KTA1137AEUAB-TR - 30W 802.3at PoE PD Controller | Kinetic
MPN: KTA1137AEUAB-TR ✓ Active| Qty | Unit Price | Extended |
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KTA1137AEUAB-TR Overview
A Power over Ethernet Powered Device controller is the interface IC that performs PD detection, classification, and inrush current limiting when a device such as an IP camera, wireless access point, or VoIP phone draws power from Ethernet cabling. It sits within the power management IC hierarchy, combining the PoE handshaking front end and a switching power supply controller in a single CMOS die, which removes the need for a separate PWM controller in many designs.
Key features include compliance to both IEEE 802.3af (13W) and IEEE 802.3at (30W) power classes, an integrated DC-DC controller optimized for isolated and non-isolated converter topologies, and single-chip CMOS integration that reduces bill-of-materials count. According to Kinetic Technologies product documentation, the KTA1137A family is a highly integrated solution for PoE Powered Devices requiring input power of up to 30 watts.
On the technical side, the device supports flyback converter topologies; the manufacturer evaluation board (KTA1137AEUAB-MMEV02) demonstrates a 12V, 25W flyback converter for PD applications, confirming real-world performance near the full 30W capability. The integrated controller architecture simplifies transformer-based isolated designs as well as non-isolated buck-derived converters.
Typical applications include IP security cameras, 802.11ac/ax wireless access points, VoIP telephones, network switches with PD ports, and building automation endpoints that must be powered entirely over standard Ethernet cabling.
A key design consideration is that the KTA1137A is pin compatible with the discontinued AS1138, so engineers migrating legacy AS1138-based PD designs can substitute with minimal PCB rework. Verify transformer specifications against the target output power class.
This page synthesizes distributor availability data, the AS1138 pin-compatibility cross-reference, and practical design context not found in the manufacturer datasheet alone.
Drop-in alternatives for KTA1137AEUAB-TR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AS1138
✅ Drop-In📋 Reference alternative (not in catalog)
KTA1137AEUAB-TR Maximum Ratings & Electrical Characteristics
| Function | PoE PD Controller with Integrated DC-DC Controller |
| PoE Standards Supported | IEEE 802.3at (PoE+), IEEE 802.3af (PoE) |
| Number of Channels | 1 |
| Maximum Input Power | 30 W |
| Power Classes | 13 W (802.3af) / 30 W (802.3at) |
| Supported Topologies | Isolated and non-isolated flyback converter |
| Process Technology | CMOS |
| Package | 20-TQFN (5x5 mm) |
| Mounting Type | Surface Mount |
| EVB Reference Design | 12 V, 25 W flyback converter (KTA1137AEUAB-MMEV02) |
| Pin Compatibility | Compatible with discontinued AS1138 |
| Category Classification | Power Switch ICs - POE / LAN |
| RoHS Status | unknown |
| Packaging | Tape and Reel (-TR suffix) |
KTA1137AEUAB-TR 20-tqfn (5x5 mm) Pin Configuration Guide
Pin configuration for KTA1137AEUAB-TR (20-tqfn (5x5 mm) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for KTA1137AEUAB-TR.
Refer to the datasheet for full pin configuration.
Typical Applications
KTA1137AEUAB-TR is suitable for 6 applications: IP Security Cameras, Wireless Access Points, VoIP Telephones, Building Automation and Access Control, Networked LED Lighting Fixtures, Legacy AS1138 Design Migration.
IP Security Cameras
The KTA1137AEUAB-TR fits outdoor and indoor IP camera designs that must be powered entirely over a single Ethernet cable. Its IEEE 802.3at compliance delivers up to 30W at the powered device, covering PTZ cameras with heaters and IR illuminators that exceed the 13W limit of 802.3af, while remaining backward compatible with 802.3af switches. The integrated DC-DC controller drives a flyback converter, such as the 12V, 25W reference design shown on the KTA1137AEUAB-MMEV02 evaluation board, converting the 37V to 57V PoE input to camera rail voltages. Single-chip CMOS integration reduces BOM count in space-constrained camera housings, and the PD interface handles detection, classification, and inrush limiting required for standards compliance.
Recommended
Wireless Access Points
802.11ac and 802.11ax enterprise access points commonly draw 15W to 30W and must be powered from a single Cat5e/6 cable, making an 802.3at PD interface mandatory. The KTA1137AEUAB-TR provides detection, classification, and inrush current control per IEEE 802.3at (PoE+), and its integrated DC-DC controller converts the 48V nominal PSE voltage down to the AP's internal rails through an isolated or non-isolated flyback stage. Supporting both 13W (802.3af) and 30W (802.3at) classes lets one hardware platform serve both standard and high-power AP SKUs. The 5x5 mm 20-TQFN package conserves PCB area inside compact ceiling-mount enclosures, and the single-chip CMOS architecture reduces component count versus discrete PD controller plus separate PWM controller solutions.
