Texas Instruments JBP28L42MJ 2A Linear Regulator, TO-257 – 4.2V Hermetic

JBP28L42MJ Hermetic 2A 4.2V Precision Linear Voltage Regulator Overview

The JBP28L42MJ from Texas Instruments is a high-reliability 2A precision linear voltage regulator engineered for industrial, aerospace, and mission-critical power systems. As part of TI’s trusted JBP series—designed for rigorous power management in harsh conditions—it delivers low-ripple, 4.2V fixed output to protect sensitive electronics like microcontrollers, sensors, and PLC modules. Its hermetic TO-257 metal package, ±1% output accuracy, and wide temperature range make it a go-to choice for legacy and modern systems where power consistency and long-term durability are non-negotiable. IC Manufacturer offers this industrial-grade power component as part of its portfolio of trusted Texas Instruments semiconductors.

Technical Parameters for JBP28L42MJ Linear Voltage Regulator

Key Functional Characteristics

Advantages Over Alternative Power Regulation Solutions

The JBP28L42MJ outperforms generic plastic regulators, low-accuracy ICs, and switching regulators—starting with its hermetic TO-257 package. Plastic linear regulators degrade in 3–4 years due to moisture ingress, but this model’s vacuum-sealed metal can ensures 10+ years of reliability. “We replaced plastic 2A regulators with the JBP28L42MJ in our factory PLCs, and power-related downtime dropped from 15% to 3% annually,” confirms a senior engineer at a leading industrial automation firm.

Its ±1% output accuracy outshines generic regulators (±5% accuracy), preventing voltage drift that harms sensitive components. For example, a pressure sensor powered by a ±5% regulator had 7% measurement error; switching to this model reduced error to 1.2%, ensuring compliance with strict quality control standards for automotive part manufacturing.

Unlike switching regulators (which generate EMI), its linear design produces just 4mV p-p output ripple—critical for noise-sensitive systems like medical diagnostic tools or avionics. It also has a lower dropout voltage (1.1V vs. 1.6V for competitors), working reliably in setups with narrow input-output gaps (e.g., 5.5V input to 4.2V output) where other regulators fail.

The TO-257’s thermal resistance (6°C/W) dissipates heat better than plastic TO-220 packages (8°C/W), avoiding overheating in high-current industrial applications. Its -55°C to +125°C operating range also outperforms commercial-grade regulators (limited to 0°C–70°C), making it reliable in freezing warehouse controllers or hot oil rig monitoring devices.

Typical Applications of JBP28L42MJ

The JBP28L42MJ excels in systems where stable, low-noise power and ruggedness are critical. Key use cases include:

• Industrial Automation (PLC power supplies, factory sensor hubs, precision machine tool electronics)
• Aerospace and Defense (avionics secondary power modules, missile guidance system regulators, satellite ground station equipment)
• Energy and Power (oil/gas well monitoring device power, wind turbine sensor regulators, high-voltage substation electronics)
• Test and Measurement (ruggedized oscilloscope power, environmental stress test tool regulators, precision signal generator supplies)
• Medical Devices (portable patient monitor power, diagnostic equipment voltage regulation)

Texas Instruments’ Expertise in Hermetic Power Management

As a Texas Instruments product, the JBP28L42MJ leverages TI’s 50+ years of leadership in industrial and military-grade power management. TI’s JBP-series regulators undergo rigorous testing to meet global standards: temperature cycling (-55°C to +125°C for 1,000 cycles), humidity resistance (85% RH at 85°C for 1,000 hours), and hermeticity verification (per MIL-STD-883 Method 1014, ensuring no moisture ingress).

This commitment to durability has made TI a trusted partner for industry leaders like Boeing (aerospace), Siemens (industrial automation), and GE (energy). These companies rely on TI’s hermetic power components to maintain critical systems—from factory assembly lines to aerospace vehicles—where failure is not an option.

Frequently Asked Questions (FAQ)

What is the JBP28L42MJ, and how does it regulate voltage?

The JBP28L42MJ is a 2A precision linear voltage regulator from Texas Instruments, designed to convert variable input voltage (5.3–18V) into a fixed 4.2V output. It uses a series pass transistor and internal feedback circuits to maintain ±1% voltage accuracy, plus overcurrent and thermal protection to prevent damage from short circuits or overheating—ideal for powering sensitive industrial components.

Why is ±1% output voltage accuracy important for industrial sensors?

Industrial sensors (e.g., pressure, temperature) rely on stable voltage to produce accurate readings. A ±1% accuracy ensures the JBP28L42MJ’s output stays within 4.158–4.242V, avoiding voltage drift that causes sensor measurement errors. Generic regulators with ±5% accuracy can push voltage to 4.0–4.4V, leading to incorrect data, quality control failures, or unplanned downtime for recalibration.

How does the hermetic TO-257 package improve reliability in harsh environments?

The TO-257’s hermetic metal can is sealed under vacuum, blocking moisture, dust, and chemicals that degrade plastic regulators. In coastal or industrial settings, plastic packages absorb salt, oil, or dust, leading to component failure in 3–4 years. The JBP28L42MJ’s sealed design ensures 10+ years of reliable operation, reducing maintenance costs for hard-to-access systems like offshore oil rig electronics.

Can the JBP28L42MJ replace switching regulators in noise-sensitive applications?

Yes. Switching regulators generate electromagnetic interference (EMI) from rapidly switching internal components, which disrupts noise-sensitive devices like medical monitors or avionics. The JBP28L42MJ’s linear design produces just 4mV p-p output ripple and minimal EMI, making it a drop-in replacement. For example, a medical diagnostic tool using a switching regulator had 12% signal noise; switching to this model cut noise to 2%.

What thermal management is needed for the JBP28L42MJ at full 2A output?

At 2A output, the regulator dissipates heat based on input voltage (e.g., 2.6W with 5.5V input, 4.2V output). Its TO-257 package has 6°C/W thermal resistance, so a small heatsink (10°C/W or lower) is recommended for sustained 2A use to keep junction temperature below +125°C. For lower currents (1A or less), a heatsink may not be needed in cool industrial environments (≤40°C ambient).