My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5KA27HE3/73
- Part No.:
- 1.5KA27HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA27HE3/73.pdf
- Description:
- TVS DIODE 21.8VWM 39.1VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KA27HE3/73 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 39.1 V under 38.4 A peak pulse current, and operates up to +185 °C junction temperature - enabling robust protection of MOSFETs and sensor signal lines in automotive powertrain control modules.
For engineers reviewing the 1.5KA27HE3/73 datasheet, 1.5KA27HE3/73 pinout, 1.5KA27HE3/73 application, or 1.5KA27HE3/73 equivalent, key selection criteria include its AEC-Q101 qualification, 24.3–29.7 V breakdown range, low 0.096 %/°C VBR tempco, and HE3 suffix compliance with JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repetitive surge stress and maintains performance across -65 °C to +185 °C operating range. Its unidirectional polarity and 21.8 V stand-off voltage (VWM) support DC-biased protection circuits where reverse leakage must remain ≤1 µA at TJ = 150 °C.
The device sustains 200 A non-repetitive forward surge (8.3 ms half-sine) and exhibits 3.5 V max forward voltage at 100 A, confirming suitability for high-current inductive load switching transients. Its molded epoxy case meets UL 94 V-0 and RoHS/WEEE compliance, with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - withstands high-energy automotive load dump and ISO 7637-2 pulse 5a transients |
| Breakdown Voltage VBR | 24.3–29.7 V at 1 mA - defines precise clamping onset for 24 V system overvoltage protection |
| Clamping Voltage VC | 39.1 V at 38.4 A - limits protected circuit voltage during worst-case surge, preserving downstream ICs |
| Stand-off Voltage VWM | 21.8 V - ensures no conduction during normal 24 V rail operation, minimizing standby leakage |
| Junction Temperature Range | -65 °C to +185 °C - supports under-hood placement in engine control units and transmission modules |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including temperature cycling, HTRB, and ESD testing |
| HE3 Suffix Compliance | JESD201 Class 2 whisker resistance - prevents tin whisker growth in long-life automotive applications |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded, molded epoxy body (UL 94 V-0), 0.375" (9.5 mm) lead length, 0.210" (5.3 mm) body diameter. Cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return in unidirectional TVS configuration |
| Cathode | Protected line connection / Clamping node | Connected to line being protected (e.g., 24 V supply rail or sensor output); color-banded end |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables stable VBR and low dynamic impedance across 1000+ surge events without parameter drift |
| 1500 W peak pulse rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a requirements for 24 V automotive systems with ≥200 V test levels |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity |
| AEC-Q101 qualified & HE3 whisker-resistant | Validated for 15-year automotive service life with zero field failures due to tin whiskers or parametric shift |
| 185 °C max junction temperature | Permits direct mounting near heat sources (e.g., power relays, ignition coils) without derating |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs and CAN transceiver power rails against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed upstream of LDO regulators and CAN bus interfaces. Use Value: Limits transient voltage to ≤39.1 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and transceivers. |
Use Scenario: Safeguarding analog input channels (4–20 mA, 0–10 V) from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression on terminal blocks before signal conditioning amplifiers. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5 Level 3, maintaining measurement accuracy over 10+ years. |
| Automotive Body Control Module (BCM) | Telecom Power Supply Input |
Use Scenario: Shielding LIN bus transceivers and window motor drivers from battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1.5KA27HE3/73 used with series fuse for cost-optimized design. Use Value: Clamps 24 V rail to safe level within 1 ns, avoiding false resets in microcontrollers and driver ICs. |
Use Scenario: Front-end surge protection for AC/DC power supplies feeding base station radios and remote PHY units. IC Role / Device Role / Timing Role: First-stage clamping ahead of MOVs and filter inductors in telecom-grade power entry modules. Use Value: Provides precise 21.8 V stand-off and low leakage (<1 µA @ 150 °C), reducing standby power loss in always-on equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24AHE3/52 | Lower PPPM (600 W), smaller SMB package (vs. axial 1.5KA), 24 V nominal VBR (21.6–26.4 V) | Better suited for PCB space-constrained designs; lower energy handling limits use to sub-ISO 7637-2 Pulse 1/2 scenarios | Select when board area is critical and surge threat level is ≤600 W; verify thermal relief for continuous 6.5 W dissipation. |
| 1.5KE27A | Same VBR range (24.3–29.7 V) but non-automotive grade, no AEC-Q101, no HE3 whisker test, 175 °C TJ max | Limited to industrial/commercial use; not qualified for automotive under-hood deployment or long-term reliability validation | Acceptable for cost-sensitive non-automotive applications where 185 °C operation and whisker resistance are not required. |
Compared with SMBJ24AHE3/52 and 1.5KE27A, the 1.5KA27HE3/73 uniquely combines AEC-Q101 qualification, 185 °C operation, and 1500 W pulse capability in an axial package - making it the only choice for high-reliability 24 V automotive power rail protection where thermal margin and field lifetime are non-negotiable.
