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H
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Henry(ries): The unit of inductance. |
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H-Bridge
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A circuit diagram which resembles the letter "H." The load is the horizontal line, connected between two pairs of intersecting lines. It is very common in DC motor-drive applications where switches are used in the "vertical" branches of the "H" to control the direction of current flow, and thus the rotational direction of the motor. |
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Half-Duplex
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Data transmission over a circuit capable of transmitting in either direction, but not simultaneously. |
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Half-Flash
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An ADC architecture which uses a bank of comparators first to digitize the upper half bits, then uses a digital-to-analog converter (DAC) to subtract that voltage from the input, and then digitizes what remains of the input signal to get the lower half bits. See also: "The ABCs of ADCs," www.maxim-ic.com/an748 |
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Handover
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Switching an on-going call to a different channel or cell in a wireless cellular network. Also known as "handoff." |
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Harmonic Distortion
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The presence of frequencies in the output of a device that are not present in the input signal, and are multiples of components of the input signal. Clipping is a common cause but other nonlinearities can also introduce harmonics. |
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HAST
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Highly accelerated stress test; highly accelerated steam and temperature |
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HB LED
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High-Brightness LEDs are any of a new generation of LEDs bright enough for illumination applications such as automotive interior, exterior, and display; room and architectural illumination; task and general lighting; projection display; display backlights; and signage.
See: High-Brightness LED Drivers and Solutions |
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HBT
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Heterojunction bipolar transistor |
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HD
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Harmonic distortion |
| HD2 |
See Second Harmonic Distortion
|
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HDLC
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High Level Data Link Control: An ITU-TSS link layer protocol standard for point-to-point and multi-point communications. |
| HDLC Controller |
See HDLC
|
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HDSL
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High bit-rate Digital Subscriber Line: The oldest of the DSL technologies, it continues to be used by telephone companies deploying T1 lines at 1.5Mbps and requires two twisted pairs. |
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HDTV
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High-definition television: An all-digital system for transmitting a TV signal with far greater resolution than the analog standards (PAL, NTSC, and SECAM). A high-definition television set can display several resolutions, (up to two million pixels versus a common television set's 360,000). HDTV offers other advantages such as greatly improved color encoding and the loss-free reproduction inherent in digital technologies. |
| Heat Sink |
See Integrated Heat Spreader
|
| Heating-Ventilation-Air Conditioning |
See HVAC
|
| heatsink |
See Heat Sink
|
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HEMT
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High-electron-mobility transistor |
| Hertz |
See Hz
|
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HF
|
High frequency |
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HGLL
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High gain, low linearity |
| hi-Z |
See Tri-State
|
| High Bit-Rate Digital Subscriber Line |
See HDSL
|
| High-Brightness LED |
See HB LED
|
| High-Definition Television |
See HDTV
|
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High-Side
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An element connected between the supply and the load. High-side current sensing applications measure current by looking at the voltage drop across a resistor placed between the supply and the load. |
| High-Speed Downlink Packet Access |
See HSDPA
|
| High-Speed Packet Access |
See HSPA
|
| High-Speed Serial Interface |
See HSSI
|
| High-Speed Uplink Packet Access |
See HSUPA
|
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Home RF
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Trademarked name for Home Radio Frequency, a networking technology which uses antennae and transmitters to provide wireless home networking via transmitted radio signals. |
| Home-Rf |
See Home RF
|
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HomePlug
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HomePlug (PowerLine) is an industry-standard method for transmitting data via the power lines. It can transmit audio, video, control signals, etc. HomePlug is a trademark of the HomePlug Powerline Alliance; Powerline is the generic term for the method.
See our PowerLine product page.
PLC is an acronym for Powerline Communications. |
| HomeRF |
See Home RF
|
| hot carrier diode |
See Schottky Diode
|
| Hot-Swap |
See Hot-Swap
|
| HotSwap |
See Hot-Swap
|
| HP-IB |
See GPIB
|
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HR
|
High reliability |
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HSDPA
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High-Speed Downlink Packet Access (HSDPA) is a 3G radio interface standard in the HSPA family for wireless and cellular handsets or datacards that increase the datarate and improve the traffic handling of existing UMTS standards. |
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HSPA
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High-Speed Packet Access (HSPA) is a collection of radio interface standards for wireless and cellular handsets or datacards that increase the datarate and improve the traffic handling of existing UMTS standards. |
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HSSI
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High-Speed Serial Interface: A short-distance communications standard for data rates from 2Mbps to 52Mbps. |
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HSUPA
|
High-Speed Uplink Packet Access (HSUPA) is a 3G radio interface standard in the HSPA family for wireless and cellular handsets or datacards that increase the datarate and improve the traffic handling of existing UMTS standards. |
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HTML
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Hyper Text Markup Language: Coding language used to create web pages. |
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HTS
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High-temperature semiconductor |
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HTTP
|
Hyper Text Transport/transfer Protocol |
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Human Body Model
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An ESD test method where the ESD generator consists of a 100pF capacitor and a 1.5kohm series resistor.
See the following application notes that describe how ESD is generated, how it damages electronic systems, human body and machine models for testing, IEC compliance levels, and design approaches.
|
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HVAC
|
Heating, Ventilation, and Air Conditioning: Industry term for the systems and technology responsible for the heating, ventilation, and air conditioning in buildings. HVAC systems regulate comfort (temperature and humidity), energy efficiency, and air quality.
See: Maxim Solutions for HVAC designers. |
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Hz
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Hertz: A measure of frequency. An older term is cycles per second, or cps. |
EE-Glossary Term of the Day