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Taiwan Semiconductor Corporation SMCJ40AH
- Part No.:
- SMCJ40AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40AH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,166
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Product details
Overview
SMCJ40AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 40V working stand-off voltage (VWM), 44.4–49.1V breakdown voltage (VBR), and 64.5V maximum clamping voltage (VC) at 24A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the SMCJ40AH datasheet, SMCJ40AH pinout, SMCJ40AH application, or SMCJ40AH equivalent, this device is selected for high-energy transient suppression in power supply rails, DC motor drives, and automotive body control modules where fast response (<1.0 ps), low leakage (<1 µA @ 40V), and robust 1500W peak power handling are critical.
Technical Context
The SMCJ40AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (44.4–49.1V @ 1 mA). Its glass-passivated junction ensures stable breakdown and low leakage, while thermal resistance (RθJC = 10°C/W) supports reliable power dissipation under repetitive surge conditions.
Designed for automotive-grade reliability, it complies with AEC-Q101 and ISO 7637-2 test pulses - including 8.3 ms half-sine surge (IFSM = 200 A) and fast transient clamping (VC = 64.5 V @ IPPM = 24 A). Polarity is marked by cathode band; no internal series impedance or integrated filtering is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 44.4 V / 49.1 V @ 1 mA - Confirmed breakdown threshold range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 64.5 V @ 24 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤64.5 V. |
| PPK | 1500 W - Peak pulse power rating per 1 ms waveform; enables protection against high-energy transients. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; negligible power loss and signal integrity impact in standby. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with automated placement. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on cathode end. Weight ≈ 0.210 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (VF = 3.5 V @ 100 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 40 V rail); avalanches into low-impedance state when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing. |
| Glass passivated junction | Enhances long-term stability of VBR and IR; reduces parameter drift over lifetime and thermal stress. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge). |
| Fast response time | <1.0 ps rise from 0 V to VBR min - clamps before sensitive downstream circuitry reacts. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; simplifies SMT manufacturing flow. |
Applications
| Automotive Power Distribution | Industrial DC Motor Control |
|---|---|
|
Use Scenario: Protecting 40 V battery-fed ECUs (e.g., HVAC actuators, seat controllers) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp transients before LDOs or MCUs. Use Value: Limits voltage excursions to ≤64.5 V during 1500 W surges, preventing latch-up or gate oxide damage in 40 V-rated silicon. |
Use Scenario: Safeguarding H-bridge gate drivers and current-sense amplifiers in 36–48 V industrial motor drives. IC Role / Device Role / Timing Role: Mounted at motor driver power input to absorb inductive kickback from brushed/BLDC motors. Use Value: Withstands 200 A non-repetitive forward surge (IFSM) and clamps reverse spikes within 1.0 ps, preserving MOSFET gate integrity. |
| Telecom Power Interface | Renewable Energy Charge Controllers |
|
Use Scenario: Shielding PoE-powered equipment (e.g., IP cameras, access points) connected to 40 V auxiliary power inputs. IC Role / Device Role / Timing Role: Primary transient shunt on secondary-side DC bus, upstream of DC-DC converters. Use Value: Low IR (<1 µA) avoids loading 40 V standby rails; 64.5 V clamping ensures compatibility with 65 V-rated converter ICs. |
Use Scenario: Protecting MPPT controller inputs exposed to lightning-induced surges in off-grid solar battery banks (nominal 48 V). IC Role / Device Role / Timing Role: Front-end clamping element on PV input stage, coordinated with MOVs and GDTs in multi-stage protection. Use Value: 1500 W PPK rating handles high-energy 10/1000 µs waveforms; DO-214AB footprint allows dense layout with thermal relief pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPK (400 W), same VWM/VBR range, SMA package (smaller thermal mass). | Not suitable for 1500 W ISO 7637-2 Pulse 5a; limited to lower-energy transients. | Select only if system-level surge energy is confirmed ≤400 W and space constraints favor SMA. |
| SMCJ40A | Same package and PPK, but non-AEC-Q101; lacks automotive qualification and ISO 7637-2 validation. | Acceptable for industrial/commercial use but not for automotive OEM or Tier-1 designs requiring AEC-Q101. | Choose SMCJ40AH when automotive qualification, extended temperature reliability, or certified pulse immunity is mandatory. |
Compared with SMAJ40A and SMCJ40A, the SMCJ40AH uniquely combines 1500 W surge capability, AEC-Q101 qualification, and ISO 7637-2 compliance in a single DO-214AB device - making it the only option among the three validated for under-hood automotive deployment with full load-dump immunity.
