Semi-conducteurs discrets
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Produits (1697)
0402ESDA-05N - 5V Bidirectional Polymer ESD Suppressor | BORN
The BORN 0402ESDA-05N is a bidirectional polymer ESD suppressor with a 5V working voltage, 50V clamp-side breakdown capability, ultra-low 1.5 pF line capacitance, and 1 nA leakage current, housed in a 2-terminal 0402 (1005 metric) surface-mount package. It is qualified to suppress electrostatic discharge events per IEC 61000-4-2 and operates over a -40C to +85C industrial temperature range. A polymer ESD suppressor is a type of transient voltage suppression device within the broader family of TVS diodes and circuit protection components. Unlike silicon avalanche TVS diodes, polymer suppressors use a conductive polymer material that switches from a high-impedance state to a low-impedance state within nanoseconds when an ESD transient exceeds its trigger threshold, shunting the surge energy away from the protected IC. This technology enables extremely low parasitic capacitance, which is the defining parameter for high-speed data line protection. Key features of the 0402ESDA-05N include its 1.5 pF typical capacitance, which minimizes signal insertion loss on USB 2.0, HDMI, and other multi-gigabit interfaces; its bidirectional 5V standoff rating suited to both single-ended and symmetric data lines; and its nanosecond response time to IEC 61000-4-2 contact and air discharges. The 1 nA reverse leakage keeps standby power consumption negligible in battery-powered designs. The polymer construction provides no DC clamping action under normal operating conditions, so the line sees essentially the suppressor capacitance only. During an ESD event, the device transitions to a conductive state and recovers automatically after the transient passes, requiring no replacement or reset. The compact 0402 footprint allows placement directly adjacent to the connector pins. Typical applications include high-speed data port protection on smartphones, tablets, and set-top boxes; ESD protection for USB, HDMI, and antenna lines in consumer electronics; and protection of sensitive RF front-ends where capacitance must stay below 2 pF. Design tip: place the suppressor as close to the connector as possible with minimal stub length, following the zero-stub pad guidance common to polymer ESD devices, so the transient is clamped before it propagates down the trace. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
1.5KE11CA - 1500W Bidirectional TVS, 9.4V VRWM | Littelfuse
The Littelfuse 1.5KE11CA is a 1500W bidirectional axial-leaded Transient Voltage Suppressor (TVS) diode designed to clamp voltage transients induced by lightning, inductive load switching, and ESD events on sensitive electronic equipment. According to the Littelfuse datasheet, it features a Reverse Working Standoff Voltage (VRWM) of 9.4V, a Breakdown Voltage range of 10.5V to 11.6V, a maximum clamping voltage of 15.6V at 97.4A peak pulse current, and is housed in a DO-201 through-hole axial package. A TVS diode is a solid-state avalanche device engineered to shunt large transient currents away from downstream circuitry in microseconds, providing far faster response than MOVs or PTC fuses. TVS diodes sit at the bottom of the protection hierarchy as discrete semiconductors, fall under the surge-protector family, and serve as the first-line defense on DC power rails, signal lines, and automotive bus networks where predictable clamping behavior is mandatory. Key differentiating specifications include 1500W peak pulse power dissipation at a 10/1000 microsecond waveform, a peak pulse current (IPPM) of 97.4A, glass-passivated chip junction construction for long-term reliability, low Zener impedance, and a maximum clamping voltage of 15.6V that keeps downstream 12V logic rails well within their absolute-maximum ratings during surge events. The bidirectional (CA suffix) variant conducts transients of either polarity, eliminating orientation errors during PCB assembly. Architecturally, the 1.5KE11CA is a silicon PN-junction avalanche suppressor with a glass-passivated surface that suppresses leakage and stabilizes breakdown characteristics across the -55C to +175C operating range. The avalanche breakdown mechanism provides sub-microsecond response, ensuring that fast-rise transients such as those defined by IEC 61000-4-2 are clamped before sensitive ICs see the overvoltage. Typical applications include 12V automotive load-dump protection per ISO 7637-2, industrial PLC 24V rail transient suppression, telecom -48V battery backplane protection, USB and HDMI port ESD/lightning protection on consumer devices, and protection of SMPS auxiliary windings from flyback spikes. The wide standoff-voltage range and 1500W rating also suit PoE PSE input protection. When designing with this part, derate surge power for temperatures above 75C using the derating curve in the datasheet, ensure lead bend radius exceeds 1.5mm to avoid axial-package cracking, and place the TVS within 50mm of the protected connector for maximum effectiveness. For multi-stage protection, pair the 1.5KE11CA with an upstream GDT or PTC to coordinate energy dissipation. This page synthesizes current distributor pricing, drop-in cross-brand equivalents, parametric comparison tables, and practical design notes not found in the manufacturer datasheet alone - giving the engineer a one-stop reference for sourcing and qualifying the 1.5KE11CA in new or existing designs.
1.5KE11CA-B - 1500W Bi-Directional TVS Diode 9.4V | Littelfuse
The Littelfuse 1.5KE11CA-B is a 1500 W axial-leaded bidirectional Transient Voltage Suppressor (TVS) diode rated at 9.4 V working standoff voltage (VRWM), 10.5 V minimum breakdown voltage, and 15.6 V maximum clamping voltage at 97.4 A peak pulse current, housed in a DO-201 (DO-27) through-hole axial package. It is designed to clamp fast transient overvoltages such as those induced by lightning, inductive load switching, and ESD, protecting downstream sensitive electronics. A TVS diode (Transient Voltage Suppressor) is a semiconductor protection device belonging to the surge protector / discrete semiconductor family. Under normal operation it presents a high-impedance path; when a transient exceeds its breakdown voltage, it avalanches into a low-impedance state within picoseconds, shunting surge energy away from protected circuits. TVS diodes sit hierarchically under discrete semiconductors -> diodes -> surge protectors, and are commonly used alongside MOVs, gas discharge tubes, and PTC resettable fuses in multi-stage protection networks. The bidirectional ('CA') construction means a single device clamps both positive and negative transients, making it ideal for AC lines and differential signal interfaces. Key specifications include 1500 W peak pulse power (10/1000 µs waveform), 97.4 A peak pulse current (IPP), <1 ps typical response time, low clamping factor (15.6 V VC / 9.4 V VRWM = 1.66), and an operating temperature range that supports industrial environments. The 5 % voltage tolerance ('A' suffix) and bidirectional polarity ('C') make the 1.5KE11CA-B particularly suited for protecting 12 V system rails, RS-485 interfaces, and telecom line cards where induced surges from outdoor cabling are common. The 1.5KE11CA-B uses a silicon PN-junction avalanche structure manufactured in a glass-passivated die, packaged in a transfer-molded DO-201 body with tin-plated axial leads for wave or hand soldering. Its robust construction supports IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity testing when properly designed into the protection network. Typical applications include 12 V automotive load-dump suppression, telecommunications line-card secondary protection, industrial 24 V PLC and sensor protection, and consumer electronics AC/DC adapter input protection. Designers should place the TVS as close to the connector or transient entry point as possible, with short, wide PCB traces to minimize parasitic inductance. Design tip: combine the 1.5KE11CA-B with a PTC resettable fuse or series resistor upstream to limit sustained fault current and extend device lifetime under repeated surge events. This page synthesizes distributor pricing, drop-in equivalents from multiple brands, and practical protection-design guidance not consolidated on any single manufacturer page.
