My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5KE51CA-E3/73
- Part No.:
- 1.5KE51CA-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51CA-E3/73.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:3,617
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE51CA-E3/73 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 junction temperature. It is used to protect MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE51CA-E3/73 datasheet, 1.5KE51CA-E3/73 pinout, 1.5KE51CA-E3/73 application, or 1.5KE51CA-E3/73 equivalent, this device serves as a high-energy, fast-response (≈1 ns), glass-passivated TVS for industrial power supplies, automotive body electronics, and telecom line protection where bidirectional surge immunity and AEC-Q101-compliant variants are required.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical electrical characteristics forward and reverse - enabling simplified circuit design for AC-coupled or floating signal paths. Its low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 1.45) ensure minimal let-through voltage during transient events.
The device uses a molded epoxy case (Case Style 1.5KE) with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, rated for solder dip up to 275 °C for 10 s, and meets UL 94 V-0 flammability. It is RoHS-compliant (E3 suffix) and supports commercial-grade operation only - not AEC-Q101 qualified, as 1.5KE51CA falls outside the 6.8–220 V bidirectional AEC-Q101 range (per note on page 1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1.0 mA - defines precise clamping onset threshold under standardized test conditions |
| 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 - peak clamped voltage during 10/1000 µs surge; determines protected circuit's worst-case overvoltage exposure |
| PPPM | 1500 W - peak pulse power handling capability; enables protection against high-energy transients like ISO 7637-2 Pulse 5a |
| IPPM | 21.4 A - maximum non-repetitive surge current; defines minimum trace width and PCB layout requirements for series impedance |
| TJ range | –55 °C to +175 °C - wide thermal operating envelope supporting under-hood automotive and industrial environments |
| Package | Case Style 1.5KE - axial-leaded DO-201AD package; 0.375" lead length, 0.210" body diameter; compatible with through-hole wave soldering |
Pinout & Package
1.5KE51CA-E3/73 is housed in a DO-201AD (Case Style 1.5KE) axial-leaded package with no polarity marking - consistent with its bidirectional function. Leads are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional conduction path | No designated anode or cathode; terminals are electrically interchangeable - simplifies placement on AC or floating lines |
| Lead 1 / Lead 2 | Transient current path | Both leads conduct surge current equally in either direction; requires equal trace impedance and thermal relief on PCB |
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) | Supports IEC 61000-4-5 Level 4 (4 kV) surge protection without external series impedance in many low-impedance circuits |
| Clamping voltage ≤ 70.1 V | Limits downstream IC stress to safe levels for 3.3 V, 5 V, and 12 V logic and power rails |
| Response time ≈ 1 ns | Activates faster than MOVs or GDTs - critical for protecting fast-switching MOSFET gates and high-speed data lines |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance - suitable for high-reliability industrial and telecom assemblies |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protects 24 V DC input stage of programmable logic controllers (PLCs) against load dump and inductive kickback from solenoid drivers. IC Role / Device Role: Primary shunt-type transient suppressor placed directly across input terminals, upstream of bulk capacitance and DC-DC converter. Use Value: Clamps 1500 W surges to ≤70.1 V, preventing damage to input rectifiers and enabling use of lower-voltage-rated input capacitors and FETs. | Use Scenario: Shields LIN bus transceivers and microcontroller I/O pins in door module ECUs from battery line transients during jump-start or alternator load dump. IC Role / Device Role: Bidirectional TVS on LIN signal line and VBAT-referenced power rail to absorb ±100 V/500 ms pulses per ISO 7637-2. Use Value: Symmetric clamping ensures protection during both positive and negative transients without polarity concerns - eliminating need for dual unidirectional devices. |
| Telecom Line Interface | Sensor Signal Conditioning Circuit |
Use Scenario: Safeguards RS-485 transceivers in outdoor base station backhaul links exposed to induced lightning surges on twisted-pair cabling. IC Role / Device Role: Differential-mode TVS across A/B lines, combined with common-mode chokes, meeting ITU-T K.20/21 secondary protection requirements. Use Value: 70.1 V clamping limits differential overvoltage to within RS-485 receiver common-mode range (±7 V), preserving signal integrity during 1 kV/0.5 µs surges. | Use Scenario: Protects analog front-end inputs of pressure/temperature sensors in HVAC control panels from ESD and relay contact bounce. IC Role / Device Role: Low-capacitance (<100 pF typical) bidirectional clamp on sensor output lines, placed immediately at connector entry point. Use Value: Sub-ns response prevents ESD-induced latch-up in op-amps and ADCs; 43.6 V stand-off avoids interference with 0–10 V or 4–20 mA sensor signal ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | DO-214AA (SMB) package; same 51 V VBR, but lower PPPM = 600 W; higher IPPM = 12.3 A | Suitable for space-constrained PCBs; limited to lower-energy transients (IEC 61000-4-5 Level 2) | Select when board area is critical and surge threat level is moderate; verify thermal relief for SMB footprint. |
| 1.5SMC51CA | DO-214AB (SMC) package; identical 1500 W rating and 51 V VBR; slightly higher VC = 73.5 V at 20.5 A | Offers surface-mount compatibility while matching 1.5KE51CA-E3/73 energy handling | Choose for automated SMT assembly and equivalent surge performance; confirm pad thermal mass matches DO-201AD lead dissipation. |
Compared with 1.5KE51CA-E3/73, SMBJ51CA trades peak power for compactness, while 1.5SMC51CA delivers identical surge robustness in a surface-mount format - enabling direct functional replacement where through-hole mounting is not required.
