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Taiwan Semiconductor Corporation SMCJ70AH
- Part No.:
- SMCJ70AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70AH.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,322
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Product details
Overview
SMCJ70AH from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 70V working stand-off voltage (VWM), 77.8–86V breakdown voltage (VBR), and 113V maximum clamping voltage (VC) at 13.9A peak pulse current-designed to protect automotive power electronics against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ70AH datasheet, SMCJ70AH pinout, SMCJ70AH application, or SMCJ70AH equivalent, key selection criteria include clamping performance under 10/1000μs surge, AEC-Q101 qualification for automotive use, unidirectional polarity marking, thermal resistance (RθJA = 55°C/W), and compatibility with automated SMT placement on 12V–48V DC bus systems.
Technical Context
The SMCJ70AH employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise from 0V to VBR min) and low leakage (<1μA at 70V). Its unidirectional configuration provides asymmetric protection with forward conduction limited to 3.5V at 100A only for SMCJ5.0H–SMCJ90H variants-though SMCJ70AH falls within that range and shares VF = 3.5V.
It meets ISO 7637-2 immunity requirements for automotive load-dump and inductive switching events, with peak pulse power rated at 1500W for 1ms, derated linearly above 25°C ambient per Fig.2. Junction temperature range is –55°C to +150°C, supporting under-hood deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines system DC bus rating compatibility (e.g., 48V nominal systems) |
| VBR min/max | 77.8 V / 86 V - Breakdown occurs within this band at 1mA test current; ensures predictable turn-on margin above VWM |
| VC @ IPPM | 113 V - Clamped voltage at 13.9A peak pulse (10/1000μs); determines maximum stress imposed on protected ICs |
| PPK | 1500 W - Peak pulse power handling for 1ms non-repetitive surge; enables robust protection against severe load dump |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs heatsinking needs for sustained surge duty cycles |
| IR @ VWM | <1 μA - Reverse leakage at 70V; negligible power loss and signal integrity impact in standby |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, cathode band marking for polarity identification, 0.210g weight, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional TVS | Connected to protected line (e.g., battery rail); conducts during positive transients to ground |
| Anode | Low-side reference terminal | Connected to system ground; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and body electronics without additional qualification effort |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive electrical transients including load dump (Pulse 5a) and inductive switch-off (Pulse 2b) |
| Fast response time <1.0ps | Clamps before sensitive downstream components experience damaging voltage overshoot |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and process complexity |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from battery line transients during ignition and alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply rail and ground, clamping surges before they reach 5V LDO inputs. Use Value: Limits peak voltage to 113V during 13.9A 10/1000μs surge, preventing latch-up or gate oxide damage in protected ASICs. | Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Standoff device across input terminals, conducting only during >70V transients while remaining high-impedance during normal operation. Use Value: With <1μA leakage at 70V, it avoids false triggering of optocoupler inputs and preserves signal integrity in low-current sensing circuits. |
| Telecom Power Supply Input | EV Onboard Charger (OBC) Auxiliary Rail |
Use Scenario: Secondary-side transient suppression on 48V telecom rectifier outputs feeding PoE midspans and baseband processors. IC Role / Device Role / Timing Role: Primary clamping element on DC output bus, coordinated with upstream MOVs to handle multi-pulse surge sequences. Use Value: 1500W peak power rating sustains repeated 1ms surges without degradation, supporting GR-1089-CORE compliance. | Use Scenario: Protecting 12V auxiliary power rails in electric vehicle onboard chargers from CAN/LIN bus coupling and high-voltage isolation barrier leakage. IC Role / Device Role / Timing Role: Unidirectional TVS on isolated 12V domain, referenced to local ground to prevent common-mode surge propagation into MCU domains. Use Value: AEC-Q101 qualification and –55°C to +150°C operation ensure functional safety compliance in ASIL-B subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70AH | Same VWM (70V), lower PPK (600W), higher VC (120V @ 5A), smaller DO-214AA (SMA) package | Lower surge capacity suits consumer-grade 24V systems; not AEC-Q101 qualified | Select when space-constrained and automotive qualification is unnecessary |
| 1.5SMC70A | Identical VWM (70V), same DO-214AB package, but 1500W rating with VC = 113V @ 13.9A; RoHS-compliant but no AEC-Q101 documentation | Lacks formal automotive qualification; may require customer-level validation for automotive use | Select if AEC-Q101 is not mandated and sourcing flexibility across distributors is prioritized |
Compared with SAC70AH and 1.5SMC70A, the SMCJ70AH uniquely combines AEC-Q101 qualification, ISO 7637-2 compliance, and 1500W clamping in a single DO-214AB device-making it the preferred choice for production automotive ECUs where regulatory traceability and surge margin are critical.
