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Taiwan Semiconductor Corporation S1MALH
- Part No.:
- S1MALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
S1MALH.pdf
- Description:
- DIODE GEN PURP 1KV 1A THIN SMA
- Quantity:
- Payment:
- Shipping:
Inventory:53,530
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Product details
Overview
S1MALH from Taiwan Semiconductor is a 1000V, 1A standard surface-mount rectifier diode in a Thin SMA package, featuring glass-passivated junction, AEC-Q101 qualification, and 30A surge capability (8.3ms), used for freewheeling and snubber circuits in automotive DC/DC converters.
For engineers reviewing the S1MALH datasheet, S1MALH pinout, S1MALH application, or S1MALH equivalent, key selection factors include peak reverse voltage (1000V), forward voltage at 1A (≤1.10V @ 25°C), thermal resistance (RθJA = 82°C/W), AEC-Q101 compliance, and Thin SMA mechanical compatibility with automated placement.
Technical Context
The S1MALH is a single-die, unidirectional silicon rectifier optimized for high-voltage transient suppression and energy recovery in switching power stages. Its glass-passivated junction ensures stable leakage performance up to 125°C (IR ≤ 50 µA) and enables reliable operation in automotive under-hood environments.
Thermal design is supported by validated RθJL = 29°C/W and RθJC = 30°C/W values measured on a 5mm × 5mm Cu pad PCB, while its low-profile Thin SMA package (max height 1.1mm) maintains compatibility with space-constrained layouts and reflow profiles per J-STD-020 Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - Maximum repetitive reverse voltage; defines safe blocking capability in 800–1000V bus applications. |
| IF | 1 A - Continuous average forward current; supports steady-state conduction in 12–48V DC/DC output stages. |
| IFSM (8.3ms) | 30 A - Non-repetitive surge rating; handles inductive kickback in relay drivers or motor control freewheeling. |
| VF @ 1A, 25°C | ≤1.10 V - Forward drop determines conduction loss; contributes ~1.1W dissipation at full load. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| CJ | 8 pF @ 1MHz, 4V - Junction capacitance impacts high-frequency switching noise and snubber tuning. |
Pinout & Package
Package: Thin SMA (Surface Mount Assembly), low-profile plastic case with matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 rated molding compound, weight ≈ 0.029 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to lower-potential side of load or switch node; must handle 1A continuous and 30A surge. |
| Cathode (K) | Forward current exit / reverse voltage reference | Marked by band; connects to higher-potential rail or switching node; blocks up to 1000V reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Glass-passivated junction | Ensures stable IR ≤ 1 µA @ 25°C and ≤ 50 µA @ 125°C; prevents moisture-induced parameter drift. |
| Thin SMA package | Height ≤ 1.1 mm; compatible with automated pick-and-place and standard IR-reflow profiles (J-STD-020 Level 1). |
| Low RθJA | 82°C/W on 5mm × 5mm Cu pad; enables 1A operation without external heatsinking in ambient ≤ 70°C. |
Applications
| Automotive DC/DC Converters | Industrial Snubber Circuits |
|---|---|
Use Scenario: High-efficiency 12V-to-48V bidirectional DC/DC converter in 48V mild-hybrid vehicles. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck-boost stage, conducting during low-side switch off-time. Use Value: 1000V VRRM withstands voltage spikes from parasitic inductance; 30A IFSM absorbs transient energy without failure. | Use Scenario: RC snubber across IGBTs in motor drive inverters operating at 600–800V DC bus. IC Role / Device Role / Timing Role: Voltage-clamping diode that conducts during turn-off to limit dv/dt and suppress ringing. Use Value: Low CJ (8 pF) minimizes capacitive loading on gate driver; fast recovery enables effective high-frequency spike suppression. |
| Automotive LED Lighting Drivers | Power Supply Input Rectification |
Use Scenario: Constant-current LED driver for headlamp modules exposed to engine bay temperatures up to 125°C. IC Role / Device Role / Timing Role: Output rectifier in flyback or buck-derived topology, delivering regulated current to LED strings. Use Value: AEC-Q101 qualification and TJ max = +150°C ensure reliability over lifetime; low VF reduces thermal load in sealed housings. | Use Scenario: Secondary-side rectification in isolated AC/DC adapters for industrial control panels. IC Role / Device Role / Timing Role: Standard rectifier converting transformer secondary AC to DC before filtering and regulation. Use Value: Thin SMA footprint saves board space; RoHS/halogen-free compliance meets regional environmental mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06S | 600V VRRM, same IF/IFSM, TO-277 package (higher profile, different thermal path) | Limited to ≤600V systems; requires layout change due to larger footprint and leaded form factor | Select when 600V rating suffices and TO-277 mounting is preferred |
| ES1J-M3/84A | 600V VRRM, 1A/30A ratings, SMA package, but not AEC-Q101 qualified | Not suitable for automotive safety-critical or under-hood use; acceptable for commercial-grade power supplies | Select for cost-sensitive non-automotive applications where AEC-Q101 is not required |
Compared with STTH1R06S and ES1J-M3/84A, the S1MALH uniquely combines 1000V blocking, AEC-Q101 qualification, and Thin SMA packaging-enabling direct use in high-voltage automotive converters without derating or mechanical redesign.