1.5KE16ARL4G - 1500W 16V Unidirectional TVS | onsemi
The onsemi 1.5KE16ARL4G is a 1500 W axial-leaded unidirectional Transient Voltage Suppressor (TVS) diode in the Surmetic DO-201AA package, designed to clamp high-energy transients and protect voltage-sensitive downstream components. The part delivers a working standoff of 13.6 V, a minimum breakdown of 15.2 V, and a maximum clamping voltage of 22.5 V at the rated 67 A peak pulse current (Ipp) per the 10/1000 µs waveform. A Transient Voltage Suppressor (TVS) is a specialized clamping diode that operates in avalanche breakdown when the line experiences a fast over-voltage event such as an ESD pulse, inductive load kickback, or lightning-induced surge. TVS diodes sit at the front of the protection topology, upstream of bulk protection (fuses, PTCs) and downstream of the exposed connector; their job is to divert surge current away from sensitive ICs within microseconds. The 1.5KE family is the workhorse 1500 W industrial/automotive grade series defined by JEDEC register DO-201AA axial outlines. Key features of the 1.5KE16ARL4G include 1500 W peak pulse power (10/1000 µs waveform), 67 A peak pulse current (Ipp), unidirectional polarity, a typical clamping voltage of 22.5 V at Ipp, low Zener impedance in breakdown, fast response time (sub-nanosecond), and a maximum clamping factor that ensures the protected downstream rail stays within its absolute-maximum rating. The Surmetic axial package is a through-hole DO-201AA body with robust leads suitable for wave-soldering and high-vibration environments. Technically, the 1.5KE16ARL4G uses a large-junction silicon die designed for non-repetitive high-energy avalanche. Peak pulse power is specified for a 10/1000 µs exponential waveform per the industry-standard TVS test method; steady-state power dissipation is rated at 5 W (with appropriate lead length derating). Reverse leakage at standoff is in the µA range, allowing the part to remain in-circuit without measurable quiescent loss. Typical applications include DC power-line protection on 12 V industrial bus rails, automotive 12 V load-dump protection, secondary protection behind a primary TVS or PTC on long signal lines, protection of telecom line drivers, and suppression of inductive kickback from relays, solenoids, and motor windings. It is also widely used in switch-mode power supply (SMPS) output rectification and snubbing. When designing with this part, derate peak pulse power for shorter pulses (the 8/20 µs waveform allows higher Ipp) and ensure lead length matches the datasheet's thermal derating curve. Avoid continuous operation in breakdown - this part is intended for transient clamping only, not as a voltage regulator.
1.5KE18AG - 18V 1500W Unidirectional TVS | onsemi
The onsemi 1.5KE18AG is a 1500 W unidirectional Mosorb Zener Transient Voltage Suppressor (TVS) in an axial-leaded through-hole package, designed to protect voltage-sensitive components from high-voltage, high-energy transients. The "1.5KE" series defines a family of glass-passivated-junction transient voltage suppressors widely used as circuit-protection devices. A TVS diode is a solid-state silicon device that clamps an overvoltage event by avalanche breakdown, shunting transient energy away from downstream circuitry. Within the broader protection hierarchy, TVS diodes sit alongside metal-oxide varistors (MOVs) and gas discharge tubes as fast-response (< 1 ns) suppressors, prized over fuses because they self-recover after the transient has decayed. Key features of the 1.5KE18AG include a working standoff voltage of 15.3 V, a maximum clamping voltage of 25.2 V at 59.5 A peak pulse current, and a peak pulse power rating of 1500 W for an 8/20 us waveform (per IEC 61000-4-5). The device offers unidirectional polarity, a glass-passivated die for stability, and a Surmetic axial package with operating junction temperature up to 175 C. The 1.5KE18AG uses an avalanche-mode silicon-junction Zener die, where the junction is glass-passivated for long-term stability and moisture resistance. Its low Zener impedance and fast response time allow it to clamp transient events from ESD, inductive load kickback, and lightning-induced surges within nanoseconds. Typical applications include protection of 12 V and 15 V dc power rails, automotive ECU inputs, industrial PLC I/O lines, telecom -48 V system protection, and USB/HDMI interface guarding on consumer equipment. When selecting layout, mount the 1.5KE18AG as close as possible to the protected connector or IC pin and minimize lead length to reduce parasitic inductance, which otherwise degrades clamping effectiveness at high dv/dt. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single anchor for board-level protection decisions.
1.5SMC8.2A-E3/9AT - 1500W 8.2V Uni-Dir TVS | Vishay
The Vishay 1.5SMC8.2A-E3/9AT is a 1500W peak-pulse-power unidirectional TRANSZORB transient voltage suppressor (TVS) diode rated at a 8.2V working standoff voltage, packaged in the industry-standard DO-214AB (SMCJ) surface-mount outline. It is engineered to clamp 12.1V at a peak pulse current of 124A (10/1000 µs waveform) and protect downstream electronics from induced lightning, load-dump, and ESD transients on DC rails. A TVS diode (Transient Voltage Suppressor) is a clamping semiconductor that operates in avalanche breakdown when the voltage across it exceeds a defined threshold. It belongs to the protective-component hierarchy: TVS diode → ESD/surge protector → discrete semiconductor → circuit protection device. Under normal operation the part presents a high-impedance path; when a transient pushes the line above its breakdown voltage (8.2V nominal / 7.02V reverse standoff), it conducts in nanoseconds and shunts the surge energy to ground, holding the protected rail to a safe clamping voltage. Key specifications include a 1500W peak pulse power dissipation on a 10/1000 µs waveform, 124A peak pulse current (Ipp), 12.1V maximum clamping voltage at Ipp, and a glass-passivated chip junction that improves long-term reliability under repetitive surge events. The TRANSZORB series uses a low-profile DO-214AB package suitable for automated placement and offers uni-directional (suffix A) polarity. Architecturally, the device is a silicon avalanche junction that has been glass-passivivated for environmental stability and given a low-inductance, large-area die bond to handle the 1500W transient. The flip-chip-style construction minimizes lead inductance so the clamping response remains sub-nanosecond, preserving the protected IC's input stage during fast-edge ESD events. Typical applications include 12V automotive load-dump protection, industrial 24V bus transient suppression, USB Type-C VBUS line protection, and telecom port protection against secondary lightning surges. Any low-voltage DC rail driving sensitive CMOS logic, microcontrollers, or RF transceivers in harsh EMI environments can leverage this part. When designing with this device, observe the derating curve over temperature - peak pulse power falls linearly from 1500W at 25°C toward zero at the maximum TJ. Place the TVS as close as possible to the connector entry point and keep the trace to ground short and wide to minimize parasitic inductance that would otherwise let voltage overshoot above the 12.1V clamp rating. This page synthesizes distributor pricing, parametric drop-in alternatives sourced from cross-reference tools, and applied design guidance beyond what is published in the manufacturer's datasheet alone.
