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Vishay General Semiconductor - Diodes Division 1.5KE51A-E3/54
- Part No.:
- 1.5KE51A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51A-E3/54.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:1,206
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Product details
Overview
1.5KE51A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 48.5 V to 53.6 V breakdown voltage (VBR) at 1 mA, 43.6 V stand-off voltage (VWM), 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE51A-E3/54 datasheet, 1.5KE51A-E3/54 pinout, 1.5KE51A-E3/54 application, or 1.5KE51A-E3/54 equivalent, this part delivers verified clamping performance, RoHS-compliant matte tin-plated leads, JEDEC-standard 1.5KE package compatibility, and commercial-grade reliability for industrial power supply input stages, automotive body control modules, and telecom line interface protection.
Technical Context
The 1.5KE51A-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response time (<1 ns) to transient events. Its unidirectional polarity uses a cathode band marking and exhibits low incremental surge resistance, ensuring stable clamping under repetitive 10/1000 µs pulses at 0.01% duty cycle.
Thermal design is supported by a typical junction-to-lead thermal resistance of 15.4 °C/W and maximum junction temperature of +175 °C. It complies with JESD 22-B106 solder dip (275 °C, 10 s) and JESD 201 Class 1A whisker testing, confirming robustness for automated PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines reliable avalanche initiation threshold for overvoltage detection |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 70.1 V at 21.4 A - clamped voltage during 1500 W transient, limiting stress on downstream components |
| PPPM | 1500 W - peak pulse power handling per 10/1000 µs waveform, critical for lightning surge immunity |
| IFSM | 200 A - non-repetitive forward surge current rating (8.3 ms half-sine), supports inrush tolerance |
| TJ max. | +175 °C - enables operation in high-temperature environments such as engine compartments or enclosed power supplies |
| RθJL | 15.4 °C/W - low thermal resistance from junction to lead, facilitating heat dissipation without heatsink |
Pinout & Package
Package: JEDEC-standard Case Style 1.5KE - molded epoxy body with matte tin-plated axial leads, UL 94 V-0 rated, 0.375" (9.5 mm) lead length, 0.210"–0.285" body diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line (e.g., +VIN or signal rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment inputs |
| Sub-nanosecond response time | Clamps transients before sensitive ICs experience damaging voltage overshoot |
| RoHS-compliant E3 suffix | Meets environmental compliance for global electronics manufacturing without lead-free assembly restrictions |
| Low incremental surge resistance | Minimizes VC rise under high di/dt events, improving protection margin for 5 V–48 V systems |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and relay coil flyback. IC Role / Device Role: Primary clamping device placed across input terminals to limit transient voltage to ≤70.1 V. Use Value: Prevents damage to upstream rectifier bridge and downstream DC-DC controllers by diverting up to 21.4 A surge current away from sensitive circuitry. | Use Scenario: CAN bus power rail (VBAT) in door module subjected to ISO 7637-2 Pulse 5a load dump events. IC Role / Device Role: Unidirectional TVS connected between VBAT and chassis ground to clamp positive transients only. Use Value: Maintains system uptime by suppressing 120 V/100 ms load dump spikes to safe levels below MCU and transceiver absolute maximum ratings. |
| Telecom Line Interface | Consumer Sensor Signal Line |
Use Scenario: -48 V telecom central office line card with tip/ring protection against lightning-induced surges on outside plant wiring. IC Role / Device Role: Paired unidirectional TVS devices (one per polarity) guarding differential line interface ICs. Use Value: Enables compliance with Telcordia GR-1089-CORE Zone 3 surge requirements via 1500 W single-event handling capability. | Use Scenario: Analog output line (0–10 V) of industrial temperature sensor exposed to ESD and nearby motor switching noise. IC Role / Device Role: Low-capacitance TVS placed at connector entry point to suppress fast transients before reaching ADC input. Use Value: Preserves signal integrity by limiting clamping voltage to 70.1 V while adding <0.5 pF parasitic capacitance - negligible impact on 10 kHz bandwidth signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Lower peak pulse power (600 W), smaller SMB package (vs. axial 1.5KE), higher VC/VBR ratio (1.37 vs. 1.45) | Better suited for space-constrained PCBs but requires derating for >1 kV surge events | Select SMBJ51A when board area is limited and surge energy is ≤600 W; retain 1.5KE51A-E3/54 for full 1500 W compliance. |
| 1.5KE51CA | Bidirectional variant with same VBR range, symmetrical clamping in both polarities, no cathode band marking | Required for AC-coupled or floating signal lines where negative transients occur (e.g., RS-485, audio) | Choose 1.5KE51CA only if bidirectional protection is mandated; 1.5KE51A-E3/54 remains optimal for DC rail protection with polarity-aware layout. |
Compared with SMBJ51A and 1.5KE51CA, the 1.5KE51A-E3/54 offers superior surge energy handling in a through-hole package ideal for high-reliability industrial power inputs, while avoiding unnecessary bidirectional complexity or power derating in unidirectional DC systems.