Availability
S1MALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial snubber networks, and LED lighting drivers requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for S1MALH 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 automotive, industrial, and consumer markets since 1979.
The S1MALH belongs to TSC's S1xALH family of AEC-Q101-qualified surface-mount rectifiers, designed specifically for high-reliability automotive power conversion and transient protection where voltage robustness and thermal stability are critical.
FAQ
What is the maximum repetitive peak reverse voltage rating for S1MALH?
The S1MALH has a maximum repetitive peak reverse voltage (VRRM) of 1000 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). This rating defines the highest reverse-bias voltage the device can block continuously without breakdown, making it suitable for 800–1000V bus applications such as 48V automotive DC/DC stages and industrial snubbers.
Is S1MALH qualified for automotive applications?
Yes, the S1MALH is explicitly AEC-Q101 qualified per the manufacturer's documentation. This qualification includes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge-ensuring reliability in automotive under-hood environments. The S1MALH is recommended for automotive DC/DC converters, LED drivers, and other AEC-Q101–mandated systems.
What is the forward voltage drop of S1MALH at 1A and 25°C?
The forward voltage (VF) of the S1MALH is specified as a maximum of 1.10 V at IF = 1.0 A and TJ = 25°C, with a typical value of 0.96 V under the same conditions. This value is measured using a pulse test (PW = 0.3 ms) and directly impacts conduction losses-e.g., ~1.1 W dissipation at full rated current.
Does S1MALH have a glass-passivated junction?
Yes, the S1MALH features a glass-passivated chip junction, as stated in the FEATURES section of the official datasheet. This construction improves long-term reliability by preventing moisture ingress and stabilizing reverse leakage current-keeping IR ≤ 1 µA at 25°C and ≤ 50 µA at 125°C under rated reverse voltage.
What package type does S1MALH use, and what are its key mechanical attributes?
The S1MALH uses the Thin SMA package: a low-profile surface-mount outline with maximum height of 1.1 mm, matte tin-plated leads compliant with J-STD-002 solderability, polarity indicated by cathode band, and UL 94V-0 rated molding compound. Its weight is approximately 0.029 g, and it meets JESD201 Class 2 whisker resistance requirements.
S1MALH 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:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1000 V
- Capacitance @ Vr, F:
- 8pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
S1MALH FAQ
1.How can I place an order for S1MALH through Aetrix?
Please submit a Request for Quotation (RFQ) for S1MALH 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 S1MALH reliable?
The price and inventory of S1MALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1MALH is usually 5 days.
3.What payment methods are accepted for S1MALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1MALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1MALH?
S1MALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1MALH 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 S1MALH?
For technical support, including S1MALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1MALH requirements.
6.How does Aetrix verify that S1MALH is sourced from the original manufacturer or authorized distributors?
All S1MALH 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 S1MALH meets industry standards.
7.What is the process for return or replacement of S1MALH?
All S1MALH units undergo pre-shipment inspection (PSI). If there is an issue with S1MALH, 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 S1MALH part is unused and in its original packaging.
Return procedure for S1MALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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