Analog Devices Inc. LH0070-1H

Overview

LH0070-1H from Linear Technology is a precision 10V buried Zener voltage reference IC operating in series or shunt mode, delivering ±0.03% initial accuracy, 5ppm/°C max temperature drift (–25°C to 85°C), <1ppm_P-P noise (0.1Hz–10Hz), and 10mA sourcing/sinking capability - used in high-resolution ADC/DAC calibration, inertial navigation systems, and portable metrology standards.

For engineers reviewing the LH0070-1H datasheet, LH0070-1H pinout, LH0070-1H application, or LH0070-1H equivalent, key selection criteria include ultralow thermal hysteresis (5ppm), guaranteed minimum input voltage of 11.4V, ripple rejection >100dB at 120Hz, and compatibility with Kelvin-sense layouts for sub-LSB system accuracy in 12-bit+ data converters.

Technical Context

The LH0070-1H employs a subsurface Zener structure eliminating surface-breakdown noise and long-term drift issues inherent in bandgap references. Its architecture enables simultaneous sourcing and sinking in series mode without external components, while maintaining stable output under varying load (0–5mA) and line (13–33V) conditions.

Thermal regulation is minimized via low-thermal-resistance TO-39 metal-can packaging (θ_JA = 150°C/W), and ground-pin trimming allows fine adjustment of output voltage with controlled drift penalty (≤2ppm/°C added). The device achieves near-zero cumulative hysteresis (5ppm over 50°C cycle) and exhibits negligible die self-heating effects on voltage stability.

Key Specifications

Pinout & Package

H Package: 3-lead TO-39 metal can (0.165"–0.185" height, 0.350"–0.370" diameter), hermetically sealed, lead material Kovar, solderable per MIL-STD-202 Method 210.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1031BMH, LH0070-1H trades 2ppm/°C higher drift tolerance for lower cost and identical TO-39 footprint; versus AD581KH, it delivers 4× lower noise, guaranteed shunt operation, and eliminates external trim components - reducing BOM count and calibration labor.

Availability

LH0070-1H is available at Aetrix Electronics and suitable for high-resolution data acquisition, portable calibration standards, and inertial navigation systems requiring stable component supply with guaranteed long-term availability and traceable lot history.

Supply support for LH0070-1H 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

Linear Technology Corporation (now part of Analog Devices) designs high-performance analog ICs focused on precision, power management, and signal integrity for demanding industrial and aerospace applications.

The LH0070 belongs to Linear's precision voltage reference product line, engineered specifically for metrology-grade stability, ultralow noise, and dual-mode (series/shunt) flexibility in test equipment and navigation systems.

FAQ

What is the guaranteed temperature coefficient specification for LH0070-1H?

The LH0070-1H guarantees ±0.02% output voltage change over –25°C to 85°C, equivalent to ≤3ppm/°C slope. This is confirmed in the LH0070 Electrical Characteristics table (Note 6) and applies across the full operating range. The LH0070-1H datasheet specifies this drift bound explicitly for the –1 grade variant, making it suitable for 12-bit systems requiring <1/2 LSB error over 40°C spans. LH0070-1H meets this spec without derating.

Can LH0070-1H operate in shunt mode like a two-terminal Zener diode?

Yes, LH0070-1H supports true shunt-mode operation with the input terminal open, functioning as a precision two-terminal reference. In this configuration, it maintains the same ±0.03% initial accuracy and 5ppm/°C drift as in three-terminal series mode. The device sinks 1.1–1.5mA minimum current in shunt mode and regulates up to 10mA, enabling drop-in replacement of discrete Zeners in legacy designs without circuit modification.

What is the minimum input voltage required for LH0070-1H to regulate at full load?

LH0070-1H requires a minimum input voltage of 11.4V when sourcing up to 1mA, per the LH0070 Electrical Characteristics table. At higher loads (e.g., 10mA), the minimum VIN increases slightly due to internal dropout - the guaranteed curve shows ≥11.6V at 5mA. This 11.4V threshold ensures reliable start-up and regulation in battery-backed systems using 12V nominal supplies with aging or cold-temperature derating.

How does LH0070-1H achieve its ultralow 6µV_P-P noise performance?

LH0070-1H achieves 6µV_P-P (0.1Hz–10Hz) noise through a subsurface buried Zener diode structure that eliminates surface-state noise mechanisms inherent in bandgap or surface-Zener references. This design, combined with proprietary low-noise biasing and thermal isolation in the TO-39 metal can, reduces flicker noise to <0.5ppm of 10V output. Airflow shielding (e.g., foam cup) is recommended to prevent thermoelectric noise from kovar leads - a documented requirement in the LH0070-1H application notes.

Is LH0070-1H pin-compatible with AD581 and LT1031 devices?

Yes, LH0070-1H is pin-compatible with both AD581 and LT1031 series devices in the H-package TO-39 outline, sharing identical 3-pin configuration (Input, Output, Ground). The cross-reference guide confirms LH0070-1H matches AD581K electrical specs and exceeds them in noise, hysteresis, and long-term stability. No PCB changes are needed when substituting LH0070-1H for AD581K or LT1031CCH in existing designs.