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Taiwan Semiconductor Corporation SMCJ78H
- Part No.:
- SMCJ78H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78H.pdf
- Description:
- 1500W, 96.4V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:5,041
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Product details
Overview
SMCJ78H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 78V working stand-off voltage (VWM), 86.7–106V breakdown voltage (VBR), and 139V maximum clamping voltage (VC) at 11.3A peak pulse current - designed for automotive-grade ESD and load-dump protection in power rails of industrial control modules.
For engineers reviewing the SMCJ78H datasheet, SMCJ78H pinout, SMCJ78H application, or SMCJ78H equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA reverse leakage above 10V, and glass-passivated junction reliability in high-reliability 12V/24V system interfaces.
Technical Context
The SMCJ78H operates as a unidirectional avalanche-clamping TVS diode, triggered when reverse voltage exceeds its VBR range (86.7–106V @ 1mA), limiting transient energy via controlled avalanche breakdown. Its 1500W peak pulse power rating (tp = 1ms) supports robust immunity against ISO 7637-2 load-dump surges up to 139V at 11.3A.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling stable operation up to TJ = +150°C. The device uses a single-die construction in DO-214AB (SMC) package with matte tin-plated leads compliant to J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail (e.g., 80V nominal 24V bus). |
| VBR min/max | 86.7 V / 106 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on across process variation and temperature. |
| VC @ IPPM | 139 V @ 11.3 A - Clamped voltage during 10/1000μs surge; defines worst-case overvoltage seen by protected ICs. |
| PPK | 1500 W - Peak pulse power handling per IEC 61000-4-5 & ISO 7637-2; enables single-device protection against severe transients. |
| IR @ VWM | <1 μA - Ultra-low leakage at rated stand-off; avoids parasitic loading on high-impedance sensor or reference circuits. |
| TJ max | +150 °C - Junction temperature limit supporting under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-banded unidirectional configuration. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated for J-STD-002-compliant soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24V supply rail); polarity marking (band) ensures correct orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in engine control units and ADAS power domains without requalification. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) - covers full vehicle electrical disturbance profile. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives - critical for extended life in humid industrial environments. |
| Fast response time | <1.0 ps from 0 V to VBR min - clamps before sensitive downstream logic or analog circuitry can be damaged by fast-rising ESD or lightning-induced edges. |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement before reflow - simplifies SMT assembly and reduces manufacturing overhead. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input/Output Modules |
|---|---|
Use Scenario: Protecting 24V supply lines in body control modules against load-dump transients during alternator disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input, absorbing up to 1500W for 1ms. Use Value: Limits peak voltage to 139V, preventing damage to 100V-rated MOSFETs and LDO regulators downstream. |
Use Scenario: Safeguarding digital I/O channels in programmable logic controllers exposed to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Standoff protection on 24V field-side inputs, activated only during >86.7V surges. Use Value: Sub-1ps response ensures clamping occurs before microcontroller GPIO latch-up or internal ESD diode failure. |
| Telecom Power Feeds | Renewable Energy Inverter Control Boards |
Use Scenario: Shielding PoE-powered remote radio units from lightning-induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input stage, coordinated with secondary MOV and filter stages. Use Value: 139V clamping allows use with 60V-rated DC-DC converters while maintaining >12V safety margin. |
Use Scenario: Transient suppression on gate-drive power supplies in solar inverter half-bridges subjected to switching noise and grid faults. IC Role / Device Role / Timing Role: Localized protection for isolated bias rails feeding high-side gate drivers. Use Value: Low IR (<1μA) prevents quiescent current drift in precision gate bias networks over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ78A | Same DO-214AC (SMA) package; lower PPK (400W); VBR = 86.7–95.8V; VC = 129V @ 9.2A. | Lower power rating limits suitability to lighter-duty 24V systems; not AEC-Q101 qualified. | Select when cost-sensitive non-automotive designs require basic ESD/EMI suppression without load-dump capability. |
| Vishay SMF78A | DO-219AB (SOD-123FL) package; PPK = 200W; VBR = 86.7–95.8V; VC = 129V @ 1.5A; smaller footprint. | Insufficient for ISO 7637-2 Pulse 5a/b (load dump); suited only for board-level ESD, not system-level surges. | Choose for space-constrained consumer electronics where 1500W surge immunity is unnecessary. |
Compared with SMAJ78A and SMF78A, the SMCJ78H provides 3.75× higher peak power handling and AEC-Q101 qualification - making it the only option among the three validated for automotive 24V rail protection against full ISO 7637-2 load-dump events.
Availability
SMCJ78H is available at Aetrix Electronics and suitable for automotive power management, industrial PLC I/O protection, and telecom DC feed applications requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant surge immunity.
Supply support for SMCJ78H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMCJ78H belongs to TSC's AEC-Q101-qualified SMCJ-H series - engineered specifically for high-energy transient suppression in 12V/24V/48V automotive and industrial power systems.
FAQ
What is the clamping voltage of the SMCJ78H under standard 10/1000μs surge conditions?
The SMCJ78H has a maximum clamping voltage (VC) of 139 V at 11.3 A peak pulse current (IPPM), measured using the standardized 10/1000μs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMCJ78H suitable for bidirectional transient protection?
No - the SMCJ78H is a unidirectional TVS diode intended for DC rail protection with defined anode/cathode polarity. For bidirectional applications (e.g., AC lines or data buses), Taiwan Semiconductor specifies variants with "CH" or "CAH" suffixes (e.g., SMCJ78CH), which exhibit symmetrical breakdown in both directions and share identical VBR and VC ratings.
Does the SMCJ78H meet automotive qualification standards?
Yes - the SMCJ78H is explicitly AEC-Q101 qualified and tested per the full stress test schedule, including HTGB, HTRB, TST, and mechanical shock. It also complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, confirming suitability for use in engine control units, body electronics, and ADAS power domains.
What is the thermal resistance from junction to ambient for the SMCJ78H?
The SMCJ78H has a typical junction-to-ambient thermal resistance (RθJA) of 55°C/W when mounted on a standard JEDEC 2-layer PCB with 1 in² copper pad. This value assumes no additional heatsinking; actual thermal performance improves with larger copper areas or thermal vias, enabling sustained operation at TJ ≤ +150°C in enclosed enclosures.
How does the SMCJ78H compare to the SMCJ78AH variant?
The SMCJ78AH offers tighter VBR tolerance (86.7–95.8 V vs. 86.7–106 V for SMCJ78H) and lower clamping voltage (126 V vs. 139 V at 12.5 A), achieved through enhanced process control. Both share identical package, AEC-Q101 qualification, and ISO 7637-2 compliance - but SMCJ78AH is preferred where precise clamping consistency is required across production lots.
SMCJ78H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 139V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMCJ78H FAQ
1.How can I place an order for SMCJ78H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78H 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 SMCJ78H reliable?
The price and inventory of SMCJ78H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78H is usually 5 days.
3.What payment methods are accepted for SMCJ78H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78H?
SMCJ78H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78H 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 SMCJ78H?
For technical support, including SMCJ78H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78H requirements.
6.How does Aetrix verify that SMCJ78H is sourced from the original manufacturer or authorized distributors?
All SMCJ78H 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 SMCJ78H meets industry standards.
7.What is the process for return or replacement of SMCJ78H?
All SMCJ78H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78H, 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 SMCJ78H part is unused and in its original packaging.
Return procedure for SMCJ78H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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