My Inquiry
My Account
Taiwan Semiconductor Corporation SS1H4LSH
- Part No.:
- SS1H4LSH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123H
- Datasheet:
-
SS1H4LSH.pdf
- Description:
- 1A, 40V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:19,984
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SS1H4LSH from Taiwan Semiconductor is a 1A, 40V Schottky barrier surface-mount rectifier in SOD-123HE package, featuring ultra-low forward voltage (0.65 V at 1 A, 25°C), low leakage current (≤1.0 µA at 25°C), and high surge capability (30 A IFSM). It serves as a high-efficiency output rectifier in compact DC/DC converters and AC/DC adapters.
For engineers reviewing the SS1H4LSH datasheet, SS1H4LSH pinout, SS1H4LSH application, or SS1H4LSH equivalent, key selection criteria include its 40 V VRRM rating, 0.65 V VF at rated current, 30 A surge tolerance, thermal resistance (RθJL = 20°C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Schottky rectifier uses a single-die construction optimized for low conduction loss and fast switching in high-frequency power conversion. Its SOD-123HE package enables automated placement with <0.85 mm profile and meets JESD201 Class 2 whisker resistance.
Designed for operation up to 150°C junction temperature, it delivers stable reverse leakage (<0.3 mA at 125°C) and maintains low VF across temperature-critical for thermally constrained SMPS designs where efficiency and thermal management are tightly coupled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 12–24 V output circuits |
| IF | 1 A continuous - Rated average forward current; supports typical 5–12 W DC/DC stage outputs |
| VF @ 1 A, 25°C | 0.65 V max - Low conduction loss reduces heat generation and improves system efficiency |
| IFSM | 30 A (8.3 ms) - Withstands transient surges during startup or load dump without failure |
| IR @ 40 V, 25°C | 1.0 µA max - Minimizes standby power loss in always-on or energy-sensitive applications |
| RθJL | 20 °C/W - Enables direct thermal path to PCB copper, supporting compact heatsinking |
| TJ max | +150 °C - Allows operation in under-hood or enclosed industrial environments |
Pinout & Package
SOD-123HE is a two-terminal surface-mount package with cathode band marking. Dimensions comply with JEDEC MO-207AE; lead finish is matte tin, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node or ground return) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to output rail or positive bus; blocks reverse voltage up to 40 V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use, including engine control modules and infotainment power rails |
| Ultra-low VF (0.65 V) | Reduces conduction loss by ~30% vs. comparable 1A silicon diodes, improving light-load efficiency |
| Low IR (1.0 µA @ 25°C) | Minimizes standby current in battery-backed or energy-harvesting systems |
| SOD-123HE profile <0.85 mm | Enables ultra-thin adapter and portable device designs with automated pick-and-place compatibility |
| J-STD-020 Level 1 MSL | Zero bake requirement before reflow; simplifies manufacturing and reduces process risk |
Applications
| USB-C PD Adapters | Automotive Body Control Modules |
|---|---|
Use Scenario: Secondary-side rectification in 20–65 W USB-C power adapters operating at 200–500 kHz switching frequency. IC Role / Device Role / Timing Role: Output synchronous rectifier replacement; conducts forward current during low-side switch on-time and blocks reverse voltage during off-time. Use Value: 0.65 V VF reduces conduction loss by >0.25 W vs. legacy silicon diodes, enabling smaller heatsinks and higher power density. | Use Scenario: 12 V DC/DC buck converter supplying 3.3 V or 5 V to microcontrollers and CAN transceivers in BCMs. IC Role / Device Role / Timing Role: Freewheeling diode in non-synchronous buck topology; clamps inductive kickback and recirculates current during high-side FET off-time. Use Value: AEC-Q101 qualification and 150°C TJ rating ensure reliability in under-dash environments with ambient temperatures up to 105°C. |
| Industrial IoT Sensor Nodes | LED Driver Secondary Rectification |
Use Scenario: Input rectification for ultra-low-power isolated flyback supplies powering wireless sensor nodes with 10-year battery life targets. IC Role / Device Role / Timing Role: AC input bridge leg or DC output rectifier; operates in discontinuous conduction mode with minimal leakage impact. Use Value: 1.0 µA IR at 25°C limits no-load power loss to sub-50 nW, preserving battery capacity over long idle periods. | Use Scenario: Output rectification in constant-current LED drivers for architectural lighting with 24–48 V output rails. IC Role / Device Role / Timing Role: High-frequency rectifier handling ripple currents up to 1 A peak in 60–100 kHz quasi-resonant topologies. Use Value: 30 A IFSM withstands inrush surges during cold-start of multi-string LED arrays without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-1EQH04-M3/5AT | Same 1A/40V rating; VF = 0.55 V typ (25°C), but IR = 5 µA max - higher leakage than SS1H4LSH | Better efficiency at light loads; less suitable for ultra-low-standby systems | Prefer SS1H4LSH when leakage-critical; prefer VS-1EQH04-M3/5AT when VF-driven efficiency dominates |
| ON Semiconductor SB140 | 1A/40V, VF = 0.54 V typ, but SOD-123 (not HE); RθJA = 120°C/W vs. 72°C/W - inferior thermal performance | Limited to lower-power or forced-air-cooled designs due to higher thermal resistance | SS1H4LSH preferred for space-constrained or passive-cooled layouts; SB140 acceptable only with ample copper pour |
Compared with VS-1EQH04-M3/5AT and SB140, the SS1H4LSH offers the best balance of ultra-low leakage (1.0 µA), industry-leading thermal resistance (RθJL = 20°C/W), and AEC-Q101 qualification-making it uniquely suited for automotive and energy-sensitive industrial applications where reliability and standby loss are jointly critical.
