My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1N6281AHE3/51
- Part No.:
- 1N6281AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N6281AHE3/51.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N6281AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 27 V breakdown voltage (VBR = 25.7–28.4 V at 1.0 mA), 23.1 V stand-off voltage (VWM), 37.5 V clamping voltage (VC) at 40.0 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the 1N6281AHE3/51 datasheet, 1N6281AHE3/51 pinout, 1N6281AHE3/51 application, or 1N6281AHE3/51 equivalent, this part is evaluated for robust transient suppression in 24 V DC systems, ESD-sensitive analog front-ends, and AEC-Q101-compliant automotive subsystems where fast clamping (<1 ns), low leakage (<1.0 µA), and stable thermal performance up to 175 °C are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at VWM), but switches to low-impedance conduction within <1 ns when transient voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device is rated for 1500 W non-repetitive peak pulse power (10/1000 µs), derated linearly above 25 °C ambient per Fig. 2, and supports 200 A single half-sine surge (8.3 ms). Its 15.4 °C/W junction-to-lead thermal resistance enables effective heat dissipation through PCB copper pours or lead-frame mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - defines precise clamping onset threshold for 24 V nominal systems |
| VWM | 23.1 V - maximum continuous reverse operating voltage without significant leakage |
| VC @ IPPM | 37.5 V at 40.0 A - limits downstream voltage stress during worst-case transients |
| PPPM | 1500 W (10/1000 µs) - sustains high-energy surges common in automotive load-dump or inductive switching |
| IFSM | 200 A (8.3 ms half-sine) - withstands repetitive motor-driver or relay-coil turn-off surges |
| TJ max | +175 °C - enables operation in under-hood automotive or industrial power-conversion environments |
| Leakage @ VWM | <1.0 µA - avoids loading of high-impedance sensor bias networks or battery-monitoring circuits |
Pinout & Package
Package: Case Style 1.5KE - molded epoxy body with matte tin-plated leads; RoHS-compliant and AEC-Q101 qualified (HE3 suffix); 0.375" (9.5 mm) lead length; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest-potential rail; forms cathode-to-anode clamping path |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V supply or CAN_H); color band denotes this end |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %) and long-term reliability under thermal cycling |
| 1500 W peak pulse power | Handles ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave surges without degradation |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor modules |
| Fast response time | <1 ns clamping activation - protects CMOS inputs and precision analog circuitry before damage occurs |
| Low incremental surge resistance | Minimizes VC overshoot during high-di/dt events, improving margin for 3.3 V/5 V logic interfaces |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control modules against load-dump transients (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and chassis ground, activated within nanoseconds upon overvoltage detection. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤37.5 V, preventing latch-up or gate oxide rupture. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Uni-directional clamping element on 0–10 V or 4–20 mA loop lines, referenced to system ground. Use Value: Suppresses ESD (IEC 61000-4-2 ±8 kV contact) and fast transients (IEC 61000-4-4 ±2 kV) without affecting 16-bit ADC accuracy. |
| Telecom Line Card Surge Protection | MOSFET Gate Driver Protection |
Use Scenario: Front-end protection for PoE-powered Ethernet switch line cards exposed to lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Primary TVS on DC input side (48 V rail), coordinated with secondary GDT or MOV stages. Use Value: Clamps induced surges to safe levels before they reach isolated DC/DC controllers, maintaining IEEE 802.3af/at compliance. |
Use Scenario: Protecting high-side N-channel MOSFET gates driven by bootstrap circuits in motor inverters. IC Role / Device Role / Timing Role: Clamp diode across gate-source terminals to suppress Miller-induced voltage spikes during switching transitions. Use Value: Prevents gate oxide breakdown by limiting VGS to ≤37.5 V during dV/dt events, extending MOSFET lifetime in 10 kHz+ PWM applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPPM (400 W), smaller SMA package (vs. DO-201AB), VC = 45.4 V @ 8.8 A | Not AEC-Q101 qualified; suited for space-constrained consumer or computing boards, not under-hood automotive | Select when board area is critical and surge energy is limited to IEC 61000-4-5 Level 2 (0.5 kV) |
| 1.5KE27AHE3_A | Same electrical specs and AEC-Q101 qualification; identical 1.5KE package but different tape-and-reel packaging (base code "A" vs "51") | No functional difference; same design-in suitability for automotive and industrial use cases | Choose based on logistics preference - 1N6281AHE3/51 uses 13" paper tape (1400 pcs/reel), while 1.5KE27AHE3_A may ship in alternate reel formats |
Compared with SMAJ28A, the 1N6281AHE3/51 delivers 3.75× higher surge power handling and automotive-grade reliability; versus 1.5KE27AHE3_A, it offers identical protection performance with verified traceable sourcing via Aetrix's HE3/51-specific procurement channel.
