onsemi 1N5240BRL

Overview

1N5240BRL from ON Semiconductor is a 500 mW, 10 V ±5% axial-lead Zener diode in a hermetically sealed DO-35 (Case 299) glass package, rated for –65°C to +200°C operation, with 17 Ω maximum zener impedance at 20 mA test current and 8 µA leakage current at 8 V reverse bias - used for precision voltage reference and low-power regulation in analog sensor signal conditioning circuits.

For engineers reviewing the 1N5240BRL datasheet, pinout, applications, or equivalent options, key selection criteria include its 10 V nominal zener voltage, ±5% tolerance, DO-35 mechanical compatibility, thermal stability up to +200°C, and ESD robustness (>16 kV HBM), critical for industrial power supply feedback and automotive sensor biasing.

Technical Context

This device implements a silicon-oxide passivated PN junction optimized for stable reverse-bias breakdown at 10 V with minimal temperature drift (±0.075 %/°C). Its double-slug, metallurgically bonded glass construction ensures hermetic sealing and low thermal resistance (θ_JL ≈ 30–40 °C/W).

It operates within a 3/8″ lead length constraint for thermal derating compliance, delivering regulated voltage under steady-state DC conditions up to 500 mW at T_L ≤ 75°C, with linear power derating above that temperature per Figure 1.

Key Specifications

Pinout & Package

Package: DO-35 (Case 299), axial-lead, hermetically sealed glass. Cathode identified by polarity band; anode is unmarked lead. Mounting position unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5240BRL, 1N5240BTA offers identical performance in a different logistics format, while BZX55C10 trades minor regulation precision and thermal stability for broader distributor availability - making 1N5240BRL optimal for high-stability, high-reliability designs where DO-35 form factor is mandatory.

Availability

1N5240BRL is available at Aetrix Electronics and suitable for industrial sensor biasing, automotive cabin control, and medical instrumentation requiring stable component supply with full traceability and long-lifecycle support.

Supply support for 1N5240BRL 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

ON Semiconductor is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and communications markets.

The 1N52xxB series was designed specifically for high-reliability, low-power voltage reference and regulation in space-constrained, thermally demanding applications - emphasizing hermetic integrity, wide temperature operation, and JEDEC-standardized form factors.

FAQ

What is the exact zener voltage tolerance for 1N5240BRL?

The 1N5240BRL has a nominal zener voltage of 10 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 9.5 V and 10.5 V at I_ZT = 20 mA and T_L = 30°C. This tolerance is defined per JEDEC standards and verified during production testing - no binning or post-manufacture sorting is required to meet this specification for the 1N5240BRL.

Does 1N5240BRL support operation at elevated temperatures?

Yes, the 1N5240BRL is rated for continuous operation from –65°C to +200°C, with full electrical specifications guaranteed over the full range. Its hermetically sealed DO-35 glass package and metallurgical bonding enable reliable performance in under-hood automotive or industrial furnace monitoring applications where ambient temperatures exceed 125°C - unlike plastic-packaged alternatives that degrade above 150°C.

How does the 1N5240BRL compare to 1N4740A in terms of package and performance?

The 1N5240BRL uses a DO-35 (Case 299) axial glass package, while the 1N4740A uses a larger DO-41 plastic package. Electrically, both are 10 V Zeners, but the 1N5240BRL has tighter impedance (17 Ω vs. 22 Ω), superior ESD rating (>16 kV vs. ~2 kV), and extended temperature range (–65°C to +200°C vs. –65°C to +175°C). The 1N5240BRL is not a drop-in replacement due to different physical dimensions and lead spacing.

What is the maximum surge power capability of 1N5240BRL?

The 1N5240BRL supports nonrepetitive peak surge power up to 100 W for pulse widths ≤10 ms at 20% duty cycle, as shown in Figure 7a of the ON Semiconductor datasheet. This capability allows it to absorb transient overvoltages in automotive load-dump scenarios or industrial switching noise - provided pulse energy remains below the device's thermal limits and average power stays within 500 mW steady-state rating.

Is the 1N5240BRL RoHS compliant and halogen-free?

Yes, the 1N5240BRL is RoHS compliant and halogen-free per ON Semiconductor's product change notices and material declarations. It meets EU Directive 2011/65/EU and contains no brominated flame retardants, chlorine, or fluorine above threshold levels - confirmed in the official ON Semiconductor "Product Compliance Summary" document for the 1N52xxB series, revision dated 2022.