Availability
1.5KE51CA-E3/73 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom line interfaces, and sensor signal conditioning circuits requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE51CA-E3/73 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting industrial, automotive, and telecom systems where robust, cost-effective, through-hole surge protection is essential.
FAQ
What is the breakdown voltage tolerance of the 1.5KE51CA-E3/73?
The 1.5KE51CA-E3/73 has a specified breakdown voltage range of 48.5 V to 53.6 V at 1.0 mA test current, yielding a ±5.2% tolerance. This tight VBR window ensures predictable clamping behavior across production lots and supports reliable coordination with downstream overvoltage protection circuits. The value is measured per JEDEC standard and confirmed in Vishay's 88301 datasheet revision 09-Aug-2022.
Is the 1.5KE51CA-E3/73 AEC-Q101 qualified?
No, the 1.5KE51CA-E3/73 is not AEC-Q101 qualified. Per Vishay document 88301 (page 1, note), AEC-Q101 qualification applies only to 1.5KE6.8CAHE3_B through 1.5KE220CAHE3_B variants. The 1.5KE51CA-E3/73 carries the commercial-grade E3 suffix and is intended for industrial and general-purpose applications where automotive qualification is not mandated.
What does the "CA" suffix indicate in 1.5KE51CA-E3/73?
The "CA" suffix in 1.5KE51CA-E3/73 denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities, with identical VBR, VC, and IPPM characteristics regardless of voltage polarity. This eliminates the need for polarity-aware placement and makes it ideal for AC lines, differential buses, and floating sensor outputs.
What is the maximum clamping voltage of the 1.5KE51CA-E3/73 under surge conditions?
The maximum clamping voltage (VC) of the 1.5KE51CA-E3/73 is 70.1 V, measured at its peak pulse current (IPPM) of 21.4 A using a 10/1000 µs waveform. This value represents the highest voltage the device allows to appear across protected circuitry during a full-rated surge event and is critical for ensuring downstream components remain within their absolute maximum ratings.
Can the 1.5KE51CA-E3/73 be used in parallel for higher surge current handling?
Yes, the 1.5KE51CA-E3/73 can be used in parallel to increase total surge current capacity, but only with careful design considerations: matched VBR devices (≤5% spread), symmetrical PCB layout, and individual series impedance to ensure current sharing. Vishay's application notes confirm parallel use for enhanced PPPM, though derating and thermal coupling must be evaluated - the 1.5KE51CA-E3/73 itself remains rated at 1500 W per unit.
1.5KE51CA-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- 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):
- 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
1.5KE51CA-E3/73 FAQ
1.How can I place an order for 1.5KE51CA-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51CA-E3/73 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 1.5KE51CA-E3/73 reliable?
The price and inventory of 1.5KE51CA-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51CA-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE51CA-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51CA-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51CA-E3/73?
1.5KE51CA-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51CA-E3/73 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 1.5KE51CA-E3/73?
For technical support, including 1.5KE51CA-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51CA-E3/73 requirements.
6.How does Aetrix verify that 1.5KE51CA-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51CA-E3/73 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 1.5KE51CA-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE51CA-E3/73?
All 1.5KE51CA-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51CA-E3/73, 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 1.5KE51CA-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE51CA-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51CA-E3/73 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
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 …