1.5SMCJ54C - 1500W TVS Diode 54V Bidirectional SMC | Diotec
The Diotec 1.5SMCJ54C is a 1500 W peak-pulse surface-mount transient voltage suppressor (TVS) diode in a bidirectional configuration with a stand-off working voltage of 54 V, housed in a DO-214AB (SMC) plastic package. It is engineered to clamp fast transient events such as ESD, EFT, and lightning-induced surges on 48 V telecom, industrial-bus, and DC power-distribution lines, providing a maximum clamping voltage of approximately 87.1 V at the rated 1500 W peak pulse power (10/1000 µs waveform). What is a TVS diode? A transient voltage suppressor is a discrete semiconductor protection device that responds to over-voltage events in the nanosecond time domain by avalanching into a low-impedance state, shunting surge current away from sensitive downstream circuitry. TVS diodes sit within the broader hierarchy of discrete semiconductors (diodes -> protection devices -> TVS) and are commonly specified alongside metal-oxide varistors (MOVs) and gas discharge tubes (GDTs) as a second-tier clamp after primary over-current protection. The "C" suffix indicates bidirectional operation, meaning a single part protects both polarities of an AC or DC-coupled bus without orientation sensitivity. Key features include a minimum breakdown voltage of 60.0 V and a maximum breakdown of 66.0 V at 1 mA, a maximum reverse leakage of 5 µA at the rated stand-off, a peak forward surge rating suited for the SMC footprint, and a glass-passivated junction rated for 150 °C junction temperature. The low-profile DO-214AB (SMC) body has Underwriters Laboratory Flammability Classification 94V-0 and supports 260 °C / 10 s high-temperature soldering for lead-free reflow compatibility. Typical applications include 48 V PoE protection, telecom line-card secondary protection, industrial 24/48 V DC bus transient suppression, photovoltaic inverter input clamping, and DC motor drive H-bridge protection. Designers also use 1.5SMCJ54C series parts as secondary protection after a primary GDT or PTC to limit let-through energy. When designing with this device, verify that the chosen working voltage (Vrwm = 54 V) sits above the maximum continuous operating voltage of the protected bus, and confirm that the peak-pulse power derating curve at the expected surge duration does not exceed 1500 W. Bidirectional parts require no orientation marking, simplifying PCB layout and rework.
10MQ060NTRPBF - 60V 1A Schottky Rectifier SMA | Vishay
The Vishay 10MQ060NTRPBF is a 60 V, 1 A surface-mount Schottky rectifier supplied in the DO-214AC (SMA) package, originally introduced by International Rectifier and now part of the Vishay Schottky portfolio. It is designed for applications requiring a low forward voltage drop and a small PCB footprint, with a typical forward voltage of 620 mV at 2.1 A and a maximum average rectified forward current of 1 A (or 1.5 A per the Mouser listing, depending on mounting and thermal conditions). A Schottky rectifier is a semiconductor diode that uses a metal-semiconductor junction instead of a p-n junction, producing a lower forward voltage drop and essentially zero reverse recovery time. This makes Schottky diodes ideal for high-frequency switching power conversion, where rectifier losses dominate efficiency. Within the discrete semiconductor hierarchy, the 10MQ060NTRPBF belongs to the Schottky rectifier family, which sits under rectifier diodes, then discrete semiconductors. The PBF suffix indicates a lead-free, RoHS-compliant matte-tin-plated terminal finish compatible with lead-free reflow profiles. Key features include a peak repetitive reverse voltage (VRRM) of 60 V, an average rectified forward current of 1 A, low forward voltage drop of 620 mV typical at 2.1 A, and a guard-ring structure for enhanced ruggedness and long-term reliability. The device also meets MSL level 1 per J-STD-020, is halogen-free according to IEC 61249-2-21, and is supplied on 7-inch tape-and-reel with 7,500-piece reels, enabling high-volume automated assembly. The 10MQ060NTRPBF uses a single-junction Schottky die in a DO-214AC (SMA) outline, the industry-standard footprint for 1 A surface-mount rectifiers. Its guard ring suppresses edge breakdown under reverse-bias stress, improving avalanche robustness. The lack of reverse recovery charge makes it suitable for continuous-conduction-mode boost and buck converters operating in the hundreds of kHz. Typical applications include disk drive power conditioning, switching power supply output rectifiers, DC-DC converters, freewheeling diodes across inductive loads, battery charging rectifiers, and reverse-battery protection circuits. Designers favor this part where efficiency and small PCB area are critical. When designing with the 10MQ060NTRPBF, ensure the PCB land pattern follows the SMA (DO-214AC) recommendation with adequate thermal copper to keep the junction below 150 C at full load. Verify that peak inverse voltage never exceeds 60 V, including transient ringing from the input source. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the standalone manufacturer datasheet.
1N4148W-TP - 100V 150mA High-Speed Switching Diode | MCC
The Micro Commercial Components (MCC) 1N4148W-TP is a high-speed small-signal switching diode rated for 100 V repetitive peak reverse voltage and 150 mA average forward current, housed in a surface-mount SOD-123 package. Its headline ratings are 100 V Vrrm, 150 mA If(AV), and a 4 ns reverse recovery time, making it a flagship variant of the industry-standard 1N4148 family. A small-signal switching diode is a two-terminal semiconductor device designed for fast turn-on/turn-off behavior rather than power rectification. The 1N4148W-TP belongs to the well-known 1N4148 family of silicon epitaxial planar diodes, which sit in the hierarchy: switching diode -> small-signal diode -> rectifier diode -> discrete semiconductor. Their defining trait is a sub-5 ns reverse recovery time, enabling use in high-frequency signal paths and logic-level clamping where standard rectifiers would be too slow. Key features include a forward voltage of 1.25 V maximum at the rated current, a non-repetitive peak forward surge current (Ifsm) of 4.0 A for 8.3 ms half-sine pulses, and a low capacitance of approximately 1.5 pF at 0 V. The diode is rated for a power dissipation of 400 mW on the standard FR-4 test board and 100 mW continuous die-off. The molded SOD-123 plastic package is RoHS-compliant, lead-free, and suitable for automated pick-and-place assembly, with a thermal resistance of approximately 357 C/W junction-to-ambient on the manufacturer test board. The 1N4148W-TP is widely used as a logic-level clamp, freewheeling diode, signal rectifier, and polarity protection element in consumer, industrial, and communication electronics. Its 4 ns switching speed lets it operate cleanly in circuits up to several hundred megahertz, while the 100 V reverse rating provides ample headroom for 5 V, 12 V, and 24 V rails, as well as analog signal lines up to tens of volts. Typical applications include high-frequency rectifiers in switch-mode power supplies, freewheeling protection for small relays and solenoids, polarity protection on USB and battery inputs, and general signal switching in MCU and logic-level circuits. Designers should observe the 150 mA continuous current rating and 4.0 A surge rating, and note that SOD-123 thermal dissipation is modest - keep trace copper pours generous to avoid thermal runaway in continuous operation. This page synthesizes distributor pricing, drop-in cross-brand equivalents, and selection notes not aggregated in the standalone MCC datasheet PDF.
