1806BZWT3 is a viable functional replacement candidate for the AM1808BZWTD4 in applications where the reduced on-chip memory and lower maximum clock rate are acceptable, since both devices share the same ARM926EJ-S core, BGA package footprint, and Sitara AM1x platform architecture. Engineers should validate memory-intensive workloads and timing margins before committing to a drop-in substitution.
CPU Core Architecture
High match
On-Chip Memory
Validation required
Maximum Clock Frequency
Validation required
Package Type
High match
Parts at a glance
Part B
AM1806BZWT3
德州儀器
- Lifecycle
- Active
- Stock
- 6789 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 | AM1806BZWT3 | Why it matters |
|---|---|---|---|
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both use the same ARM926EJ-S core, so instruction set and software compatibility are preserved. |
| Maximum Clock Frequency | 456 MHz | 375 MHz | The AM1808 runs faster, which affects throughput and timing margins in performance-sensitive designs. |
| On-Chip RAM | 128 KB | 128 KB | Identical internal SRAM capacity means similar buffer and stack behavior without external memory changes. |
| Package / Case | 361-LFBGA (16x16) | 361-LFBGA (16x16) | Same package and footprint allow drop-in board replacement without PCB redesign. |
| Operating Temperature Range | -40°C to 90°C (TJ) | -40°C to 90°C (TJ) | Matching temperature grades ensure equivalent reliability across industrial environments. |
| Supply Voltage | 1.2 V core / 1.8 V, 3.3 V I/O | 1.2 V core / 1.8 V, 3.3 V I/O | Same voltage rails mean the existing power supply design can be reused unchanged. |
| Ethernet MAC | 10/100 Mbps EMAC with MDIO | 10/100 Mbps EMAC with MDIO | Both integrate an Ethernet MAC, so networked applications remain functionally equivalent. |
| USB Ports | 2 (USB 2.0 OTG + Host) | 2 (USB 2.0 OTG + Host) | Identical USB capability preserves peripheral connectivity options for the design. |
| LCD Controller | Integrated LCD controller | Not integrated | The AM1808 includes an LCD controller while the AM1806 does not, so display-based designs cannot substitute directly. |
| UART / SPI / I2C Interfaces | 3 UART, 2 SPI, 2 I2C | 3 UART, 2 SPI, 2 I2C | Matching serial interface counts ensure existing peripheral connections remain compatible. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM1808BZWTD4 | AM1806BZWT3 |
|---|---|---|
| Supplier | - | 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 AM1806BZWT3?
The AM1808BZWTD4 is a Sitara ARM microprocessor based on the ARM926EJ-S core running at 456 MHz, while the AM1806BZWT3 is a similar Sitara ARM microprocessor running at 375 MHz. Both are in a 361-ball NFBGA (ZWT) package. The AM1808BZWTD4 includes an LCD controller and a SATA controller, whereas the AM1806BZWT3 does not integrate these peripherals. Both devices share the same ARM926EJ-S core architecture and many common peripherals such as USB, EMAC, and McASP.
Are the AM1808BZWTD4 and AM1806BZWT3 pin-to-pin compatible?
Both devices are offered in the same 361-ball ZWT NFBGA package, but they are not fully pin-to-pin compatible because the AM1808BZWTD4 exposes additional interfaces (LCD and SATA) that the AM1806BZWT3 does not support. Pin function assignments differ between the two devices, so a direct drop-in replacement is not possible without verifying the pinout against the respective datasheets.
What is the maximum operating frequency of each device?
The AM1808BZWTD4 operates at a maximum ARM clock frequency of 456 MHz. The AM1806BZWT3 operates at a maximum ARM clock frequency of 375 MHz. Both use the ARM926EJ-S core.
Do both devices support the same operating temperature range?
Both the AM1808BZWTD4 and AM1806BZWT3 are specified for the industrial temperature range of -40°C to 85°C (case temperature), consistent with the "T" temperature designator in their part numbers. Designers should confirm the exact thermal specification in the respective manufacturer datasheets.
What memory and storage interfaces does each device support?
Both devices integrate a DDR2/mDDR memory controller, asynchronous EMIF (NOR/NAND flash), and MMC/SD controller. The AM1808BZWTD4 additionally integrates a SATA controller, which the AM1806BZWT3 does not provide. Both include a universal parallel port (uPP) and an LCD controller is present only on the AM1808BZWTD4.
Can the AM1806BZWT3 be used as a lower-cost substitute for the AM1808BZWTD4?
Substitution is possible only if the target design does not require the LCD controller or SATA controller present on the AM1808BZWTD4, and if the reduced 375 MHz clock rate is acceptable. Because pin functions and peripheral sets differ, the PCB layout and software configuration must be revalidated against the AM1806BZWT3 datasheet before substitution.
What common peripherals do both devices share?
Both the AM1808BZWTD4 and AM1806BZWT3 integrate an ARM926EJ-S core, DDR2/mDDR controller, asynchronous EMIF, MMC/SD, USB 2.0 OTG and host, EMAC (10/100 Mbps Ethernet), McASP, SPI, I2C, UART, PWM, and a universal parallel port (uPP). These shared peripherals allow similar system architectures when the LCD and SATA functions are not required.
What package type do both devices use?
Both the AM1808BZWTD4 and AM1806BZWT3 are supplied in a 361-ball NFBGA (ZWT) package. The package designation "ZWT" appears in both part numbers, confirming the same package family, though pin function assignments differ between the two devices.