My Inquiry
My Account
Taiwan Semiconductor Corporation HS1ALH
- Part No.:
- HS1ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
HS1ALH.pdf
- Description:
- 50NS, 1A, 50V, HIGH EFFICIENT RE
- Quantity:
- Payment:
- Shipping:
Inventory:7,963
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
HS1ALH from Taiwan Semiconductor is a 1A, 50V surface-mount Schottky rectifier in Sub SMA package, featuring glass passivated junction, AEC-Q101 qualification, and 0.95V max forward voltage at 1A/25°C for low-loss DC-DC conversion in automotive lighting systems.
For engineers reviewing the HS1ALH datasheet, HS1ALH pinout, HS1ALH application, or HS1ALH equivalent, key selection criteria include its 50V VRRM rating, 30A IFSM surge capability, 100°C/W RθJA thermal resistance, J-STD-020 Level 1 moisture sensitivity, and cathode-band polarity marking for automated placement reliability.
Technical Context
This single-die, unidirectional silicon rectifier operates with a maximum junction temperature of 150°C and supports continuous forward current up to 1A at ambient temperatures ≤75°C per derating curve. Its glass-passivated chip junction ensures stable reverse leakage (≤5µA @ 25°C, ≤150µA @ 125°C) under rated VR.
The device uses a Sub SMA package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by a visible cathode band, and the compound meets UL 94V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in snubber/freewheeling circuits |
| IF | 1 A - Continuous average forward current rating at TA ≤75°C; determines usable current capacity in DC-DC output stages |
| IFSM | 30 A - Non-repetitive peak surge current (8.3ms half-sine); enables robustness against inductive turn-off transients |
| VF (max) | 0.95 V @ 1A, 25°C - Forward voltage drop directly impacts conduction loss and thermal rise in high-efficiency converters |
| IR (max) | 5 µA @ 25°C - Reverse leakage current; critical for low-power standby and precision voltage hold applications |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; used to calculate junction temperature rise under real PCB layout conditions |
| TJ max | 150 °C - Absolute maximum junction temperature; sets upper limit for thermal design margin in automotive under-hood environments |
Pinout & Package
Package: Sub SMA - Low-profile, surface-mount package with cathode-indicating band, matte tin-plated leads, UL 94V-0 molding compound, and 0.019g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in buck converter); requires thermal relief pad for soldering reliability |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; ties to output rail or ground return; polarity must match PCB silkscreen to prevent assembly failure |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for under-hood lighting modules |
| Glass passivated junction | Enhanced moisture and contamination resistance over epoxy-passivated alternatives - improves long-term stability in humid environments |
| Level 1 moisture sensitivity | No bake preconditioning required before reflow - reduces manufacturing cost and avoids thermal stress on sensitive assemblies |
| Low profile Sub SMA | Height ≤1.1mm - enables compact layouts in space-constrained LED driver PCBs and automotive control units |
| Halogen-free construction | Complies with IEC 61249-2-21 - satisfies RoHS and ELV requirements for global vehicle OEM supply chains |
Applications
| Automotive LED Lighting | DC-DC Converter Output Rectification |
|---|---|
Use Scenario: High-brightness LED headlamp driver with synchronous buck topology requiring efficient freewheeling path. IC Role / Device Role / Timing Role: Freewheeling diode providing low-VF conduction during high-side switch off-time. Use Value: 0.95V VF minimizes power loss and thermal load in thermally constrained headlamp housings. | Use Scenario: 12V-to-5V step-down converter powering infotainment microcontrollers in passenger vehicles. IC Role / Device Role / Timing Role: Output rectifier handling continuous 1A load with minimal conduction loss. Use Value: AEC-Q101 qualification ensures operation across -40°C to +125°C ambient without derating. |
| Snubber Network Protection | Automotive Body Control Module (BCM) |
Use Scenario: RC snubber across relay contacts or MOSFET drains in HVAC blower motor control. IC Role / Device Role / Timing Role: Voltage clamping element absorbing inductive kick energy during switching transitions. Use Value: 50V VRRM and 30A IFSM withstand repeated 24V system transients without degradation. | Use Scenario: Power management in door module controlling window lift, mirror fold, and interior lighting. IC Role / Device Role / Timing Role: Reverse polarity protection and load dump suppression diode. Use Value: Glass passivation and JESD 201 Class 2 whisker resistance ensure 15-year field reliability in vibration-prone locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB150-E3/54 (Vishay) | Same Sub SMA package, 1A/50V rating, but VF = 0.93V typ (vs. 0.95V max for HS1ALH); no AEC-Q101 qualification | Qualified for industrial/commercial use only; not approved for automotive safety-critical subsystems | Select when AEC-Q101 is not mandated and tighter VF tolerance is prioritized |
| SS14 (ON Semiconductor) | 1A/40V rating (lower VRRM), VF = 0.55V typ, same Sub SMA footprint; AEC-Q101 qualified | Insufficient reverse voltage margin for 24V automotive systems with load dump spikes | Choose only in 12V-only designs where 40V VRRM suffices and ultra-low VF is essential |
Compared with SB150-E3/54 and SS14, HS1ALH uniquely combines AEC-Q101 compliance, 50V VRRM margin for 24V automotive systems, and verified 0.95V max VF performance - making it the preferred choice for production-grade automotive lighting and BCM rectification where qualification and voltage headroom are non-negotiable.