Availability
SMCJ40AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor control, telecom power interfaces, and renewable energy charge controllers requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ40AH 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 devices since 1979.
The SMCJ40AH belongs to TSC's AEC-Q101-qualified SMCJ(A)H family, engineered specifically for high-reliability transient suppression in automotive and industrial 12–170 V systems where robustness, consistency, and standardized packaging are essential.
FAQ
What is the clamping voltage of the SMCJ40AH under standard 10/1000 µs surge conditions?
The SMCJ40AH has a maximum clamping voltage (VC) of 64.5 V at 24 A peak pulse current (IPPM), measured using the 10/1000 µs double-exponential waveform per IEC 61000-4-5 and ISO 7637-2. This value ensures protected circuits remain below 65 V during worst-case transients, aligning with 65 V-rated downstream components. The SMCJ40AH achieves this clamping performance while maintaining low leakage and fast response.
Is the SMCJ40AH suitable for bidirectional transient protection?
No - the SMCJ40AH is a unidirectional TVS diode, designed for suppression on DC rails with defined polarity (cathode connected to the protected line). For bidirectional protection, Taiwan Semiconductor offers the SMCJ40CAH variant, which features symmetrical breakdown in both directions. Using SMCJ40AH in AC or floating applications risks failure due to forward conduction during negative transients.
Does the SMCJ40AH require derating at elevated ambient temperatures?
Yes - the SMCJ40AH's peak pulse power (PPK) must be derated above TA = 25°C per Figure 2 in the datasheet. At 100°C ambient, PPK drops to approximately 750 W (50% derating), and at 125°C, it falls to ~500 W. Thermal design must account for RθJA = 55°C/W and RθJC = 10°C/W to avoid exceeding TJ(max) = 150°C during repeated surges.
What is the forward voltage drop of the SMCJ40AH during high-current surge events?
The SMCJ40AH exhibits a forward voltage (VF) of 3.5 V at 100 A, per the datasheet's note for SMCJ5.0H–SMCJ90H devices. This VF applies only during unidirectional forward conduction (e.g., during positive-going surges on grounded-anode configurations) and confirms low insertion loss during high-current clamping. The SMCJ40AH maintains this VF characteristic without significant thermal runaway up to IFSM = 200 A.
How does the SMCJ40AH compare to the SMCJ40H in terms of breakdown voltage tolerance?
The SMCJ40AH has a tighter VBR range (44.4–49.1 V) versus SMCJ40H (44.4–54.3 V), reflecting improved process control in the "A" variant. This narrower spread reduces uncertainty in clamping onset timing and improves system-level predictability - especially valuable in safety-critical automotive modules where consistent transient response is mandated. Both share identical package, PPK, and thermal specs, but only SMCJ40AH carries AEC-Q101 certification.
SMCJ40AH 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 24A
- 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)
SMCJ40AH FAQ
1.How can I place an order for SMCJ40AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40AH 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 SMCJ40AH reliable?
The price and inventory of SMCJ40AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40AH is usually 5 days.
3.What payment methods are accepted for SMCJ40AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40AH?
SMCJ40AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40AH 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 SMCJ40AH?
For technical support, including SMCJ40AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40AH requirements.
6.How does Aetrix verify that SMCJ40AH is sourced from the original manufacturer or authorized distributors?
All SMCJ40AH 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 SMCJ40AH meets industry standards.
7.What is the process for return or replacement of SMCJ40AH?
All SMCJ40AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40AH, 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 SMCJ40AH part is unused and in its original packaging.
Return procedure for SMCJ40AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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