Microchip Technology 1PMT5948BE3/TR7

Overview

1PMT5948BE3/TR7 from Microsemi is a 91 V, ±5% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 200 Ω dynamic impedance at 4.1 mA test current and <3000 µA reverse leakage at 69.2 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.

For engineers reviewing the 1PMT5948BE3/TR7 datasheet, 1PMT5948BE3/TR7 pinout, 1PMT5948BE3/TR7 application, or 1PMT5948BE3/TR7 equivalent, key selection criteria include its 91 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT placement equipment.

Technical Context

This Zener diode operates in reverse breakdown mode to regulate or clamp voltage with tight voltage tolerance and low dynamic impedance. Its full metallic bottom and integral locking tab provide direct thermal conduction to PCB copper, enabling reliable 3.0 W power handling without external heatsinking.

The device exhibits 200 Ω dynamic impedance at I_ZT = 4.1 mA and maintains <3000 µA reverse leakage at V_R = 69.2 V, supporting stable reference performance across -55°C to +150°C junction temperature range.

Key Specifications

Pinout & Package

Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with 1N5367B and SMBJ91A, the 1PMT5948BE3/TR7 uniquely combines SMT manufacturability, 3.0 W continuous dissipation via PCB-coupled thermal path, and ±5% DC voltage regulation - making it optimal for space-constrained, thermally managed DC reference and clamp roles where precision and repeatability matter.

Availability

1PMT5948BE3/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom line cards, and medical infusion pumps requiring stable component supply with full traceability and long-lifecycle support.

Supply support for 1PMT5948BE3/TR7 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 U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The Powermite® Zener diode product line delivers high-power surface-mount voltage regulation in miniature packages, designed specifically for applications demanding robust thermal performance, automated assembly compatibility, and stable DC reference accuracy under harsh environmental conditions.

FAQ

What is the Zener voltage tolerance for 1PMT5948BE3/TR7?

The 1PMT5948BE3/TR7 has a standard Zener voltage tolerance of ±5% at 91 V nominal, measured at 4.1 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the E3/TR7 variant uses the standard ±5% grade. This tolerance ensures predictable clamping behavior in overvoltage protection circuits without requiring post-production calibration.

How is thermal management handled for 1PMT5948BE3/TR7 in PCB layout?

Thermal management for 1PMT5948BE3/TR7 relies on soldering TAB 1 - the cathode terminal - directly to a large copper pour acting as a heat spreader. With a junction-to-TAB1 thermal resistance of 30°C/W, this configuration allows the 1PMT5948BE3/TR7 to safely dissipate its full 3.0 W rating at TAB 1 temperatures ≤60°C. No external heatsink is needed if ≥1 in² of 2-oz copper is connected to TAB 1 with multiple thermal vias.

Is 1PMT5948BE3/TR7 compatible with lead-free reflow processes?

Yes, the 1PMT5948BE3/TR7 is qualified for standard lead-free reflow profiles including JEDEC J-STD-020, with peak temperatures up to 260°C. Its molded Powermite® package and metallization system withstand repeated thermal cycling without delamination or parameter shift. The full metallic bottom also improves wetting and reduces void formation during Pb-free soldering, enhancing long-term interconnect reliability.

What does the "E3/TR7" suffix indicate in 1PMT5948BE3/TR7?

The "E3" denotes tape-and-reel packaging per EIA-481 standard, and "TR7" specifies a 7-inch reel containing 3,000 units - the standard shipping configuration for the 1PMT5948BE3/TR7. This format ensures compatibility with high-speed pick-and-place machines and supports just-in-time manufacturing workflows without manual repackaging.

Can 1PMT5948BE3/TR7 be used as a voltage reference in precision analog circuits?

Yes, the 1PMT5948BE3/TR7 can serve as a stable voltage reference in moderate-precision analog circuits, particularly where 91 V bias is required. Its 200 Ω dynamic impedance and <3000 µA reverse leakage at 69.2 V support predictable regulation, though designers should account for ±5% initial tolerance and temperature coefficient effects. For highest-accuracy references, supplemental trimming or feedback compensation may be needed alongside the 1PMT5948BE3/TR7.