onsemi 1N752A_T50R

Overview

1N752A_T50R from Fairchild Semiconductor is a 5.6 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 11 Ω dynamic impedance at 20 mA and 65 mA maximum Zener current, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N752A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal derating (4.0 mW/°C above 75°C), cathode-band polarity marking, and compliance with MIL-STD-19500/203 reliability screening per Fairchild's legacy qualification.

Technical Context

This device operates as a reverse-biased voltage reference diode, maintaining stable output voltage across load and line variations within its specified IZ range (1–65 mA). Its 11 Ω Zener impedance ensures minimal voltage deviation under dynamic current changes.

Designed for operation at junction temperatures from –65°C to +200°C, it follows standard DO-35 mechanical dimensions and uses a glass-encapsulated axial lead structure with cathode band identification. Forward voltage is guaranteed ≤1.5 V at 200 mA.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode identified by a single color band on the body; leads are tinned copper alloy, 0.46 mm diameter, 3/8″ length standard for thermal rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N752A_T50R, 1N4734A offers higher power margin but requires layout change, while BZX55-C5V6 delivers identical electrical specs with automotive qualification-making it suitable where reliability certification is mandatory.

Availability

1N752A_T50R is available at Aetrix Electronics and suitable for instrumentation reference, power supply clamp, sensor excitation, and current source bias applications requiring stable component supply and legacy semiconductor compatibility.

Supply support for 1N752A_T50R 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

Fairchild Semiconductor was a U.S.-based designer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy Zener portfolio remains widely deployed in industrial and legacy systems.

The 1N7xxA series was developed for general-purpose voltage regulation and reference in cost-sensitive, low-power analog circuits, emphasizing parameter consistency, DO-35 manufacturability, and broad temperature capability.

FAQ

What is the nominal Zener voltage of the 1N752A_T50R and how tightly is it specified?

The 1N752A_T50R has a nominal Zener voltage of 5.6 V, specified with a tolerance of ±5% at 20 mA test current. This means the actual measured V_Z falls between 5.32 V and 5.88 V under standard conditions. The tight tolerance supports use in precision reference applications where initial calibration accuracy matters, such as analog sensor signal conditioning and ADC reference generation. The 1N752A_T50R achieves this specification using process-controlled diffusion and post-trim screening.

How does thermal derating affect the 1N752A_T50R's power handling capability?

The 1N752A_T50R is rated for 500 mW power dissipation only when lead temperature (T_L) is maintained at or below 75°C. Above that temperature, power must be reduced linearly at 4.0 mW/°C. For example, at T_L = 100°C, maximum allowable power drops to 400 mW. This derating ensures junction temperature stays within the –65°C to +200°C operating limit. Proper heatsinking and lead length (standard 3/8″) are essential to maintain performance in the 1N752A_T50R.

Is the 1N752A_T50R suitable for use in automotive underhood environments?

The 1N752A_T50R supports an operating temperature range of –65°C to +200°C, which covers most underhood thermal profiles. However, it lacks AEC-Q200 qualification and formal automotive stress testing documentation. While functionally capable, it is not certified for automotive safety-critical or mission-critical subsystems. For such applications, consider the AEC-Q200-qualified BZX55-C5V6 as a drop-in alternative. The 1N752A_T50R remains appropriate for non-safety industrial or legacy automotive accessory circuits where qualification is not mandated.

What does the "T50R" suffix indicate in the 1N752A_T50R part number?

The "T50R" suffix in 1N752A_T50R denotes Fairchild's tape-and-reel packaging option: "T" = tape, "50" = 50 mm tape width, and "R" = reel. It indicates the device is supplied in industry-standard 7-inch reels with 2,000 units per reel, optimized for automated SMT placement-even though the DO-35 package is axial and typically used in through-hole assembly. This format supports mixed-technology production lines and inventory traceability. The 1N752A_T50R retains identical electrical and thermal specifications as the bulk or ammo-pack versions.

Can the 1N752A_T50R be used in forward-bias applications?

Yes-the 1N752A_T50R exhibits a forward voltage (V_F) of ≤1.5 V at 200 mA, consistent with standard silicon diodes. It can serve as a low-drop rectifier or polarity protection diode in low-current paths. However, its primary design intent and characterization focus is reverse-bias Zener operation. Forward conduction is secondary and not optimized for high-speed switching or low-loss rectification. For dedicated forward applications, purpose-built signal or Schottky diodes offer better performance. The 1N752A_T50R remains viable where dual-mode (Zener + forward) functionality simplifies BOM count.