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Vishay General Semiconductor - Diodes Division 1.5KE51CAHE3_B/C
- Part No.:
- 1.5KE51CAHE3_B/C
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51CAHE3_B/C.pdf
- Description:
- 1.5KW,51V 5%,BIDIR,AXIAL TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
1.5KE51CAHE3_B/C from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at 1.0 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 70.1 V at 21.4 A, and operates across –55 °C to +175 °C. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE51CAHE3_B/C datasheet, 1.5KE51CAHE3_B/C pinout, 1.5KE51CAHE3_B/C application, or 1.5KE51CAHE3_B/C equivalent, this device delivers verified bidirectional clamping performance, AEC-Q101 qualification (HE3 suffix), RoHS-compliant matte tin leads, and UL 94 V-0 molded epoxy packaging - critical for automotive, industrial, and telecom surge protection design.
Technical Context
This bidirectional TVS diode employs a glass passivated silicon junction optimized for sub-nanosecond response (<1 ns) and low incremental surge resistance. Its symmetrical I-V characteristics enable identical clamping in both polarities, with no polarity marking on the case.
It is rated for 1500 W peak pulse power under 10/1000 µs waveform at 0.01% duty cycle, derated above 25 °C per Fig. 2, and supports 200 A non-repetitive forward surge current (unidirectional only - not applicable here). Thermal resistance is 75 °C/W (junction-to-ambient) and 15.4 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1.0 mA - defines precise voltage threshold where clamping initiates in both directions |
| VWM | 43.6 V - maximum continuous working voltage before leakage exceeds 1.0 µA; sets safe operating margin below breakdown |
| VC @ IPPM | 70.1 V at 21.4 A - actual clamped voltage during 1500 W transient; determines protected circuit's max stress level |
| PPPM | 1500 W - peak surge energy handling capability under standardized 10/1000 µs waveform; enables single-device protection for moderate-energy transients |
| TJ range | –55 °C to +175 °C - wide junction temperature range supports under-hood automotive and industrial environments without derating loss |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package (0.375" lead length); compatible with through-hole PCB assembly and manual rework |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard; HE3 suffix denotes compliance |
Pinout & Package
1.5KE51CAHE3_B/C uses a two-terminal axial-leaded DO-201AD package (Case Style 1.5KE) with no polarity marking - consistent with its bidirectional function. Leads are matte tin plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No designated anode/cathode; terminals are interchangeable - enables placement flexibility and eliminates orientation errors in layout |
| Lead 1 / Lead 2 | Connection to protected line and ground/reference | Leads serve as low-inductance entry/exit points for surge current; 0.375" (9.5 mm) length optimizes thermal dissipation into PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable breakdown voltage and long-term reliability under repeated surge stress |
| 1500 W peak pulse power (10/1000 µs) | Protects against high-energy transients such as ISO 7637-2 Pulse 5a without cascading failure |
| Sub-nanosecond response time | Clamps within <1 ns - faster than MOVs or GDTs - preserving integrity of fast digital and analog signals |
| UL 94 V-0 epoxy molding | Self-extinguishing encapsulation meets fire-safety requirements for enclosed industrial and automotive enclosures |
| AEC-Q101 qualified (HE3) | Validated for automotive powertrain and body electronics applications requiring zero early-life failures |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across power rail input to divert surge current away from downstream DC-DC converters and microcontrollers. Use Value: Clamps to 70.1 V at 21.4 A, limiting rail overshoot well below 80 V absolute maximum ratings of common automotive PMICs. |
Use Scenario: Safeguarding 4–20 mA current-loop transmitters and RS-485 nodes in factory automation systems exposed to motor switching noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) parallel clamp on signal pair, responding in <1 ns to suppress EFT bursts without distorting data edges. Use Value: Symmetrical clamping ensures equal protection for positive and negative transients on differential lines - critical for bidirectional protocols. |
| Telecom AC/DC Input Stage | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side transient suppression on AC/DC adapter outputs feeding DSL modems or VoIP gateways. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 43.6 V) placed after rectification but before LDO regulators to absorb residual line surges. Use Value: 1500 W rating handles repetitive surges from nearby lightning strikes without degradation - validated over >10,000 pulses in accelerated life testing. |
Use Scenario: Snubbing inductive kickback from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Bidirectional clamp across motor terminals to quench arcing and prevent MCU reset from conducted noise. Use Value: High TJ max (175 °C) allows mounting near hot motor housings without thermal derating; DO-201AD leads support mechanical strain relief. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Surface-mount SMB package (3.5 × 3.5 mm), lower PPPM = 600 W, same VBR range and bidirectional operation | Designed for space-constrained PCBs; lacks axial lead thermal mass and AEC-Q101 qualification in standard grade | Select when board area is limited and automotive qualification is not required; verify layout thermal relief for 600 W pulses |
| 1.5KE51C | Same DO-201AD package and electrical specs, but commercial-grade (E3 suffix only); no AEC-Q101 validation | Approved for consumer/industrial use only; excluded from automotive production due to missing stress-test certification | Choose for cost-sensitive non-automotive designs where full AEC-Q101 traceability is unnecessary |
Compared with 1.5KE51CAHE3_B/C, SMBJ51CA trades mechanical robustness and automotive qualification for compactness, while 1.5KE51C retains identical form and function but omits AEC-Q101 validation - making the HE3 variant the sole choice for production automotive systems requiring certified reliability.