Availability
SMCJ70AH is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and repeatable 1500W transient suppression performance.
Supply support for SMCJ70AH 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, MOSFETs, and power management devices.
The SMCJ series was developed specifically for automotive and industrial transient protection, emphasizing AEC-Q101 reliability, ISO 7637-2 immunity, and high-power clamping in standard SMC packages.
FAQ
What is the clamping voltage of the SMCJ70AH under a standard 10/1000μs surge?
The SMCJ70AH has a maximum clamping voltage (VC) of 113 V when subjected to a 13.9 A peak pulse current with a 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream components. The SMCJ70AH achieves this clamping performance while maintaining low leakage and fast response, making it suitable for protecting sensitive automotive electronics.
Is the SMCJ70AH suitable for bidirectional transient protection?
No, the SMCJ70AH is a unidirectional TVS diode, indicated by the "H" suffix and cathode band marking. For bidirectional protection, Taiwan Semiconductor offers the SMCJ70AH's counterpart SMCJ70CH or SMCJ70CAH-both explicitly rated for symmetrical clamping in either polarity. Using the SMCJ70AH in bidirectional configurations risks failure during negative transients, as it does not conduct below ~0.7V forward drop.
Does the SMCJ70AH meet automotive qualification standards?
Yes, the SMCJ70AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. These qualifications were verified through standardized stress tests including temperature cycling, high-temperature reverse bias, and surge waveform validation-ensuring reliability in automotive power distribution networks. The SMCJ70AH's qualification data is documented in Taiwan Semiconductor's official A2102 specification release.
What is the forward voltage drop of the SMCJ70AH at high current?
The SMCJ70AH exhibits a typical forward voltage (VF) of 3.5 V at 100 A, consistent with the SMCJ5.0H–SMCJ90H family grouping specified in the datasheet. This VF value applies only during forward conduction (e.g., during negative transients on a unidirectional device incorrectly installed), and is not relevant during normal reverse-biased clamping operation. The SMCJ70AH's primary function remains reverse-transient suppression at 70V stand-off.
How does the SMCJ70AH compare to the SMCJ70H variant?
The SMCJ70AH differs from SMCJ70H primarily in tighter VBR tolerance: SMCJ70AH specifies 77.8–86 V (±5.3% around nominal 81.9 V), whereas SMCJ70H is 77.8–95.1 V (±11.2%). Both share identical VWM (70 V), VC (113 V / 125 V), and PPK (1500 W), but the SMCJ70AH's narrower breakdown range improves design margin predictability in precision clamp applications. The SMCJ70AH marking code is GGP, confirming its "A"-grade binning.
SMCJ70AH 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- 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)
SMCJ70AH FAQ
1.How can I place an order for SMCJ70AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70AH 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 SMCJ70AH reliable?
The price and inventory of SMCJ70AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70AH is usually 5 days.
3.What payment methods are accepted for SMCJ70AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70AH?
SMCJ70AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70AH 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 SMCJ70AH?
For technical support, including SMCJ70AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70AH requirements.
6.How does Aetrix verify that SMCJ70AH is sourced from the original manufacturer or authorized distributors?
All SMCJ70AH 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 SMCJ70AH meets industry standards.
7.What is the process for return or replacement of SMCJ70AH?
All SMCJ70AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70AH, 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 SMCJ70AH part is unused and in its original packaging.
Return procedure for SMCJ70AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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