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Taiwan Semiconductor Corporation SMCJ45AH
- Part No.:
- SMCJ45AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,402
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Product details
Overview
SMCJ45AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 45V working stand-off voltage (VWM), 50–55.3V breakdown voltage (VBR), and 72.7V maximum clamping voltage (VC) at 21A 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 SMCJ45AH datasheet, SMCJ45AH pinout, SMCJ45AH application, or SMCJ45AH equivalent, this device is selected for high-energy transient suppression in DC power rails, automotive ECUs, and industrial I/O interfaces where fast response (<1.0 ps), low leakage (<1 µA @ 45V), and robust 150°C junction operation are required.
Technical Context
The SMCJ45AH employs a glass-passivated silicon junction optimized for unidirectional surge clamping. Its thermal design supports 10°C/W junction-to-case resistance and 55°C/W junction-to-ambient resistance, enabling sustained 5W steady-state dissipation at 25°C ambient.
It operates within -55°C to +150°C junction temperature range and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by cathode band per DO-214AB mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48V systems. |
| VBR min/max | 50 V / 55.3 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on under transients. |
| VC @ IPPM | 72.7 V - Clamped voltage at 21 A peak pulse (10/1000 µs); limits downstream voltage stress during ISO 7637-2 Pulse 5a events. |
| PPK | 1500 W - Peak pulse power handling capability; sustains high-energy surges without failure per Fig.5 waveform. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes standby power loss in battery-backed systems. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive environments. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210 g mass and UL 94V-0 molding compound. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with axial leads, cathode indicated by band marking; polarity-critical for unidirectional operation; terminals are matte tin-plated and J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; completes clamping loop during positive transients. |
| Cathode | Reverse-biased terminal | Connected to protected line (e.g., 48V rail); avalanche breakdown initiates when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress conditions. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (capacitive coupling) waveforms. |
| Fast response time | <1.0 ps rise from 0 V to VBR min - enables clamping before sensitive ICs experience overvoltage damage. |
| Glass passivated junction | Enhances long-term stability and moisture resistance; supports MSL Level 1 per J-STD-020 for unlimited floor life. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - suitable for environmentally regulated industrial and automotive production. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 48V supply lines in BCMs against load-dump transients up to 120V and 200 ms duration per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 48V rail and local regulator input to clamp surges before LDO or DC/DC stage. Use Value: Limits clamped voltage to 72.7V at 21A, preventing overvoltage damage to 80V-rated input capacitors and regulators. |
Use Scenario: Safeguarding 24V digital input channels on PLC I/O modules from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted directly at connector entry point, ahead of optocoupler or Schmitt trigger input. Use Value: Sub-µA leakage preserves signal integrity in high-impedance sensing circuits; DO-214AB footprint allows automated placement near connectors. |
| Telecom Remote Radio Unit (RRU) Power Interface | EV Onboard Charger (OBC) Auxiliary Supply |
Use Scenario: Shielding 48V backhaul power inputs in outdoor RRUs from lightning-induced surges and AC coupling transients. IC Role / Device Role / Timing Role: First-line defense TVS on DC input stage, coordinated with upstream fuse and downstream π-filter for multi-stage protection. Use Value: 1500W peak power rating handles high-energy 10/1000 µs transients; 150°C TJ rating supports operation in sealed, thermally constrained enclosures. |
Use Scenario: Securing 12V auxiliary supply derived from OBC's main DC link against switching noise and regenerative spikes. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMCJ45AH deployed as unidirectional clamp on positive rail with grounded anode configuration. Use Value: Cathode-band polarity marking ensures correct orientation during SMT assembly; J-STD-002 solderability guarantees reliable reflow joint formation. |
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 SMAJ45A | Same DO-214AC (SMA) package; lower PPK (400W); VBR 50–55.3V; VC = 72.7V @ 5.5A. | Lower energy handling limits use to sub-100W surge environments; unsuitable for ISO 7637-2 Pulse 5a. | Select SMCJ45AH when 1500W clamping and automotive qualification are mandatory. |
| ON Semiconductor 1.5SMC47A | DO-214AB package; PPK = 1500W; VBR = 52.2–57.7V; VC = 77.0V @ 19.5A; no AEC-Q101 or ISO 7637-2 documentation. | Lacks automotive qualification evidence; clamping voltage 4.3V higher than SMCJ45AH at rated current. | Choose SMCJ45AH for certified automotive deployments requiring documented ISO 7637-2 compliance. |
Compared with SMAJ45A and 1.5SMC47A, the SMCJ45AH uniquely combines 1500W surge rating, AEC-Q101 qualification, and ISO 7637-2 Pulse 1/2a/2b/3a/3b validation in a single DO-214AB platform-making it the preferred choice for safety-critical automotive and industrial power rail protection.
Availability
SMCJ45AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom remote radio units, and EV onboard charger auxiliary supplies requiring stable component supply across extended production lifecycles.
Supply support for SMCJ45AH 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 high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of SMCJ45AH at its rated peak pulse current?
The SMCJ45AH has a maximum clamping voltage (VC) of 72.7 V at 21 A peak pulse current (IPPM), measured using the 10/1000 µs standard waveform per IEC 61000-4-5. This value ensures protected circuitry remains below critical overvoltage thresholds during high-energy transients, and is verified per Taiwan Semiconductor's datasheet revision A2102, page 3.
Is SMCJ45AH suitable for bidirectional transient suppression?
No, SMCJ45AH is a unidirectional TVS diode intended for DC rail protection with defined polarity (cathode-marked). For bidirectional applications, Taiwan Semiconductor specifies the SMCJ45CAH variant, which uses a center-tapped dual-die configuration. The SMCJ45AH must be oriented with cathode toward the protected line and anode to ground to function correctly.
Does SMCJ45AH meet automotive qualification standards?
Yes, SMCJ45AH is explicitly AEC-Q101 qualified and tested per the full stress test schedule, including HTGB, H3TRB, TCT, and ESD. It also meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for automotive power net applications such as body control modules and infotainment power supplies.
What is the maximum steady-state power dissipation for SMCJ45AH?
The SMCJ45AH has a steady-state power dissipation (PD) rating of 5 W at 25°C ambient temperature, derating linearly above that per the thermal curve in Figure 2 of the datasheet. This rating applies only to continuous DC or low-frequency reverse bias conditions-not transient events-and assumes adequate PCB copper area for heat spreading.
How does the SMCJ45AH differ from the SMCJ45H variant?
The SMCJ45AH offers tighter breakdown voltage tolerance (50–55.3 V) versus SMCJ45H (50–61.1 V), resulting in more consistent clamping onset and lower VC variation across production lots. Both share identical package, PPK, and thermal specs, but SMCJ45AH is preferred where precise VBR control improves system-level surge margin predictability.
SMCJ45AH 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 21A
- 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)
SMCJ45AH FAQ
1.How can I place an order for SMCJ45AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AH 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 SMCJ45AH reliable?
The price and inventory of SMCJ45AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45AH is usually 5 days.
3.What payment methods are accepted for SMCJ45AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AH?
SMCJ45AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AH 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 SMCJ45AH?
For technical support, including SMCJ45AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AH requirements.
6.How does Aetrix verify that SMCJ45AH is sourced from the original manufacturer or authorized distributors?
All SMCJ45AH 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 SMCJ45AH meets industry standards.
7.What is the process for return or replacement of SMCJ45AH?
All SMCJ45AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AH, 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 SMCJ45AH part is unused and in its original packaging.
Return procedure for SMCJ45AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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