Recommended
VoIP Telephones
PoE-powered business phones are classic 802.3af (Class 3, up to 13W) devices, and the KTA1137AEUAB-TR handles the full PD interface: signature detection, power classification, and controlled inrush when the PSE applies power. With the 802.3at capability also supported, the same design scales to color touch-display phones or phones with Wi-Fi coexistence that approach 30W. The integrated DC-DC controller runs a flyback topology producing the 3.3V/5V logic rails and audio subsystem supplies from the -48V pair, analogous to the manufacturer's 12V, 25W EVB demonstration. Pin compatibility with the discontinued AS1138 allows existing phone platforms designed around that part to migrate with minimal PCB effort, protecting long-lifecycle enterprise telephony products from EOL risk.
Recommended
Building Automation and Access Control
Door controllers, card readers, sensors, and HVAC zone controllers increasingly use PoE to avoid dedicated AC wiring. The KTA1137AEUAB-TR accepts power from any compliant 802.3af or 802.3at switch, performing PD detection and classification automatically, and its integrated DC-DC controller generates the system rails through a flyback converter, supporting isolated designs needed where the Ethernet cable must remain galvanically separated from user-touchable circuitry. The up-to-30W input range covers both standard sensors (well under 13W) and heavier loads such as electric-strike door controllers. The 20-TQFN 5x5 mm surface-mount package suits compact controller boards, and the CMOS single-chip architecture keeps BOM cost and assembly complexity low for high-volume building-products manufacturing.
Recommended
Networked LED Lighting Fixtures
PoE lighting systems deliver both data and power to LED fixtures over structured cabling. The KTA1137AEUAB-TR serves as the PD front end, negotiating 13W (802.3af) or up to 30W (802.3at) from the PSE and controlling the downstream converter. Its integrated DC-DC controller drives a flyback stage that steps the 37V-57V PoE input down to LED string supply voltages, mirroring the topology validated in the 12V, 25W EVB design. Isolated and non-isolated topologies are both supported, letting fixture designers choose the safety isolation approach that matches the installation class. The single-chip solution replaces a discrete PD interface plus separate PWM controller, reducing fixture electronics size and improving reliability in enclosed luminaires with limited airflow and tight thermal budgets.
Recommended
Legacy AS1138 Design Migration
Products originally designed around the austriamicrosystems/ams AS1138 PoE PD controller face end-of-life sourcing risk because that part is discontinued. Wurth Elektronik's reference documentation confirms the Kinetic Technologies KTA1137A is pin compatible with the AS1138 and may be substituted with minimal effort, making the KTA1137AEUAB-TR the direct migration path. Because the package and pinout match, the existing PCB land pattern is retained and no respin is required in most cases. Engineers should verify the compensation network and transformer parameters against the Kinetic datasheet for their specific output power level, using the 12V, 25W KTA1137AEUAB-MMEV02 evaluation board as a validation vehicle before committing to a production substitution.
Recommended
Recommended Products Summary
Engineering reference data for KTA1137AEUAB-TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AS1138 |
|---|---|---|
| Package | 20-TQFN (5x5 mm) | 20-TQFN (5x5 mm) - same |
| Brand | Kinetic Technologies | ams (austriamicrosystems) |
| PoE Standards | IEEE 802.3at (PoE+), 802.3af (PoE) | IEEE 802.3at (PoE+), 802.3af (PoE) |
| Maximum Power | 30 W | 30 W |
| Integrated DC-DC Controller | Yes | Yes |
| Lifecycle Status | Active | Discontinued |
| Pin Compatibility | Drop-in successor to AS1138 | Pin compatible with KTA1137A |
Key Differentiators
- Single-chip integration of PD interface and DC-DC controller (vs AS1138)
- Dual-standard power coverage (13W and 30W) (vs AS1138)
- Seamless legacy migration path (vs AS1138)
Design Notes
Use the manufacturer's KTA1137AEUAB-MMEV02 evaluation board as the starting point for the power stage: it demonstrates a 12V, 25W flyback converter validated against the KTA1137A. For 802.3at designs approaching 30W, derate the transformer and output rectifier for peak power-up inrush conditions, and confirm the PSE budget accounts for cable losses (up to 12.5W of the 51W PSE allocation is lost in a 100m Cat5 run under worst-case conditions).
Place the PoE input bridge, classification resistor network, and bulk input capacitance close to the KTA1137AEUAB-TR pins, following the EVB layout in the KTA1137AEUAB-MMEV02 kit documentation. The 20-TQFN (5x5 mm) package has an exposed thermal pad that must be soldered to a grounded copper pour for heat dissipation from the integrated power switch and controller. Keep the flyback power loop (transformer primary, switch node, bulk cap) short to minimize ringing and EMI.
When substituting the discontinued AS1138 with the KTA1137AEUAB-TR, pin compatibility minimizes PCB rework but does not guarantee identical secondary-side behavior: re-verify the feedback compensation network and transformer parameters against the Kinetic datasheet before release. Also confirm your design meets IEEE 802.3af/at detection and classification signature timing; incorrect class resistor selection will cause the PSE to allocate the wrong power budget and may prevent port power-up.
Compliance Information
Compliance data was not published in the retrieved distributor or manufacturer listings; verify RoHS/REACH status on the Kinetic Technologies product page or via distributor compliance certificates.
