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Taiwan Semiconductor Corporation SMCJ64A
- Part No.:
- SMCJ64A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ64A.pdf
- Description:
- TVS DIODE 64VWM 103VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,645
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Product details
Overview
SMCJ64A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 64V working stand-off voltage (VWM), 71.1–78.6V breakdown voltage (VBR), and 103V maximum clamping voltage (VC) at 15A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ64A datasheet, SMCJ64A pinout, SMCJ64A application, or SMCJ64A equivalent, this device delivers verified ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and JESD201 Class 2 whisker resistance - critical for ESD-hardened industrial control and automotive body electronics.
Technical Context
The SMCJ64A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (71.1–78.6V @ 1mA), clamping transients to ≤103V at 15A (10/1000µs waveform). Its glass-passivated junction ensures stable breakdown and low leakage under thermal stress.
Designed for high-energy surge suppression, it sustains 1500W peak pulse power (tp = 1ms), derates linearly above 25°C (RθJA = 55°C/W), and supports 200A non-repetitive forward surge (8.3ms half-sine) - enabling robust protection of 12V/24V automotive ECUs and DC-DC converter inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail (e.g., 72V max in 60V nominal automotive systems) |
| VBR min/max | 71.1 / 78.6 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction |
| VC @ IPPM | 103 V @ 15 A (10/1000µs) - Clamped voltage during worst-case surge; limits downstream IC stress to safe levels |
| PPK | 1500 W - Peak pulse power handling capacity; meets ISO 7637-2 Pulse 5a (load dump) requirements |
| IR @ VWM | <1 µA - Ultra-low reverse leakage; prevents standby current drain in battery-powered systems |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient; informs heatsinking needs for sustained surge duty cycles |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case rated UL 94V-0, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g. Moisture sensitivity level (MSL): Level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-side reference | Connected to ground or low-voltage return; defines unidirectional clamping direction |
| Cathode | Transient voltage input / protected line connection | Connected to protected signal/power line (e.g., 64V rail); conducts avalanche current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Sub-1 ps response time | Clamps ESD and fast transients before sensitive ICs experience overstress - critical for CAN/LIN bus protection |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) - full automotive EMC readiness |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability applications; eliminates latent short-circuit risk in sealed modules |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives; supports green manufacturing and end-of-life recycling |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 120V, 400ms) on 24V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input, clamping surges within 103V to protect upstream regulators. Use Value: Enables compliance with ISO 16750-2 Section 4.7 (load dump) without external series impedance or active circuitry. | Use Scenario: Protecting 24V digital input channels of programmable logic controllers against inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Standoff device across input terminals, absorbing 15A/1000µs transients induced by valve coil de-energization. Use Value: Eliminates need for RC snubbers or relay-based isolation, reducing BOM count and board space in DIN-rail mounted I/O modules. |
| LED Driver Overvoltage Clamp | Telecom Power Interface Protection |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems exposed to lightning-induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: Primary clamping element on driver input, activated only during >71.1V events to avoid interference with normal PWM dimming operation. Use Value: Maintains VWM margin (64V) above nominal 48V rail while clamping to 103V - preventing MOSFET gate oxide rupture and current-sense amplifier damage. | Use Scenario: Front-end protection of PoE-powered network switches against AC mains coupling and EFT bursts on 57V auxiliary power inputs. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMCJ64A deployed as unidirectional clamp to ground on positive rail, leveraging its 1µA leakage for low-power monitoring circuits. Use Value: Provides 1500W surge rating with minimal capacitance (<100pF), preserving signal integrity on high-speed Ethernet PHY power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A (ON Semiconductor) | Same VWM (64V), lower PPK (600W), higher VC (104V @ 8.3A), SMB package (smaller footprint, higher RθJA) | Limited to lower-energy transients (e.g., IEC 61000-4-4 EFT); unsuitable for ISO 7637-2 Pulse 5a | Select SMCJ64A when 1500W surge capability and DO-214AB thermal performance are required. |
| P6KE68A (Littelfuse) | Higher VWM (68V), same PPK (1500W), larger DO-15 axial package, slower response (~1ns), no ISO 7637-2 validation | Requires through-hole mounting and additional board area; lacks automotive qualification documentation | Choose SMCJ64A for surface-mount automation, automotive qualification, and tighter VBR tolerance (±5% vs ±10%). |
Compared with SMBJ64A and P6KE68A, the SMCJ64A uniquely combines 1500W rating, DO-214AB thermal efficiency (RθJC = 10°C/W), ISO 7637-2 validation, and automated placement compatibility - making it the preferred choice for high-reliability automotive and industrial power rail protection where surge energy and manufacturability are jointly constrained.
