My Inquiry
My Account
Taiwan Semiconductor Corporation SS54ALH
- Part No.:
- SS54ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SS54ALH.pdf
- Description:
- 5A, 40V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:3,687
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SS54ALH from Taiwan Semiconductor is a 5A, 40V AEC-Q101-qualified Schottky barrier rectifier in Thin SMA package, featuring 0.58V max forward voltage at 5A/25°C, 110A surge current capability, and junction-to-lead thermal resistance of 17°C/W. It serves as a high-efficiency output rectifier in automotive-grade DC/DC converters and SMPS.
For engineers reviewing the SS54ALH datasheet, SS54ALH pinout, SS54ALH application, or SS54ALH equivalent, key selection criteria include its 40V VRRM rating, low VF at high temperature (0.53V @ 5A/125°C), AEC-Q101 qualification, and moisture sensitivity level 1 compliance - critical for automotive power supply design and automated SMT assembly.
Technical Context
The SS54ALH is a single-die Schottky rectifier optimized for low conduction loss in high-frequency switching applications. Its 0.48V typical VF at 2.5A/25°C and 0.42V at 2.5A/125°C enable stable efficiency across automotive temperature ranges.
Thermal performance is defined by RθJL = 17°C/W and RθJA = 78°C/W on a 5mm × 5mm Cu pad, supporting continuous 5A operation up to 150°C junction temperature with appropriate PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in 12V–24V automotive DC/DC outputs. |
| IF | 5 A - Continuous forward current rating; supports mid-power SMPS outputs without derating below 100°C ambient. |
| IFSM | 110 A - Peak surge current (8.3ms half-sine); withstands inrush and transient overloads in adapter and lighting circuits. |
| VF @ 5A/25°C | 0.58 V max - Low conduction loss reduces heat generation and improves system efficiency vs. standard PN diodes. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments with minimal thermal margin loss. |
| CJ | 256 pF @ 1MHz/4V - Low junction capacitance minimizes switching losses and EMI in >100kHz converters. |
| RθJL | 17 °C/W - Efficient heat transfer to PCB leads enables compact thermal design without external heatsinking. |
Pinout & Package
Package: Thin SMA (Surface Mount Axial) - ultra-thin profile (max height 2.3 mm), matte tin-plated leads, polarity indicated by cathode band, JEDEC-compliant moisture level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side (e.g., switch node); low-resistance metal interface minimizes conduction loss. |
| Cathode | Forward current exit / reverse voltage blocking terminal | Connected to output/load side; cathode band marking ensures correct orientation during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive power electronics per stress test requirements including HTGB, TC, HTRB, and UHAST - enables use in engine control and ADAS modules. |
| Low VF at high temperature | 0.53V max @ 5A/125°C - maintains efficiency during thermal transients, reducing need for oversized thermal pads or airflow. |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement before reflow - simplifies SMT line logistics and eliminates yield risk from moisture-induced popcorning. |
| High IFSM/IF ratio (22×) | 110A surge capability relative to 5A DC rating - accommodates repeated cold-start surges in vehicle battery systems without degradation. |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Step-down conversion from 12V/24V battery rail to 3.3V/5V for infotainment and body control modules. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck topology. Use Value: 0.58V max VF at 5A reduces conduction loss by ~40% vs. comparable PN diodes, lowering thermal load and enabling smaller heatsinks. | Use Scenario: Secondary-side rectification in open-frame 50–100W industrial SMPS for PLCs and HMIs. IC Role / Device Role / Timing Role: High-frequency freewheeling diode in flyback or forward converter. Use Value: 256pF junction capacitance limits switching loss and EMI generation at 200–500kHz operation, easing EMC filter design. |
| LED Lighting Driver | Laptop/Tablet AC Adapter |
Use Scenario: Constant-current rectification in isolated LED drivers for commercial lighting fixtures. IC Role / Device Role / Timing Role: Output rectifier handling pulsed 5A loads with high thermal cycling. Use Value: 150°C max junction temperature and 17°C/W RθJL support reliable operation under sealed fixture conditions without active cooling. | Use Scenario: Secondary-side rectification in compact 65W GaN-based USB-C adapters. IC Role / Device Role / Timing Role: Low-loss freewheeling path during high-frequency (≥150kHz) switching cycles. Use Value: AEC-Q101 qualification and level-1 moisture sensitivity ensure robustness through multiple reflow cycles and long-term field reliability. |
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-50SQ040 | Same 40V VRRM, 5A IF, but SMA package (not Thin SMA); RθJA = 80°C/W vs. 78°C/W; VF = 0.59V max @ 5A/25°C. | Compatible in non-space-constrained layouts; slightly higher thermal resistance requires larger copper area for same power dissipation. | Select when standard SMA footprint is preferred and board space allows for marginally larger thermal pad. |
| ON Semiconductor SB540 | 40V VRRM, 5A IF, DO-214AA package; VF = 0.55V typ @ 5A/25°C; not AEC-Q101 qualified; RθJA = 85°C/W. | Suitable for consumer/commercial power supplies only; lacks automotive qualification and has higher thermal resistance. | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not required and thermal margin is available. |
Compared with VS-50SQ040 and SB540, the SS54ALH delivers superior thermal performance (RθJL = 17°C/W), AEC-Q101 qualification, and thinner profile - making it the preferred choice for space- and reliability-critical automotive and industrial DC/DC converters.
