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Taiwan Semiconductor Corporation SS24ALH
- Part No.:
- SS24ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SS24ALH.pdf
- Description:
- 2A, 40V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:9,203
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Product details
Overview
SS24ALH from Taiwan Semiconductor is a 2A, 40V Schottky barrier surface-mount rectifier in Thin SMA package, featuring low forward voltage (0.46 V max at 2A/25°C), high surge capability (50 A IFSM), AEC-Q101 qualification, and 150°C maximum junction temperature. It serves as a primary output rectifier in compact DC/DC converters and automotive-grade power adapters.
For engineers reviewing the SS24ALH datasheet, SS24ALH pinout, SS24ALH application, or SS24ALH equivalent, key selection criteria include its 40V VRRM rating, 0.40 V typical VF at 1A/25°C, thermal resistance (RθJL = 21°C/W), moisture sensitivity level 1 compliance, and suitability for high-efficiency, space-constrained SMPS designs.
Technical Context
The SS24ALH implements a single-die Schottky junction optimized for low conduction loss and fast switching in unidirectional DC rectification. Its design targets continuous forward current up to 2A with minimal thermal rise on standard PCB copper pads (5 mm × 5 mm), supported by RθJA = 78°C/W and RθJC = 20°C/W.
It operates across -55°C to +150°C junction temperature range, maintains <200 µA reverse leakage at 40V/25°C, and exhibits 124 pF junction capacitance at 1 MHz/4V - enabling stable performance in high-frequency switching topologies up to several hundred kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; defines safe operating limit in DC/DC flyback or buck output stage |
| IF | 2 A - Continuous forward current rating; supports sustained load delivery without derating below 125°C ambient on standard layout |
| VF (max) | 0.57 V at 2A/25°C - Low conduction loss enables >92% efficiency in 5–12 V output converters |
| IFSM | 50 A (8.3 ms) - Withstands transient inrush during cold-start or short-circuit recovery |
| IR (max) | 200 µA at 40V/25°C - Minimizes standby power loss in always-on adapter applications |
| RθJL | 21 °C/W - Enables direct thermal coupling to PCB copper, simplifying thermal design vs. TO-220 alternatives |
| Junction temp | -55°C to +150°C - Supports under-hood automotive and industrial environments without external heatsinking |
Pinout & Package
Package: Thin SMA (Surface Mount Assembly), JEDEC DO-214AC compliant; molded UL 94V-0 compound; matte tin-plated leads; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction | Connected to switch node or transformer secondary; must handle peak current and EMI filtering |
| Cathode | Output terminal for forward conduction | Connected to output capacitor and load; polarity marking ensures correct PCB placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics including infotainment and body control modules |
| Moisture sensitivity level 1 | No baking required prior to reflow; compatible with standard SMT assembly lines |
| Low VF at high temperature | 0.40 V typ at 2A/125°C - maintains efficiency under thermal stress in enclosed enclosures |
| High IFSM (50 A) | Survives 8.3 ms half-sine surges common in AC line drop or load dump events |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive DC/DC Converters | USB-C Power Adapters |
|---|---|
Use Scenario: Step-down conversion from 12 V battery to 3.3 V/5 V rails in ADAS camera modules. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck converter. Use Value: Low VF reduces heat generation in sealed housings; AEC-Q101 ensures reliability over 15-year vehicle lifetime. | Use Scenario: Secondary-side rectification in compact 30 W USB PD wall adapters. IC Role / Device Role / Timing Role: Unidirectional current path after high-frequency transformer. Use Value: Thin SMA footprint saves board area; 0.46 V max VF improves light-load efficiency meeting DOE VI/ERP Tier 2 standards. |
| LED Driver Supplies | Industrial IoT Sensor Nodes |
Use Scenario: Constant-current LED string supply in smart lighting fixtures with dimming interface. IC Role / Device Role / Timing Role: Freewheeling diode in buck-based constant-current regulator. Use Value: Fast recovery (<10 ns) prevents cross-conduction losses; 150°C TJ rating supports operation near hot LEDs. | Use Scenario: Power conditioning for battery-backed wireless sensor nodes in factory automation. IC Role / Device Role / Timing Role: Reverse-polarity protection and rectification in dual-input (battery + USB) power management. Use Value: 200 µA IR at 25°C minimizes quiescent drain; MS level 1 eliminates process delays in high-volume SMT production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB240-E3/52 | 2A, 40V, DO-214AA package; VF = 0.55 V max at 2A/25°C; RθJA ≈ 90°C/W | Higher thermal resistance requires larger copper area; not AEC-Q101 qualified | Preferred where cost is critical and automotive qualification is unnecessary |
| SS24HE3_A/H | 2A, 40V, SMA package; VF = 0.52 V max at 2A/25°C; AEC-Q101 qualified; RθJL = 25°C/W | Slightly higher VF and thermal resistance than SS24ALH; identical footprint | Drop-in alternative when SS24ALH is unavailable; verify layout thermal margin |
Compared with SB240-E3/52 and SS24HE3_A/H, the SS24ALH delivers lower forward voltage and superior thermal performance (RθJL = 21°C/W), making it optimal for thermally constrained automotive and high-density adapter designs where efficiency and reliability are prioritized over lowest unit cost.
