Microchip Technology 1N4755CP/TR12

Overview

1N4755CP/TR12 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal Zener voltage of 43 V, ±5% tolerance (A suffix), plastic DO-41 package, and rated for operation from –65 °C to +150 °C. It regulates voltage in power supply reference and overvoltage protection circuits where stable 43 V clamping is required at 6.0 mA test current.

For engineers reviewing the 1N4755CP/TR12 datasheet, 1N4755CP/TR12 pinout, 1N4755CP/TR12 application, or 1N4755CP/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (1500 mA), reverse leakage (<5 μA at 32.7 V), and RoHS-compliant "e3" plating with tape-and-reel packaging (TR12).

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain a stable 43 V reference across a wide current range (0.25–110 mA), with dynamic impedance of 70 Ω at 6.0 mA and knee impedance of 22 Ω at 0.25 mA. Its DO-41 plastic package delivers lower thermal resistance than glass-body variants and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.

Designed for DC voltage regulation and transient suppression, it exhibits low ESD sensitivity (MIL-STD-750 Method 1020), forward voltage ≤1.2 V at 200 mA, and is rated for 260 °C soldering (10 s). The cathode band denotes polarity, requiring the banded end to be biased positive for Zener operation.

Key Specifications

Pinout & Package

DO-41 (DO-204AL) plastic axial-lead package with void-free UL94V-0 epoxy body and matte-tin (RoHS e3) or Sn/Pb plating. Cathode identified by single black band; anode is unmarked lead.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4755A and MMBZ5265BS-7-F, the 1N4755CP/TR12 uniquely combines 1 W power capability, DO-41 mechanical robustness, and TR12 automation readiness-making it optimal for industrial power supply and protection designs requiring proven reliability and production scalability.

Availability

1N4755CP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom voltage clamping, and battery management systems requiring stable component supply and long-term lifecycle support.

Supply support for 1N4755CP/TR12 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 RF solutions for aerospace, defense, and industrial markets.

The 1N47xxAP Zener series was engineered for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal stability, surge resilience, and JEDEC-standardized performance across military and commercial temperature ranges.

FAQ

What is the Zener voltage tolerance of the 1N4755CP/TR12?

The 1N4755CP/TR12 has a nominal Zener voltage of 43 V with a ±5% tolerance, indicated by the "A" suffix in its part number per JEDEC registration. This means the actual measured V_Z falls between 40.85 V and 45.15 V when tested at 6.0 mA and 25 °C lead temperature. The tolerance remains valid across the full operating temperature range of –65 °C to +150 °C, as confirmed in Microsemi's 1N4728AP–1N4764AP datasheet Rev C.

Does the 1N4755CP/TR12 support lead-free soldering processes?

Yes, the 1N4755CP/TR12 features RoHS-compliant "e3" termination with annealed matte-tin plating, qualified for lead-free reflow up to 260 °C for 10 seconds per MIL-STD-750 Method 2026. Its UL94V-0 epoxy body and thermal design accommodate standard Pb-free assembly without delamination or parametric shift, making it fully compatible with modern electronics manufacturing requirements.

What is the maximum steady-state current the 1N4755CP/TR12 can regulate continuously?

The 1N4755CP/TR12 supports a maximum regulator current (I_ZM) of 110 mA at T_A = 50 °C when mounted on FR4 with specified copper pads. At 25 °C ambient, its 1.0 W power rating allows up to ~23.3 mA continuous current (P = V_Z × I_Z → 1.0 W / 43 V), but derating applies above 45 °C ambient per Figure 1 in the datasheet. Always verify thermal layout against the 45 °C/W junction-to-lead resistance.

How does the "TR12" suffix affect packaging and handling of the 1N4755CP/TR12?

The "TR12" suffix indicates EIA-296 standard tape-and-reel packaging with 12 mm carrier tape width, enabling automated pick-and-place insertion despite the axial-lead DO-41 form factor. Each reel contains 10,000 units, and the carrier tape provides static-dissipative protection and precise component indexing. This differs from bulk or ammo-pack versions (e.g., 1N4755A) and is essential for high-volume SMT line integration.

Is the 1N4755CP/TR12 suitable for surge protection in 48 V DC systems?

Yes, the 1N4755CP/TR12 is rated for 1500 mA non-repetitive surge current (½-sine, 1/120 s) at 25 °C, making it appropriate for clamping transient overvoltages on 48 V rails-such as those caused by inductive switching or load dump. Its 43 V Zener voltage provides ~5 V margin below 48 V nominal, and its 1 W power rating sustains brief energy absorption without thermal runaway when properly heatsinked or lead-length optimized.