TPS2378DDA

ActivePower Over Ethernet (PoE) ControllersHSOP

IC POE CNTRL 1 CHANNEL 8SOPWR

TPS2378DDA is an IEEE 802.3at Type-2 PoE PD controller in an 8-pin HSOP (PowerPAD) package. It features an internal 100 V, 0.5 Ω Hotswap MOSFET, supporting up to 0.85 A operating current with adapter priority and ESD protection.Checked against the datasheet

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Technical parameters

Datasheet-verified parameters

20 items

Parameter	Value and test conditions	Source
Package	HSOP (8) / SO PowerPAD (DDA), 4.89 mm × 3.90 mm
Operating Temperature	-40 to 85 °C
RoHS	Yes
Recommended Input Voltage Range	RTN, VDD: 0 V to 57 V
Absolute Maximum Input Voltage	VDD, DEN: -0.3 V to 100 V; RTN: -0.6 V to 100 V
Recommended Junction Temperature	-40 °C to 125 °C
Storage Temperature	-65 °C to 150 °C
Maximum Operating Current	0.85 A (RTN sinking current)
Current Limit	Min 0.85 A, Typ 1 A, Max 1.2 A (V_RTN = 1.5 V)
Inrush Current Limit	Min 100 mA, Typ 140 mA, Max 180 mA (V_RTN = 2 V, V_VDD: 20 V → 48 V)
On Resistance	Min 0.2 Ω, Typ 0.42 Ω, Max 0.75 Ω
Detection Current	Typ 56.5 μA (V_DD = 1.4 V); Typ 410 μA (V_DD = 10.1 V)
Auxiliary Power Detect Threshold	Min 1.4 V, Typ 1.5 V, Max 1.6 V (V_APD rising, measure to V_RTN)
Classification Current (Type 2)	Min 38 mA, Typ 39.9 mA, Max 42 mA (R_CLS = 63.4 Ω)
ESD Human Body Model	2000 V (HBM, per ANSI/ESDA/JEDEC JS-001)
ESD System-level Contact Discharge	8000 V (IEC 61000-4-2 contact discharge)
ESD System-level Air-gap Discharge	15000 V (IEC 61000-4-2 air-gap discharge)
Junction-to-ambient Thermal Resistance	45.9 °C/W
Junction-to-case (bottom) Thermal Resistance	6.7 °C/W
MSL Rating	Level-2-260C-1 YEAR

All parameters (17)ExpandCollapse

Power
Current - Supply	285µA
Number of Channels	1
Power - Max	25.5 W
Voltage - Supply	0V ~ 57V
Environment and package
Mounting Type	Surface Mount
Operating Temperature	-40°C~85°C
Package	Tube
Package / Case	8-PowerSOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SO PowerPad
Other
Auxiliary Sense	Yes
Base Product Number	TPS2378
Internal Switch(s)	Yes
Mfr	Texas Instruments
Product Status	Active
Series	-
Standards	802.3at (PoE+), 802.3af (PoE)
Type	Controller (PD)

Pinout and package

DDA Package 8-Pin HSOP Top Vie… — Package: **HSOP (8) / SO PowerPAD (DDA), 4.89 mm × 3.90 mm**

Pin	Name	Function	Source
1		VDD: Connect to positive PoE input power rail. Bypass with 0.1 μF to VSS.
2		DEN: Connect 24.9 kΩ to VDD for detection. Pull to VSS disable pass MOSFET.
3		CLS: Connect resistor from CLS to VSS to program classification current.
4		VSS: Connect to negative power rail derived from PoE source.
5		RTN: Drain of PoE pass MOSFET.
6		CDB: Active low, open-drain converter disable output, referenced to RTN.
7		T2P: Active low indicates type 2 PSE connected or APD active.
8		APD: Raise 1.5 V above RTN to disable pass MOSFET and force T2P active.
Pad		Pad: The PowerPad must be connected to VSS. A large fill area is required to assist in heat dissipation.

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DatasheetDatasheet · 1.8 MB · 2026-10-29

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