My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5KE33CAHE3/51
- Part No.:
- 1.5KE33CAHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33CAHE3/51.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,801
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE33CAHE3/51 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in signal and power lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1.0 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 45.7 V at 32.8 A, and operates across –55 °C to +175 °C junction temperature. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients in automotive and industrial systems.
For engineers reviewing the 1.5KE33CAHE3/51 datasheet, 1.5KE33CAHE3/51 pinout, 1.5KE33CAHE3/51 application, or 1.5KE33CAHE3/51 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping behavior under standardized surge waveforms, thermal resistance data, and RoHS-compliant packaging details - all critical for ESD/surge protection design validation and BOM selection.
Technical Context
This bi-directional TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its symmetrical clamping characteristic applies equally in both polarities, eliminating polarity marking on the package and simplifying layout for AC-coupled or floating signal lines.
The device meets JEDEC-standard 10/1000 µs surge testing with 1500 W peak power rating, derates linearly above 25 °C ambient per Fig. 2, and supports repetitive surge events at ≤0.01% duty cycle. Thermal resistance from junction to lead is 15.4 °C/W, enabling effective heat dissipation through PCB copper pours or short lead traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines reliable conduction onset threshold for bidirectional clamping |
| VWM | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 45.7 V at 32.8 A - clamped voltage during 10/1000 µs surge, limiting stress on downstream components |
| PPPM | 1500 W - peak transient power handling capability, enabling protection against IEC 61000-4-5 Level 4 surges |
| TJ max. | +175 °C - high-temperature operation supports under-hood automotive and industrial environments |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance allows efficient heat transfer to PCB or heatsink |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: Case Style 1.5KE - molded epoxy body with matte tin-plated leads, UL 94 V-0 rated, 0.375" (9.5 mm) lead length, 0.042" (1.07 mm) lead diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional current path | No polarity marking; either terminal serves as anode or cathode depending on transient polarity |
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) | Supports protection against severe transients including ISO 7637-2 Pulse 5a and IEC 61000-4-5 combination wave surges |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs |
| RoHS compliant & JESD 201 Class 2 whisker resistant (HE3 suffix) | Enables use in high-reliability industrial and automotive assemblies without tin whisker mitigation concerns |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between signal line and ground, responding within <1 ns to suppress transients exceeding 28.2 V. Use Value: Prevents permanent damage to 3.3 V/5 V logic inputs while maintaining signal integrity during normal operation below VWM. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC modules from motor drive noise and relay coil kickback. IC Role / Device Role / Timing Role: Standoff protector on 4–20 mA current loop or 0–10 V analog output line, conducting only during >31.4 V excursions. Use Value: Enables uninterrupted sensor operation in electrically noisy environments without adding series impedance or affecting DC accuracy. |
| Telecom Line Surge Protection | Consumer Device USB/Power Port Protection |
Use Scenario: Safeguarding Ethernet PHY interfaces and PoE injectors against induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary shunt protector on differential pair, symmetrically clamping common-mode and differential-mode transients up to ±45.7 V. Use Value: Meets GR-1089-CORE Level 3 surge immunity requirements without requiring additional series impedance or filtering. |
Use Scenario: Adding secondary-level surge protection on USB Type-A power input and HDMI hot-plug detection lines in smart TVs and set-top boxes. IC Role / Device Role / Timing Role: Fast-acting clamp placed after primary fuse and upstream of internal DC-DC converters and SoC power rails. Use Value: Absorbs 1500 W surges without degradation, preserving system uptime and avoiding costly field returns due to port damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | 600 W PPPM, SMC package (smaller footprint), higher VC/VBR ratio (1.53) | Limited to lower-energy transients; not suitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge energy is ≤600 W |
| 1.5SMC33CA | Same 1500 W rating but SMC package, slightly higher VBR tolerance (±5% vs ±4.5%), no AEC-Q101 qualification | Not approved for automotive under-hood use; requires external qualification for automotive programs | Select for cost-sensitive industrial designs where AEC-Q101 is not mandated |
Compared with 1.5KE33CAHE3/51, SMBJ33CA offers smaller size but reduced surge margin, while 1.5SMC33CA matches power rating but lacks automotive qualification and has looser VBR tolerance - making 1.5KE33CAHE3/51 the preferred choice for AEC-Q101-compliant, high-energy protection where leaded mounting and thermal mass are advantageous.
Availability
1.5KE33CAHE3/51 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, telecom infrastructure, and consumer electronics applications requiring stable component supply, long lifecycle support, and traceable sourcing.
Supply support for 1.5KE33CAHE3/51 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, efficiency, and application-specific optimization.
The 1.5KE family was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where failure resilience and AEC-Q101 compliance are mandatory design criteria.
FAQ
What is the breakdown voltage range of the 1.5KE33CAHE3/51?
The 1.5KE33CAHE3/51 has a guaranteed breakdown voltage (VBR) range of 31.4 V to 34.7 V at a test current of 1.0 mA, measured per JEDEC standard. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage threshold design in circuits protecting 24 V or 3.3 V/5 V logic rails. The value is confirmed in Vishay's official datasheet Document Number 88301, Revision 11-Oct-16.
Is the 1.5KE33CAHE3/51 suitable for automotive applications?
Yes, the 1.5KE33CAHE3/51 is AEC-Q101 qualified (per note 2 on page 3 of datasheet 88301), specifically approved for automotive use in categories including engine control, body electronics, and ADAS sensor interfaces. Its –55 °C to +175 °C operating junction temperature range, glass-passivated junction, and JESD 201 Class 2 whisker resistance (HE3 suffix) meet stringent automotive reliability requirements.
What does the "CA" suffix indicate in 1.5KE33CAHE3/51?
The "CA" suffix in 1.5KE33CAHE3/51 denotes a bi-directional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions, with identical VBR, VC, and IPPM characteristics regardless of polarity. Unlike uni-directional "A" variants, it has no cathode band marking and is ideal for AC-coupled lines, differential pairs, or floating grounds.
How does the 1.5KE33CAHE3/51 perform under repeated surge conditions?
The 1.5KE33CAHE3/51 supports repetitive surge events at a maximum duty cycle of 0.01%, as specified in its absolute maximum ratings. Its thermal resistance (RθJL = 15.4 °C/W) and power derating curve (Fig. 5) allow safe operation up to 6.5 W continuous dissipation at TL = 75 °C. For sustained surge exposure, PCB copper area and lead length must be optimized per Vishay's thermal guidelines.
What is the clamping voltage of the 1.5KE33CAHE3/51 at its rated peak pulse current?
At its rated peak pulse current (IPPM) of 32.8 A (10/1000 µs waveform), the 1.5KE33CAHE3/51 clamps to a maximum voltage of 45.7 V. This value is measured per JEDEC standard and represents the upper limit of voltage seen by protected circuitry during worst-case surge events - a critical parameter for ensuring downstream components remain within their absolute maximum ratings.
1.5KE33CAHE3/51 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 32.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE33CAHE3/51 FAQ
1.How can I place an order for 1.5KE33CAHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33CAHE3/51 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 1.5KE33CAHE3/51 reliable?
The price and inventory of 1.5KE33CAHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33CAHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE33CAHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33CAHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33CAHE3/51?
1.5KE33CAHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33CAHE3/51 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 1.5KE33CAHE3/51?
For technical support, including 1.5KE33CAHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33CAHE3/51 requirements.
6.How does Aetrix verify that 1.5KE33CAHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33CAHE3/51 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 1.5KE33CAHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE33CAHE3/51?
All 1.5KE33CAHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33CAHE3/51, 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 1.5KE33CAHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE33CAHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33CAHE3/51 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
