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Vishay General Semiconductor - Diodes Division 1.5KE43A-E3/51
- Part No.:
- 1.5KE43A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43A-E3/51.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,729
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Product details
Overview
1.5KE43A-E3/51 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 43 V breakdown voltage (VBR = 40.9–45.2 V at 1.0 mA), 36.8 V maximum standoff voltage (VWM), 59.3 V clamping voltage (VC) at 25.3 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and operates from –55 °C to +175 °C - used in automotive power supply input stages and industrial sensor interface protection.
For engineers reviewing the 1.5KE43A-E3/51 datasheet, 1.5KE43A-E3/51 pinout, 1.5KE43A-E3/51 application, or 1.5KE43A-E3/51 equivalent, this device delivers verified clamping performance for IEC 61000-4-5 surge immunity, fast sub-nanosecond response, and RoHS-compliant commercial-grade packaging with matte tin-plated leads solderable per J-STD-002.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction optimized for high-energy transient suppression. Its clamping action responds within <1 ns, limiting voltage overshoot during 10/1000 µs surges up to 25.3 A while maintaining low incremental surge resistance and stable thermal performance up to 175 °C junction temperature.
The device complies with JEDEC standards for transient suppressors and meets UL 497B recognition (QVGQ2). Its 1.5KE case style provides robust epoxy encapsulation rated UL 94 V-0, with thermal resistance of 15.4 °C/W (junction-to-lead) and 75 °C/W (junction-to-ambient), enabling reliable operation without heatsinking under typical PCB trace conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at 1.0 mA - defines precise voltage threshold where clamping initiates, critical for matching system overvoltage tolerance margins |
| VWM | 36.8 V - maximum continuous reverse operating voltage; ensures no leakage conduction during normal 36 V nominal rail operation |
| VC @ IPPM | 59.3 V at 25.3 A - actual clamped voltage seen by protected IC during full 1500 W surge, directly determining downstream component stress |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity, qualifying for Level 4 IEC 61000-4-5 (4 kV line-to-earth) |
| IFSM | 200 A (8.3 ms half-sine) - surge current rating for unidirectional forward conduction, supporting inductive load switch-off transients |
| TJ max. | +175 °C - extended junction temperature enables use in under-hood automotive or high-ambient industrial environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance allows efficient heat transfer to PCB copper, reducing thermal derating needs |
Pinout & Package
Package: 1.5KE molded epoxy case (Case Style 1.5KE), axial-leaded, RoHS-compliant, matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during surge | Connected to protected circuit ground or low-side return path; must be routed with minimal inductance for effective clamping |
| Cathode | Reverse-biased terminal during normal operation | Connected to protected line (e.g., 36 V rail); color band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 1500 W peak pulse power (10/1000 µs) | Supports single-event surge immunity up to 4 kV per IEC 61000-4-5 without degradation across 1000+ cycles |
| Clamping time < 1 ns | Prevents voltage overshoot from reaching sensitive gate oxides in MOSFETs or CMOS inputs before protection engages |
| UL 94 V-0 epoxy molding | Provides flame-retardant mechanical integrity in high-energy fault conditions, meeting industrial safety requirements |
| JESD 201 Class 1A whisker resistance | Ensures solder joint reliability in automated assembly and long-term storage without tin whisker growth risk |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V/24 V vehicle battery feed to body control module experiencing load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed between input rail and ground, absorbing >1500 W surge energy in <1 ns to prevent damage to LDOs and microcontrollers. Use Value: Maintains VC ≤ 59.3 V during 25.3 A transients, keeping downstream 40 V-rated components within safe operating area. |
Use Scenario: 4–20 mA analog sensor loop exposed to ESD (IEC 61000-4-2) and inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS shunting transient energy on signal line to ground, placed adjacent to connector entry point. Use Value: Limits induced voltage to ≤59.3 V during 8 kV contact discharge, preserving 36 V input tolerance of precision ADC front-end. |
| Telecom DC Power Distribution | Consumer Equipment AC/DC Adapter Output |
Use Scenario: –48 V telecom power shelf output feeding remote radio units, subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after upstream MOV, providing fast, low-clamp protection for DC-DC converter inputs. Use Value: Clamps 10/1000 µs surges to 59.3 V at 25.3 A, complementing slower MOVs to meet GR-1089-CORE Level 3 surge requirements. |
Use Scenario: 19 V output of laptop AC/DC adapter subjected to user-induced ESD and accidental short-circuit recovery spikes. IC Role / Device Role / Timing Role: Final-stage protection diode on adapter output connector, safeguarding host device USB-C PD controller and battery management IC. Use Value: Withstands 200 A 8.3 ms forward surge and clamps reverse transients to 59.3 V, preventing latch-up in 20 V-rated buck controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Same VBR range (40.9–45.2 V), but SMC package (surface-mount), lower PPPM = 600 W, higher VC = 69.4 V at 8.7 A | Designed for space-constrained PCBs; unsuitable for 1500 W surge events requiring axial-leaded thermal mass | Select SMBJ43A only when board area is limited and surge threat level is ≤2 kV (IEC 61000-4-5 Level 2). |
| 1.5KE43CA | Bidirectional variant with identical VBR, VWM, and VC; symmetric clamping for AC-coupled or floating lines | Required for differential signal pairs (e.g., RS-485) or AC power inputs where polarity reversal occurs | Choose 1.5KE43CA only when protecting bidirectional signals or ungrounded circuits; 1.5KE43A-E3/51 is optimal for grounded DC rails. |
Compared with SMBJ43A and 1.5KE43CA, the 1.5KE43A-E3/51 offers superior 1500 W surge handling and lower clamping voltage in a through-hole package ideal for high-reliability power entry points, whereas SMBJ43A trades power for footprint and 1.5KE43CA adds bidirectional symmetry at no clamping performance gain for DC applications.