1N4148W-TP-HF - 100V 150mA Fast Switching Diode SOD-123 | MCC
The Micro Commercial Components (MCC) 1N4148W-TP-HF is a high-speed small-signal switching diode rated at 100 V reverse voltage (Vrrm) and 150 mA average forward current, packaged in a compact surface-mount SOD-123 outline. It delivers a fast reverse recovery time of 4 ns and a low forward voltage of 1.25 V maximum at rated current, making it well suited for high-frequency rectification, logic-level clamping, and signal routing in dense PCB layouts. A small-signal switching diode is a two-terminal semiconductor device optimized for rapid transition between conducting and blocking states. The category sits within the broader hierarchy of discrete semiconductors -> diodes -> rectifier/switching diodes. Unlike power rectifiers, small-signal switching diodes trade current handling for ultra-fast switching, low junction capacitance, and sub-nanosecond recovery, making them the workhorse of analog signal processing, digital logic interfaces, and protection networks. Key specifications include a repetitive peak reverse voltage (Vrrm) of 100 V, an average rectified forward current (If(AV)) of 150 mA, a non-repetitive peak forward surge current (Ifsm) of 4.0 A for an 8.3 ms half-sine pulse, and a total power dissipation of 400 mW. The diode exhibits a typical junction capacitance of 4.0 pF at 0 V and a maximum reverse leakage current of 1.0 µA at 75 V, ensuring minimal loading in high-impedance circuits and clean switching behavior in pulse and clamp topologies. Architecturally, the 1N4148W-TP-HF uses a planar silicon epitaxial junction construction. The "HF" suffix denotes a Halogen-Free finish, supporting lead-free reflow profiles and RoHS-compliant assembly. The SOD-123 package provides a low thermal resistance footprint suitable for handheld, USB-powered, and IoT-class designs where every square millimeter of board real estate matters. Typical applications include high-speed switching circuits, logic gate steering, analog signal clamping, freewheeling protection for small inductors, and reverse-polarity protection on low-current rails. It is also commonly used in voltage doublers, ring modulators, sample-and-hold circuits, and as a general-purpose flyback diode. When designing with the 1N4148W-TP-HF, observe the 400 mW power dissipation limit. For continuous 150 mA conduction at 1 V forward drop, derate linearly above 25 °C ambient. Use a 0603 or larger copper pad to spread heat. Verify that pulse operation stays within the Ifsm rating of 4.0 A for transient surges.
1N4148WT-7 - 80V 125mA Fast Switching Diode SOD-523 | Diodes Inc
The Diodes Incorporated 1N4148WT-7 is a surface-mount fast switching diode rated 80 V reverse voltage and 125 mA average forward current, housed in an ultra-compact SOD-523 package. It features a 4 ns reverse recovery time, 1.25 V maximum forward drop at 150 mA, and a 2 A peak forward surge current rating, making it one of the most widely specified signal-level switching diodes for modern high-density PCB designs. A switching diode is a two-terminal semiconductor device optimized to transition between conducting and blocking states with minimal storage delay. Within the broader discrete semiconductor hierarchy, switching diodes sit beneath small-signal diodes and above general-purpose rectifiers in speed class. The 1N4148 family has served as the de facto industry baseline for high-speed signal routing since the 1970s, and the WT suffix specifically maps the legacy DO-35 glass-axial 1N4148 onto the SOD-523 footprint for SMT reflow assembly. Key features include a peak repetitive reverse voltage of 100 V (Vrrm), 75 Vrms working reverse voltage, 53 V DC blocking voltage, and a power dissipation of 150 mW on the standard FR-4 test board. The device is fully RoHS compliant, lead-free, and qualified to JEDEC JESD51 thermal test conditions. Its low junction capacitance (typically 4 pF at 0 V) preserves signal integrity in high-speed logic interfaces. The 1N4148WT-7 employs a planar passivated silicon epitaxial junction, optimized for sub-5 ns switching. The glass-passivated die is bonded inside the SOD-523 molded plastic package with a matte tin finish that supports lead-free reflow profiles up to 260 C per JEDEC J-STD-020. Typical applications include high-speed logic clamping, line termination, signal steering in multiplexers, freewheeling protection for small inductors, and reverse-polarity protection on low-current rails. The SOD-523 footprint saves 60% board area versus the legacy DO-35 1N4148, allowing direct migration in portable and IoT designs where every square millimeter counts. When designing with this part, observe the 4 ns reverse recovery budget and stay below the 150 mA continuous forward rating. For higher currents use a Schottky diode, and for high-voltage isolation use a TVS or rectifier such as the 1N400x family. This page synthesizes distributor pricing, drop-in alternatives, and practical PCB layout guidance not found in the manufacturer datasheet alone.
1N4148WT-7-F - 100V 150mA Fast Switching Diode SOD-523 | Diodes Inc
The Diodes Incorporated 1N4148WT-7-F is a surface-mount fast switching diode rated at 100V reverse voltage and 150mA average forward current, housed in an ultra-compact SOD-523 package. It delivers 4ns reverse recovery time, 1.25V maximum forward voltage at the rated current, and 2A peak forward surge capability, making it one of the most widely deployed small-signal switching diodes in modern electronics. The 7-inch reel F-suffix indicates Pb-free, fully RoHS-compliant matte-tin plating suitable for high-volume automated assembly. A small-signal switching diode is a two-terminal semiconductor device optimized for fast transitions between conducting and blocking states at low currents (typically under 500mA). Unlike power rectifiers designed for high-current 50/60Hz rectification, switching diodes prioritize reverse recovery time (trr), junction capacitance, and leakage current. They sit within the broader hierarchy: diode -> semiconductor -> discrete component -> electronic part, and are typically used for signal routing, logic-level clamping, and high-frequency demodulation rather than power conversion. Key features include a 100V peak repetitive reverse voltage (VRRM), 125mA continuous forward current (some datasheets cite 150mA depending on mounting conditions), 250mW power dissipation, and operating junction temperature from -65C to +150C. The SOD-523 footprint occupies only 1.6mm x 0.8mm PCB area, enabling dense board layouts in portable and wearable products. Reverse leakage is specified at 25nA at 25V, providing excellent isolation when reverse-biased. The 1N4148WT-7-F uses a planar-passivated silicon epitaxial junction that achieves sub-5ns reverse recovery. Compared to the industry-standard 1N4148 in a glass DO-35 package, the 1N4148WT-7-F offers equivalent electrical behavior at high frequency with a footprint roughly 10x smaller, which is why it has become the default small-signal switching diode in surface-mount designs. Typical applications include high-speed switching in digital logic circuits, signal demodulation in AM/FM receivers, reverse-polarity protection in low-current paths, clamping in protection circuits, ring modulation in audio, and general-purpose rectification below 200mA. It is also widely used in high-density consumer electronics where the 1N4148's TO-92/DO-35 footprint is too large. When designing with this device, observe the 100V maximum repetitive reverse voltage and ensure peak inverse voltage in the application remains below this rating. The SOD-523 thermal resistance (junction-to-ambient) is approximately 540 C/W, limiting practical continuous dissipation to under 250mW without aggressive copper thermal relief. Always place reverse-bias protection where inductive kickback could exceed the 100V rating. This page synthesizes distributor pricing, drop-in alternatives from Diodes Incorporated and competitors, and practical design notes not found in the manufacturer datasheet.