Availability
1.5KE51CAHE3_B/C is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and appliance motor drives requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for 1.5KE51CAHE3_B/C 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 demanding industrial and automotive applications.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments, emphasizing rugged packaging, repeatable clamping, and extended temperature operation - targeting applications where failure is not an option.
FAQ
What is the exact breakdown voltage range for 1.5KE51CAHE3_B/C?
The 1.5KE51CAHE3_B/C has a guaranteed breakdown voltage (VBR) range of 48.5 V to 53.6 V at a test current of 1.0 mA, measured in both directions due to its bidirectional construction. This specification is confirmed in Vishay's official datasheet (Document Number: 88301, Rev. 09-Aug-2022) and applies across the full operating temperature range.
Is 1.5KE51CAHE3_B/C suitable for automotive applications?
Yes, 1.5KE51CAHE3_B/C is AEC-Q101 qualified (denoted by the HE3 suffix), with validation covering temperature cycling, high-temperature reverse bias, and ESD robustness. It is approved for use in automotive powertrain, body control, and infotainment modules where transient immunity and long-term reliability are mandatory - unlike non-HE3 variants such as 1.5KE51C.
How does the clamping voltage of 1.5KE51CAHE3_B/C compare to its breakdown voltage?
At its rated peak pulse current of 21.4 A (10/1000 µs waveform), the 1.5KE51CAHE3_B/C clamps to 70.1 V - a 30–45% increase over its VBR window (48.5–53.6 V). This incremental clamping voltage (ΔVC ≈ 16.5–21.6 V) reflects low dynamic impedance and ensures protected circuits remain within safe operating limits during surge events.
What package type and lead finish does 1.5KE51CAHE3_B/C use?
The 1.5KE51CAHE3_B/C uses the axial-leaded DO-201AD package (Case Style 1.5KE), with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. The HE3 suffix confirms it meets JESD 201 Class 2 whisker resistance, and the molded epoxy body complies with UL 94 V-0 flammability requirements.
Can 1.5KE51CAHE3_B/C be used in place of unidirectional TVS diodes like 1.5KE51AHE3_B/C?
No - 1.5KE51CAHE3_B/C is strictly bidirectional and lacks polarity marking, whereas 1.5KE51AHE3_B/C is unidirectional with a cathode band. Substituting them requires circuit redesign: the bidirectional version protects both polarities simultaneously but cannot replace unidirectional configurations where forward conduction must be blocked in one direction (e.g., DC power rail protection with reverse-polarity safeguard).
1.5KE51CAHE3_B/C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE51CAHE3_B/C FAQ
1.How can I place an order for 1.5KE51CAHE3_B/C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51CAHE3_B/C 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 1.5KE51CAHE3_B/C reliable?
The price and inventory of 1.5KE51CAHE3_B/C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51CAHE3_B/C is usually 5 days.
3.What payment methods are accepted for 1.5KE51CAHE3_B/C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51CAHE3_B/C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51CAHE3_B/C?
1.5KE51CAHE3_B/C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51CAHE3_B/C 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 1.5KE51CAHE3_B/C?
For technical support, including 1.5KE51CAHE3_B/C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51CAHE3_B/C requirements.
6.How does Aetrix verify that 1.5KE51CAHE3_B/C is sourced from the original manufacturer or authorized distributors?
All 1.5KE51CAHE3_B/C 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 1.5KE51CAHE3_B/C meets industry standards.
7.What is the process for return or replacement of 1.5KE51CAHE3_B/C?
All 1.5KE51CAHE3_B/C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51CAHE3_B/C, 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 1.5KE51CAHE3_B/C part is unused and in its original packaging.
Return procedure for 1.5KE51CAHE3_B/C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51CAHE3_B/C Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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