Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1336-BDB-SP45D |
| Product Type | Gate Driver PCB |
| OEM Assembly Number | 74101-169-84 |
| Drive Family | 1336STEF |
| Voltage Class | 460 VAC |
| Power Rating | 400 HP |
| Frame | G-Frame |
| Primary Function | Gate-drive signal control for power-switching devices |
| Quantity per Drive | 1 kit |
| Earlier Revisions | 1336-BDB-SP45A / SP45C |
| Current Replacement Revision | SP45D |
| Lifecycle | Legacy / discontinued |
Rockwell’s official spare-parts list identifies 1336-BDB-SP45D as “PCB, Gate Driver, 1336STEF, 460V, 400 HP, G-frame” and specifies one kit per drive. The same document states that SP45A and SP45C were obsolete and replaced by SP45D.
The 74101-169-84 assembly number is also associated with SP45D in technical parts documentation.
Application Scenarios & Pain Points
A 400 HP drive is usually connected to equipment where downtime is measured in production losses, not just maintenance hours. Large pumps, fans, compressors, conveyors, and process machinery can remain unavailable while a single obsolete PCB is being sourced.
Typical Applications
- 1336STEF Motor Drives: The documented configuration is 460 VAC, 400 HP, G-Frame.
- High-Power Legacy Drive Repair: The board is suited to maintaining installed 1336 systems where replacing the complete drive would require cabinet, motor, or control-system modifications.
- Gate-Drive Fault Investigation: When the main control electronics appear operational but the inverter power devices are not being driven correctly, SP45D becomes a relevant board-level suspect.
- Maintenance Spare Stock: Facilities with multiple compatible 1336STEF G-Frame drives may benefit from holding a verified spare rather than sourcing an obsolete board after a failure.
Field Case:
A large drive may power its keypad and control electronics while refusing to produce motor output. Before replacing SP45D, inspect the DC bus, gate-drive supply, power semiconductors, and board connectors. A failed IGBT or downstream gate circuit can damage a replacement board immediately—an unpleasant discovery after the cabinet has already been closed.
1336-BDB-SP45D
Related Products
- 1336-BDB-SP45A — Earlier SP45 gate-driver revision for the same general 1336STEF 460 V / 400 HP G-Frame application. Rockwell lists it as obsolete and replaced by .
- 1336-BDB-SP45C — Earlier revision of the SP45 assembly. Useful for identifying the original board installed in an older drive; is the documented replacement.
- 1336-BDB-SP44D — Gate-driver PCB for 1336STEF, 460 VAC, 350 HP, G-Frame. Same general function but one power class below ; not a direct substitute.
- 1336-BDB-SP53D — Gate-driver PCB for 1336STEF, 460 VAC, 450 HP, G-Frame. One power class above and intended for a different drive configuration.
- 1336-BDB-SP43D — Gate-driver PCB for 1336STEF, 460 VAC, 300 HP, G-Frame. Same family and frame, but substantially different power application.
- 1336-BDB-SP46D — Gate-driver PCB for 1336STEF, 460 VAC, 600 HP, G-Frame. It shares the G-Frame family but is intended for a significantly larger power stage.
- 1336-BDB-SP74D — Gate-driver PCB for 1336STEF, 460 VAC, 350 HP, F-Frame. Important comparison part because the horsepower range overlaps nearby G-Frame units, but the frame is different.
- 1336-BDB-SP75D — Gate-driver PCB for 1336STEF, 460 VAC, 400 HP, F-Frame. The same 400 HP rating does not make it interchangeable with ; frame-specific compatibility must be confirmed.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Do Not Match Only the 400 HP Rating
There is a particularly easy trap here: is 400 HP G-Frame, while SP75D is 400 HP F-Frame. Same voltage and horsepower, different frame/application.
How to avoid it: Match the complete drive catalog number, frame designation, voltage, horsepower, and BDB-SP number before releasing the purchase order.
⚠️ Do Not Assume SP45A/C and Are Unrelated Parts
Rockwell specifically documents SP45A/C as obsolete and replaced by .
How to avoid it: If the installed board is marked SP45A or SP45C, verify the host drive against the documented replacement rather than searching for an exact obsolete revision unnecessarily.
⚠️ Investigate the Original Power-Stage Failure
The gate-driver board works directly with the switching devices. Installing a replacement into a drive with a shorted power transistor can result in another failed board.
How to avoid it: Lock out the drive, verify the DC bus has discharged, inspect the power devices and gate connections, check fuses and driver supplies, and identify the original failure before energizing the replacement.
Frequently Asked Questions (FAQ)
What is Allen-Bradley 1336-BDB-?
It is a gate-driver PCB for the Allen-Bradley 1336STEF drive family, specifically identified for 460 VAC, 400 HP, G-Frame applications. Rockwell lists one kit required per drive.
What is the OEM part number associated with 1336-BDB-?
The assembly is associated with 74101-169-84 in technical parts documentation.
For purchasing, it is useful to retain both identifiers: 1336-BDB- / 74101-169-84.
Can 1336-BDB-SP45C be replaced by ?
Yes. Rockwell’s spare-parts documentation identifies SP45A/C as obsolete and replaced by .
Still verify the complete host-drive configuration before installation. A revision replacement is not the same thing as universal compatibility.
Can I use 1336-BDB-SP75D because it is also 400 HP?
No—not without engineering confirmation. is identified for a 400 HP G-Frame application, while SP75D is identified for a 400 HP F-Frame application.
Frame-specific power assemblies should be treated as configuration-specific components.
Is 1336-BDB- a complete VFD?
No. It is a gate-driver PCB inside the 1336 drive. It does not include the complete drive, main control board, power module assembly, enclosure, or motor interface.
What should I verify when buying a refurbished ?
Request actual photographs and verify:
- marking
- 74101-169-84 assembly identification
- PCB revision
- Connector condition
- Evidence of thermal damage or oxidation
- Gate-drive functional testing
- Host-drive configuration used for testing
- Test report
- Warranty terms
For a 400 HP board, a simple continuity check is not a meaningful functional acceptance test. Ask what circuitry was actually energized and measured.
Is still manufactured?
Rockwell’s parts documentation identifies as the replacement for the obsolete /C revisions, while current technical listings classify as discontinued/obsolete.
For procurement, treat it as a legacy spare and verify the actual board revision, condition, and test evidence rather than relying solely on a stock-status statement.
