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Taiwan Semiconductor Corporation ES1ALH
- Part No.:
- ES1ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
ES1ALH.pdf
- Description:
- 35NS, 1A, 50V, SUPER FAST RECOVE
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
ES1ALH from Taiwan Semiconductor is a 1A, 50V super fast surface-mount rectifier diode in Sub SMA package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 1 A, and AEC-Q101 qualification for automotive use in DC-DC converters and freewheeling circuits.
For engineers reviewing the ES1ALH datasheet, ES1ALH pinout, ES1ALH application, or ES1ALH equivalent, key selection criteria include repetitive peak reverse voltage (50 V), junction-to-lead thermal resistance (35 °C/W), moisture sensitivity level (J-STD-020 Level 1), and cathode-band polarity marking for reliable automated placement and high-efficiency power conversion.
Technical Context
The ES1ALH is a single-die, glass-passivated silicon rectifier optimized for high-speed switching with low forward conduction loss and minimal reverse recovery charge. Its 35 ns trr and 10 pF junction capacitance support efficient operation in 100–500 kHz DC-DC topologies.
Designed for automotive-grade reliability, it meets AEC-Q101 stress tests and operates across –55°C to +150°C junction temperature range, with matte tin-plated leads compliant to J-STD-002 solderability and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in snubber and flyback clamp circuits |
| IF | 1 A - Continuous average forward current; supports compact 1A DC-DC output rectification without heatsinking |
| trr | 35 ns - Reverse recovery time; enables high-frequency switching with reduced switching loss and EMI |
| VF @ 1A, 25°C | 0.95 V - Forward voltage drop; contributes to <0.95 W conduction loss at full load |
| RθJL | 35 °C/W - Junction-to-lead thermal resistance; allows direct PCB copper pad heat sinking for thermal management |
| IR @ 50 V, 25°C | 5 µA - Max reverse leakage; ensures low standby power loss in battery-sensitive automotive lighting |
| CJ @ 1 MHz, 4 V | 10 pF - Junction capacitance; minimizes capacitive coupling noise in high-dv/dt freewheeling paths |
Pinout & Package
Package: Sub SMA - Low-profile, surface-mount plastic package with cathode band polarity marking, UL 94V-0 rated molding compound, and matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to lower-potential side (e.g., switch node in buck converter); requires adequate copper area for thermal dissipation |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; connects to output rail or ground return; critical for correct orientation in automated placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood environments including temperature cycling, humidity bias, and mechanical shock |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| Sub SMA package | 0.019 g weight and low profile enable space-constrained layouts in LED drivers and ECUs |
| J-STD-020 Level 1 MSL | Unlimited floor life before reflow; eliminates bake requirements and simplifies SMT line logistics |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally regulated automotive supply chains |
Applications
| Automotive DC-DC Converters | LED Headlight Drivers |
|---|---|
Use Scenario: Step-down conversion in 12 V–5 V/3.3 V auxiliary rails for infotainment and ADAS modules. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck topology. Use Value: 35 ns trr and 0.95 V VF reduce switching and conduction losses, improving efficiency >92% at 1 A load. | Use Scenario: Constant-current regulation and overvoltage protection in adaptive front-lighting systems. IC Role / Device Role / Timing Role: Freewheeling diode across inductive LED driver MOSFETs. Use Value: Low IR (5 µA) prevents battery drain during vehicle sleep mode; AEC-Q101 ensures 15-year field reliability. |
| Snubber Networks | Industrial Power Supplies |
Use Scenario: RCD clamp circuit across flyback transformer primary winding. IC Role / Device Role / Timing Role: Fast-recovery diode capturing leakage energy during MOSFET turn-off. Use Value: 35 ns trr limits voltage overshoot and reduces snubber resistor power dissipation by ~30% vs. standard rectifiers. | Use Scenario: Secondary-side rectification in isolated 24 V input industrial SMPS for PLC I/O modules. IC Role / Device Role / Timing Role: Single-diode output rectifier in low-power offline flyback design. Use Value: Sub SMA footprint and J-STD-020 Level 1 enable direct replacement of legacy SMA parts without requalification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semi MUR105 | Same Sub SMA package; VF = 0.93 V (typ), trr = 30 ns, VRRM = 50 V, but not AEC-Q101 qualified | Suitable for industrial/commercial DC-DC; lacks automotive qualification and JESD201 whisker testing | Select when AEC-Q101 is not required and slightly faster trr is prioritized |
| Vishay ES1B | VRRM = 100 V; VF = 0.95 V (typ); trr = 35 ns; same Sub SMA; AEC-Q101 qualified; higher VR margin | Acceptable where 100 V derating is needed (e.g., 24 V systems with transients), but over-spec for pure 12 V automotive rails | Choose if system-level transient immunity requires ≥100 V VRRM, accepting minor cost premium |
Compared with MUR105 and ES1B, the ES1ALH uniquely balances AEC-Q101 compliance, 50 V optimization for 12 V automotive systems, and J-STD-020 Level 1 handling-making it the most cost-effective and qualification-ready choice for volume automotive rectification where exact 50 V rating is specified.
