Microchip Technology UPTB5/TR13

Overview

UPTB5/TR13 from Microsemi is a bi-directional transient voltage suppressor (TVS) diode in Powermite surface-mount package, rated for 5 V stand-off voltage, 6.0 V minimum breakdown voltage at 1 mA, 9.5 V maximum clamping voltage at 10 A, 1000 W peak pulse power (8×20 µs), and 2.5 W continuous power dissipation - used for ESD and surge protection on low-voltage DC rails in industrial control interfaces.

For engineers reviewing the UPTB5/TR13 datasheet, UPTB5/TR13 pinout, UPTB5/TR13 application, or UPTB5/TR13 equivalent, key selection criteria include clamping voltage margin vs. protected IC V_CC, bidirectional polarity requirement for AC-coupled or floating lines, and thermal performance under repeated surge events per IEC 61000-4-5.

Technical Context

The UPTB5/TR13 implements a zener-based avalanche structure with oxide-passivated junctions, enabling stable breakdown behavior and negligible degradation after repeated 8×20 µs surges. Its bi-directional configuration supports symmetrical clamping on differential or ungrounded signal paths without polarity constraints.

Thermal design leverages the full metallic bottom and integral locking tab as a heatsink, improving steady-state power handling beyond standard SMD TVS devices. The device meets IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity requirements when applied with appropriate PCB copper area and trace routing.

Key Specifications

Pinout & Package

UPTB5/TR13 is housed in Microsemi's Powermite surface-mount package - a compact, thermally enhanced SMD outline with full metallic bottom and integral locking tabs for mechanical retention and heat spreading. No discrete pins; two terminals are co-planar solder pads on opposite ends of the rectangular body.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with SMBJ5.0CA and P6SMB5.0CA, UPTB5/TR13 delivers tighter clamping (9.5 V vs. 11.2 V), superior thermal management via metallic bottom, and lower leakage - making it optimal for space-constrained, high-reliability 5 V rail protection where voltage margin and surge endurance are critical.

Availability

UPTB5/TR13 is available at Aetrix Electronics and suitable for industrial serial interface protection, low-voltage sensor signal line protection, USB port ESD protection, and DC power rail surge suppression requiring stable component supply and long-term manufacturability.

Supply support for UPTB5/TR13 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

Microsemi (now part of Microchip Technology) is a semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The UPTB5/TR13 belongs to the Powermite UPT series - engineered specifically for high-surge, low-clamping surface-mount TVS applications where thermal robustness and bi-directional symmetry are essential in harsh environments.

FAQ

What is the polarity configuration of UPTB5/TR13?

UPTB5/TR13 is a bi-directional TVS diode, meaning its two terminals are functionally identical and provide symmetrical clamping for both positive and negative transients. This eliminates orientation concerns during PCB layout and makes it ideal for protecting AC-coupled or floating differential lines such as RS-485 or CAN bus. The device has no anode/cathode marking and operates identically regardless of voltage polarity applied across UPTB5/TR13.

Does UPTB5/TR13 meet IEC 61000-4-5 surge immunity standards?

Yes, UPTB5/TR13 supports compliance with IEC 61000-4-5 Level 4 (4 kV line-to-ground) when implemented with proper PCB layout - including minimum 1 oz copper pour under the metallic bottom and short, low-inductance traces to protected nodes. Its 1000 W peak pulse power rating at 8×20 µs directly enables this level of surge handling, and test reports confirm robust performance across 1000+ surge cycles without parameter shift in UPTB5/TR13.

How does the metallic bottom of UPTB5/TR13 improve thermal performance?

The full metallic bottom of UPTB5/TR13 provides a low-thermal-resistance path from the silicon junction to the PCB copper plane, reducing steady-state junction temperature rise by approximately 30% compared to standard plastic-body SMD TVS devices. This allows UPTB5/TR13 to sustain its 2.5 W continuous power rating more reliably and improves long-term reliability under repeated surge stress - a key advantage confirmed in Microsemi's thermal characterization data for UPTB5/TR13.

What is the maximum leakage current of UPTB5/TR13 at rated stand-off voltage?

The maximum leakage current of UPTB5/TR13 is 50 µA at its 5 V stand-off voltage and 25°C ambient temperature. This low leakage ensures minimal impact on battery life in portable systems and avoids signal offset errors in precision analog circuits. Measured values remain stable across temperature and time, with no significant increase observed after 1000 surge events - a specification verified in the official UPTB5/TR13 electrical characteristics table.

Can UPTB5/TR13 be used as a direct replacement for unidirectional TVS diodes like UPT5/TR13?

No - UPTB5/TR13 is bi-directional and cannot replace unidirectional devices like UPT5/TR13 in circuits requiring polarity-specific clamping, such as DC power rail protection with ground-referenced transients. While both share the same stand-off voltage and package, UPTB5/TR13 conducts for both polarities, which may cause unintended conduction in single-supply designs. Always verify system-level polarity requirements before substituting UPTB5/TR13 for UPT5/TR13 or other unidirectional variants.