Availability
1.5KE51A-E3/54 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, and telecom line interface applications requiring stable component supply, long-lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for 1.5KE51A-E3/54 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 ruggedized packaging.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, transportation, and infrastructure systems where failure resilience is non-negotiable.
FAQ
What is the breakdown voltage range of the 1.5KE51A-E3/54?
The 1.5KE51A-E3/54 has a guaranteed breakdown voltage (VBR) range of 48.5 V to 53.6 V at a test current of 1 mA, measured per JEDEC standard. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage threshold design in 48 V nominal systems. The value is confirmed in Vishay's official datasheet document 88301, revision 09-Aug-2022.
Is the 1.5KE51A-E3/54 RoHS compliant and qualified for automotive use?
The 1.5KE51A-E3/54 carries the E3 suffix, indicating RoHS compliance and commercial-grade qualification. It is not AEC-Q101 qualified - that status applies only to variants with HE3 suffix (e.g., 1.5KE51AHE3_B). For automotive applications requiring AEC-Q101, engineers must select the HE3 version; the 1.5KE51A-E3/54 remains suitable for industrial and telecom environments where commercial-grade reliability suffices.
How does the clamping voltage of the 1.5KE51A-E3/54 compare to its breakdown voltage?
The 1.5KE51A-E3/54 clamps at 70.1 V when subjected to its rated 21.4 A peak pulse current (10/1000 µs), resulting in a clamping ratio (VC/VBR) of approximately 1.45. This ratio reflects low incremental surge resistance and confirms effective energy diversion. The value is measured under standardized conditions and documented in Table 1 of Vishay's 88301 datasheet.
Can the 1.5KE51A-E3/54 be used in bidirectional protection circuits?
No - the 1.5KE51A-E3/54 is strictly unidirectional, identified by its cathode band marking. Bidirectional protection requires the CA-suffixed variant (e.g., 1.5KE51CA). Using the 1.5KE51A-E3/54 in AC or floating applications risks failure during negative transients, as it blocks conduction below ~0.7 V forward drop and offers no reverse avalanche capability.
What is the maximum junction temperature rating for the 1.5KE51A-E3/54?
The 1.5KE51A-E3/54 has a maximum junction temperature (TJ) rating of +175 °C, validated per JEDEC test conditions. This allows operation in high-ambient environments such as enclosed power supplies or under-hood automotive locations, provided thermal design accounts for its 15.4 °C/W junction-to-lead resistance and 6.5 W steady-state power dissipation limit at TL = 75 °C.
1.5KE51A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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
1.5KE51A-E3/54 FAQ
1.How can I place an order for 1.5KE51A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51A-E3/54 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 1.5KE51A-E3/54 reliable?
The price and inventory of 1.5KE51A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51A-E3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE51A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51A-E3/54?
1.5KE51A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51A-E3/54 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 1.5KE51A-E3/54?
For technical support, including 1.5KE51A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51A-E3/54 requirements.
6.How does Aetrix verify that 1.5KE51A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51A-E3/54 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 1.5KE51A-E3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE51A-E3/54?
All 1.5KE51A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51A-E3/54, 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 1.5KE51A-E3/54 part is unused and in its original packaging.
Return procedure for 1.5KE51A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51A-E3/54 Tags
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