My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCG28AHE3/9AT
- Part No.:
- SMCG28AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG28AHE3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCG28AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power line and sensor interface protection.
For engineers reviewing the SMCG28AHE3/9AT datasheet, SMCG28AHE3/9AT pinout, SMCG28AHE3/9AT application, or SMCG28AHE3/9AT equivalent, this AEC-Q101 qualified device offers verified clamping performance, low incremental surge resistance, and RoHS-compliant matte tin-plated leads suitable for high-reliability industrial and automotive PCB designs requiring stable transient suppression under repetitive surge stress.
Technical Context
The SMCG28AHE3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and precise voltage threshold control. Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W enabling effective heat dissipation on standard 8.0 mm × 8.0 mm copper pads.
It complies with ANSI/IEEE C62.35 standards for surge protectors and meets JESD201 Class 2 whisker resistance. The device is rated for -55 °C to +150 °C operating junction temperature and qualifies per AEC-Q101 for automotive under-hood applications - confirming its suitability for 12 V and 24 V system rail protection where IFSM = 200 A (8.3 ms half-sine) and ID ≤ 1.0 µA at VWM is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on during transients without premature leakage. |
| VC @ IPPM | 45.4 V at 33.0 A - clamping voltage limits downstream IC stress during 1500 W surge events, critical for MOSFET gate and MCU I/O protection. |
| PPPM | 1500 W - peak pulse power rating with 10/1000 µs waveform; supports high-energy lightning-induced surges in automotive CAN/LIN lines. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on automotive modules. |
| TJ max. | +150 °C - extended junction temperature rating enables placement near hot components like power converters without derating. |
| IFSM | 200 A - non-repetitive forward surge rating allows survival of motor-commutation spikes in brushed DC actuator circuits. |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile surface-mount case with matte tin-plated leads, UL 94 V-0 molding compound, and MSL Level 1 moisture sensitivity (peak reflow 260 °C). Cathode identified by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to protected circuit ground or low-side reference; completes clamping loop during positive transients. |
| Cathode | Reverse-biased terminal / surge shunt node | Connected to protected line (e.g., 24 V rail); conducts avalanche current when voltage exceeds VBR, diverting energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to environmental contamination, critical for long-term reliability in harsh industrial environments. |
| Low incremental surge resistance | Minimizes VC rise under high di/dt conditions, maintaining tighter clamping than silicon carbide alternatives in <100 ns transients. |
| MSL Level 1 rating | Enables standard SMT reflow without baking; compatible with high-volume automated assembly using JEDEC-standard 260 °C peak profile. |
| RoHS-compliant HE3 suffix | Meets EU RoHS Directive 2011/65/EU and Vishay material categorization per doc. 99912; no exemptions required for lead-free manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges up to ISO 7637-2 Pulse 5a. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to downstream PMICs and microcontrollers rated for 36 V absolute maximum. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-leakage TVS mounted at connector entry point to absorb fast-rising transients before reaching precision DAC or op-amp stages. Use Value: Maintains signal fidelity with ≤1.0 µA leakage at 28 V, avoiding offset errors in µA-level current-loop measurements. |
| Telecom Line Card Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding Ethernet PHY power pins and data lines in outdoor telecom base stations exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on 3.3 V/5 V auxiliary rails, coordinated with secondary GDT or polymer PTC for staged protection. Use Value: Delivers 1500 W peak power handling with 45.4 V clamping, reducing risk of latch-up in Ethernet switch controllers during Category 3 surge events. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., robotic vacuum cleaners). IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp commutation spikes before they couple into MCU GPIO or power management ICs. Use Value: Withstands 200 A single-half-sine surge (IFSM), ensuring survivability during repeated motor stall events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Same VWM (28 V) and VC (45.4 V), but lower PPPM (400 W) and smaller SMA package (DO-214AC); RθJA = 110 °C/W vs. 75 °C/W. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or high-current inductive loads. | Select when board space is constrained and surge energy is ≤400 W; verify thermal margin with layout simulation. |
| SMCJ28AHE3/9AT | Identical electrical specs (VWM, VBR, VC, PPPM) and AEC-Q101 qualification, but larger SMC (DO-214AB) package with higher IFSM (400 A) and RθJA = 50 °C/W. | Better thermal performance and surge endurance; preferred for high-reliability 24 V systems with frequent motor switching. | Choose for enhanced robustness where PCB real estate permits; requires revised footprint and stencil design. |
Compared with SMAJ28A-E3/57T, SMCG28AHE3/9AT delivers 275 % higher surge power handling and superior thermal management; versus SMCJ28AHE3/9AT, it trades 25 % lower IFSM for 30 % smaller footprint - making it optimal for space-constrained AEC-Q101 designs needing full 1500 W capability.