1N4744A - 15V 1W Zener Diode DO-41 ±5% | onsemi
The onsemi 1N4744A is a 15 V, 1 W hermetically sealed glass Zener voltage-regulator diode in an axial-lead DO-41 (SOD66) through-hole package. It offers a nominal Zener voltage of 15 V at 17 mA test current with a ±5% voltage tolerance, a maximum Zener impedance of 14 Ω at 17 mA, and a maximum forward voltage of 1.2 V at 200 mA. The series consists of 22 nominal voltages spanning 3.3 V to 24 V in the same package, allowing design reuse across an entire low-voltage regulation family. A Zener diode is a specialized pn-junction silicon device engineered to operate in the reverse-breakdown region, where the voltage across the diode remains essentially constant over a wide range of reverse currents. In the broader component taxonomy, the 1N4744A belongs to voltage regulator diodes (also called Zener diodes or voltage-reference diodes), which are a subset of discrete semiconductors used for voltage clamping, reference generation, and shunt regulation. Compared to shunt regulator ICs or series linear regulators, Zener diodes offer a simpler, lower-cost solution for low-current, moderate-precision applications. Key features of the 1N4744A include very sharp reverse breakdown characteristics, low reverse leakage current, a maximum power dissipation of 1 W at 25 °C ambient (derated linearly to 0 W at 175 °C), and an operating and storage temperature range of −65 °C to +175 °C. The hermetically sealed glass DO-41 package provides excellent long-term stability and is suitable for harsh-environment and through-hole industrial designs where SMT components are not appropriate. Typical applications include low-voltage shunt regulators, voltage references for analog circuits, overvoltage protection clamps, meter protection in analog instruments, and bias supplies for transistor and op-amp circuits. The 15 V nominal voltage makes it especially useful for generating stable references in 12 V nominal systems where some headroom above the rail is required. When designing with the 1N4744A, ensure the Zener test-current bias (17 mA nominal) is supplied and that the series resistor limits total power dissipation to within the 1 W rating. Thermal management is critical because power dissipation rises quickly when the diode clamps transients. Mounting orientation and lead length both affect thermal resistance to ambient; keep lead lengths short and consider clip-on heatsinks for continuous high-power operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selecting the 1N4744A across industrial, automotive, and instrumentation applications.
1N4744A-T50A - 15V 1W Zener Diode DO-41 | Single Zener
The onsemi 1N4744A-T50A is a 15 V nominal, 1 W Zener voltage-regulator diode housed in an axial-lead hermetically sealed DO-41 (SOD66) glass package. It offers ±5% voltage tolerance, 14 Ω maximum Zener impedance at 17 mA, and a low 1.2 V maximum forward voltage at 200 mA, making it well suited to general-purpose voltage reference and clamping roles in through-hole designs. A Zener diode is a specialized pn-junction diode engineered to operate in the reverse-breakdown (Zener) region, where the voltage across the device remains nearly constant over a wide range of reverse current. This makes Zener diodes the building blocks of shunt voltage regulators, precision references, and overvoltage protection clamps. Within the discrete semiconductor hierarchy, Zener diodes belong to the diodes family, sit alongside TVS diodes, Schottky diodes, and rectifier diodes, and form the simplest, lowest-noise class of reference voltage source used in analog and power-conversion circuits. Key features include a nominal working voltage of 15 V at a test current of 17 mA, ±5% voltage tolerance for the A-suffix series, 1 W maximum DC power dissipation at TL = 50 °C with 3/8 inch lead length (derated above 50 °C), and a broad -65 °C to +175 °C operating and storage temperature range. The silicon-oxide passivated junction delivers stable long-term voltage characteristics under continuous bias. The -T50A suffix denotes an ammo-pack tape-and-axial reel configuration, optimized for automatic through-hole insertion. The 1N4744A-T50A utilizes a hermetically sealed glass envelope (DO-41 / SOD66) that protects the silicon die against humidity and mechanical stress, while the axial leads simplify PCB layout and heatsinking through copper trace area on each pad. Compared to surface-mount equivalents, the DO-41 package delivers higher intrinsic power dissipation per unit and easier prototyping on perfboard and breadboards. Typical applications include 15 V shunt voltage regulators in analog signal-conditioning circuits, overvoltage protection clamps on sensor and signal lines, reference voltage sources for ADCs, bias supplies for transistor and op-amp stages, and DC voltage step-down from higher rails. It is also widely used as a precision clamp for PCBs and as a reference for low-power instrumentation. When designing with this part, observe the 1 W power derating curve above 50 °C lead temperature, keep lead length short to maximize heat conduction into the PCB, and provide adequate copper pad area on both anode and cathode sides to sustain continuous dissipation. For tighter tolerance or surface-mount requirements, consider 1N4744A in SMA/SMB equivalents. This page consolidates distributor pricing, drop-in alternative MPNs, and practical design notes that extend beyond the manufacturer datasheet for the 1N4744A-T50A.
1N5711 - 70V 15mA Schottky RF Diode DO-35 | STMicroelectronics
The STMicroelectronics 1N5711 is a small-signal silicon Schottky barrier diode rated for 70 V peak reverse voltage, 15 mA continuous forward current, and 430 mW power dissipation, packaged in a hermetic axial-lead DO-35 (DO-204AH) glass package. Its metal-to-silicon junction with a PN guard-ring structure delivers a low forward voltage of approximately 410 mV and ultrafast switching, making it a classic choice for RF detection and pulse circuitry. A Schottky diode is a semiconductor rectifier formed by a metal-semiconductor junction rather than a conventional PN junction. This construction eliminates minority-carrier storage, so switching between forward and reverse states occurs almost instantaneously, and the forward turn-on voltage is substantially lower than that of silicon PN diodes. Within the component hierarchy, the 1N5711 belongs to small-signal diodes, a subset of signal diodes within the discrete semiconductor family used for detection, mixing, gating, and clamping rather than power rectification. Key features of the 1N5711 include its high breakdown voltage for a Schottky device (70 V), achieved through a patented guard-ring design originally developed by HP/Agilent and continued by multiple manufacturers including ST and MACOM. The ultrafast switching characteristic supports UHF/VHF detection, video detection, frequency discrimination, sampling gates, and log or A-to-D conversion front ends. The glass DO-35 package provides hermetic sealing for long-term reliability and easy through-hole assembly. Technically, the guard ring raises the reverse-breakdown ceiling far above typical small-signal Schottkys while retaining picosecond-class switching. Matched batches are available from ST on request, an important option for detector applications requiring pairs with closely tracked forward characteristics. MACOM characterizes the device with 2 pF total capacitance, 1 pF junction capacitance, and 35 ohm dynamic resistance. Typical applications include high-level UHF/VHF envelope detection in receivers, low-power RF mixing and switching, pulse shaping and fast logic gating, and sample-and-hold sampling bridges in instrumentation. Design-wise, remember the 15 mA continuous current ceiling: this detector diode is not a rectifier for power supplies. Reverse leakage, typical of Schottky devices, rises sharply with temperature, so derate high-impedance detector designs at elevated ambient temperatures. This page synthesizes cross-manufacturer equivalents, drop-in alternatives, and practical design notes not consolidated in any single manufacturer datasheet.
