Description
Product Overview
Allen-Bradley 1336-BDB-SP49D is a gate-driver printed circuit board designed for high-power 1336STEF adjustable-frequency drives. The documented application is 575 VAC, 400 HP, G-Frame, placing this board toward the upper end of the 1336STEF G-Frame power range. The board is part of the drive’s power-stage control architecture rather than a standalone PLC or general-purpose I/O module.
In a functioning 1336 drive, the gate-driver circuitry provides the electrical interface needed to control the switching devices in the inverter section. Consequently, Allen-Bradley 1336-BDB-SP49D should be matched to the complete drive configuration rather than selected only by connector layout or physical dimensions. Rockwell’s parts list places SP49D between SP48D for 350 HP and SP54D for 450 HP, confirming that the BDB number is closely tied to the power-stage application.
For maintenance teams supporting obsolete 1336 installations, Allen-Bradley 1336-BDB-SP49D can be a useful board-level replacement when the surrounding drive hardware remains serviceable. The earlier SP49A and SP49C revisions are documented as obsolete and replaced by SP49D, making the revision history important when identifying an existing board during a repair.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1336-BDB-SP49D |
| Product Type | Gate Driver PCB |
| Drive Family | 1336STEF |
| Voltage Class | 575 VAC |
| Power Rating | 400 HP |
| Frame | G-Frame |
| Primary Function | Gate-drive control for inverter switching devices |
| Quantity per Drive | 1 kit |
| Previous Revisions | 1336-BDB-SP49A / SP49C |
| Replacement Revision | 1336-BDB- |
| Application | 1336STEF 575 V high-power drive |
| Lifecycle | Legacy / discontinued |
The official Rockwell parts list is the strongest reference for the core electrical application: 575 V, 400 HP, G-Frame.
Main Features and Advantages
High-Power G-Frame Application
1336-BDB-SP49D is specifically associated with the 400 HP, 575 V G-Frame configuration. This is important because the 1336 BDB family contains numerous visually similar boards covering different horsepower levels.
The neighboring documented G-Frame parts are:
- SP47D — 300 HP
- SP48D — 350 HP
- — 400 HP
- SP54D — 450 HP
- SP52D — 500 HP
- SP50D — 600 HP
- SP55D — 650 HP
That progression makes the complete SP designation a critical identification parameter.
Revision Replacement
Rockwell identifies 1336-BDB-SP49A/C as obsolete and specifies as the replacement.
For a plant holding an older SP49A or SP49C board, this is more useful than searching indefinitely for the original revision. The replacement should still be verified against the exact host drive before installation.
Board-Level Maintenance
Replacing the gate-driver PCB can be appropriate when the drive’s mechanical assembly, power section, control architecture, and motor installation are otherwise serviceable. It can avoid unnecessary replacement of an entire legacy drive.
The important qualification is that the gate-driver board should not be treated as an isolated failure point. A defective IGBT, abnormal DC bus, damaged gate circuit, or failed driver supply can cause a replacement board to fail during commissioning.
1336-BDB-SP49D
Application Scenarios
1336STEF 575 V Drive Repair
The primary documented application is the 1336STEF, 575 V, 400 HP, G-Frame drive configuration.
Large Motor Applications
A 400 HP adjustable-frequency drive can be found in large pumping, fan, compressor, conveyor, material-handling, and process equipment. Exact application depends on the installed 1336 drive configuration.
Legacy Plant Maintenance
For facilities with older 1336 systems, a tested can be more practical than replacing an entire drive during an outage, provided the existing power section and control architecture remain usable.
Critical Spare Stock
Because the 1336 platform is legacy equipment, maintaining verified spare boards can reduce exposure to long sourcing cycles. A spare should ideally be identified by exact part number and revision and accompanied by meaningful functional-test information.
Related Products
- 1336-BDB-SP48D — 575 V, 350 HP, G-Frame gate-driver PCB. It is the lower-power neighboring part in the documented G-Frame sequence.
- 1336-BDB-SP54D — 575 V, 450 HP, G-Frame gate-driver PCB. It is the next higher documented power application.
- 1336-BDB-SP52D — 575 V, 500 HP, G-Frame gate-driver PCB.
- 1336-BDB-SP50D — 575 V, 600 HP, G-Frame gate-driver PCB.
- 1336-BDB-SP55D — 575 V, 650 HP, G-Frame gate-driver PCB.
- 1336-BDB-SP47D — 575 V, 300 HP, G-Frame gate-driver PCB.
- 1336-BDB-SP79D — 575 V, 400 HP, F-Frame gate-driver PCB. Despite the same 400 HP rating, the frame/application is different, so it should not be treated as a direct substitute.
Engineer’s Guide: Field Pitfalls
⚠️ Do Not Match Only Voltage and Horsepower
A particularly important comparison is versus SP79D.
Both are documented around 575 V / 400 HP, but is for the G-Frame, while SP79D is for the F-Frame.
Procurement rule: Match:
Drive catalog number → voltage → horsepower → frame → BDB part number
—not merely voltage and HP.
⚠️ Do Not Confuse With SP48D
SP48D and are adjacent parts in the same 575 V G-Frame family, but they correspond to 350 HP and 400 HP, respectively.
The physical similarity of these boards is not sufficient evidence of interchangeability.
⚠️ Check the Power Stage Before Installation
If the original board failed because of a shorted power device, installing a new gate-driver board without correcting the underlying fault can produce another failure.
Before energization, maintenance personnel should verify the applicable safety procedures, DC-bus discharge, power semiconductor condition, gate connections, driver supply circuits, and board connectors.
Frequently Asked Questions
What is ?
It is an Allen-Bradley gate-driver PCB for the 1336STEF drive family, documented for 575 VAC, 400 HP, G-Frame applications.
What is the difference between SP49C and ?
Rockwell’s spare-parts documentation lists SP49A/C as obsolete and replaced by .
Therefore, if the existing board is marked SP49C, is the documented replacement revision, subject to verification against the complete host-drive configuration.
Can SP48D replace ?
Not as a routine substitution. is documented for 350 HP, while is for 400 HP, both in the 575 V G-Frame family.
Can SP79D replace ?
Do not assume so. SP79D is documented for 400 HP, 575 V, F-Frame, while is 400 HP, 575 V, G-Frame. The frame difference is significant.
Is a complete VFD?
No. It is an internal gate-driver PCB. It does not include the complete 1336 drive, enclosure, main control assembly, power semiconductor assembly, or motor interface.
What should I request when buying a refurbished ?
At minimum:
- Photograph of the actual PCB.
- Clear identification.
- Revision information.
- Confirmation of the 575 V / 400 HP / G-Frame application.
- Connector inspection.
- Evidence of inspection for heat damage and corrosion.
- Functional gate-driver testing.
- Test configuration or host-drive information.
- Test report.
- Warranty terms.
A simple continuity check should not be presented as a full functional test for this type of board.
Is obsolete?
The official Rockwell spare-parts documentation identifies the older SP49A/C revisions as obsolete and replaced by . The 1336 platform itself is legacy equipment, so should be handled as a legacy spare rather than assumed to be a current-production component.