Availability
ES1ALH is available at Aetrix Electronics and suitable for automotive lighting, DC-DC converters, and snubber networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for ES1ALH 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 ES1ALH belongs to TSC's AEC-Q101-qualified Super Fast Rectifier family, engineered specifically for high-efficiency, high-reliability rectification in automotive power conversion and lighting control systems.
FAQ
What is the maximum junction temperature rating for ES1ALH?
The ES1ALH has a maximum junction temperature (TJ) of +150°C, verified per AEC-Q101 thermal stress testing. This rating enables reliable operation in under-hood automotive environments and high-ambient industrial power supplies. The device's RθJL of 35 °C/W allows effective heat transfer to the PCB, and its –55°C to +150°C operating range ensures functionality across cold-cranking and hot-soak conditions. Always reference the forward current derating curve in the ES1ALH datasheet for ambient temperature derating guidance.
Is ES1ALH pin-compatible with other parts in the ES1xLH series?
No-ES1ALH shares the Sub SMA package and pinout (anode/cathode) with all ES1xLH variants (e.g., ES1BLH, ES1JLH), but voltage ratings differ: ES1ALH is rated for 50 V VRRM, while others range up to 600 V. Mechanical compatibility does not imply electrical interchangeability. Substituting ES1ALH for a higher-voltage variant risks catastrophic failure under reverse bias. Always match the exact VRRM requirement; ES1ALH is only suitable where 50 V blocking is sufficient and specified.
Does ES1ALH require special handling during PCB assembly?
No special handling is required: ES1ALH is rated J-STD-020 Moisture Sensitivity Level 1, meaning it has unlimited floor life and can be placed directly into reflow without baking. Its matte tin-plated leads meet J-STD-002 solderability standards, and the Sub SMA package supports standard lead-free reflow profiles (peak 260°C). Polarity is clearly marked with a cathode band, enabling error-proof automated placement. No pre-bake, dry pack, or humidity-controlled storage is needed.
What is the reverse recovery time (trr) specification for ES1ALH, and how is it measured?
The ES1ALH reverse recovery time (trr) is 35 ns maximum, measured under conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, per the test circuit in Figure 6 of the ES1ALH datasheet. This value reflects the time required for minority carriers to clear after forward conduction, directly impacting switching loss and EMI in high-frequency DC-DC converters. The 35 ns trr is typical for super-fast rectifiers and is validated across temperature and process corners.
Can ES1ALH be used in place of a standard FR107 diode?
ES1ALH is not a direct replacement for FR107: FR107 is a 1 A, 1000 V fast recovery diode in DO-41 package with trr ≈ 500 ns and VF ≈ 1.3 V. ES1ALH offers superior speed (35 ns vs. 500 ns) and lower VF (0.95 V), but its 50 V VRRM is far below FR107's 1000 V rating. Using ES1ALH in a 1000 V application would cause immediate breakdown. It is only suitable where both voltage rating (≤50 V) and high-speed performance are required-e.g., low-voltage automotive DC-DC, not AC line rectification.
ES1ALH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 10pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
ES1ALH FAQ
1.How can I place an order for ES1ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for ES1ALH 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 ES1ALH reliable?
The price and inventory of ES1ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ES1ALH is usually 5 days.
3.What payment methods are accepted for ES1ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ES1ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ES1ALH?
ES1ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ES1ALH 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 ES1ALH?
For technical support, including ES1ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ES1ALH requirements.
6.How does Aetrix verify that ES1ALH is sourced from the original manufacturer or authorized distributors?
All ES1ALH 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 ES1ALH meets industry standards.
7.What is the process for return or replacement of ES1ALH?
All ES1ALH units undergo pre-shipment inspection (PSI). If there is an issue with ES1ALH, 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 ES1ALH part is unused and in its original packaging.
Return procedure for ES1ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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