1N5711SB - 70V 15mA Schottky Diode DO-35 | STMicroelectronics
The STMicroelectronics 1N5711SB is a small-signal Schottky barrier diode rated for 70 V reverse voltage, 15 mA average forward current, and 430 mW power dissipation, housed in a hermetic DO-35 (SOD-27) axial-lead glass package. The metal-to-silicon junction delivers a low forward turn-on voltage and ultrafast switching with negligible reverse recovery, which is exactly what UHF/VHF detection and fast pulse circuits demand. A Schottky barrier diode is a semiconductor rectifier formed by a metal-to-silicon junction rather than a conventional P-N junction. Because majority-carrier conduction dominates, the device switches extremely quickly and exhibits a lower forward voltage than an equivalent silicon P-N diode, classifying it within the broader family of small-signal diodes, rectifiers, and discrete semiconductors used across power, RF, and logic subsystems. Key features include the 70 V peak reverse voltage, ultrafast switching speed with essentially zero reverse recovery time, low turn-on voltage, and a broad dynamic range suitable for high-level signal detection. The hermetically sealed glass body provides long-term reliability in humid or otherwise harsh environments, and matched batches are available from ST on request for applications needing paired V-I characteristics. The metal-semiconductor junction is primarily optimized for high-level UHF/VHF detection and pulse applications. With low junction capacitance and fast charge extraction, the diode operates as a detector, mixer, and low-power switch well into the VHF/UHF bands, and functions in pulse shaping, sampling gates, and fast logic circuits per the MACOM and ST application descriptions. Typical applications include RF envelope detection in narrow-band receivers, UHF/VHF pulse shaping and sampling networks, low-level mixing, and general-purpose high-speed small-signal switching in instrumentation. In design, respect the 15 mA forward current and 430 mW dissipation limits; derate power above 25 C ambient and provide adequate lead length for heat conduction since the glass DO-35 package has no dedicated thermal pad. This page synthesizes distributor pricing, drop-in cross-references, and practical design notes not found in the manufacturer datasheet alone.
1N5711UR-1 - 50V 33mA Schottky Barrier Diode | Microchip
The Microchip Technology 1N5711UR-1 is a small-signal Schottky barrier diode rated for 50 V reverse voltage and 33 mA average forward current, packaged in a hermetically sealed glass DO-213AA (MELF, SOD-80/LL34) surface-mount case. It is a member of the metallurgically bonded 1N5711UR-1 / 1N5712UR-1 / 1N6857UR-1 / 1N6858UR-1 high-reliability Schottky diode family, with the "1N" prefix denoting military-grade qualification for high-reliability applications. A Schottky barrier diode is a semiconductor diode formed by a metal-semiconductor junction instead of a conventional P-N junction. This structure delivers a lower forward voltage drop and near-zero reverse recovery charge, placing it among switching and signal diodes within the broader diode, discrete semiconductor, and passive/discrete component hierarchy. Its fast switching behavior makes it a staple in RF detection, clamping, and high-speed logic environments. Key features of the 1N5711UR-1 include its military-grade qualification, metallurgically bonded die construction for mechanical robustness, and hermetically sealed glass packaging that protects the junction against moisture and contamination. The MELF DO-213AA package supports automatic placement in cylindrical pad layouts and offers excellent resistance to vibration compared with chip-style SMD packages. Technically, the device relies on the Schottky metal-semiconductor barrier to achieve majority-carrier conduction, eliminating minority-carrier storage time and enabling very fast switching. Terminals are tin/lead plated or RoHS-compliant matte-tin over copper-clad steel (commercial grade), and solderability is verified per MIL-STD-750 method 2026, underlining its defense and aerospace pedigree. Typical applications include RF signal detection and mixing, high-speed switching power supplies operating at low current, clamp and protection circuits, and high-reliability military or aerospace subsystems where hermetic packaging is mandated. A key design consideration is the modest 33 mA current rating: at higher currents a 1N5711-class part conducts a forward voltage drop that increases dissipation, so engineers should verify average forward current and surge conditions before substituting higher-current rectifiers. This page synthesizes distributor pricing context, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.
1N5711WS-7-F - 70V 15mA RF Schottky Diode SOD-323 | Diodes Inc
The Diodes Incorporated 1N5711WS-7-F is a surface mount Schottky barrier RF diode rated for 70V peak reverse voltage and 15 mA forward current, delivering 150 mW power dissipation in a compact SOD-323 (SC-76) 2-pin package. It is the SOD-323 equivalent of the classic 1N5711 DO-35 RF Schottky. A Schottky barrier diode is a rectifier formed by a metal-semiconductor junction instead of a conventional P-N junction, resulting in a low forward voltage, extremely fast switching (no reverse recovery charge), and low junction capacitance. Within the power management and discrete semiconductor hierarchy, RF Schottky diodes such as the 1N5711WS-7-F sit at the low-current, high-frequency end of the rectifier family, specialized for signal detection, mixing, and high-speed switching rather than power rectification. Key features include a 70V reverse voltage rating that is unusually high for a small-signal Schottky, a low junction capacitance of 2 pF at 0V, 1 MHz, and metal-to-silicon barrier construction that eliminates reverse recovery time. The -7-F suffix indicates lead-free, RoHS-compliant tape-and-reel packaging suited to automated SMT assembly. The low 2 pF capacitance and fast switching make this part ideal for RF detector circuits, video detectors, high-speed logic clamps, and sampling gates up into the hundreds of megahertz. The 15 mA current rating confines it to signal-level duties; it is not a power rectifier. Typical applications include RF envelope detectors in receiver front ends, sample-and-hold and peak-detect circuits, UHF mixers, and reverse-polarity or ESD clamp roles in high-speed digital lines where silicon diodes would be too slow. When designing, remember that Schottky leakage rises steeply with temperature; derate the 150 mW rating at elevated ambient temperature and verify the 70V rating includes transients. This page adds distributor pricing tiers, verified drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet.