Availability
SMCJ64A is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, and LED driver overvoltage protection requiring stable component supply across multi-year production programs.
Supply support for SMCJ64A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for automotive and industrial markets.
The SMCJ series is part of TSC's high-power TVS platform engineered specifically for ISO 7637-2-compliant automotive transient suppression and high-reliability industrial surge immunity - emphasizing glass passivation, MSL-1 packaging, and rigorous AEC-Q200-aligned stress testing.
FAQ
What is the clamping voltage of the SMCJ64A under standard 10/1000µs surge conditions?
The SMCJ64A has a maximum clamping voltage (VC) of 103 V when subjected to a 15 A peak pulse current with a 10/1000µs waveform. This value is measured per JEDEC standards and confirmed in the official Taiwan Semiconductor datasheet revision S2104. The clamping performance ensures downstream components see no more than 103 V during validated surge events, directly supporting design margin calculations for 64V-rated systems using the SMCJ64A.
Is the SMCJ64A suitable for bidirectional transient protection?
No, the SMCJ64A is a unidirectional TVS diode intended for single-polarity surge suppression - its cathode must be connected to the protected line and anode to ground. For bidirectional protection, Taiwan Semiconductor specifies the SMCJ64CA variant (with "CA" suffix), which features symmetrical breakdown in both directions. Using the SMCJ64A in reverse-biased configurations risks permanent damage, as it is not rated for reverse conduction beyond its VWM of 64 V.
Does the SMCJ64A meet automotive qualification standards such as AEC-Q200?
The SMCJ64A is not explicitly AEC-Q200 qualified per the published datasheet, but it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b - the core automotive transient immunity standard. It also satisfies JESD201 Class 2 whisker resistance and J-STD-020 MSL-1 moisture sensitivity - key prerequisites for automotive use. Customers requiring formal AEC-Q200 certification should consult Taiwan Semiconductor's qualified parts list or consider the AEC-Q200-qualified SMCJ64A-Q variant if available.
What is the maximum steady-state power dissipation (PD) for the SMCJ64A at 25°C ambient?
The SMCJ64A has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency reverse bias conditions - not transient events. In normal operation, reverse leakage remains below 1 µA above 10 V, resulting in negligible static power loss. The 5 W PD limit governs thermal design for sustained overvoltage fault conditions, not typical clamping duty cycles.
How does the SMCJ64A compare to the SMCJ64 (non-A) version in terms of breakdown voltage tolerance?
The SMCJ64A offers tighter breakdown voltage (VBR) tolerance than the standard SMCJ64: SMCJ64A is specified at 71.1–78.6 V (±5.3% around 74.85 V nominal), whereas SMCJ64 is 71.1–86.9 V (±11.1%). This narrower VBR window improves predictability in clamping onset and reduces design margin uncertainty. Both share identical package, power rating, and thermal specs, but the "A" suffix denotes enhanced VBR consistency - critical for systems with tight voltage headroom constraints using the SMCJ64A.
SMCJ64A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 14.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ64A FAQ
1.How can I place an order for SMCJ64A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ64A 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 SMCJ64A reliable?
The price and inventory of SMCJ64A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ64A is usually 5 days.
3.What payment methods are accepted for SMCJ64A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ64A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ64A?
SMCJ64A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ64A 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 SMCJ64A?
For technical support, including SMCJ64A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ64A requirements.
6.How does Aetrix verify that SMCJ64A is sourced from the original manufacturer or authorized distributors?
All SMCJ64A 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 SMCJ64A meets industry standards.
7.What is the process for return or replacement of SMCJ64A?
All SMCJ64A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ64A, 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 SMCJ64A part is unused and in its original packaging.
Return procedure for SMCJ64A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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