My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ45AHE3/9AT
- Part No.:
- SMCJ45AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AHE3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,833
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ45AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ45AHE3/9AT datasheet, SMCJ45AHE3/9AT pinout, SMCJ45AHE3/9AT application, or SMCJ45AHE3/9AT equivalent, key selection criteria include clamping performance under 20.6 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with derating applied above TA = 25 °C per Figure 2 in the datasheet.
The SMCJ45AHE3/9AT is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 50.0 V / 55.3 V at IT = 1 mA - ensures reliable avalanche turn-on within tight tolerance band |
| VC @ IPPM | 72.7 V at 20.6 A - limits downstream voltage stress during 1500 W transient events |
| PPPM | 1500 W - sustains high-energy surges typical of ISO 7637-2 Pulse 1/2a/5a in automotive systems |
| TJ max | +150 °C - supports operation in under-hood automotive environments and industrial enclosures |
| RθJA | 75 °C/W - defines thermal rise under 6.5 W steady-state dissipation on standard PCB layout |
| Package | SMC (DO-214AB) - surface-mount outline with 0.305" × 0.220" footprint and cathode band marking |
Pinout & Package
SMCJ45AHE3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case with two terminals, cathode marked by a band on one end. Leads are matte tin-plated and compatible with lead-free reflow profiles up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-referenced clamping node | Connects to protected line; conducts during overvoltage to shunt current to ground |
| Anode (unmarked end) | Reference/ground return path | Must be tied to system ground or low-impedance return plane to enable effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD, load dump) |
| MSL Level 1 rating | Enables direct placement without baking; supports standard J-STD-020 reflow profile |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive assemblies |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 load dump pulses up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach LDOs or microcontrollers. Use Value: Limits peak voltage to ≤72.7 V at 20.6 A, preventing damage to 40 V-rated input stages while surviving repeated 1500 W surges. | Use Scenario: Safeguarding analog outputs of pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) TVS on 0–5 V output lines to suppress EFT bursts and inductive switching noise. Use Value: Clamps transients within nanoseconds without distorting low-bandwidth analog signals, preserving measurement integrity. |
| Telecom DC Power Feeds | Consumer Device USB Port Protection |
Use Scenario: Guarding 48 V PoE-powered network switches against lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Primary-level TVS on DC input stage, coordinated with secondary-side MOVs and gas discharge tubes. Use Value: Absorbs 1500 W energy per event while maintaining VWM = 45 V margin above nominal 48 V rail, enabling robust multi-stage protection. | Use Scenario: Adding surge resilience to USB-C power delivery circuits in portable monitors. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line upstream of USB PD controller to prevent latch-up during hot-plug transients. Use Value: Withstands 20.6 A surge current and clamps to 72.7 V, protecting 20 V-rated PD controllers without compromising USB BC 1.2 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/61T | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W) | Not suitable for automotive load dump; limited to low-energy ESD/EFT scenarios | Select when board space is constrained and surge energy is ≤400 W |
| 1.5KE45A-T | Through-hole DO-201 package, same VWM/VBR/VC specs, lower IPPM (22.2 A) | Requires wave soldering; incompatible with fully SMT production flows | Choose only for legacy through-hole designs or prototyping where rework tolerance is prioritized |
Compared with SMAJ45A-E3/61T and 1.5KE45A-T, the SMCJ45AHE3/9AT delivers 3.75× higher surge power handling in an AEC-Q101-qualified SMT package, enabling single-device compliance with ISO 16750-2 and IEC 61000-4-5 Level 3 in compact automotive and industrial layouts.
Availability
SMCJ45AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and telecom power feed systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMCJ45AHE3/9AT 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, automotive qualification, and high-volume manufacturability.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without sacrificing signal integrity or thermal performance.
FAQ
What is the clamping voltage of SMCJ45AHE3/9AT at its rated peak pulse current?
The SMCJ45AHE3/9AT has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current (IPPM) of 20.6 A using a 10/1000 µs waveform. This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per the datasheet's thermal definition. The SMCJ45AHE3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCJ45AHE3/9AT qualified for automotive applications?
Yes, the SMCJ45AHE3/9AT carries AEC-Q101 qualification, confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101-qualified construction. It is rated for junction temperatures from -55 °C to +150 °C and meets MSL Level 1 per J-STD-020, making it suitable for under-hood and body-control module applications. The SMCJ45AHE3/9AT is explicitly listed in Vishay's AEC-Q101 qualified product table.
What does the "9AT" suffix indicate in SMCJ45AHE3/9AT?
"9AT" is Vishay's preferred package code denoting 13-inch diameter plastic tape-and-reel delivery containing 3500 units per reel. It specifies the packaging format and quantity - distinct from "57T" (7-inch reel, 850 units) and "H"/"I" variants. The SMCJ45AHE3/9AT uses this configuration to support high-volume SMT assembly lines with minimal reel changeovers and verified moisture sensitivity level (MSL) handling.
How does the thermal resistance of SMCJ45AHE3/9AT affect its power handling capability?
The SMCJ45AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout. At ambient temperature (TA = 25 °C), this limits continuous power dissipation (PD) to 6.5 W before reaching the 150 °C maximum junction temperature. For transient events, the 1500 W PPPM rating applies only for short durations (<1 ms); sustained power must remain within the 6.5 W derated limit. The SMCJ45AHE3/9AT's thermal design enables reliable operation in sealed enclosures without forced airflow.
Can SMCJ45AHE3/9AT be used in bidirectional configurations?
No, the SMCJ45AHE3/9AT is a unidirectional TVS diode, indicated by the "A" suffix (as opposed to "CA" for bidirectional versions like SMCJ45CA). Its cathode band marks the polarity-sensitive terminal, and it conducts only when the anode is more negative than the cathode. Using it in reverse-biased AC or differential signal paths would result in unintended conduction or failure. For bidirectional protection, the SMCJ45CAHE3/9AT variant must be selected instead.
SMCJ45AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ45AHE3/9AT FAQ
1.How can I place an order for SMCJ45AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AHE3/9AT 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 SMCJ45AHE3/9AT reliable?
The price and inventory of SMCJ45AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AHE3/9AT?
SMCJ45AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AHE3/9AT 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 SMCJ45AHE3/9AT?
For technical support, including SMCJ45AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ45AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45AHE3/9AT 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 SMCJ45AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45AHE3/9AT?
All SMCJ45AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AHE3/9AT, 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 SMCJ45AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45AHE3/9AT 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 …