Availability
1N6281AHE3/51 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom line card development requiring stable component supply, AEC-Q101 compliance, and 1500 W transient immunity.
Supply support for 1N6281AHE3/51 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The 1N6281AHE3/51 belongs to Vishay's TRANSZORB® TVS family - engineered specifically for robust, nanosecond-response overvoltage protection in harsh environments where failure is not an option.
FAQ
What is the breakdown voltage tolerance for 1N6281AHE3/51?
The 1N6281AHE3/51 has a specified breakdown voltage range of 25.7 V to 28.4 V at 1.0 mA test current, corresponding to a ±5 % tolerance around the nominal 27 V rating. This tight tolerance ensures consistent clamping behavior across production lots and supports reliable design margins in 24 V system protection schemes.
Is 1N6281AHE3/51 suitable for bi-directional transient suppression?
No, the 1N6281AHE3/51 is a uni-directional TVS diode - its cathode is marked with a color band and it conducts only when reverse-biased beyond VBR. For bi-directional protection, Vishay offers the 1N6281CA variant; using 1N6281AHE3/51 in AC-coupled or floating applications would require external circuitry to ensure correct polarity alignment.
Does 1N6281AHE3/51 meet AEC-Q101 requirements?
Yes, the 1N6281AHE3/51 is explicitly AEC-Q101 qualified per Vishay document 88301, revision 11-Oct-16. The HE3 suffix confirms compliance, including stress testing for temperature cycling, humidity bias, and mechanical shock - making it approved for use in automotive powertrain, chassis, and body electronics systems.
What is the maximum clamping voltage of 1N6281AHE3/51 under surge conditions?
The 1N6281AHE3/51 clamps to a maximum of 37.5 V when subjected to its rated 40.0 A peak pulse current (10/1000 µs waveform). This value is guaranteed across temperature and lifetime, enabling designers to verify that downstream components - such as 40 V-rated MOSFETs or 3.3 V LDOs with sufficient headroom - remain within safe operating limits.
How does the thermal resistance of 1N6281AHE3/51 affect PCB layout?
The 1N6281AHE3/51 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W. To maintain TJ ≤ 175 °C during repeated surges, PCB layout must provide adequate copper area (≥100 mm² per lead) and minimize trace length between the device and ground/power planes - especially critical in high-duty-cycle industrial motor drives.
1N6281AHE3/51 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1N6281AHE3/51 FAQ
1.How can I place an order for 1N6281AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6281AHE3/51 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 1N6281AHE3/51 reliable?
The price and inventory of 1N6281AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6281AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1N6281AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6281AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6281AHE3/51?
1N6281AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6281AHE3/51 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 1N6281AHE3/51?
For technical support, including 1N6281AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6281AHE3/51 requirements.
6.How does Aetrix verify that 1N6281AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1N6281AHE3/51 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 1N6281AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1N6281AHE3/51?
All 1N6281AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6281AHE3/51, 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 1N6281AHE3/51 part is unused and in its original packaging.
Return procedure for 1N6281AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6281AHE3/51 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…
