Part A
AM1808BZWTD4
Texas Instruments
- Lifecycle
- Active
- Stock
- 1425 PCS
- Package
- LFBGA-361
- Series
- Microprocesseur intégré
Replacement verdict
Compatible functional replacement candidate
The AM1808BZWTD4 and AM1806BZCED4 are both Sitara ARM926EJ-S application processors from Texas Instruments sharing the same AM18x family architecture, 375 MHz core clock, and 361-ball NFBGA package, making them strong functional replacement candidates. However, the AM1808BZWTD4 offers a wider industrial 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 set requirements, operating temperature margin, and pin multiplexing before finalizing a substitution in production designs.
Core Architecture and Clock Speed
High match
Package and Pin Count
High match
Operating Temperature Range
Validation required
Integrated Peripheral Set
Not compatible
Parts at a glance
Part B
AM1806BZCED4
Texas Instruments
- Lifecycle
- Active
- Stock
- 9430 PCS
- Package
- LFBGA-361
- Series
- Microprocesseur intégré
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 | AM1806BZCED4 | Why it matters |
|---|---|---|---|
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both use the same ARM926EJ-S core, so instruction set and software compatibility are identical. |
| Package / Case | 361-LFBGA (16x16) | 361-NFBGA (13x13) | Different package footprints and ball maps prevent direct board-level drop-in replacement without a PCB redesign. |
| Operating Temperature Range | -40°C to 90°C (TJ) | -40°C to 90°C (TJ) | Identical thermal ratings mean both suit the same industrial temperature environments. |
| On-Chip RAM | 8KB ARM RAM + 128KB shared RAM | 8KB ARM RAM + 128KB shared RAM | Matching internal memory resources support the same firmware memory maps and boot strategies. |
| Display Subsystem (LCD Controller) | Integrated LCD controller | Not available | The AM1808 includes an LCD controller while the AM1806 does not, so display-capable designs cannot substitute the AM1806. |
| USB Ports | 2 (USB 2.0 OTG + Host) | 1 (USB 2.0 OTG) | The AM1808 offers an additional USB host port, affecting connectivity options and peripheral support. |
| EMAC (Ethernet MAC) | 10/100 Mbps EMAC with MDIO | 10/100 Mbps EMAC with MDIO | Both integrate the same Ethernet MAC, enabling equivalent networked application designs. |
| uPP (Universal Parallel Port) | 1 uPP interface | 1 uPP interface | Identical high-speed parallel interface availability supports the same external ADC/DAC or FPGA connections. |
| McASP (Multichannel Audio Serial Port) | 3 McASP | 3 McASP | Same audio serial port count preserves multichannel audio and DSP interconnect capabilities. |
| Maximum CPU Frequency | 456 MHz | 456 MHz | Equal clock speed means identical processing throughput for timing-sensitive applications. |
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 | AM1806BZCED4 |
|---|---|---|
| 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 | 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) | -40°C ~ 90°C (TJ) |
| Ethernet | 10/100Mbps (1) | - |
| SATA | SATA 3Gbps (1) | - |
Frequently asked questions
What are the key differences between the AM1808BZWTD4 and AM1806BZCED4?
The AM1808BZWTD4 is a Sitara ARM microprocessor based on the ARM926EJ-S core running at 456 MHz, supplied in a 361-ball PBGA (ZWT) package, and specified for the commercial temperature range of 0°C to 90°C. The AM1806BZCED4 is based on the same ARM926EJ-S core but runs at 456 MHz and is supplied in a 361-ball NFBGA (ZCE) package, specified for the extended temperature range of -40°C to 90°C. The primary differences are package type (PBGA vs NFBGA) and operating temperature range (commercial vs extended).
Are the AM1808BZWTD4 and AM1806BZCED4 pin-to-pin compatible?
No. The AM1808BZWTD4 uses the ZWT 361-ball PBGA package, while the AM1806BZCED4 uses the ZCE 361-ball NFBGA package. Although both are 361-ball packages, the ball pitch, land pattern, and mechanical dimensions differ between the ZWT and ZCE package types, so they are not drop-in replacements on the same PCB footprint without layout changes.
Do both devices operate at the same core frequency?
Yes. Both the AM1808BZWTD4 and AM1806BZCED4 are specified with an ARM926EJ-S core maximum operating frequency of 456 MHz, per the Texas Instruments AM1808 and AM1806 datasheets.
What is the operating temperature range of each device?
The AM1808BZWTD4 (ZWT package) is rated for the commercial temperature range of 0°C to 90°C. The AM1806BZCED4 (ZCE package) is rated for the extended temperature range of -40°C to 90°C. Designs requiring sub-zero operation should use the extended-temperature variant.
Are the AM1808 and AM1806 functionally identical apart from package and temperature?
No. The AM1808 integrates additional peripherals not present on the AM1806, most notably a uPP (universal parallel port) and an LCD controller, along with a different set of serial and connectivity interfaces. The AM1806 is a reduced-feature variant of the AM180x family. Designers must compare the peripheral sets in the respective datasheets before considering either part as a substitute.
Can the AM1806BZCED4 be used as a substitute for the AM1808BZWTD4?
Not directly. Substitution requires validating package footprint differences (ZWT PBGA vs ZCE NFBGA), confirming that the reduced peripheral set of the AM1806 meets the design's requirements (for example, absence of the uPP and LCD controller), and verifying that the extended temperature rating is acceptable for the application. A schematic and layout review against both datasheets is required before substitution.
What memory and interface support do these devices provide?
Both devices integrate a 16/32-bit DDR2/mDDR SDRAM controller, asynchronous EMIF (NOR/NAND flash), and a rich set of serial interfaces including UART, SPI, I2C, and USB 2.0 OTG, as documented in the Texas Instruments AM1808 and AM1806 datasheets. The AM1808 additionally provides the uPP and LCD controller interfaces not available on the AM1806.
Which device should be selected for an extended-temperature industrial design?
The AM1806BZCED4, because it is specified over the -40°C to 90°C extended temperature range, whereas the AM1808BZWTD4 is limited to the 0°C to 90°C commercial range. The designer must also confirm that the AM1806 peripheral set satisfies the application, since it lacks the uPP and LCD controller found on the AM1808.