Availability
HS1ALH is available at Aetrix Electronics and suitable for automotive LED lighting, DC-DC converter output rectification, and snubber network protection requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for HS1ALH 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 high-reliability rectifiers, TVS diodes, and MOSFETs for automotive and industrial markets.
The HS1ALH belongs to TSC's HS1xLH high-efficiency rectifier family, engineered specifically for AEC-Q101-compliant automotive power conversion where low VF, robust surge handling, and moisture-resistant packaging are mandatory.
FAQ
What is the maximum junction temperature rating for HS1ALH?
The HS1ALH 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 when combined with proper PCB copper area and airflow. Thermal design must ensure actual TJ stays below this limit using the specified 100°C/W RθJA value and measured ambient conditions. The HS1ALH datasheet provides derating curves to guide safe current limits at elevated temperatures.
Is HS1ALH suitable for 24V automotive systems with load dump protection?
Yes, HS1ALH is suitable for 24V automotive systems due to its 50V VRRM rating, which exceeds typical ISO 7637-2 load dump spike thresholds (up to ~40V). Its 30A IFSM surge rating handles transient energy, and AEC-Q101 qualification confirms robustness against temperature cycling and humidity. However, for systems expecting >50V transients, higher-voltage variants like HS1BLH (100V) should be evaluated. The HS1ALH remains optimal for LED lighting and BCM applications within standard 24V nominal ranges.
Does HS1ALH have a cathode band marking, and how is polarity identified?
Yes, HS1ALH uses a visible cathode band marking on the Sub SMA package body to indicate polarity. The banded end corresponds to the cathode terminal, while the unmarked end is the anode. This marking aligns with JEDEC standards and is essential for correct orientation during automated placement and manual inspection. The HS1ALH datasheet specifies that incorrect polarity results in immediate open-circuit behavior and potential system malfunction - verifying band alignment against PCB silkscreen is a critical assembly checkpoint.
What is the moisture sensitivity level (MSL) of HS1ALH, and does it require baking before reflow?
The HS1ALH is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking prior to reflow soldering. This eliminates pre-reflow conditioning steps, reducing manufacturing cycle time and avoiding thermal stress on the glass-passivated die. The HS1ALH's Level 1 classification is confirmed in the official Taiwan Semiconductor datasheet revision A2103 and applies across all production lots shipped in tape-and-reel packaging.
How does the forward voltage (VF) of HS1ALH compare to other 1A rectifiers in Sub SMA packages?
The HS1ALH specifies a maximum forward voltage of 0.95V at 1A and 25°C, measured under standardized pulse conditions (PW = 0.3ms). This is competitive with industry-standard Schottky rectifiers such as SB150 (0.93V typ) and slightly higher than ultra-low-VF devices like SS14 (0.55V typ), but HS1ALH uniquely delivers this VF while maintaining AEC-Q101 qualification and 50V VRRM. The HS1ALH balances efficiency, voltage margin, and automotive compliance - making it distinct from commercial-grade alternatives.
HS1ALH 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):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 20pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
HS1ALH FAQ
1.How can I place an order for HS1ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for HS1ALH 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 HS1ALH reliable?
The price and inventory of HS1ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HS1ALH is usually 5 days.
3.What payment methods are accepted for HS1ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HS1ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HS1ALH?
HS1ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HS1ALH 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 HS1ALH?
For technical support, including HS1ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HS1ALH requirements.
6.How does Aetrix verify that HS1ALH is sourced from the original manufacturer or authorized distributors?
All HS1ALH 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 HS1ALH meets industry standards.
7.What is the process for return or replacement of HS1ALH?
All HS1ALH units undergo pre-shipment inspection (PSI). If there is an issue with HS1ALH, 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 HS1ALH part is unused and in its original packaging.
Return procedure for HS1ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HS1ALH 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…
