Part A
AM1808EZWTD4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 4891 個数
- Package
- NFBGA-361
- Series
- 組み込み - マイクロプロセッサ
Replacement verdict
Not a drop-in replacement
The AM1808EZWTD4 and AM1802BZCED3 are both Sitara ARM9-based applications processors from Texas Instruments, but they differ in core clock speed, on-chip memory, integrated peripherals, and package/pinout, so the AM1802BZCED3 cannot be used as a direct drop-in substitute for the AM1808EZWTD4 without design validation.
Different core clock speed
Different on-chip memory
Different peripheral set
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 | AM1808EZWTD4 | AM1802BZCED3 | Why it matters |
|---|---|---|---|
| Core Architecture | ARM926EJ-S (ARM9) single core | ARM926EJ-S (ARM9) single core | Both share the same ARM9 core, so instruction set and toolchain compatibility are preserved, easing software porting. |
| Maximum Clock Frequency | 456 MHz | 300 MHz | A higher clock speed yields more processing throughput; a drop from 456 MHz to 300 MHz reduces compute headroom for timing-critical tasks. |
| On-Chip RAM (SRAM) | 128 KB | 8 KB | On-chip SRAM is used for fast scratchpad and stack; a large reduction affects buffer-heavy or interrupt-latency-sensitive firmware. |
| Package / Pin Count | 361-ball NFBGA (ZWT) | 361-ball NFBGA (ZCE) | Package and ballout determine PCB footprint and routing; differing ball maps require layout changes for a drop-in swap. |
| Operating Temperature Range | -40°C to +90°C (extended/industrial) | -40°C to +90°C (extended/industrial) | Temperature rating governs suitability for harsh environments; matching ranges means equivalent thermal qualification. |
| Ethernet MAC | 10/100 Mbps EMAC with MDIO | 10/100 Mbps EMAC with MDIO | Integrated Ethernet MAC enables networked designs without external controllers; identical capability preserves connectivity features. |
| USB Support | USB 2.0 High-Speed OTG with integrated PHY | USB 2.0 High-Speed OTG with integrated PHY | An integrated HS USB PHY saves board space and BOM cost; matching support keeps peripheral interfaces unchanged. |
| LCD Controller | Integrated LCD controller (up to 16-bit) with raster support | Integrated LCD controller (up to 16-bit) with raster support | An on-chip LCD controller enables direct display drive; equivalent support preserves HMI/display functionality. |
| External Memory Interface | mDDR/DDR2 SDRAM, NAND/NOR flash, async SRAM | mDDR/DDR2 SDRAM, NAND/NOR flash, async SRAM | Memory interface breadth determines supported external memory types; matching options keep the memory subsystem design valid. |
| Serial Interfaces | Multiple UART, SPI, I2C, McASP, McBSP, eCAP, eHRPWM | Multiple UART, SPI, I2C, McASP, McBSP, eCAP, eHRPWM | Peripheral set defines system connectivity; identical serial interfaces allow reuse of existing drivers and board nets. |
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 | AM1808EZWTD4 | AM1802BZCED3 |
|---|---|---|
| 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 | 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 AM1808EZWTD4 and AM1802BZCED3?
The AM1808EZWTD4 is an ARM926EJ-S based Sitara processor running at 456 MHz in a 361-ball NFBGA (ZWT) package, while the AM1802BZCED3 is a lower-tier Sitara device running at 300 MHz in a 361-ball NFBGA (ZCE) package. The AM1808 offers a richer peripheral set including an LCD controller, uPP, and additional connectivity, whereas the AM1802 is a reduced-feature variant of the same AM180x family.
Are the AM1808EZWTD4 and AM1802BZCED3 pin-to-pin compatible?
Both devices use a 361-ball NFBGA package, but the ball maps are not identical because the AM1808 exposes peripherals (such as the LCD controller and uPP) that the AM1802 does not. A direct drop-in replacement is therefore not supported without verifying the ball assignment and peripheral availability against the respective Texas Instruments datasheets.
What is the operating frequency of each device?
The AM1808EZWTD4 is specified for 456 MHz operation, while the AM1802BZCED3 is specified for 300 MHz operation. The frequency suffix in each orderable part number reflects the rated device speed grade.
Do both parts share the same ARM core architecture?
Yes. Both the AM1808EZWTD4 and AM1802BZCED3 are based on the ARM926EJ-S RISC core with ARMv5TEJ instruction set support, integrated memory management, and 16 KB/8 KB instruction and data caches, consistent with the Texas Instruments AM180x Sitara processor family.
What temperature range do these devices support?
Both the AM1808EZWTD4 and AM1802BZCED3 are rated for the industrial temperature range of -40°C to 90°C (case temperature), as indicated by the "T" and "D" temperature designators in their orderable part numbers.
Which peripherals distinguish the AM1808EZWTD4 from the AM1802BZCED3?
The AM1808EZWTD4 integrates an LCD controller, a universal parallel port (uPP), and a fuller set of serial and connectivity peripherals. The AM1802BZCED3 omits the LCD controller and uPP, providing a reduced peripheral set intended for cost-sensitive applications that do not require display or high-speed parallel interfaces.
Can the AM1802BZCED3 be used as a substitute for the AM1808EZWTD4 in an existing design?
Substitution is only possible if the design does not rely on peripherals present on the AM1808 but absent on the AM1802 (such as the LCD controller and uPP) and if the reduced 300 MHz speed grade meets timing requirements. The ball map and peripheral differences must be validated against both Texas Instruments datasheets before any substitution.