Taiwan Semiconductor Corporation 1.5KE56A R0G

Overview

1.5KE56A R0G from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for high-energy surge protection in automotive and industrial power rails. It features a nominal breakdown voltage of 56 V, clamping voltage of 77.0 V at 20 A peak impulse current, working stand-off voltage of 47.8 V, and junction temperature range of −55 °C to +175 °C - deployed in DC power input stages of automotive ECUs.

For engineers reviewing the 1.5KE56A R0G datasheet, 1.5KE56A R0G pinout, 1.5KE56A R0G application, or 1.5KE56A R0G equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-201 mechanical compatibility, and AEC-Q101 qualification status (R0G suffix indicates standard grade, not AEC-Q101).

Technical Context

This unidirectional TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (53.2–58.8 V at 1 mA), it avalanches into low-impedance conduction to divert surge energy away from downstream circuitry. Its fast response time (<1.0 ps from 0 V to V_BR) ensures protection before sensitive ICs experience overvoltage stress.

Designed for 10/1000 μs waveform surges up to 1500 W, it sustains peak forward surge current of 200 A (8.3 ms half-sine) and exhibits low dynamic impedance and typical reverse leakage <1 μA above 10 V. Thermal derating applies above 25 °C ambient per Fig.2, with maximum junction temperature rated at +175 °C.

Key Specifications

Pinout & Package

DO-201 package: axial-leaded, cylindrical epoxy body with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002; weight ≈ 0.090 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ58A, 1.5KE56A R0G delivers 2.5× higher surge power (1500 W vs. 600 W) and tighter clamping (77.0 V vs. 93.6 V), making it preferable for harsh automotive load-dump scenarios; versus 1N6289A, it is functionally identical - differing only in branding convention, not performance or reliability.

Availability

1.5KE56A R0G is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC power inputs, LED driver protection, telecom power feeding interfaces, and DC power distribution systems requiring stable component supply across extended temperature ranges and high-reliability surge immunity.

Supply support for 1.5KE56A R0G 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 management, protection, and signal conditioning devices since 1979.

The 1.5KE series was developed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing robustness under ISO 7637-2 and AEC-Q101-compliant operation - with 1.5KE56A R0G targeting 48 V and 24 V battery rail protection.

FAQ

What is the clamping voltage of the 1.5KE56A R0G under standard surge conditions?

The 1.5KE56A R0G has a maximum clamping voltage (V_C) of 77.0 V at 20 A peak impulse current (I_PP) under the 10/1000 μs double-exponential surge waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings. The 1.5KE56A R0G maintains this clamping performance across its full operating temperature range.

Is the 1.5KE56A R0G AEC-Q101 qualified?

No, the 1.5KE56A R0G is not AEC-Q101 qualified. The "R0G" suffix denotes standard commercial/industrial grade packaging (tape-and-reel, green compound). For AEC-Q101 qualification, the correct part is 1.5KE56AH - which carries the "H" suffix per Taiwan Semiconductor's ordering code table. Both share identical electrical specifications, but only the "H" variant undergoes automotive-grade stress testing including temperature cycling, humidity bias, and accelerated life testing.

What does the "A" in 1.5KE56A R0G signify?

The "A" in 1.5KE56A R0G indicates the tighter breakdown voltage tolerance variant: 53.2–58.8 V (±5% around 56 V nominal), versus the base 1.5KE56 (50.4–61.6 V, ±10%). This improved tolerance ensures more consistent clamping behavior across production lots and simplifies margin analysis in safety-critical designs. The "A" designation is defined in Taiwan Semiconductor's Electrical Specifications table and applies uniformly across the 1.5KE series.

Can the 1.5KE56A R0G be used in bidirectional configurations?

No, the 1.5KE56A R0G is strictly unidirectional. Its cathode band marking and electrical specifications (e.g., forward voltage of 3.5 V at 50 A) confirm single-polarity operation. For bidirectional protection at 56 V, Taiwan Semiconductor specifies the 1.5KE56CA variant - which uses center-tap construction and symmetric breakdown in both directions. Using 1.5KE56A R0G in bidirectional circuits risks forward conduction and failure during negative transients.

What is the thermal derating behavior of the 1.5KE56A R0G above 25°C ambient?

The 1.5KE56A R0G follows linear thermal derating per Taiwan Semiconductor's Fig.2: peak pulse power (P_PK) decreases from 1500 W at 25°C to zero at 175°C junction temperature. At 75°C ambient, P_PK is reduced to approximately 1125 W (75% of rated value); at 125°C, it drops to ~750 W. Derating assumes no heatsink - mounting on a 16 mm × 16 mm copper pad improves thermal resistance but does not eliminate the need for ambient-aware design margins. The 1.5KE56A R0G datasheet provides exact derating curves in Version O2104, page 5.