Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1336-BDB-SP44D |
| Product Type | Gate Driver PCB |
| Drive Family | 1336STEF |
| Voltage Class | 460 VAC |
| Power Rating | 350 HP |
| Frame | G-Frame |
| Primary Function | Gate-drive control for power-switching devices |
| Quantity per Drive | 1 kit |
| Earlier Versions | 1336-BDB-SP44A / SP44C |
| Replacement Revision | SP44D |
| Application | 1336 PLUS, PLUS II, FORCE, IMPACT and related 460 V drive spare-parts family |
| Lifecycle | Legacy / discontinued |
Rockwell’s parts catalog identifies 1336-BDB-SP44D as “PCB, Gate Driver, 1336STEF, 460V, 350 HP, G-frame” and lists one kit per drive. The same source identifies SP44A/C as obsolete and replaced by SP44D.
The broader spare-parts documentation places SP44D among the high-power 460 V 1336STEF G-Frame gate-driver boards.
Application Scenarios & Pain Points
At 350 HP, the drive is typically tied to equipment where a failed inverter can stop a major production train. A replacement board may be considerably faster to procure and install than redesigning an entire cabinet around a newer drive platform.
Typical Applications
- Large Pumping Systems: Suitable for maintenance of compatible 1336STEF 460 V / 350 HP drive installations where the existing cabinet and motor interface remain serviceable.
- Fans and Process Machinery: A gate-driver failure can leave the control electronics operational while preventing proper switching of the inverter power stage.
- Legacy Drive Repair: Particularly useful when replacing the complete drive would require control-system modifications, mechanical changes, or a new commissioning cycle.
- Plant Spare Inventory: Facilities with several high-power 1336STEF G-Frame drives may keep a tested SP44D as a critical spare rather than waiting for a board after a production failure.
Field Case:
A large drive can appear deceptively healthy from the keypad: control power is present, status indicators respond, yet the motor does not accelerate. Before condemning SP44D, inspect the DC bus, power semiconductors, gate connections, and driver supply. A shorted IGBT or damaged gate circuit can be the original fault and can take out a replacement board during the first restart.
1336-BDB-SP44D
Related Products
- 1336-BDB-SP44A — Earlier SP44 revision for the same general 1336STEF 460 V / 350 HP G-Frame application. Rockwell identifies it as obsolete and replaced by .
- 1336-BDB-SP44C — Earlier revision of the SP44 gate-driver board. Useful for identifying an existing legacy board; is the documented replacement revision.
- 1336-BDB-SP43D — Gate-driver PCB for 1336STEF, 460 VAC, 300 HP, G-Frame. Same family and frame, but one power class lower than .
- 1336-BDB-SP45D — Gate-driver PCB for 1336STEF, 460 VAC, 400 HP, G-Frame. It is the next higher G-Frame power application and is not a routine substitute for .
- 1336-BDB-SP53D — Gate-driver PCB for 1336STEF, 460 VAC, 450 HP, G-Frame. Same broad architecture, but intended for a higher-power drive.
- 1336-BDB-SP74D — Gate-driver PCB for 1336STEF, 460 VAC, 350 HP, F-Frame. This is an especially important comparison because the horsepower and voltage match , but the frame is different.
- 1336-BDB-SP75D — Gate-driver PCB for 1336STEF, 460 VAC, 400 HP, F-Frame. Intended for a different frame and higher power application.
- 1336-BDB-SP76D — Gate-driver PCB for 1336STEF, 460 VAC, 450 HP, F-Frame. Useful when comparing the F-Frame high-power board family against the G-Frame range.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Same 350 HP Rating Does Not Mean Same Board
The most obvious trap is versus SP74D. Both are documented for 350 HP, 460 V, but is G-Frame, while SP74D is F-Frame.
How to avoid it: Match the complete drive catalog number and frame designation—not just voltage and horsepower.
⚠️ Do Not Assume Every 1336-BDB Board Is Interchangeable
SP43D, , SP45D and SP53D belong to the same G-Frame family but correspond to different power levels: 300, 350, 400 and 450 HP, respectively.
How to avoid it: Photograph the installed board label before removal and retain the complete SP number on the purchase order.
⚠️ Find the Original Power-Stage Fault First
The gate-driver board directly interacts with the drive’s switching devices. If an IGBT, gate circuit, or driver supply is already damaged, a replacement PCB can become the second casualty.
How to avoid it: Apply lockout/tagout, verify DC-bus discharge, inspect the switching devices and gate wiring, check driver supply rails, and perform controlled testing before full-power operation.
Frequently Asked Questions (FAQ)
What is Allen-Bradley 1336-BDB-?
It is a gate-driver PCB for the Allen-Bradley 1336STEF drive family, specifically documented for 460 VAC, 350 HP, G-Frame applications.
What drive configuration uses 1336-BDB-?
The documented configuration is:
- Drive family: 1336STEF
- Voltage: 460 VAC
- Power: 350 HP
- Frame: G-Frame
- Function: Gate-driver PCB
- Quantity: 1 kit per drive
These identifiers should be treated as the compatibility baseline.
Can 1336-BDB-SP44C be replaced with ?
Yes. Rockwell’s spare-parts documentation explicitly lists 1336-BDB-SP44A/C as obsolete and replaced by 1336-BDB-.
Still verify the complete host-drive configuration before installation, particularly on an older cabinet that may have undergone previous board substitutions.
Can I use 1336-BDB-SP74D instead?
Not as a routine substitution. Both boards are listed for 350 HP / 460 V, but is G-Frame and SP74D is F-Frame. Frame-specific power-stage architecture matters.
Is 1336-BDB- a complete VFD?
No. It is an internal gate-driver PCB. It does not constitute the complete 1336 drive, main control assembly, power semiconductor assembly, enclosure, or motor interface.
What should I request when purchasing a refurbished ?
Ask for:
- Actual PCB photographs.
- Clear identification.
- PCB revision information.
- Connector inspection.
- Evidence of inspection for heat damage and oxidation.
- Gate-drive functional test results.
- Test configuration or host-drive information.
- Test report.
- Warranty terms.
For this type of board, “powers on” is a weak acceptance criterion. The important question is whether the gate-drive circuitry was actually tested.
Is still a current production component?
It should be treated as a legacy spare. Rockwell’s published spare-parts documentation establishes as the replacement for the obsolete SP44A/C versions.
For procurement, specify the complete identifier and require photographs and test evidence before accepting surplus or refurbished inventory.
