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Vishay General Semiconductor - Diodes Division 1.5KE33A/54
- Part No.:
- 1.5KE33A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33A/54.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:8,286
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Product details
Overview
1.5KE33A 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 31.4 V minimum breakdown voltage (VBR), 28.2 V maximum stand-off voltage (VWM), 45.7 V clamping voltage (VC) at 32.8 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 1.5KE33A datasheet, 1.5KE33A pinout, 1.5KE33A application, or 1.5KE33A equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, JEDEC 1.5KE package mechanical data, and direct alternative options with documented functional trade-offs for ESD and lightning transient suppression design.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time (<1 ns) and low incremental surge resistance. Its clamping action activates when reverse voltage exceeds 28.2 V (VWM), with guaranteed breakdown between 31.4 V and 34.7 V at 1 mA test current.
The device sustains 1500 W peak pulse power per 10/1000 µs waveform at TA = 25 °C, derating linearly above 25 °C with RθJA = 75 °C/W and RθJL = 15.4 °C/W. It supports 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 3.5 V max forward voltage at 100 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at IT = 1 mA - defines precise voltage threshold where clamping begins |
| VWM | 28.2 V maximum - ensures reliable blocking during normal 24 V DC operation without leakage |
| VC @ IPPM | 45.7 V at 32.8 A - limits downstream IC stress during 1500 W transient events |
| PPPM | 1500 W (10/1000 µs) - enables robust protection against IEC 61000-4-5 Level 4 surges |
| IFSM | 200 A (8.3 ms half-sine) - withstands high-energy inductive switch-off spikes in relay/motor drives |
| TJ range | –55 °C to +175 °C - supports under-hood automotive and industrial ambient environments |
| Package | JEDEC DO-201AD (Case Style 1.5KE) - axial-leaded, RoHS-compliant molded epoxy body |
Pinout & Package
1.5KE33A uses the standard DO-201AD axial package (Case Style 1.5KE), with cathode identified by a color band on the body. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, rated for 275 °C dip soldering (10 s max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); conducts only during overvoltage transients |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| 1500 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 4 kV open-circuit / 2 kA short-circuit |
| <1 ns response time | Clamps before sensitive logic or analog circuitry experiences damaging overvoltage |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., EFT bursts) |
| AEC-Q101 qualified option available | 1.5KE33AHE3_B variant meets automotive-grade stress testing for under-hood applications |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 24 V battery-fed ECUs exposed to load dump (ISO 16750-2) and jump-start transients. IC Role / Device Role / Timing Role: Primary shunt clamp on main power rail, absorbing >100 J energy in <100 ms. Use Value: Limits rail voltage to ≤45.7 V during 1500 W surges, preventing damage to MCU, CAN transceivers, and PMICs. |
Use Scenario: 4–20 mA current loop interfaces in PLC analog input modules subjected to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across signal and return lines near connector entry. Use Value: Clamps transients to safe levels within nanoseconds while maintaining <1 µA leakage at 28.2 V operating voltage. |
| Telecom AC/DC Adapter Output Protection | Consumer Appliance Motor Drive Control |
Use Scenario: Secondary-side 12 V output of offline SMPS powering base station control logic. IC Role / Device Role / Timing Role: Final-stage overvoltage suppressor downstream of regulation, guarding against transformer flyback overshoot. Use Value: Withstands repetitive 10/1000 µs surges at 0.01% duty cycle without degradation, ensuring multi-year field reliability. |
Use Scenario: Microcontroller GPIO lines driving relays or small solenoids in smart home appliances. IC Role / Device Role / Timing Role: Localized TVS at microcontroller I/O pin, directly shunting inductive turn-off spikes. Use Value: 32.8 A peak pulse current rating handles 200 A inductive surges via energy sharing with PCB trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | DO-214AA package; 600 W PPPM; lower VC = 53.3 V at 11.8 A; RθJA = 110 °C/W | Better suited for space-constrained PCB layouts but requires higher board copper area for thermal management | Select SMBJ33A when footprint size is critical and peak surge energy is ≤600 W; verify thermal margin at full load. |
| 1.5SMC33A | SMA package; 1500 W PPPM; identical VBR/VWM/VC; RθJA = 85 °C/W; no AEC-Q101 variant | Surface-mount alternative with same electrical specs but reduced lead-to-lead creepage distance | Choose 1.5SMC33A for automated SMT assembly; confirm creepage/clearance compliance for 250 VRMS isolation requirements. |
Compared with 1.5KE33A, SMBJ33A offers smaller form factor at reduced surge capacity and higher thermal resistance, while 1.5SMC33A matches peak power and clamping but trades axial leads for surface-mount compatibility and slightly lower thermal efficiency - both require layout and qualification adjustments despite functional similarity.
Availability
1.5KE33A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom adapter output stabilization requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 1.5KE33A 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 handling, and automotive qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising long-term stability.
FAQ
What is the breakdown voltage tolerance of the 1.5KE33A?
The 1.5KE33A has a guaranteed breakdown voltage range of 31.4 V to 34.7 V at 1 mA test current (VBR min/max), corresponding to ±5% tolerance around the nominal 33 V rating. This tight distribution ensures consistent clamping onset across production lots and supports predictable system-level overvoltage margining in designs using 1.5KE33A.
Does the 1.5KE33A meet automotive qualification standards?
The base 1.5KE33A is commercial-grade; however, the 1.5KE33AHE3_B variant is explicitly AEC-Q101 qualified per Vishay documentation. This version undergoes stress testing including HTSL, TC, UHAST, and bond strength validation - confirming suitability for under-hood automotive applications where 1.5KE33AHE3_B replaces the standard 1.5KE33A in qualified BOMs.
How does the 1.5KE33A perform under elevated ambient temperatures?
The 1.5KE33A derates linearly above 25 °C ambient: its 1500 W peak pulse power drops to ~1125 W at 75 °C case temperature, based on RθJA = 75 °C/W. The device remains fully functional up to TJ = 175 °C, but sustained high-temperature operation requires thermal design verification using Vishay's Fig. 2 and Fig. 5 curves for 1.5KE33A.
Can the 1.5KE33A be used in bidirectional configurations?
No - the 1.5KE33A is strictly unidirectional. Bidirectional variants use the "CA" suffix (e.g., 1.5KE33CA). Using 1.5KE33A in reverse-biased AC applications risks permanent failure due to lack of symmetrical clamping; always select 1.5KE33CA or equivalent for bidirectional surge paths such as telecom line interfaces or AC sensor inputs.
What is the maximum clamping voltage of the 1.5KE33A during a 10/1000 µs surge?
The maximum clamping voltage (VC) of the 1.5KE33A is 45.7 V at 32.8 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per JEDEC standards and represents the worst-case voltage seen by downstream circuitry during a full-rated 1500 W transient event - a critical parameter for validating IC survivability in 1.5KE33A-protected designs.
1.5KE33A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE33A/54 FAQ
1.How can I place an order for 1.5KE33A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A/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 1.5KE33A/54 reliable?
The price and inventory of 1.5KE33A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33A/54 is usually 5 days.
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Once your 1.5KE33A/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 1.5KE33A/54?
For technical support, including 1.5KE33A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A/54 requirements.
6.How does Aetrix verify that 1.5KE33A/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A/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 1.5KE33A/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE33A/54?
All 1.5KE33A/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A/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 1.5KE33A/54 part is unused and in its original packaging.
Return procedure for 1.5KE33A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A/54 Tags
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