Availability
SS1H4LSH is available at Aetrix Electronics and suitable for USB-C PD adapters, automotive body control modules, and industrial IoT sensor nodes requiring stable component supply, automotive-grade qualification, and consistent thermal performance.
Supply support for SS1H4LSH 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 devices, rectifiers, and protection components.
The SS1H4LSH belongs to TSC's AEC-Q101-qualified Schottky rectifier family, engineered specifically for high-efficiency, low-profile power conversion in automotive and industrial applications where thermal density and leakage current are design constraints.
FAQ
What is the maximum junction temperature rating for the SS1H4LSH?
The SS1H4LSH has a maximum junction temperature (TJ max) of +150°C, verified per absolute maximum ratings in the official datasheet. This allows reliable operation in high-ambient environments such as under-hood automotive locations or sealed industrial enclosures. Derating curves confirm usable current capability down to 0.5 A at 125°C ambient with standard PCB layout, and the SS1H4LSH must be mounted on ≥1 cm² of 1 oz copper to achieve full thermal performance.
Is the SS1H4LSH pin-compatible with other SOD-123HE Schottky rectifiers?
Yes-the SS1H4LSH uses the standard SOD-123HE footprint with anode and cathode terminals in fixed positions per JEDEC MO-207AE. It shares identical pad layout, solder mask clearance, and thermal pad requirements with all SOD-123HE rectifiers, including TSC's own SS1H6LSH and third-party equivalents. No PCB redesign is needed when substituting within the same package variant, provided voltage and current ratings are verified for the target application.
Does the SS1H4LSH meet automotive qualification standards?
Yes-the SS1H4LSH is explicitly AEC-Q101 qualified, as confirmed in the product documentation and ordering information. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life. The SS1H4LSH is approved for use in automotive powertrain, chassis, and body electronics where robustness against thermal and vibration stress is mandatory.
What is the forward voltage specification for the SS1H4LSH at elevated temperature?
The SS1H4LSH forward voltage increases with junction temperature: VF is 0.65 V max at 25°C, rising to approximately 0.55 V at 125°C (typical trend per Fig.4). The datasheet does not specify a maximum VF at high temperature, but measured curves show <0.60 V at 125°C under 1 A DC conditions. This positive temperature coefficient helps current sharing in parallel configurations and improves thermal stability in the SS1H4LSH compared to silicon diodes.
How is polarity indicated on the SS1H4LSH package?
Polarity on the SS1H4LSH is marked by a visible cathode band located near one end of the SOD-123HE case. Per mechanical data, this band identifies the cathode terminal, which must connect to the higher-potential node (e.g., output rail or VBUS) in forward-biased operation. The unmarked end is the anode. This marking complies with JEDEC standards and is machine-readable for automated optical inspection during SMT assembly of the SS1H4LSH.
SS1H4LSH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123H
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 650 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123HE
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS1H4LSH FAQ
1.How can I place an order for SS1H4LSH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS1H4LSH 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 SS1H4LSH reliable?
The price and inventory of SS1H4LSH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS1H4LSH is usually 5 days.
3.What payment methods are accepted for SS1H4LSH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS1H4LSH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS1H4LSH?
SS1H4LSH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS1H4LSH 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 SS1H4LSH?
For technical support, including SS1H4LSH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS1H4LSH requirements.
6.How does Aetrix verify that SS1H4LSH is sourced from the original manufacturer or authorized distributors?
All SS1H4LSH 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 SS1H4LSH meets industry standards.
7.What is the process for return or replacement of SS1H4LSH?
All SS1H4LSH units undergo pre-shipment inspection (PSI). If there is an issue with SS1H4LSH, 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 SS1H4LSH part is unused and in its original packaging.
Return procedure for SS1H4LSH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SS1H4LSH 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…