Availability
1.5KE43A-E3/51 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, and telecom DC distribution requiring stable component supply, long-lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for 1.5KE43A-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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh-environment power systems, emphasizing rugged packaging, repeatable clamping, and extended temperature operation beyond standard commercial grades.
FAQ
What is the breakdown voltage tolerance of the 1.5KE43A-E3/51?
The 1.5KE43A-E3/51 has a specified breakdown voltage range of 40.9 V to 45.2 V at 1.0 mA test current, representing ±5% tolerance around the nominal 43 V rating. This tight VBR window ensures predictable clamping onset across production lots and supports precise coordination with downstream overvoltage protection thresholds in designs using the 1.5KE43A-E3/51.
Is the 1.5KE43A-E3/51 suitable for automotive applications?
Yes, the 1.5KE43A-E3/51 is qualified for automotive use in non-AEC-Q101 configurations, with a junction temperature range of –55 °C to +175 °C and robust construction meeting UL 497B. While the base 1.5KE43A-E3/51 is commercial grade, Vishay offers AEC-Q101-qualified variants (e.g., 1.5KE43AHE3_B) for mission-critical automotive modules - confirm qualification status when specifying the 1.5KE43A-E3/51 for under-hood deployment.
How does the clamping voltage of the 1.5KE43A-E3/51 compare to its standoff voltage?
The 1.5KE43A-E3/51 has a maximum standoff voltage (VWM) of 36.8 V and a clamping voltage (VC) of 59.3 V at 25.3 A. This 22.5 V differential ensures reliable blocking during normal operation while limiting surge-induced voltage to a safe margin below typical 60 V absolute maximum ratings of protected ICs - a key design advantage of the 1.5KE43A-E3/51 in 36 V system protection.
What is the lead finish and solderability specification for the 1.5KE43A-E3/51?
The 1.5KE43A-E3/51 features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards, and passes JESD 201 Class 1A whisker testing. Its E3 suffix confirms RoHS compliance and suitability for wave, reflow, and hand-soldering processes up to 275 °C for 10 seconds - critical for consistent manufacturability in high-volume production of assemblies using the 1.5KE43A-E3/51.
Can the 1.5KE43A-E3/51 be used in parallel for higher surge current handling?
Yes, multiple 1.5KE43A-E3/51 devices can be paralleled to increase total peak pulse current capacity, provided layout symmetry ensures balanced current sharing - e.g., equal trace lengths and thermal coupling. However, derating is required: two units do not double IPPM to 50.6 A due to VBR mismatch; actual shared current depends on unit-to-unit VBR variation (±5%), so system-level validation is essential when scaling surge capability with the 1.5KE43A-E3/51.
1.5KE43A-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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- 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
1.5KE43A-E3/51 FAQ
1.How can I place an order for 1.5KE43A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43A-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 1.5KE43A-E3/51 reliable?
The price and inventory of 1.5KE43A-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 1.5KE43A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE43A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43A-E3/51?
1.5KE43A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43A-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 1.5KE43A-E3/51?
For technical support, including 1.5KE43A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE43A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43A-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 1.5KE43A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE43A-E3/51?
All 1.5KE43A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43A-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 1.5KE43A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE43A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43A-E3/51 Tags
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