My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ28CAHM3_A/I
- Part No.:
- SMCJ28CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CAHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,310
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ28CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 45.4 V maximum clamping voltage at 33.0 A peak pulse current and 28 V stand-off voltage. It protects sensitive signal lines and power rails in automotive sensor units, industrial I/O interfaces, and telecom surge-prone circuits.
For engineers reviewing the SMCJ28CAHM3_A/I datasheet, SMCJ28CAHM3_A/I pinout, SMCJ28CAHM3_A/I application, or SMCJ28CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W PPPM rating, 28 V VWM, and halogen-free RoHS-compliant construction per HM3 suffix.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional behavior enabling protection on AC-coupled or floating signal paths. Its 1500 W peak pulse power rating (10/1000 µs waveform) and low incremental surge resistance ensure robust transient energy absorption without degradation under repeated surges.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from -55 °C to +150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - validated for automotive-grade reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuit. |
| VBR min/max | 31.1 V / 34.4 V - Breakdown voltage range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 45.4 V - Clamping voltage at 33.0 A peak pulse current; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 1500 W - Peak pulse power dissipation (10/1000 µs waveform); quantifies surge energy handling capacity. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint per terminal. |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements including HTOL, TC, UHST, and ESD. |
Pinout & Package
SMCJ28CAHM3_A/I uses the SMC (DO-214AB) package: molded plastic case with two coplanar matte tin-plated leads, MSL Level 1 compliant, UL 94 V-0 rated, and optimized for automated placement. Bidirectional configuration means no polarity marking; both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Accepts surge current during positive voltage excursion; clamps to VC when V > VBR. |
| Cathode | Transient current entry (negative half-cycle) | Accepts surge current during negative voltage excursion; symmetric clamping ensures equal protection in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating nodes without external polarity constraints. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) on properly laid out PCBs with 8 mm² copper pads. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics requiring long-term field reliability. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with environmental regulations and eliminates corrosive halogen emissions during soldering or end-of-life processing. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices, improving system-level surge margin. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers and MEMS pressure/temperature sensors exposed to load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage clamping element placed directly at connector entry point to shunt transients before reaching signal conditioning ICs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs during 12 V/24 V system load dump events (up to 35 V, 400 ms). | Use Scenario: Safeguarding RS-485/RS-422 transceivers and PLC analog input channels against lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Primary transient suppressor mounted adjacent to connector, coordinated with GDT or MOV for multi-stage protection architecture. Use Value: Limits induced voltage to ≤45.4 V during 10/1000 µs surges, keeping protected transceiver within absolute maximum ratings and avoiding data corruption. |
| Telecom Line Protection | Power Supply Input Stage |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from EFT/burst and surge events on outdoor telecom links. IC Role / Device Role / Timing Role: Fast-response clamping device placed before common-mode chokes to absorb differential-mode transients. Use Value: Responds in <1 ps to clamp transients before they propagate into transformer windings, preserving isolation integrity and preventing core saturation. | Use Scenario: Secondary-side overvoltage suppression on 24 V DC input rails feeding FPGA or microcontroller power domains. IC Role / Device Role / Timing Role: Standoff-rated protector that remains non-conductive during normal operation but activates instantly during input overvoltage faults. Use Value: Maintains 28 V VWM margin above nominal rail while clamping fault conditions to 45.4 V, allowing downstream LDOs or DC-DC controllers to remain functional. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CAHE3_A/I | Lower PPPM (400 W), same VWM/VC, SMA package (smaller thermal mass) | Suitable only for lower-energy transients (IEC 61000-4-4 Level 3), not recommended for automotive load dump | Select when space-constrained and surge threat level is limited to EFT/burst, not full lightning/surge standards. |
| SMCJ28AHE3_A/I | Unidirectional version; cathode band marking; identical VWM, VBR, VC, PPPM | Requires correct polarity orientation; unsuitable for AC or floating signals where bidirectional clamping is mandatory | Choose only for DC-biased rails with known polarity; avoid in differential or AC-coupled signal paths. |
Compared with SMCJ28CAHM3_A/I, SMAJ28CAHE3_A/I offers reduced surge handling in a smaller footprint, while SMCJ28AHE3_A/I provides identical clamping performance but requires strict polarity alignment - making the original bidirectional, AEC-Q101-qualified, halogen-free SMCJ28CAHM3_A/I optimal for automotive and industrial AC-coupled protection.
Availability
SMCJ28CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line surge suppression requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMCJ28CAHM3_A/I 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 application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in demanding environments, targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 validation, and precise clamping performance are critical.
FAQ
What is the clamping voltage of SMCJ28CAHM3_A/I at its rated peak pulse current?
The SMCJ28CAHM3_A/I has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 33.0 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across the operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ28CAHM3_A/I maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMCJ28CAHM3_A/I suitable for automotive applications?
Yes, SMCJ28CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets stress test requirements including high-temperature operating life, temperature cycling, and ESD robustness. The SMCJ28CAHM3_A/I is specifically intended for protecting engine control units, ADAS sensors, and body electronics exposed to load-dump and ISO 7637-2 transients.
How does the bidirectional design of SMCJ28CAHM3_A/I affect its circuit implementation?
The bidirectional design of SMCJ28CAHM3_A/I eliminates polarity sensitivity, allowing it to be placed across any two points needing symmetrical overvoltage protection - such as differential signal pairs, AC-coupled lines, or floating grounds. Unlike unidirectional TVS diodes, the SMCJ28CAHM3_A/I requires no cathode band orientation check during placement, simplifying layout and reducing assembly errors in high-reliability designs.
What is the thermal resistance of SMCJ28CAHM3_A/I, and how does it impact PCB layout?
The SMCJ28CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To achieve rated power dissipation, the datasheet specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Deviating from this layout reduces surge capability; the SMCJ28CAHM3_A/I must be placed with adequate copper area and minimal trace length to maintain thermal integrity during repetitive surges.
Does SMCJ28CAHM3_A/I have a specified junction capacitance value?
No junction capacitance (CJ) value is specified for SMCJ28CAHM3_A/I in the official Vishay datasheet (Document Number: 88394). While typical curves for unidirectional variants show capacitance vs. reverse bias (e.g., ~1000 pF at 0 V for SMCJ28A), bidirectional devices like the SMCJ28CAHM3_A/I lack published CJ data. For high-speed signal line protection, designers should verify impedance impact empirically or select TVS devices with documented CJ if bandwidth is critical.
SMCJ28CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ28CAHM3_A/I FAQ
1.How can I place an order for SMCJ28CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CAHM3_A/I 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 SMCJ28CAHM3_A/I reliable?
The price and inventory of SMCJ28CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ28CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CAHM3_A/I?
SMCJ28CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CAHM3_A/I 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 SMCJ28CAHM3_A/I?
For technical support, including SMCJ28CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ28CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ28CAHM3_A/I 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 SMCJ28CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ28CAHM3_A/I?
All SMCJ28CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CAHM3_A/I, 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 SMCJ28CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ28CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CAHM3_A/I 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 …
