My Inquiry
My Account
Taiwan Semiconductor Corporation US1AHM2G
- Part No.:
- US1AHM2G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
US1AHM2G.pdf
- Description:
- DIODE GEN PURP 50V 1A DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,234
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
US1AHM2G from Taiwan Semiconductor is a 50 V, 1 A ultrafast surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring 1.0 V max forward voltage at 1 A, 50 ns reverse recovery time, and 30 A peak surge current - deployed in DC/DC converter output stages and snubber networks.
For engineers reviewing the US1AHM2G datasheet, US1AHM2G pinout, US1AHM2G application, or US1AHM2G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (RθJL = 27 °C/W), junction temperature range (–55 to +150 °C), and RoHS/halogen-free compliance for industrial power conversion designs.
Technical Context
This device is a single-die, unidirectional, planar passivated silicon PN junction rectifier optimized for high-frequency switching operation. Its ultrafast recovery (50 ns) and low forward voltage (≤1.0 V @ 1 A, 25 °C) minimize conduction and switching losses in flyback and forward converter topologies.
The DO-214AC (SMA) package provides standardized surface-mount compatibility with J-STD-002 solderability, JESD201 Class 2 whisker resistance, and UL 94V-0 mold compound - supporting automated placement and reflow processes without derating below 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse blocking voltage; defines safe operating limit in clamp/snubber circuits |
| IF | 1 A continuous - rated average forward current at TL = 75 °C; determines heatsink-free power handling in compact converters |
| IFSM | 30 A - non-repetitive surge rating for startup/inrush events; enables robustness against transient overloads |
| trr | 50 ns - ultrafast reverse recovery; reduces switching loss and EMI in >100 kHz SMPS designs |
| VF | ≤1.0 V @ 1 A, 25 °C - low conduction drop improves efficiency in low-voltage secondary-side rectification |
| RθJL | 27 °C/W - junction-to-lead thermal resistance; supports direct PCB copper pour thermal coupling without external heatsink |
| Junction Temp | –55 to +150 °C - extended operating range enables use in automotive under-hood and industrial motor drive environments |
Pinout & Package
Package: DO-214AC (SMA), molded plastic case with matte tin-plated leads; cathode indicated by band; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node return) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to output rail or snubber capacitor positive; blocks reverse voltage up to 50 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable leakage performance (<5 µA @ 25 °C) and long-term reliability under humidity stress |
| Ultrafast recovery (50 ns) | Reduces reverse recovery charge (Qrr) and associated switching loss in high-frequency converters |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow; supports standard SMT assembly without special handling |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export markets |
| DO-214AC mechanical standardization | Ensures footprint compatibility across multiple vendors and simplifies second-source procurement |
Applications
| DC/DC Converter Output Rectification | Snubber Network Clamp Diode |
|---|---|
Use Scenario: Secondary-side rectification in isolated 5–24 V output flyback converters powering industrial sensors. IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion; operates at switching frequencies up to 500 kHz. Use Value: Low VF (≤1.0 V) minimizes conduction loss; 50 ns trr prevents cross-conduction during synchronous switching transitions. | Use Scenario: RCD snubber across MOSFET drain-source in 65–130 kHz LLC resonant converters. IC Role / Device Role / Timing Role: Fast clamping of voltage spikes during MOSFET turn-off; absorbs inductive energy from transformer leakage inductance. Use Value: 50 V VRRM and 30 A IFSM withstand repetitive 40–60 V transients; ultrafast recovery avoids snap-off oscillation. |
| Freewheeling Diode in Buck Regulators | Lighting Driver Flyback Rectifier |
Use Scenario: Freewheel path for inductor current in 12 V input buck regulators driving LED drivers or microcontroller rails. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side switch off-time; conducts 100% duty-cycle worst-case current. Use Value: 1 A IF rating matches typical buck output currents; DO-214AC footprint allows dense layout adjacent to power inductor. | Use Scenario: Output rectification in constant-current LED drivers for commercial downlights (24–48 V output). IC Role / Device Role / Timing Role: Converts high-frequency transformer output to regulated DC; handles pulsed load currents with minimal voltage overshoot. Use Value: 50 ns trr suppresses ringing on LED string nodes; halogen-free construction meets IEC 62471 photobiological safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR105 | VRRM = 50 V, trr = 50 ns, VF = 1.05 V @ 1 A - slightly higher forward drop; same DO-214AC package | Identical mounting and thermal interface; marginally lower efficiency at full load due to VF delta | Select when ON Semi supply chain alignment or qualification history is required; verify VF impact on thermal budget |
| Vishay VS-1N4933 | VRRM = 50 V, trr = 200 ns, VF = 1.0 V - significantly slower recovery; legacy through-hole TO-220AC package | Not surface-mount compatible; unsuitable for >100 kHz designs due to excessive Qrr and EMI | Only acceptable for low-frequency (<30 kHz), through-hole legacy upgrades where board redesign is prohibited |
Compared with MUR105 and VS-1N4933, US1AHM2G delivers identical ultrafast timing with lower forward voltage than MUR105 and full SMT compatibility absent in VS-1N4933 - making it optimal for space-constrained, high-efficiency 100–500 kHz power stages.
