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Vishay General Semiconductor - Diodes Division 1.5KE56A-E3/51
- Part No.:
- 1.5KE56A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE56A-E3/51.pdf
- Description:
- TVS DIODE 47.8VWM 77VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
1.5KE56A-E3/51 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails and signal lines. It features a 53.2 V minimum breakdown voltage (VBR), 47.8 V maximum standoff voltage (VWM), 77.0 V clamping voltage (VC) at 19.5 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across -55 °C to +175 °C junction temperature range - deployed in automotive power supply inputs and industrial sensor interface protection.
For engineers reviewing the 1.5KE56A-E3/51 datasheet, 1.5KE56A-E3/51 pinout, 1.5KE56A-E3/51 application, or 1.5KE56A-E3/51 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant packaging details, and direct alternative part comparisons for ESD and lightning transient suppression design validation.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its clamping action begins at VBR = 53.2–58.8 V (tested at 1 mA), holds VWM ≤ 47.8 V to avoid false triggering, and limits transient voltage to ≤77.0 V at 19.5 A IPPM under 10/1000 µs waveform.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15.4 °C/W, with power dissipation derated linearly above 25 °C ambient and lead temperature up to 75 °C. The device supports 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits VF = 5.0 V at 100 A per specification note (3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 53.2 V / 58.8 V - defines precise voltage threshold where avalanche conduction initiates reliably at 1 mA test current |
| VWM | 47.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; ensures no false triggering in 48 V systems |
| VC @ IPPM | 77.0 V at 19.5 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure level |
| PPPM | 1500 W - peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) |
| IFSM | 200 A - single half-sine surge current rating (8.3 ms); validates survivability against load dump events in automotive 12 V/24 V systems |
| TJ max. | +175 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments |
| Package | DO-201AD (Case Style 1.5KE) - axial-leaded, molded epoxy package rated UL 94 V-0; compatible with wave soldering (275 °C, 10 s) |
Pinout & Package
1.5KE56A-E3/51 is housed in a DO-201AD (Case Style 1.5KE) axial-leaded package with cathode indicated by a color band on one end. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side return path in unidirectional clamp configuration |
| Cathode (banded end) | Current exit point during reverse avalanche clamping | Connected to protected line (e.g., 48 V rail input); absorbs transient energy into ground reference |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500 W peak pulse power (10/1000 µs) | Validated for repeated surge events per IEC 61000-4-5; supports >1000 cycles at 0.01% duty cycle |
| Clamping voltage ≤77.0 V at 19.5 A | Provides margin below 80 V absolute maximum ratings of common 48 V-rated MOSFETs and controllers |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance; suitable for commercial-grade industrial and telecom applications |
| Operating TJ up to +175 °C | Enables placement near heat sources (e.g., power converters) without derating penalty in compact layouts |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients (ISO 16750-2 Pulse 5a) and alternator switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground; clamps within <1 ns to limit voltage excursion below IC damage threshold. Use Value: Withstands 200 A surge (8.3 ms) and clamps to 77.0 V, preserving downstream DC-DC converters and microcontrollers rated for 80 V absolute maximum. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules from ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point; shunts transients before reaching precision amplifier inputs. Use Value: 47.8 V VWM avoids interference with 24 V sensor supply; 77.0 V VC prevents latch-up in 3.3 V/5 V ADC front-ends. |
| Telecom DC Power Feeds | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) connected to outdoor Ethernet cables susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS on 48 V DC input rail; coordinates with secondary GDT or MOV for staged protection. Use Value: 1500 W PPPM handles multi-kV induced surges; UL 94 V-0 epoxy body meets flame-retardant requirements for enclosed telecom enclosures. |
Use Scenario: Preventing damage to USB-C PD controllers and charging ICs during hot-plug events or adapter fault conditions. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line; suppresses overshoot from poor-quality adapters or cable reflections. Use Value: 53.2–58.8 V VBR aligns with USB PD 3.0 48 V profile; 77.0 V clamping ensures safe margin below 100 V internal FET breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | DO-214AA package; lower PPPM = 600 W; VC = 93.6 V @ 6.4 A; smaller footprint but reduced surge capacity | Preferred for space-constrained PCBs where 600 W surge rating suffices (e.g., consumer USB ports) | Select SMBJ58A when board area is critical and system-level surge testing does not exceed IEC 61000-4-5 Level 3. |
| 1.5KE56CA | Bidirectional variant; same VBR/VC specs but symmetrical clamping; requires no polarity awareness during placement | Suitable for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur | Choose 1.5KE56CA only if bidirectional protection is required; not a drop-in replacement due to different polarity handling. |
Compared with 1.5KE56A-E3/51, SMBJ58A trades surge robustness for compactness, while 1.5KE56CA provides polarity-agnostic clamping at identical voltage thresholds - neither matches the original's 1500 W rating and DO-201AD mechanical ruggedness in high-energy DC rail protection.
