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Vishay General Semiconductor - Diodes Division SMCJ28CAHM3_A/H
- Part No.:
- SMCJ28CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CAHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
SMCJ28CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for clamping voltage transients on signal or power lines. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps to ≤45.4 V at 33 A peak surge current. It is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SMCJ28CAHM3_A/H datasheet, SMCJ28CAHM3_A/H pinout, SMCJ28CAHM3_A/H application, or SMCJ28CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, AEC-Q101 qualification, SMC package thermal performance (RθJA = 75 °C/W), and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche diode structure, responding within picoseconds to transient overvoltages. Its bidirectional symmetry ensures identical clamping behavior in both polarities, with low incremental surge resistance enabling stable voltage limiting under high-current surges up to 33 A (10/1000 µs).
Thermally, it sustains operation from −55 °C to +150 °C junction temperature, with RθJL = 15 °C/W enabling effective heat transfer to PCB copper. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 whisker resistance Class 2 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | ≤45.4 V at 33 A - Clamped voltage under full 1500 W surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 1500 W (10/1000 µs waveform) - Peak transient energy handling capacity; supports robust protection against lightning-induced or inductive-switching spikes. |
| IR @ VWM | ≤1.0 µA - Ultra-low leakage at rated standoff voltage; prevents signal distortion or power loss in high-impedance sensor or communication lines. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive environments and industrial enclosures without derating. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm lead spacing; compatible with IPC-7351B footprint and reflow profiles up to 260 °C peak. |
Pinout & Package
SMCJ28CAHM3_A/H uses the SMC (DO-214AB) package: a symmetrical, bidirectional surface-mount device with no polarity marking. Both terminals are electrically identical; neither is designated anode or cathode. The package features a low-profile profile (max height 2.90 mm), matte tin-plated leads, and meets UL 94 V-0 flammability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Bidirectional connection point - accepts overvoltage from either direction; connects across protected line (e.g., CAN_H/CAN_L, RS-485 A/B, or DC bus). |
| Terminal 2 | Transient input/output node | Electrically identical to Terminal 1 - completes the bidirectional clamping path; requires symmetric PCB layout for balanced ESD/transient response. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables direct use in ADAS, infotainment, and body control modules without additional qualification. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1 - supports green manufacturing, lead-free reflow, and long-term regulatory compliance for global OEM programs. |
| 1500 W peak pulse power | Handles 33 A surge current (10/1000 µs) while clamping below 45.4 V - protects sensitive 3.3 V or 5 V logic interfaces and 24 V power rails against ISO 7637-2 Pulse 1/2/5a/b and IEC 61000-4-5 surges. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Ratio of 45.4 V / 33.3 V (typical VBR) indicates minimal voltage overshoot during clamping - reduces risk of latch-up or gate oxide damage in connected MOSFETs or microcontrollers. |
| Glass-passivated junction | Stable, repeatable avalanche characteristics over lifetime - ensures consistent clamping voltage and leakage performance after >1000 surge events per JEDEC JESD22-A115. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) and body electronics against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and ground, absorbing transients before they reach LDOs or MCU power pins. Use Value: Withstands 1500 W surges and maintains ≤45.4 V clamping, preventing brownout resets and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital sensor buses (I²C, SPI) in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) TVS shunting fast ESD events (IEC 61000-4-2 ±8 kV contact) on signal lines without loading the source. Use Value: Sub-46 V clamping preserves signal integrity for 3.3 V ADC references and avoids false triggering in precision measurement circuits. |
| Telecom Data Line Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links exposed to induced lightning surges per IEC 61000-4-5 Level 3 (2 kV line-earth). IC Role / Device Role / Timing Role: Bidirectional TVS mounted differential across A/B lines, providing common-mode and differential-mode transient suppression. Use Value: Symmetric clamping ensures equal voltage limiting on both lines, maintaining receiver common-mode rejection and preventing data corruption. |
Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D− lines behind integrated port protectors in smart home hubs and docking stations. IC Role / Device Role / Timing Role: Fast-response (sub-ns) clamping element that activates before internal transceiver ESD structures, reducing cumulative stress. Use Value: 1500 W rating absorbs multiple high-energy discharges, extending product field life beyond 10,000 plug/unplug cycles per USB-IF test plan. |
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/H | Lower PPPM (400 W), same VWM/VBR range, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients (e.g., board-level ESD only); unsuitable for ISO 7637-2 or IEC 61000-4-5 line surges | Select when space-constrained layouts prioritize size over surge robustness and thermal margin is sufficient. |
| SMCJ28AHE3_A/H | Unidirectional version; includes cathode band marking; identical VWM/VBR/PPPM but asymmetric conduction | Requires correct polarity placement; not usable on AC-coupled or floating differential lines like CAN or RS-485 | Choose only for DC power rail protection where polarity is fixed and ground-referenced clamping suffices. |
Compared with SMAJ28CAHE3_A/H and SMCJ28AHE3_A/H, SMCJ28CAHM3_A/H uniquely combines 1500 W surge capability, bidirectional symmetry, AEC-Q101 qualification, and halogen-free construction - making it the only option qualified for high-reliability automotive power-line and industrial fieldbus protection without design compromise.