Availability
US1AHM2G is available at Aetrix Electronics and suitable for DC/DC converters, snubber networks, and lighting driver designs requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for US1AHM2G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and consumer markets.
The US1A–US1M series was engineered specifically for high-frequency switching power supplies, emphasizing ultrafast recovery, low VF, and robust thermal performance in compact surface-mount packages.
FAQ
What is the maximum junction temperature rating for US1AHM2G?
The US1AHM2G has a maximum junction temperature (TJ) of +150 °C and a minimum of –55 °C. This wide range allows reliable operation in demanding environments such as industrial motor drives and automotive under-hood applications. The device's RθJL of 27 °C/W enables effective heat transfer to the PCB copper, and its thermal performance is validated per JEDEC standards. US1AHM2G maintains stable electrical parameters across this full range when operated within absolute maximum ratings.
Is US1AHM2G suitable for use in a 300 kHz flyback converter?
Yes, US1AHM2G is explicitly designed for high-frequency switching applications including 300 kHz flyback converters. Its 50 ns reverse recovery time and low forward voltage (≤1.0 V @ 1 A) minimize switching losses and conduction losses at that frequency. The device's low junction capacitance (15 pF @ 1 MHz, 4 V) further reduces capacitive coupling noise. US1AHM2G has been characterized in such topologies per TSC Application Note AN-2102 and is widely deployed in commercial 24 V output flyback designs.
Does US1AHM2G meet lead-free soldering requirements?
Yes, US1AHM2G features matte tin-plated leads compliant with J-STD-002 for solderability and is rated for lead-free reflow profiles (peak temperature ≤260 °C). It carries moisture sensitivity level 1 per J-STD-020, eliminating pre-bake requirements. The device is RoHS-compliant and halogen-free per IEC 61249-2-21, making it fully compatible with modern lead-free SMT assembly lines. US1AHM2G has passed JESD201 Class 2 whisker testing to ensure long-term interconnect reliability.
What is the marking code on the US1AHM2G package?
The US1AHM2G is marked "US1A" on the device body, consistent with Taiwan Semiconductor's standard coding for the 50 V variant in the US1A–US1M family. The "HM2G" suffix in the orderable part number denotes tape-and-reel packaging (7,500 pcs/reel), green compound, and date code format. The cathode is indicated by a visible band on the DO-214AC (SMA) body. US1AHM2G markings are laser-etched for permanent legibility after reflow and conformal coating.
Can US1AHM2G replace a 1N4001 in an existing design?
No - US1AHM2G is not a direct replacement for the 1N4001. While both are 1 A rectifiers, the 1N4001 is a general-purpose, slow-recovery (≈30 µs) diode rated for 50 V PIV but unsuitable for switching above ~10 kHz. US1AHM2G is an ultrafast (50 ns) device optimized for high-frequency SMPS. Substituting it into a line-frequency transformer design may cause unnecessary cost and layout complexity. US1AHM2G should only replace 1N4001 if the circuit operates >50 kHz and benefits from reduced switching loss - always validate with actual waveform measurements. US1AHM2G is not intended as a drop-in upgrade for legacy linear supplies.
US1AHM2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1AHM2G FAQ
1.How can I place an order for US1AHM2G through Aetrix?
Please submit a Request for Quotation (RFQ) for US1AHM2G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for US1AHM2G reliable?
The price and inventory of US1AHM2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1AHM2G is usually 5 days.
3.What payment methods are accepted for US1AHM2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1AHM2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1AHM2G?
US1AHM2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1AHM2G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for US1AHM2G?
For technical support, including US1AHM2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1AHM2G requirements.
6.How does Aetrix verify that US1AHM2G is sourced from the original manufacturer or authorized distributors?
All US1AHM2G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that US1AHM2G meets industry standards.
7.What is the process for return or replacement of US1AHM2G?
All US1AHM2G units undergo pre-shipment inspection (PSI). If there is an issue with US1AHM2G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The US1AHM2G part is unused and in its original packaging.
Return procedure for US1AHM2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
US1AHM2G Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