Availability
SMCG28AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom line cards, and consumer appliance motor drives requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMCG28AHE3/9AT 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, efficiency, and automotive-grade qualification.
The SMCG series was engineered specifically for high-power transient suppression in space-constrained automotive and industrial applications, combining DO-215AB mechanical robustness with AEC-Q101 validation and industry-leading clamping consistency.
FAQ
What is the clamping voltage of SMCG28AHE3/9AT at its rated peak pulse current?
The SMCG28AHE3/9AT has a maximum clamping voltage (VC) of 45.4 V at 33.0 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - a key parameter for ensuring downstream ICs remain within their absolute maximum ratings. The SMCG28AHE3/9AT achieves this with low incremental surge resistance, minimizing voltage overshoot during fast transients.
Is SMCG28AHE3/9AT suitable for automotive applications?
Yes, SMCG28AHE3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments with operating temperatures from -55 °C to +150 °C. Its HE3 suffix denotes RoHS compliance and AEC-Q101 qualification per Vishay's material categorization (doc. 99912), and its 200 A IFSM rating supports survival of load-dump and motor-commutation events common in 12 V/24 V vehicle systems. The SMCG28AHE3/9AT is widely deployed in ECUs, body control modules, and ADAS sensor interfaces.
What does the "HE3/9AT" suffix mean in SMCG28AHE3/9AT?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification, while "9AT" specifies packaging in 13-inch diameter plastic tape and reel with 3500 units per reel. This differs from "57T" (7-inch reel, 850 units) and confirms the part meets Vishay's industrial-grade reliability standards with matte tin-plated leads compliant to J-STD-002 and JESD22-B102. The SMCG28AHE3/9AT is not halogen-free - that designation requires "HM3" suffix instead.
How does SMCG28AHE3/9AT compare to bidirectional variants like SMCG28CA?
SMCG28AHE3/9AT is unidirectional with cathode-band polarity marking and forward conduction capability, whereas SMCG28CA is bidirectional with symmetrical clamping in both directions and no polarity marking. The SMCG28AHE3/9AT supports DC-coupled protection on positive rails (e.g., 24 V supply), while SMCG28CA suits AC-coupled or differential signal lines like RS-485. Both share identical VWM (28 V), VBR (31.1–34.4 V), and VC (45.4 V), but only the unidirectional SMCG28AHE3/9AT specifies IFSM = 200 A.
What PCB pad layout is recommended for optimal thermal performance of SMCG28AHE3/9AT?
Vishay specifies mounting SMCG28AHE3/9AT on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated PPPM and thermal resistance (RθJA = 75 °C/W). Smaller pads increase junction temperature and reduce surge capability - e.g., halving pad area may raise RθJA by >20 °C/W and derate PPPM by ~30 %. The SMCG28AHE3/9AT datasheet Figure 2 provides exact derating curves; thermal vias under pads further improve RθJL (15 °C/W typical) in multilayer boards.
SMCG28AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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 (SMCG)
SMCG28AHE3/9AT FAQ
1.How can I place an order for SMCG28AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG28AHE3/9AT 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 SMCG28AHE3/9AT reliable?
The price and inventory of SMCG28AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG28AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG28AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG28AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG28AHE3/9AT?
SMCG28AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG28AHE3/9AT 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 SMCG28AHE3/9AT?
For technical support, including SMCG28AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG28AHE3/9AT requirements.
6.How does Aetrix verify that SMCG28AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG28AHE3/9AT 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 SMCG28AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG28AHE3/9AT?
All SMCG28AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG28AHE3/9AT, 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 SMCG28AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG28AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG28AHE3/9AT 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 …
