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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation TSU1M45H

Name: TSU1M45H
Brand: Taiwan Semiconductor Corporation
SKU: TSU1M45H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSU1M45H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: 2-SMD, Flat Leads

Datasheet:: TSU1M45H.pdf

Description:: 1A, 45V, TRENCH SCHOTTKY

Quantity:: RFQ Add To RFQ list

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Inventory:6,798

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Product details

Overview

TSU1M45H from Taiwan Semiconductor is a 1 A, 45 V trench Schottky surface-mount rectifier in Micro SMA package, featuring low forward voltage (0.52 V @ 1 A, 25°C), 25 A surge rating, and AEC-Q101 qualification for automotive power conversion.

For engineers reviewing the TSU1M45H datasheet, TSU1M45H pinout, TSU1M45H application, or TSU1M45H equivalent, key selection criteria include junction-to-lead thermal resistance (20 °C/W), moisture sensitivity level 1 compliance, and cathode-band polarity marking for reliable automated placement in SMPS and on-board DC/DC converters.

Technical Context

The TSU1M45H employs trench Schottky technology to achieve low conduction loss and high switching efficiency without reverse recovery charge. Its single-die configuration supports continuous 1 A forward current with junction temperature range from –55°C to +175°C.

Thermal performance is validated on a 5 mm × 5 mm Cu pad PCB: R_θJL = 20 °C/W enables effective heat transfer to the PCB lead, while R_θJA = 73 °C/W reflects ambient-limited dissipation under standard test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	45 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in DC/DC flyback or buck output rectification.
I_F	1 A - Continuous forward current rating at 25°C ambient; derates linearly above 25°C per forward current curve.
I_FSM	25 A (8.3 ms) - Non-repetitive surge capability; supports inrush current handling in adapter and lighting applications.
V_F	0.52 V max @ 1 A, 25°C - Low conduction loss reduces power dissipation and improves system efficiency in high-frequency SMPS.
T_J max	+175°C - High junction temperature rating enables operation in under-hood automotive environments without thermal shutdown.
C_J	156 pF @ 4 V - Junction capacitance impacts high-frequency switching noise and EMI; suitable for ≤1 MHz converter topologies.

Pinout & Package

Package: Micro SMA - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity indicator. Weight: 0.006 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); requires low-inductance layout for EMI control.
Cathode	Forward current exit point	Marked by visible band; connects to output rail; must be routed with adequate copper area for thermal relief and current capacity.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control and ADAS power supplies.
Trench Schottky architecture	Eliminates minority-carrier storage delay and reverse recovery charge, enabling zero Q_rr and reduced switching losses vs. PN diodes.
Moisture sensitivity level 1	No floor life limitation or bake requirement before reflow; simplifies SMT line integration and reduces manufacturing overhead.
R_θJL = 20 °C/W	Enables direct thermal coupling to PCB copper; supports >0.8 W continuous power dissipation with minimal board-level heatsinking.

Applications

Automotive On-Board DC/DC Converter	LED Lighting Driver
Use Scenario: Step-down conversion from 12 V battery to 5 V/3.3 V rails for infotainment and sensor modules. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck converter; handles high-frequency switching current with minimal loss. Use Value: 0.52 V forward drop at 1 A reduces conduction loss by ~35% vs. comparable PN diodes, improving thermal margin in confined under-dash space.	Use Scenario: Constant-current LED driver in commercial downlights and streetlight modules. IC Role / Device Role / Timing Role: Freewheeling diode in boost or buck-boost topology; clamps inductive kick during MOSFET off-time. Use Value: 175°C max junction temperature allows operation near hot LED arrays without derating, supporting compact thermal design.
USB-C Power Adapter	Industrial SMPS Auxiliary Supply
Use Scenario: Secondary-side rectification in 20–65 W USB PD adapters with high-density PCB layouts. IC Role / Device Role / Timing Role: High-efficiency output rectifier replacing traditional Si diodes to meet CoC Tier 2 efficiency requirements. Use Value: Low R_θJL (20 °C/W) and Micro SMA footprint enable thermal performance matching larger SMA packages-no layout redesign needed.	Use Scenario: Standby or auxiliary supply in PLCs, HMIs, and motor drives requiring long-term reliability. IC Role / Device Role / Timing Role: Input or output rectifier in isolated flyback or forward converter powering control logic. Use Value: AEC-Q101 qualification and –55°C to +175°C operation ensure stable performance across industrial temperature extremes and 10+ year field life.

Automotive On-Board DC/DC Converter

LED Lighting Driver

Use Scenario: Step-down conversion from 12 V battery to 5 V/3.3 V rails for infotainment and sensor modules.

IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck converter; handles high-frequency switching current with minimal loss.

Use Value: 0.52 V forward drop at 1 A reduces conduction loss by ~35% vs. comparable PN diodes, improving thermal margin in confined under-dash space.

Use Scenario: Constant-current LED driver in commercial downlights and streetlight modules.

IC Role / Device Role / Timing Role: Freewheeling diode in boost or buck-boost topology; clamps inductive kick during MOSFET off-time.

Use Value: 175°C max junction temperature allows operation near hot LED arrays without derating, supporting compact thermal design.

USB-C Power Adapter

Industrial SMPS Auxiliary Supply

Use Scenario: Secondary-side rectification in 20–65 W USB PD adapters with high-density PCB layouts.