Availability
SS24ALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, USB-C power adapters, and industrial LED drivers requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SS24ALH 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 SS24ALH belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-reliability, high-efficiency power conversion in space- and thermal-constrained applications.
FAQ
What is the maximum junction temperature rating for SS24ALH?
The SS24ALH has a maximum junction temperature (TJ MAX) of +150°C, validated per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments and enclosed power supplies without forced air cooling. Derating begins above 125°C ambient, and the device maintains full 2A current capability up to 100°C ambient on a standard 5 mm × 5 mm Cu pad. The SS24ALH datasheet specifies TJ limits across the full -55°C to +150°C range.
Is SS24ALH suitable for automotive applications?
Yes, the SS24ALH is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, infotainment systems, and ADAS power supplies. Its construction meets JESD201 Class 2 whisker resistance, moisture sensitivity level 1, and halogen-free requirements per IEC 61249-2-21. The SS24ALH's 150°C TJ rating and robust surge capability (50 A IFSM) align with automotive transient and thermal demands.
What is the forward voltage of SS24ALH at 2A and 125°C?
The SS24ALH exhibits a typical forward voltage of 0.40 V and a maximum of 0.56 V at 2A and 125°C junction temperature. This low, temperature-stable VF enables high efficiency in high-ambient environments such as LED drivers or industrial power supplies. The SS24ALH's VF decreases with rising temperature - a characteristic of Schottky diodes - improving thermal stability versus PN junction rectifiers.
Does SS24ALH have a defined pinout or polarity marking?
Yes, the SS24ALH uses a two-terminal Thin SMA package with unambiguous polarity: the cathode is marked by a visible band on the device body. The anode is the unmarked end. This marking aligns with JEDEC DO-214AC standards and ensures correct orientation during automated placement. The SS24ALH's pinout is strictly anode–cathode; no internal circuitry or additional terminals exist.
What packaging and reel quantity is available for SS24ALH?
The SS24ALH is supplied in Tape & Reel format with 14,000 units per reel, compatible with standard SMT pick-and-place equipment. The Thin SMA package dimensions and sprocket hole pitch conform to EIA-481 standards. Each reel includes date code (YW), factory code (F), and marking code "24ALH" laser-etched on the device body. The SS24ALH's moisture sensitivity level 1 eliminates pre-bake requirements before reflow soldering.
SS24ALH 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):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 570 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- 124pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS24ALH FAQ
1.How can I place an order for SS24ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS24ALH 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 SS24ALH reliable?
The price and inventory of SS24ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS24ALH is usually 5 days.
3.What payment methods are accepted for SS24ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS24ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS24ALH?
SS24ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS24ALH 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 SS24ALH?
For technical support, including SS24ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS24ALH requirements.
6.How does Aetrix verify that SS24ALH is sourced from the original manufacturer or authorized distributors?
All SS24ALH 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 SS24ALH meets industry standards.
7.What is the process for return or replacement of SS24ALH?
All SS24ALH units undergo pre-shipment inspection (PSI). If there is an issue with SS24ALH, 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 SS24ALH part is unused and in its original packaging.
Return procedure for SS24ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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