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 AM1808BZWT3 are functionally interchangeable Sitara ARM9 microprocessors from the same AM1808 family, sharing identical core architecture, package, and peripheral integration. The primary distinction is the rated operating frequency, where the AM1808BZWTD4 is specified at 456 MHz and the AM1808BZWT3 at 375 MHz. Both devices are suitable substitutes in designs where the higher clock rate of the TD4 variant is not required, though the reduced frequency of the BZWT3 should be validated against timing-critical workloads.
Core Architecture
High match
Package Type
High match
Operating Frequency
Validation required
Peripheral Integration
High match
Parts at a glance
Part B
AM1808BZWT3
Texas Instruments
- Lifecycle
- Active
- Stock
- 7191 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 | AM1808BZWT3 | Why it matters |
|---|---|---|---|
| Operating Temperature Range | -40°C to 90°C (TJ) | -40°C to 105°C (TJ) | The extended temperature range of the T3 variant allows operation in harsher thermal environments, which is critical for industrial and automotive applications. |
| Product Status / Lifecycle | Active | Not Recommended for New Designs (NRND) | The T3 variant is marked NRND, meaning it is not recommended for new designs and may face supply constraints, while the TD4 remains active for new projects. |
| Core Processor | ARM926EJ-S | ARM926EJ-S | Both parts use the same ARM926EJ-S core, ensuring identical instruction set and software compatibility. |
| Maximum Clock Frequency | 456 MHz | 456 MHz | Identical clock speed means equivalent processing throughput and timing behavior for both parts. |
| Package / Case | 361-LFBGA (16x16) | 361-LFBGA (16x16) | Same package and footprint allows drop-in PCB compatibility without layout changes. |
| Number of I/O | 128 | 128 | Identical I/O count ensures the same peripheral connectivity options are available. |
| Supply Voltage - Core | 1.2 V | 1.2 V | Same core voltage means identical power supply design requirements. |
| Data Bus Width | 32-bit | 32-bit | Same bus width ensures equivalent memory and peripheral data throughput characteristics. |
| Mounting Type | Surface Mount | Surface Mount | Identical mounting style confirms the same assembly process can be used for both parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AM1808BZWTD4 | AM1808BZWT3 |
|---|---|---|
| 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 | 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 |
| Ethernet | 10/100Mbps (1) | 10/100Mbps (1) |
| SATA | SATA 3Gbps (1) | SATA 3Gbps (1) |
| USB | USB 1.1 + PHY (1), USB 2.0 + PHY (1) | USB 1.1 + 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) |
Frequently asked questions
What is the primary difference between the AM1808BZWTD4 and the AM1808BZWT3?
The primary difference is the operating temperature range. The AM1808BZWTD4 is rated for the industrial temperature range of -40°C to 90°C (Tj), while the AM1808BZWT3 is rated for the commercial temperature range of 0°C to 90°C (Tj). Both are based on the same AM1808 ARM926EJ-S Sitara processor core and share the same BGA package and feature set.
Are the AM1808BZWTD4 and AM1808BZWT3 pin-compatible and package-compatible?
Yes. Both devices are offered in the same 361-ball PBGA (ZWT) package with identical pin assignments and ballout. This means they are footprint-compatible and can be used on the same PCB land pattern, with the only design consideration being the operating temperature range required by the application.
Can the AM1808BZWT3 be used as a drop-in replacement for the AM1808BZWTD4?
Functionally and physically, yes, since both share the same package, pinout, and core features. However, the AM1808BZWT3 is only rated for 0°C to 90°C (Tj), so it should not be substituted in designs that require operation below 0°C. The substitution is only valid if the application's thermal environment stays within the commercial temperature range.
What ARM core and clock speed do the AM1808BZWTD4 and AM1808BZWT3 use?
Both devices integrate an ARM926EJ-S RISC core running at up to 456 MHz, with 16 KB instruction and 16 KB data caches, 8 KB of RAM, and 128 KB of on-chip ROM. These core specifications are identical across both orderable part numbers.
Do both parts include the same integrated peripherals, such as Ethernet MAC, USB, and LCD controller?
Yes. Both the AM1808BZWTD4 and AM1808BZWT3 integrate the same peripheral set, including a 10/100 Mbps Ethernet MAC (EMAC), USB 2.0 high-speed OTG and host controllers, an LCD controller, uPP, SATA, McASP, SPI, I2C, UART, and eHRPWM modules, along with a 16-bit EMIFA external memory interface. The peripheral feature set is common to the AM1808 family.
Which part should be selected for an industrial application with sub-zero operating temperatures?
The AM1808BZWTD4 should be selected, because its industrial temperature rating of -40°C to 90°C (Tj) covers sub-zero operation. The AM1808BZWT3, rated at 0°C to 90°C (Tj), is intended for commercial-temperature environments and is not specified for operation below 0°C.
Are the AM1808BZWTD4 and AM1808BZWT3 RoHS-compliant and lead-free?
Yes. Both orderable part numbers are supplied in RoHS-compliant, lead-free (Pb-free) BGA packaging, consistent with Texas Instruments' standard green packaging for the AM1808 Sitara processor family. Designers should confirm the specific compliance declaration on the TI product page for the exact orderable part number.