IC Role / Device Role / Timing Role: High-efficiency output rectifier replacing traditional Si diodes to meet CoC Tier 2 efficiency requirements.

Use Value: Low R_θJL (20 °C/W) and Micro SMA footprint enable thermal performance matching larger SMA packages-no layout redesign needed.

Use Scenario: Standby or auxiliary supply in PLCs, HMIs, and motor drives requiring long-term reliability.

IC Role / Device Role / Timing Role: Input or output rectifier in isolated flyback or forward converter powering control logic.

Use Value: AEC-Q101 qualification and –55°C to +175°C operation ensure stable performance across industrial temperature extremes and 10+ year field life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS14 (Diodes Inc.)	Same 1 A / 40 V rating but higher V_F (0.55 V typ @ 1 A); no AEC-Q101 qualification; R_θJA = 100 °C/W.	Suitable for consumer adapters and lighting where automotive qualification and thermal performance are not required.	Select SS14 only when cost sensitivity outweighs automotive compliance and thermal efficiency needs.
SB140 (ON Semiconductor)	1 A / 40 V, V_F = 0.5 V max @ 1 A, but uses planar Schottky process; not AEC-Q101 qualified; MSL level 1 confirmed.	Acceptable for industrial SMPS where junction temperature remains below 150°C and qualification traceability is optional.	Choose SB140 if legacy design reuse is prioritized over automotive-grade reliability and peak thermal capability.

Compared with SS14 and SB140, the TSU1M45H delivers superior thermal performance (R_θJL = 20 °C/W), guaranteed AEC-Q101 compliance, and tighter V_F specification-making it the preferred choice for thermally constrained, automotive-qualified, or high-reliability industrial power designs.

Availability

TSU1M45H is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, LED lighting drivers, and USB-C power adapters requiring stable component supply and long-term production continuity.

Supply support for TSU1M45H 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, serving global automotive, industrial, and consumer markets since 1979.

The TSU1M45H belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in automotive and industrial environments where thermal robustness and process consistency are critical.

FAQ

What is the maximum junction temperature rating for the TSU1M45H?

The TSU1M45H has a maximum junction temperature (T_J) of +175°C, verified per absolute maximum ratings table. This enables reliable operation in under-hood automotive applications and high-ambient industrial environments. The device maintains specified electrical performance up to this limit, provided thermal design ensures actual junction temperature stays within bounds. Thermal derating curves in the datasheet guide safe current reduction above 25°C ambient.

Is the TSU1M45H suitable for automotive applications?

Yes, the TSU1M45H is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, high-temperature reverse bias, and ESD required for automotive power electronics. It is explicitly recommended for automotive on-board DC/DC converters and meets JESD201 Class 2 whisker resistance. Its –55°C to +175°C operating range and MSL Level 1 handling further support automotive manufacturing and field reliability.

What does the marking code 'Z1' indicate on the TSU1M45H package?

The marking code 'Z1' on the TSU1M45H identifies the specific device variant and is laser-etched on the cathode side of the Micro SMA package. Per datasheet Section "Absolute Maximum Ratings", 'Z1' corresponds exclusively to the TSU1M45H part number and confirms its 45 V V_RRM and 1 A I_F rating. It is not a generic family code and must be verified visually during incoming inspection.

How does the TSU1M45H compare to standard PN junction rectifiers in SMPS applications?

The TSU1M45H uses trench Schottky technology, eliminating reverse recovery time (t_rr ≈ 0) and associated switching losses that plague PN rectifiers. With V_F as low as 0.43 V @ 1 A and 125°C, it achieves higher efficiency and lower EMI in high-frequency SMPS. Unlike PN diodes, it requires no snubber network and supports simpler, more compact layouts-critical for space-constrained USB-C adapters and automotive ECUs.

What is the thermal resistance from junction to lead (R_θJL) for the TSU1M45H, and why does it matter?

The TSU1M45H has a typical junction-to-lead thermal resistance (R_θJL) of 20 °C/W, measured with the device mounted on a 5 mm × 5 mm Cu pad PCB. This parameter directly determines how effectively heat flows from the die to the PCB copper via the leads. A low R_θJL enables higher power dissipation without exceeding T_J max, reducing need for external heatsinks and supporting miniaturized power designs in lighting and adapter applications.

TSU1M45H Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: 2-SMD, Flat Leads

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 45 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 600 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 80 µA @ 45 V

Capacitance @ Vr, F:: 156pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: Micro SMA

Operating Temperature - Junction:: -55°C ~ 175°C

TSU1M45H FAQ

1.How can I place an order for TSU1M45H through Aetrix?

Please submit a Request for Quotation (RFQ) for TSU1M45H 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 TSU1M45H reliable?

The price and inventory of TSU1M45H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSU1M45H is usually 5 days.

3.What payment methods are accepted for TSU1M45H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSU1M45H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSU1M45H?

TSU1M45H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSU1M45H 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 TSU1M45H?

For technical support, including TSU1M45H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSU1M45H requirements.

6.How does Aetrix verify that TSU1M45H is sourced from the original manufacturer or authorized distributors?

All TSU1M45H 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 TSU1M45H meets industry standards.

7.What is the process for return or replacement of TSU1M45H?

All TSU1M45H units undergo pre-shipment inspection (PSI). If there is an issue with TSU1M45H, 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 TSU1M45H part is unused and in its original packaging.

Return procedure for TSU1M45H:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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