STMicroelectronics PEP01-5841

Overview

PEP01-5841 from STMicroelectronics is a quad unidirectional TVS diode array in SO-8 package, designed specifically for overvoltage protection of Power over Ethernet (PoE) power sourcing equipment (PSE). It features 58 V stand-off voltage, 100 V clamping voltage at 24 A, 2.7 kW peak pulse power (8/20 μs), and integrates four 55 pF decoupling capacitors per channel for supply stabilization in IEEE 802.3af/at-compliant systems.

For engineers reviewing the PEP01-5841 datasheet, PEP01-5841 pinout, PEP01-5841 application, or PEP01-5841 equivalent, this device addresses PoE PSE front-end surge immunity (IEC61000-4-2 ±15 kV air / ±8 kV contact; IEC61000-4-5 level 2 ±1 kV), low-leakage operation (0.2 μA @ 25 °C), and compatibility with PMOS-based PSE controllers requiring tight clamping headroom.

Technical Context

The PEP01-5841 implements four independent unidirectional Transil structures in a single SO-8 package, each with integrated 55 pF decoupling capacitance to suppress high-frequency noise on PoE power lines. Its planar silicon technology ensures stable breakdown behavior across –55 °C to +150 °C junction temperature range.

It operates as a primary-level transient suppressor between the PSE controller and external PMOS switch or integrated PMOS output stage, clamping surges before they reach sensitive gate drivers. The COM pins (2, 3, 6, 7) are internally tied to substrate and must be externally connected to system ground to ensure proper thermal dissipation and ESD current return path integrity.

Key Specifications

Pinout & Package

PEP01-5841 is housed in a JEDEC-registered SO-8 package (4.9 mm × 6.0 mm × 1.25 mm height), compliant with IPC-7531 footprint standards and optimized for high-voltage clearance (>50 V) via extended pad spacing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE PSE protection applications.

Compared with SMAJ58A and SP1003-058, PEP01-5841 uniquely combines quad unidirectional protection, integrated 55 pF capacitance per channel, and SO-8 packaging-reducing component count by ≥50%, minimizing parasitic inductance, and enabling direct placement at PMOS drain nodes in space-constrained PSE modules.

Availability

PEP01-5841 is available at Aetrix Electronics and suitable for IEEE 802.3af/at PSE controller designs, multi-port PoE switches, and industrial PoE injectors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant ECOPACK packaging.

Supply support for PEP01-5841 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with strong IP in protection devices and analog front-ends.

PEP01-5841 belongs to ST's Power Over Ethernet Protection portfolio, engineered specifically to meet IEEE 802.3af/at surge immunity requirements while simplifying PSE board layout through integrated capacitance and quad-channel integration.

FAQ

What is the maximum peak pulse current the PEP01-5841 can handle?

The PEP01-5841 sustains 24 A peak pulse current (8/20 μs waveform) at 100 V clamping voltage, corresponding to its 2.7 kW peak pulse power rating. This value is validated per IEC61000-4-5 level 2 testing conditions and remains stable up to 150 °C junction temperature, as confirmed in DS6245 Rev 5 Figure 5.

Can the COM pins be left floating or partially connected?

No. Pins 2, 3, 6, and 7 are internally connected cathodes and must all be soldered to a low-impedance PCB ground plane. Floating or partial connection degrades clamping performance, increases thermal resistance, and risks catastrophic failure during surge events due to uncontrolled current return paths.

Does the integrated 55 pF capacitance affect high-speed Ethernet data integrity?

No. The 55 pF capacitance is placed only on the DC power lines (not data pairs), and its frequency roll-off begins above 10 MHz-well beyond the 100 MHz bandwidth of 100BASE-TX and 1 GbE signals. ST confirms no impact on MDI signal integrity in application note AN4778.

Is PEP01-5841 compatible with IEEE 802.3bt (PoE++) systems?

Yes, for Type 3 (60 W) applications. Its 58 V standoff and 100 V clamping align with the higher voltage margins required by 802.3bt PSE stages. However, for Type 4 (90 W) systems using 57 V nominal, verify system-level clamping headroom with PSE controller VDS(max) ratings, as 100 V clamping leaves <3 V margin at 97 V surge peaks.