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Vishay General Semiconductor - Diodes Division SMCJ45CAHM3/H
- Part No.:
- SMCJ45CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAHM3/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,838
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Product details
Overview
SMCJ45CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 45 V stand-off voltage (VWM), 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 across automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ45CAHM3/H datasheet, SMCJ45CAHM3/H pinout, SMCJ45CAHM3/H application, or SMCJ45CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), junction temperature derating above 25 °C, and thermal resistance (RθJA = 75 °C/W) under standard pad layout.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding VWM = 45 V, it avalanches symmetrically in both directions to clamp voltage at ≤72.7 V while diverting surge current up to 20.6 A (10/1000 µs). Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed for automated SMT assembly, it meets MSL level 1 per J-STD-020 (peak reflow 260 °C), has matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and supports operation from −55 °C to +150 °C junction temperature - critical for under-hood automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 50.0 V / 55.3 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 72.7 V - Clamped voltage at 20.6 A peak pulse current; determines protected circuit's maximum transient exposure |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 µs waveform; defines surge energy absorption capacity |
| IPPM | 20.6 A - Peak pulse current corresponding to VC; used to size PCB trace and grounding paths |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal design margin for high-ambient applications |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; guides heatsinking requirements |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetrical cathode/anode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | One end of the symmetrical avalanche junction; connects to protected line or ground reference |
| Terminal 2 | Cathode (bidirectional) | Other end of the symmetrical avalanche junction; completes shunt path to ground or return rail |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables use in ADAS sensors and body control modules |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates without compromising surge performance or solderability |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 22.7 V) and faster energy dissipation during fast transients |
| MSL Level 1 rating | Supports standard lead-free reflow profiles up to 260 °C peak without preconditioning - simplifies manufacturing |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current under thermal stress and humidity |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus signal lines and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in engine compartments. IC Role / Device Role / Timing Role: Bidirectional shunt TVS device placed between signal line and chassis ground to clamp ±72.7 V surges within nanoseconds. Use Value: Prevents damage to MCU input pins and analog front-end ICs by limiting transient voltage below absolute maximum ratings - validated per ISO 7637-2 Pulse 1/2/5a. | Use Scenario: Safeguarding digital and analog inputs/outputs of programmable logic controllers against ESD, lightning-induced surges, and relay contact bounce in factory automation systems. IC Role / Device Role / Timing Role: Standoff-rated (45 V) bidirectional suppressor installed at connector entry points to absorb 1500 W surges without degradation. Use Value: Maintains signal integrity during 8/20 µs surge events up to 20.6 A while exhibiting <1 µA leakage at 45 V - minimizing impact on high-impedance measurement circuits. |
| Telecom Interface Protection | Consumer Power Adapter Input Protection |
Use Scenario: Shielding Ethernet PHY interfaces, RS-485 transceivers, and PoE injectors from induced surges on outdoor cabling or shared power/data lines. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) bidirectional TVS placed differential-mode across data pairs and common-mode to ground. Use Value: Clamps common-mode transients to ≤72.7 V while preserving signal bandwidth (low junction capacitance <100 pF at 0 V bias) - compliant with IEC 61000-4-5 Level 3. | Use Scenario: Front-end protection of AC-DC adapter secondary-side outputs against back-EMF from connected devices and hot-plug events. IC Role / Device Role / Timing Role: Secondary-side TVS mounted between regulated DC output and ground to suppress 1500 W surges from downstream capacitive loads. Use Value: Enables compact, cost-effective protection without external series impedance - leverages 45 V VWM to avoid conduction during normal 3.3–48 V output regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Not suitable for >400 W surge environments; limited to low-energy consumer interfaces | Select when board space is constrained and surge threat level is ≤400 W (e.g., USB port protection) |
| SMCJ45CAHE3_A/H | Same electrical specs, but RoHS-compliant commercial grade (E3) - not AEC-Q101 qualified or halogen-free | Lacks automotive qualification and halogen-free certification; unsuitable for Tier-1 automotive BOMs | Select for cost-sensitive industrial applications where AEC-Q101 and halogen-free are not mandated |
Compared with SMCJ45CAHM3/H, SMAJ45CA-E3/57T offers reduced surge capacity and thermal performance in a smaller footprint, while SMCJ45CAHE3_A/H provides identical clamping behavior without automotive qualification or halogen-free materials - making SMCJ45CAHM3/H the only option meeting full AEC-Q101 + halogen-free + 1500 W requirements.
Availability
SMCJ45CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom interface surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMCJ45CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 compliance, and precise clamping performance are mandatory.
FAQ
What does the "HM3" suffix indicate in SMCJ45CAHM3/H?
The "HM3" suffix in SMCJ45CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards, absence of brominated flame retardants, and suitability for lead-free reflow (MSL Level 1, 260 °C peak). This distinguishes SMCJ45CAHM3/H from non-automotive variants like SMCJ45CA-E3/57T or SMCJ45CAHE3_A/H.
Is SMCJ45CAHM3/H bidirectional, and how does that affect its placement in circuit design?
Yes, SMCJ45CAHM3/H is a bidirectional TVS diode - meaning it clamps voltage symmetrically in both polarities without polarity marking. This allows direct placement across any two nodes requiring protection (e.g., differential signal pair or single-ended line to ground) without orientation concerns. Its bidirectional nature eliminates risk of incorrect installation during automated assembly and ensures consistent response to positive or negative transients.
What is the maximum clamping voltage of SMCJ45CAHM3/H, and under what test condition is it specified?
The maximum clamping voltage of SMCJ45CAHM3/H is 72.7 V, measured at 20.6 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential surge waveform. This value represents the upper limit of voltage seen by downstream circuitry during worst-case transient events and is critical for ensuring protected ICs remain within their absolute maximum voltage ratings.
Can SMCJ45CAHM3/H be used in place of unidirectional TVS diodes like SMCJ45A in the same PCB layout?
No - SMCJ45CAHM3/H is bidirectional and lacks a cathode band marking, whereas unidirectional SMCJ45A requires correct polarity alignment (band to cathode). Substituting SMCJ45CAHM3/H for SMCJ45A may cause unintended conduction in DC-biased circuits. Layouts must be verified: bidirectional use assumes symmetrical voltage swing or AC-coupled signals; unidirectional designs require polarity-aware placement and cannot rely on SMCJ45CAHM3/H for forward conduction blocking.
How does the thermal resistance RθJA = 75 °C/W impact PCB layout for SMCJ45CAHM3/H?
The RθJA = 75 °C/W rating for SMCJ45CAHM3/H assumes mounting on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. To maintain junction temperature ≤150 °C under sustained 6.5 W power dissipation, designers must allocate sufficient copper area and consider thermal vias. Reducing pad size or omitting thermal relief increases junction temperature, risking premature failure during repetitive surge events - especially in enclosed automotive or industrial enclosures.
SMCJ45CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- 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)
SMCJ45CAHM3/H FAQ
1.How can I place an order for SMCJ45CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAHM3/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 SMCJ45CAHM3/H reliable?
The price and inventory of SMCJ45CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ45CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAHM3/H?
SMCJ45CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAHM3/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 SMCJ45CAHM3/H?
For technical support, including SMCJ45CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAHM3/H requirements.
6.How does Aetrix verify that SMCJ45CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAHM3/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 SMCJ45CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ45CAHM3/H?
All SMCJ45CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAHM3/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 SMCJ45CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ45CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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