Taiwan Semiconductor Corporation RS1MAL

Overview

RS1MAL from Taiwan Semiconductor is a 1A, 1000V fast recovery surface-mount rectifier in a Thin SMA package, featuring 500 ns reverse recovery time, 1.04 V forward voltage at 1.0 A and 25°C, and 30 A surge current capability. It serves as the high-voltage member of the RS1xAL series for DC-DC converters and switching inverters requiring robust reverse blocking and thermal resilience up to 175°C junction temperature.

For engineers reviewing the RS1MAL datasheet, RS1MAL pinout, RS1MAL application, or RS1MAL equivalent, key selection criteria include its 1000 V repetitive peak reverse voltage (VRRM), 19 °C/W junction-to-lead thermal resistance, low-profile Thin SMA footprint, and verified performance under 125°C operating conditions with <1.11 V VF max.

Technical Context

The RS1MAL is a single-die, glass-passivated silicon PN junction rectifier optimized for fast switching in high-frequency power conversion. Its 500 ns trr and 7 pF junction capacitance support efficient operation in SMPS topologies above 50 kHz while maintaining low conduction loss via controlled doping and metallization.

Designed for surface-mount assembly on standard PCBs with 5 mm × 5 mm copper pads, the device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. Polarity is unambiguously indicated by a cathode band, and terminals are matte tin-plated for reliable solderability per J-STD-002.

Key Specifications

Pinout & Package

Package: Thin SMA (JEDEC DO-221AC variation), low-profile surface-mount case with matte tin-plated leads and cathode band polarity marking. Dimensions: 4.40 × 2.70 × 1.20 mm (L × W × H), weight ≈ 0.029 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast recovery rectifier applications.

Compared with STTH1R06 and ES1J, the RS1MAL uniquely delivers 1000 V VRRM in a low-profile Thin SMA package with balanced VF/trr trade-off-making it optimal for next-generation 800 V-class industrial and EV auxiliary power supplies where both voltage headroom and thermal density matter.

Availability

RS1MAL is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial SMPS requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for RS1MAL 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 power rectifiers, TVS diodes, MOSFETs, and bipolar transistors.

The RS1MAL belongs to TSC's RS1xAL fast recovery rectifier product line, engineered specifically for high-efficiency, high-voltage switching power supplies where thermal robustness, surface-mount reliability, and tight parametric consistency are critical.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) for RS1MAL?

The RS1MAL has a VRRM of 1000 V, confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version C2304). This rating defines the highest instantaneous reverse voltage the device can block repeatedly without breakdown, making RS1MAL suitable for 800 V DC bus applications with standard 25% design margin. Operation beyond this value risks irreversible avalanche failure.

Does RS1MAL have a specified reverse recovery time (trr), and under what test conditions?

Yes, RS1MAL has a maximum reverse recovery time (trr) of 500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the Electrical Specifications table. This value applies specifically to the RS1KAL and RS1MAL variants and reflects performance at 25°C ambient. The trr increases slightly at elevated junction temperatures but remains within fast-recovery classification.

What is the forward voltage (VF) of RS1MAL at 1.0 A and 25°C, and how does it change at 125°C?

At 1.0 A and 25°C, RS1MAL exhibits a typical forward voltage (VF) of 1.04 V and a maximum of 1.30 V. At 1.0 A and 125°C, VF drops to a typical 0.90 V with a maximum of 1.11 V. This negative temperature coefficient is inherent to silicon PN junctions and improves conduction efficiency at elevated operating temperatures, a key advantage in thermally constrained designs.

Is RS1MAL compatible with lead-free reflow soldering processes?

Yes, RS1MAL is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its Moisture Sensitivity Level is rated J-STD-020 Level 1-meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking. The package also complies with RoHS and halogen-free standards.

What thermal resistance values are specified for RS1MAL, and how are they measured?

RS1MAL specifies RθJL = 19 °C/W (junction-to-lead) and RθJA = 81 °C/W (junction-to-ambient), both measured on a 5 mm × 5 mm copper pad PCB per JEDEC standards. RθJL is the primary metric for thermal design, indicating that a 1.5 W power dissipation yields a 28.5°C temperature rise from lead to junction-enabling accurate thermal modeling without external heatsinks in many applications.