Microchip Technology 1PMT5927C/TR7

Overview

1PMT5927C/TR7 from Microsemi is a 12 V, ±1% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 6.5 Ω dynamic impedance at 31.2 mA test current and thermal resistance of 30°C/W junction-to-TAB1 - used for precision voltage regulation and overvoltage protection in compact DC-DC converter feedback loops.

For engineers reviewing the 1PMT5927C/TR7 datasheet, 1PMT5927C/TR7 pinout, 1PMT5927C/TR7 application, or 1PMT5927C/TR7 equivalent, key selection criteria include tight voltage tolerance (±1%), low dynamic impedance, ESD robustness (>16 kV HBM), full metallic bottom for flux-free assembly, and compatibility with automated insertion equipment.

Technical Context

This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external biasing. Its Powermite® package integrates a locking tab that functions as both mechanical anchor and thermal path to PCB copper, enabling efficient heat transfer at 30°C/W junction-to-TAB1.

The device delivers stable 12 V regulation under 31.2 mA test current (IZT), with knee current IZK = 0.25 mA and knee impedance ZZK = 550 Ω - ensuring reliable turn-on behavior in low-current standby modes while maintaining low dynamic impedance across its operating range.

Key Specifications

Pinout & Package

Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode identified by TAB 1; mounting position unrestricted; weight ≈ 0.016 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF12A and BZX84-C12, the 1PMT5927C/TR7 uniquely combines ±1% tolerance, 3.0 W continuous dissipation, 6.5 Ω dynamic impedance, and integrated thermal tab - making it the only option among the three qualified for precision, high-power, thermally anchored shunt regulation.

Availability

1PMT5927C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical sensor interfaces, and telecom DC-DC converters requiring stable component supply with traceable lot control and extended lifecycle support.

Supply support for 1PMT5927C/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 was engineered for high-power density surface-mount voltage regulation in thermally demanding environments - emphasizing mechanical robustness, ESD resilience, and stable parametric performance across military-grade temperature ranges.

FAQ

What is the Zener voltage tolerance for 1PMT5927C/TR7?

The "C" suffix in 1PMT5927C/TR7 denotes ±1% Zener voltage tolerance at 31.2 mA test current and 30°C case temperature. This tighter tolerance is achieved through post-package screening and is documented in Microsemi's MSC0995 datasheet revision F. The standard version (1PMT5927B/TR7) offers ±5%, while "D" suffix provides ±0.5%. 1PMT5927C/TR7 maintains this accuracy across its specified junction temperature range of –55°C to +150°C.

How is thermal management implemented in the 1PMT5927C/TR7 Powermite® package?

The 1PMT5927C/TR7 uses TAB 1 as both cathode and primary thermal conduction path, with a specified junction-to-TAB thermal resistance of 30°C/W. Its full metallic bottom and integral locking tab enable direct thermal coupling to PCB copper pours. For full 3.0 W dissipation, Microsemi specifies TAB 1 temperature must be held at ≤60°C - achievable via ≥1 in² of 2 oz copper connected to TAB 1 with ≥4 thermal vias. 1PMT5927C/TR7 does not require external heatsinks when properly mounted.

Is 1PMT5927C/TR7 compatible with lead-free reflow processes?

Yes, 1PMT5927C/TR7 is qualified for lead-free reflow per J-STD-020 Rev E, with peak temperature rating of 260°C for 30 seconds. Its molded Powermite® package and metallization system withstand standard SAC305 profiles. The full metallic bottom also promotes uniform heating and eliminates voiding risks associated with organic substrate packages. Always verify profile using actual board mass and thermal mass - 1PMT5927C/TR7 itself imposes no process limitations beyond JEDEC Class 3 moisture sensitivity level (MSL 1).

What does the "TR7" suffix indicate in 1PMT5927C/TR7?

The "TR7" suffix indicates tape-and-reel packaging per EIA-481 standard, with 7-inch reels containing 3,000 units. This format is optimized for high-speed pick-and-place equipment and ensures consistent orientation (cathode/tab facing upward) and tension-controlled feeding. TR7 differs from TR13 (13-inch reel, 12,000 units) and bulk packaging - all variants share identical electrical and thermal specifications. 1PMT5927C/TR7 reels include humidity barrier bags with desiccant and moisture-sensitive labeling per J-STD-033.

Can 1PMT5927C/TR7 replace older through-hole Zener diodes like 1N5242B in new designs?

Yes, 1PMT5927C/TR7 can replace 1N5242B (12 V, ±5%, 500 mW) in most applications - but only after verifying thermal and layout adaptations. While both regulate at 12 V, 1PMT5927C/TR7 delivers six times the power (3.0 W vs. 0.5 W) and requires thermal anchoring to TAB 1 rather than lead-frame conduction. Its ±1% tolerance also exceeds 1N5242B's ±5%. For drop-in replacement feasibility, review PCB pad design, copper area allocation, and transient energy requirements - 1PMT5927C/TR7 is not a mechanical substitute but a functional upgrade with revised thermal design rules.