Availability
1.5KA27HE3/73 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom power supply input stages requiring stable component supply, long-lifecycle assurance, and AEC-Q101-compliant surge immunity.
Supply support for 1.5KA27HE3/73 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 1.5KA family was engineered specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive systems, emphasizing thermal stability, surge endurance, and long-term parametric consistency under temperature cycling.
FAQ
What is the breakdown voltage range of the 1.5KA27HE3/73?
The 1.5KA27HE3/73 has a guaranteed breakdown voltage (VBR) range of 24.3 V to 29.7 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures reliable clamping onset for 24 V nominal systems while accommodating manufacturing tolerances and temperature drift - a key requirement for automotive-grade surge protection where consistent threshold behavior is critical across temperature and lifetime.
Is the 1.5KA27HE3/73 suitable for bidirectional transient protection?
No, the 1.5KA27HE3/73 is unidirectional only, as explicitly stated in the Vishay datasheet Document Number 88300. Its internal structure and polarity marking (cathode band) support clamping only in reverse bias. For bidirectional protection, a pair of 1.5KA27HE3/73 devices in series-opposing configuration or a dedicated bidirectional TVS such as SMAJ24A would be required - but neither provides the same AEC-Q101 qualification or 1500 W rating as the 1.5KA27HE3/73.
What does the HE3 suffix indicate on the 1.5KA27HE3/73?
The HE3 suffix on the 1.5KA27HE3/73 denotes RoHS-compliant, high-reliability/automotive-grade construction meeting JESD201 Class 2 whisker resistance requirements. It confirms the device uses matte tin plating qualified for long-term storage and operation without tin whisker growth - a mandatory specification for automotive under-hood applications where field failure due to metallurgical defects is unacceptable. The HE3 suffix also signals AEC-Q101 qualification.
How does the 1.5KA27HE3/73 perform at elevated temperatures?
The 1.5KA27HE3/73 maintains full functionality up to +185 °C junction temperature, with VBR exhibiting only 0.096 %/°C temperature coefficient. At 150 °C, reverse leakage remains ≤1 µA at VWM = 21.8 V - ensuring minimal power loss and stable clamping in engine bay or powertrain control modules. Derating curves (Fig. 2 and Fig. 5 in datasheet 88300) confirm usable pulse power down to 70 % of rated 1500 W at 125 °C ambient.
Can the 1.5KA27HE3/73 replace the 1.5KE27A in existing designs?
The 1.5KA27HE3/73 is not a drop-in replacement for the 1.5KE27A due to differences in qualification and thermal rating: while both share identical VBR and package outline, the 1.5KA27HE3/73 is AEC-Q101 qualified, rated for 185 °C operation (vs. 175 °C), and passes JESD201 Class 2 whisker testing. Substitution requires validation of thermal layout and reliability testing - especially for automotive applications where the 1.5KE27A lacks required qualification.
1.5KA27HE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 21.8V
- Voltage - Breakdown (Min):
- 24.3V
- Voltage - Clamping (Max) @ Ipp:
- 39.1V
- Current - Peak Pulse (10/1000µs):
- 38.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KA
1.5KA27HE3/73 FAQ
1.How can I place an order for 1.5KA27HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA27HE3/73 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 1.5KA27HE3/73 reliable?
The price and inventory of 1.5KA27HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA27HE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KA27HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA27HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA27HE3/73?
1.5KA27HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA27HE3/73 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 1.5KA27HE3/73?
For technical support, including 1.5KA27HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA27HE3/73 requirements.
6.How does Aetrix verify that 1.5KA27HE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA27HE3/73 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 1.5KA27HE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA27HE3/73?
All 1.5KA27HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA27HE3/73, 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 1.5KA27HE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA27HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA27HE3/73 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 …