Availability
SS54ALH is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial SMPS, and LED lighting drivers requiring stable component supply, AEC-Q101 compliance, and high-volume tape-and-reel delivery.
Supply support for SS54ALH 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 SS54ALH belongs to TSC's AEC-Q101-qualified Thin SMA Schottky rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in automotive and harsh-environment applications.
FAQ
What is the maximum junction temperature rating for SS54ALH?
The SS54ALH has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official datasheet. This allows continuous operation in under-hood automotive environments and high-ambient industrial settings. Derating begins above 100°C ambient, and thermal design must account for RθJL = 17°C/W to maintain safe junction temperatures. The SS54ALH achieves this rating while maintaining low forward voltage stability up to 125°C.
Is SS54ALH suitable for automotive applications?
Yes, the SS54ALH is AEC-Q101 qualified, confirming its suitability for automotive power electronics including engine control units, ADAS modules, and body electronics. Its qualification covers high-temperature reverse bias, temperature cycling, and humidity testing. The SS54ALH also meets J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to reflow - a critical advantage for automotive manufacturing lines.
What is the forward voltage of SS54ALH at 5A and 125°C?
The SS54ALH exhibits a maximum forward voltage of 0.62V at 5A and 125°C, with a typical value of 0.53V under those conditions. This low, thermally stable VF ensures consistent efficiency across wide temperature ranges - a key advantage over standard PN diodes whose VF increases with temperature. The SS54ALH datasheet specifies these values under pulse test conditions (PW = 0.3ms), reflecting real-world switching behavior.
What package type does SS54ALH use, and what are its key mechanical features?
The SS54ALH uses the Thin SMA package - a surface-mount axial outline with reduced height (max 2.3 mm) versus standard SMA. Key features include matte tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 molding compound, cathode band polarity marking, and JESD201 Class 2 whisker resistance. The SS54ALH's Thin SMA footprint enables denser PCB layouts in space-constrained automotive modules.
How does SS54ALH compare to SS56ALH in terms of electrical performance?
The SS54ALH and SS56ALH share identical current ratings (5A IF, 110A IFSM) and thermal specs (RθJL = 17°C/W), but differ in reverse voltage rating (40V vs. 60V) and forward voltage: SS54ALH has lower VF (0.58V max @ 5A/25°C) than SS56ALH (0.70V max). The SS54ALH is optimized for 12V–24V systems where lower conduction loss is prioritized over higher blocking voltage.
SS54ALH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 650 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- 256pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS54ALH FAQ
1.How can I place an order for SS54ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS54ALH 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 SS54ALH reliable?
The price and inventory of SS54ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS54ALH is usually 5 days.
3.What payment methods are accepted for SS54ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS54ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS54ALH?
SS54ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS54ALH 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 SS54ALH?
For technical support, including SS54ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS54ALH requirements.
6.How does Aetrix verify that SS54ALH is sourced from the original manufacturer or authorized distributors?
All SS54ALH 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 SS54ALH meets industry standards.
7.What is the process for return or replacement of SS54ALH?
All SS54ALH units undergo pre-shipment inspection (PSI). If there is an issue with SS54ALH, 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 SS54ALH part is unused and in its original packaging.
Return procedure for SS54ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SS54ALH 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…