1N5819-E3/73 - 40V 1A Schottky Rectifier DO-41 | Vishay
The Vishay 1N5819-E3/73 is a 40 V, 1 A axial-lead Schottky barrier rectifier in the DO-204AL (DO-41) through-hole package, supplied on tape-and-reel (the "/73" Ammo Pack suffix). It is part of Vishay's 1N5819 series of low-forward-voltage, high-frequency rectifiers built around a Schottky metal-semiconductor junction rather than a PN junction, eliminating reverse-recovery charge and giving sub-microsecond switching. What is a Schottky rectifier? A Schottky rectifier (named after physicist Walter H. Schottky) is a majority-carrier diode formed by a metal-semiconductor junction. Compared with a conventional PN-junction rectifier such as the 1N400x series, a Schottky rectifier exhibits a lower forward voltage drop (typically 0.3-0.6 V versus 0.7-1.0 V), faster switching with no reverse-recovery charge, and better high-frequency efficiency. Within the discrete-semiconductor taxonomy, the 1N5819 belongs to: Schottky diode -> rectifier diode -> discrete semiconductor -> power management component. Key specifications of the 1N5819-E3/73 include a 40 V maximum repetitive peak reverse voltage (VRRM), 1 A average rectified forward current (IF(AV)) at TL = 90 °C, a typical forward voltage of 450 mV at 1 A and a maximum of 600 mV at 1 A, an IFSM surge rating of 25 A (8.3 ms half-sine), and a maximum DC reverse leakage of 1.0 mA at TA = 25 °C / VR = 40 V. Operating junction temperature spans -65 °C to +125 °C. The architecture is a single-chip passivated Schottky barrier in an epoxy-molded DO-41 body with axial terminations, corrosion-resistant external finish and solderable matte-tin leads. The metal barrier is formulated for low VF while keeping reverse leakage within datasheet limits. Typical applications include low-voltage DC/DC converter freewheel and rectification stages, OR-ing diodes in redundant power supplies, polarity-protection circuits on battery-operated and USB-powered devices, solar-panel blocking diodes, and high-frequency switching-mode power supply secondary rectifiers where the absence of reverse-recovery loss is critical. When designing with this part, pay attention to the derating curve - the 1 A rating assumes TL ≤ 90 °C and at TA = 25 °C the continuous current must be derated to about 0.5 A or less. The low forward voltage (450 mV typical) makes it especially attractive in low-voltage rails where silicon PN diodes would dissipate unacceptable power. This page synthesizes distributor pricing, DO-41 drop-in alternatives, and practical thermal-derating notes not found in the manufacturer datasheet.
1N6263 - 60V 15mA Schottky Diode DO-35 | STMicroelectronics
The STMicroelectronics 1N6263 is a small-signal metal-to-silicon Schottky barrier diode rated for 60 V reverse voltage and 15 mA average forward current in the axial-leaded DO-35 through-hole glass package. It is engineered for high-level UHF/VHF detection and fast pulse applications requiring a broad dynamic range, combining high breakdown voltage, low turn-on voltage, and ultrafast switching in one through-hole device. A Schottky diode is a semiconductor diode formed by a metal-to-silicon junction rather than a conventional PN junction. This metal-semiconductor barrier stores far less charge than a PN junction, giving Schottky diodes near-zero reverse recovery time and a lower forward voltage drop at comparable currents. Within the power-management hierarchy, the 1N6263 belongs to the family of small-signal switching and detection diodes, sitting below power rectifiers and alongside RF detector diodes such as the 1N5711. Key differentiating features include a 60 V reverse voltage rating that is high for a small-signal Schottky, ultrafast switching with effectively no reverse recovery, and a guard-ring structure. The guard-ringed metal-on-silicon barrier improves reverse leakage behavior and breakdown stability, allowing use both as an RF detector and as a steering, biasing, or MOS-protection element. Technically, the low barrier height of the metal-silicon junction yields the low turn-on voltage that makes the device attractive for envelope detection, logarithmic detectors, and video detection circuits. Because switching speed is limited by junction capacitance rather than stored charge, the 1N6263 responds well to fast pulses and high-frequency signals in the UHF/VHF range, where PN small-signal diodes such as the 1N4148 lose detection efficiency. Typical applications include UHF/VHF signal detection, fast pulse clipping and clamping, protection of MOS devices against voltage excursions, and general-purpose switching in instrumentation. In detector circuits the diode sits directly at the signal node, where its low forward drop extends usable dynamic range. A key design consideration is that Schottky diodes exhibit higher reverse leakage than PN diodes, and leakage increases strongly with temperature; derate current at elevated ambient temperature. Verify the 15 mA average forward current limit and avoid power rectification duty. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
1N6263W-7 - 60V 15mA SOD-123 Schottky Diode | Diodes Inc.
The Diodes Incorporated 1N6263W-7 is a small-signal Schottky barrier diode rated for 60 V reverse voltage and 15 mA average rectified current, with a maximum forward voltage of 1 V at 15 mA and a 1 ns reverse recovery time, housed in a 2-pin SOD-123 surface-mount package. A Schottky barrier diode is a semiconductor rectifier that uses a metal-semiconductor junction instead of a conventional P-N junction, giving it a lower forward voltage drop and far faster switching speed than standard silicon diodes. Within the broader component hierarchy, the 1N6263W-7 belongs to the small-signal diode family, a subset of rectifier diodes, which in turn are core discrete semiconductors used for signal detection, clamping, and low-power rectification in power management and signal-chain circuits. Key features of the 1N6263W-7 include its low forward voltage drop for reduced conduction loss, guard ring construction that provides transient protection against voltage spikes, and an extremely fast switching time of approximately 1 ns reverse recovery, making it suitable for high-frequency signal paths. The 60 V reverse rating offers generous margin in 12 V, 24 V, and 28 V rail environments, while the compact SOD-123 package (approximately 3.7 mm x 1.6 mm body) conserves PCB area. Technically, the guard-ring terminated metal-semiconductor junction balances low leakage with robust avalanche behavior, and the 250 mW power dissipation rating allows small-signal rectification and clamping duty at modest currents. The Schottky structure eliminates reverse recovery charge, so switching losses remain negligible even at MHz frequencies, unlike fast-recovery P-N diodes that require trr typically in the tens of nanoseconds. Typical applications include RF and IF signal detection in receivers, high-speed logic clamping and line termination, low-power rectification in auxiliary supplies, and reverse-polarity or freewheeling protection in low-current circuits. The 1 ns trr and 60 V rating make the part especially appropriate where both speed and voltage margin are required simultaneously. When designing with this device, remember that Schottky diodes exhibit higher reverse leakage than P-N diodes and leakage roughly doubles every 10 C, so thermal budgeting of leakage is important in precision or battery-powered circuits. Derate the 250 mW rating above 25 C ambient per the manufacturer datasheet. This page synthesizes distributor availability data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
1N6263W-7-F - 60V 15mA Schottky Diode SOD-123 | Diodes Inc.