Availability
1.5KE56A-E3/51 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor signal line hardening, and telecom DC feed surge suppression requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for 1.5KE56A-E3/51 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes demand proven 1500 W surge resilience and extended temperature operation.
FAQ
What is the breakdown voltage tolerance for 1.5KE56A-E3/51?
The 1.5KE56A-E3/51 has a specified breakdown voltage range of 53.2 V to 58.8 V at 1 mA test current, representing ±5% tolerance around the nominal 56 V rating. This tight VBR window ensures predictable clamping onset in 48 V system designs and aligns with JEDEC standard 1N6289A designation. The device maintains this specification across -55 °C to +125 °C operating ambient.
Does 1.5KE56A-E3/51 meet automotive qualification standards?
No - 1.5KE56A-E3/51 is a commercial-grade part with E3 suffix (RoHS compliant, JESD 201 Class 1A whisker test). AEC-Q101 qualification applies only to HE3-suffixed variants (e.g., 1.5KE56AHE3_B). For automotive applications requiring AEC-Q101, engineers must select the HE3 version; 1.5KE56A-E3/51 remains suitable for industrial and telecom use where AEC-Q101 is not mandated.
What is the maximum clamping voltage of 1.5KE56A-E3/51 under surge conditions?
The maximum clamping voltage (VC) of 1.5KE56A-E3/51 is 77.0 V at 19.5 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is measured per Figure 7 in Vishay document 88301 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for verifying margin against downstream component absolute maximum ratings.
Can 1.5KE56A-E3/51 be used in bidirectional signal protection?
No - 1.5KE56A-E3/51 is strictly unidirectional, with cathode marked by a band. Bidirectional operation requires the CA-suffixed variant (e.g., 1.5KE56CA), which provides symmetrical clamping in both polarities. Using 1.5KE56A-E3/51 on AC or floating lines risks forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
What is the thermal resistance from junction to ambient for 1.5KE56A-E3/51?
The typical junction-to-ambient thermal resistance (RθJA) of 1.5KE56A-E3/51 is 75 °C/W under standard mounting conditions (PCB pad area per JEDEC 51-3). This value governs steady-state power dissipation limits and must be applied with the derating curve in Figure 5 of document 88301 - e.g., at 75 °C ambient, usable power drops to ~3.25 W before exceeding the 6.5 W rated PD.
1.5KE56A-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE56A-E3/51 FAQ
1.How can I place an order for 1.5KE56A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE56A-E3/51 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 1.5KE56A-E3/51 reliable?
The price and inventory of 1.5KE56A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE56A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE56A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE56A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE56A-E3/51?
1.5KE56A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE56A-E3/51 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 1.5KE56A-E3/51?
For technical support, including 1.5KE56A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE56A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE56A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE56A-E3/51 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 1.5KE56A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE56A-E3/51?
All 1.5KE56A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE56A-E3/51, 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 1.5KE56A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE56A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE56A-E3/51 Tags
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