Availability
SMCJ28CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom data interfaces, and consumer USB host designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ28CAHM3_A/H 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed to deliver high-power, surface-mount transient protection for harsh-environment applications - particularly automotive, industrial, and telecom systems demanding AEC-Q101 qualification and 1500 W surge immunity.
FAQ
What is the clamping voltage of SMCJ28CAHM3_A/H at its rated peak pulse current?
The SMCJ28CAHM3_A/H clamps to a maximum of 45.4 V when subjected to its peak pulse current of 33 A (10/1000 µs waveform). This value is measured under standardized test conditions with 0.31" × 0.31" copper pads per terminal and represents the upper limit of voltage seen by protected circuitry during worst-case surge events. The actual clamping voltage of SMCJ28CAHM3_A/H may be lower depending on PCB layout and thermal conditions.
Is SMCJ28CAHM3_A/H suitable for automotive applications?
Yes, SMCJ28CAHM3_A/H is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensors. Its halogen-free, RoHS-compliant construction, 1500 W surge rating, and −55 °C to +150 °C operating range meet stringent OEM requirements. The SMCJ28CAHM3_A/H has passed stress tests including temperature cycling, HTRB, and ESD per AEC-Q101 Rev G.
How does the bidirectional design of SMCJ28CAHM3_A/H affect its circuit implementation?
The bidirectional design of SMCJ28CAHM3_A/H eliminates polarity concerns - it can be placed across any two points needing transient suppression regardless of DC bias direction. This makes SMCJ28CAHM3_A/H ideal for AC-coupled lines (e.g., CAN, RS-485, audio), floating sensors, or dual-rail supplies. Unlike unidirectional variants, SMCJ28CAHM3_A/H requires no cathode marking or orientation verification during placement.
What is the thermal resistance of SMCJ28CAHM3_A/H, and how does it impact PCB layout?
SMCJ28CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain reliability under repeated surges, PCB layout must replicate this minimum pad area and ensure adequate copper pour. Reducing pad size increases RθJA, raising junction temperature and potentially degrading clamping consistency or shortening device life.
Does SMCJ28CAHM3_A/H have any special soldering or reflow requirements?
SMCJ28CAHM3_A/H is rated for MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102, enabling standard lead-free reflow profiles. No pre-baking is required. The SMCJ28CAHM3_A/H package is compatible with automated pick-and-place and wave soldering when used with appropriate stencil apertures and thermal profiling.
SMCJ28CAHM3_A/H 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/H FAQ
1.How can I place an order for SMCJ28CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CAHM3_A/H 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/H reliable?
The price and inventory of SMCJ28CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMCJ28CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CAHM3_A/H?
SMCJ28CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CAHM3_A/H 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/H?
For technical support, including SMCJ28CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ28CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ28CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMCJ28CAHM3_A/H?
All SMCJ28CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMCJ28CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CAHM3_A/H Tags
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