The Diodes Incorporated 1N6263W-7-F is a surface-mount Schottky barrier diode rated at 60 V DC reverse voltage (VR), 15 mA average rectified output current (IO), and 250 mW power dissipation, housed in a 2-pin SOD-123 package supplied in tape and reel. A Schottky barrier diode is a semiconductor rectifier that uses a metal-semiconductor junction instead of a conventional P-N junction. Because it conducts via majority carriers, it exhibits negligible reverse recovery charge and a low forward voltage, placing it at the fast end of the rectifier hierarchy (diode -> rectifier -> Schottky barrier diode -> discrete semiconductor). This makes Schottky devices the preferred choice wherever switching speed and low loss matter more than ultra-low leakage. Key features of the 1N6263W-7-F include a maximum forward voltage of 1 V at 15 mA, an ultra-fast reverse recovery time of 1 ns, guard ring construction for transient protection, and fast switching performance. The guard-ring structure improves robustness against voltage transients, an advantage over unguarded small-signal Schottky diodes. The SOD-123 surface-mount package supports automated pick-and-place assembly with a compact footprint suitable for dense PCB layouts. Technically, the metal-semiconductor junction of the 1N6263W series provides majority-carrier conduction, eliminating minority-carrier storage time entirely; the specified 1 ns reverse recovery reflects this intrinsic characteristic. The 60 V rating places this part in the mid-voltage small-signal Schottky segment, above the common 30-40 V parts, making it suitable for higher-rail signal detection and protection tasks. Typical applications include high-speed signal detection and mixing in RF front ends, reverse polarity and transient clamping in low-current lines, and freewheeling or steering duty in low-power switching circuits where 15 mA of continuous current is sufficient. When designing with this device, remember that Schottky reverse leakage rises steeply with temperature; verify worst-case leakage at your maximum ambient temperature rather than at 25 C, especially in high-impedance or charge-holding circuits. This page synthesizes distributor pricing, drop-in alternatives, cross-reference data, and practical design notes not found in the manufacturer datasheet.
1N6489US - 4.7V 1.5W Zener Diode SQ-MELF | Microchip
The Microchip Technology 1N6489US is a 4.7 V nominal, 1.5 W surface-mount Zener diode in the SQ-MELF (A-MELF) hermetic glass package with ±5% voltage tolerance. It is part of the 1N6469US through 1N6491US military-qualified Zener regulator series designed for high-reliability applications where component failure cannot be tolerated. A Zener diode is a specialized silicon pn-junction diode engineered to operate in the reverse-breakdown (Zener) region, where it maintains a near-constant voltage across its terminals despite variations in current. This makes Zener diodes the canonical building block for voltage reference, voltage regulation, and overvoltage protection circuits in analog and mixed-signal designs. The 1N6489US occupies the low-voltage end of the 1N6469-1N6491 family, with a 4.7 V nominal Zener voltage that is commonly used as a logic-rail reference (5 V systems with allowance for tolerance), A/D and D/A reference, and instrument-amplifier bias. Key specifications include a nominal Zener voltage (Vz) of 4.7 V ±5%, maximum Zener impedance (Zzt) of 8 Ω at the test current, maximum reverse leakage (Ir) of 4 µA at 1 V reverse bias, and a maximum power dissipation of 1.5 W at 25 °C ambient with proper thermal mounting. The hermetically sealed SQ-MELF (US-suffix) package provides MIL-PRF-19500/406 qualification for military and aerospace applications, distinguishing it from the axial-leaded DO-41 (non-US) variant of the same die. The 1N6489US uses a glass-passivated silicon junction die bonded in a hermetic metal-glass envelope, yielding long-term stability and low reverse leakage. The 8 Ω maximum Zener impedance ensures tight voltage regulation even at low Zener currents, making the part suitable for low-noise reference designs. The MIL-PRF-19500/406 qualification and hermetic construction deliver the reliability expected in defense, avionics, and space-grade power subsystems. Typical applications include 5 V system voltage references, op-amp supply rails, A/D and D/A converter references, overvoltage clamps on signal lines, and military/aerospace power-conditioning circuits. The 1.5 W rating also makes it usable as a low-power shunt regulator in distributed power systems. When designing with the 1N6489US, ensure the PCB land pattern matches the SQ-MELF (A-MELF) footprint, which differs from the axial DO-41 of the non-US 1N6489. Provide adequate copper thermal area on both anode and cathode pads; derate to 0.8 W or less above 75 °C ambient. Use a series current-limiting resistor sized so that Iz stays within the datasheet test-current window to guarantee the 4.7 V regulation point. This page synthesizes Microchip/Microsemi distributor pricing, MIL-spec qualification details, drop-in alternatives in the same SQ-MELF footprint, and practical thermal design notes not consolidated in the manufacturer datasheet alone.
1N6489US-TR - 4.7V 1.5W Zener Diode D-5A | Microchip
The Microchip 1N6489US-TR is a 1.5 W surface-mount Zener voltage regulator diode with a nominal Zener voltage of 4.7 V and ±5% tolerance, housed in the hermetic D-5A (SQ-MELF, A) package. It is qualified to MIL-PRF-19500/406 for high-reliability applications and features a typical Zener impedance Zzt of 8 ohms with low reverse leakage of 4 µA at 1 V, making it a precision reference element in dense PCB designs. The D-5A MELF-style glass package supports automated tape-and-reel assembly while retaining the thermal dissipation required for continuous 1.5 W operation. A Zener diode is a specialized PN-junction diode engineered to operate in the reverse-bias breakdown region, where the voltage across the device remains nearly constant over a wide range of current. Zeners are widely used as shunt voltage regulators, voltage references, protection clamps, and waveform clippers across analog, power, and digital systems. In the broader component taxonomy, the 1N6489US-TR sits within discrete semiconductors → diodes → Zener diodes, and is one of the industry-recognized 1N64xx-series 1.5 W regulators from multiple defense-grade qualified vendors. Key features include 1.5 W maximum power dissipation at 25 °C (derated linearly to 0 W at 200 °C), a nominal Zener voltage of 4.7 V at Izt = 53 mA, maximum Zener impedance of 8 Ω, low reverse leakage of 4 µA at 1 V VR, and a hermetically sealed glass MELF package. Operating junction and storage temperature range is -65 °C to +200 °C, with a thermal resistance suitable for typical PCB-mount thermal designs. The 1N6489US-TR uses a hermetically sealed glass axial-leaded MELF construction that is mechanically robust and suitable for military and aerospace environments. Its precisely controlled breakdown voltage and tight tolerance make it a preferred choice for reference rails, ADC/DAC references, op-amp supply clamps, and overvoltage protection in sensitive analog front-ends. Typical applications include precision voltage reference circuits, op-amp supply rail clamping, ADC/DAC reference buffering, overvoltage protection for analog input stages, and shunt regulation in industrial 24 V loop-powered instrumentation. The hermetic MELF construction also supports downhole, avionics, and military field-deployed equipment where reliability under thermal cycling is mandatory. When designing with this Zener, ensure the working reverse current is well below the test current Izt so that the impedance does not rise excessively, and provide adequate PCB copper to dissipate up to 1.5 W continuous. For tighter tolerance requirements, series-characterize individual devices or consider a precision band-gap reference IC instead. This page synthesizes distributor pricing, drop-in alternatives in the same D-5A MELF footprint, and practical design considerations that are not collected together in the manufacturer datasheet.