onsemi 1PMT5936BT1

Overview

1PMT5936BT1 from onsemi is a 3.2 W surface-mount Zener diode in the POWERMITE® (DO−216AA) package, with nominal Zener voltage 30 V (min 28.5 V, max 31.5 V) at 12.5 mA test current, 750 Ω dynamic impedance at IZT, and 1.0 µA reverse leakage at 22.8 V. It delivers low-profile thermal performance (1.1 mm height, 23 °C/W junction-to-cathode thermal resistance) for voltage regulation in space-constrained portable power rails.

For engineers reviewing the 1PMT5936BT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 30 V Zener tolerance, 3.2 W dissipation at cathode temperature of 75°C, ESD robustness (>16 kV HBM), and compatibility with automated SMT assembly using 12 mm tape-and-reel (12,000 units/reel, T3 variant).

Technical Context

The 1PMT5936BT1 operates as a precision shunt voltage regulator, maintaining stable output voltage across variable load currents via controlled reverse breakdown. Its Zener voltage exhibits a positive temperature coefficient above ~5 V, and its 750 Ω impedance at 12.5 mA reflects moderate regulation stiffness suitable for non-critical biasing and overvoltage clamping.

Thermally, it relies on cathode tab conduction (R_Jcathode = 23 °C/W) rather than ambient convection (R_JA = 248 °C/W), requiring PCB copper land design to sustain full 3.2 W dissipation. The DO−216AA package's full metallic bottom eliminates flux entrapment and supports reliable reflow soldering at 260°C for 10 seconds.

Key Specifications

Pinout & Package

Package: POWERMITE® (JEDEC DO−216AA), plastic surface-mount case 457, with integral heat sink tabs and full metallic bottom. Cathode indicated by polarity band; lead orientation places cathode (short lead) toward sprocket holes in tape.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4745A and MMSZ5256ET1G, the 1PMT5936BT1 uniquely balances 3.2 W power handling, ultra-low profile, and cathode-thermal-path optimization-making it the only choice for high-density, thermally demanding 30 V regulation in modern portable electronics.

Availability

1PMT5936BT1 is available at Aetrix Electronics and suitable for cellular phone power management, USB-C port overvoltage protection, and industrial sensor signal conditioning requiring stable component supply with consistent thermal performance and RoHS-compliant packaging.

Supply support for 1PMT5936BT1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 1PMT5920B Series-including 1PMT5936BT1-is engineered specifically for compact, high-reliability voltage regulation in portable and space-constrained systems, emphasizing thermal efficiency, ESD resilience, and SMT manufacturability.

FAQ

What is the Zener voltage tolerance of the 1PMT5936BT1 at its rated test current?

The 1PMT5936BT1 has a Zener voltage range of 28.5 V to 31.5 V at I_ZT = 12.5 mA, corresponding to a ±5% tolerance about the nominal 30 V value. This tolerance is guaranteed per the onsemi datasheet and applies under thermal equilibrium at 25°C ambient. The 1PMT5936BT1 maintains this specification across its qualified operating temperature range when properly mounted with adequate cathode thermal conduction.

Can the 1PMT5936BT1 dissipate its full 3.2 W rating on a standard FR-4 PCB without a heatsink?

No-the 3.2 W rating for the 1PMT5936BT1 is specified only when the cathode tab is maintained at 75°C, requiring a thermally optimized PCB layout with copper pour and possibly thermal vias. On a standard FR-4 board with minimal copper, derating is necessary; typical ambient-limited dissipation is ~0.5 W. The 1PMT5936BT1 achieves full 3.2 W only when its cathode thermal path is engineered per onsemi's recommended pad dimensions and mounting guidelines.

Is the 1PMT5936BT1 compatible with lead-free reflow soldering profiles?

Yes-the 1PMT5936BT1 is rated for lead-free reflow soldering at 260°C for up to 10 seconds, matching IPC/JEDEC J-STD-020 requirements. Its thermosetting plastic case and corrosion-resistant leads ensure reliability under these conditions. Pb-free variants (e.g., 1PMT5936BT3G) are also available, and the 1PMT5936BT1 itself meets RoHS compliance when processed per onsemi's soldering recommendations.

How does the ESD rating of the 1PMT5936BT1 impact system-level design?

The 1PMT5936BT1 features Class 3 HBM ESD protection (>16 kV), eliminating the need for discrete TVS diodes in many portable interface circuits. This simplifies BOM count and board area in applications like USB-C port protection or cellular antenna switch control lines. Because the 1PMT5936BT1 inherently withstands high-voltage human-body discharges, system-level ESD testing margins improve without adding series impedance or response delay from external protectors.

What is the significance of the "T3" suffix in the 1PMT5936BT1 part number?

"T3" denotes the packaging configuration: 12,000 units per 12 mm tape-and-reel. This contrasts with "T1", which specifies 3,000 units per reel. The 1PMT5936BT1 T3 variant is optimized for high-volume SMT production, supporting automated pick-and-place with standardized sprocket hole alignment and cathode-first orientation. Both T1 and T3 share identical electrical and thermal specifications-the 1PMT5936BT1 device itself is unchanged.