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Taiwan Semiconductor Corporation SMCJ18H
- Part No.:
- SMCJ18H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18H.pdf
- Description:
- 1500W, 22.2V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:7,172
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Product details
Overview
SMCJ18H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 20V minimum breakdown voltage (VBR), 18V working stand-off voltage (VWM), and 32.2V maximum clamping voltage (VC) at 48A peak pulse current - designed for automotive-grade ESD and load-dump protection in power rails of industrial control modules.
For engineers reviewing the SMCJ18H datasheet, SMCJ18H pinout, SMCJ18H application, or SMCJ18H equivalent, key selection criteria include AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0ps response time, ≤1µA reverse leakage above 10V, and thermal resistance (RθJA) of 55°C/W - critical for under-hood and high-reliability embedded power interface design.
Technical Context
The SMCJ18H employs a glass-passivated silicon junction optimized for fast transient suppression in unidirectional DC power lines. Its clamping behavior is defined by a 10/1000μs waveform per R.E.A., with peak pulse power rated at 1500W for tp = 1ms and derated linearly above 25°C ambient per Fig.2.
It operates within a junction temperature range of –55°C to +150°C and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked via cathode band on the DO-214AB case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail voltage. |
| VBR min/max | 20.0 / 24.4 V @ IT = 1 mA - Confirmed breakdown threshold ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 32.2 V @ 48 A - Clamping voltage limits downstream IC stress during 10/1000μs surge; enables robust 24V system protection. |
| PPK | 1500 W - Peak pulse power handling capacity supports ISO 7637-2 Pulse 5a (load dump) events in automotive environments. |
| IR @ VWM | ≤1 µA - Ultra-low leakage preserves battery life in always-on circuits and avoids false triggering in low-power sensors. |
| TJ max | +150 °C - Enables operation in under-hood or enclosed industrial enclosures without thermal derating penalties. |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, 0.210g weight, polarity indicated by cathode band. Designed for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Cathode-banded side opposite | Connected to system ground or low-side return path; defines unidirectional conduction direction. |
| Cathode | Transient clamp output / Marked side | Connected to protected line (e.g., 24V rail); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring zero-failure reliability over temperature and lifetime. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) test profiles - essential for 12V/24V vehicle networks. |
| Fast response time | <1.0 ps rise time from 0 V to VBR min - prevents voltage overshoot beyond IC absolute maximum ratings during nanosecond-scale ESD events. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, supporting IPC-J-STD-020 Level 1 moisture sensitivity rating. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V supply inputs in engine control modules against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24V rail and chassis ground to clamp surges up to 1500W without failure. Use Value: Limits transient voltage to ≤32.2V, safeguarding downstream PMICs and microcontrollers rated for 36V absolute max. | Use Scenario: Shielding digital input channels of programmable logic controllers from field-induced transients in factory automation wiring. IC Role / Device Role / Timing Role: Standoff protection device across input terminals to absorb inductive kickback from solenoid drivers and relay coils. Use Value: Withstands ≥48A peak impulse current while maintaining ≤1µA leakage - preserving signal integrity and reducing false triggers. |
| Telecom DC Power Interface | Renewable Energy Charge Controller |
Use Scenario: Safeguarding PoE-powered equipment front-end DC-DC converters from lightning-induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary clamping element on 48V bias rail, coordinated with upstream GDT and downstream π-filter. Use Value: 32.2V clamping voltage ensures converter ICs (e.g., TPS543x) remain within safe operating area during 10/1000μs threats. | Use Scenario: Protecting solar charge controller MOSFET gate drivers from voltage spikes caused by PV array switching and shading transients. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMCJ18H serves as unidirectional clamp on low-side driver return path. Use Value: 1500W peak power rating handles repetitive 200A surge currents per IEC 61000-4-5 Level 4 testing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | 600W rating, SMB package (smaller footprint), lower IPPM (24.7A), higher VC (29.2V) | Lower power handling limits use to non-load-dump scenarios like ESD-only protection on data lines | Select SMBJ18A only when board space is constrained and surge energy is ≤600W (e.g., USB or CAN bus protection). |
| 1.5KE18A | Through-hole TO-204AA (DO-41), 1500W, same VWM/VC, but slower response (~1ns) and no AEC-Q101 qualification | Lacks automotive qualification and surface-mount compatibility; unsuitable for automated assembly or under-hood use | Choose 1.5KE18A only for legacy through-hole designs where rework tolerance and cost outweigh AEC-Q101 and ISO 7637-2 needs. |
Compared with SMBJ18A and 1.5KE18A, the SMCJ18H delivers superior automotive-grade reliability, surface-mount scalability, and identical 1500W surge capacity in a thermally efficient DO-214AB package - making it the preferred choice for new 24V embedded systems requiring AEC-Q101 and ISO 7637-2 compliance.
Availability
SMCJ18H is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, and telecom power interfaces requiring stable component supply, AEC-Q101 qualification, and ISO 7637-2 Pulse compliance.
Supply support for SMCJ18H 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 high-reliability protection devices and power management components.
The SMCJ series belongs to TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for automotive and industrial power rail protection where fast clamping, low leakage, and thermal robustness are mandatory.
FAQ
What is the clamping voltage of the SMCJ18H at its rated peak pulse current?
The SMCJ18H has a maximum clamping voltage (VC) of 32.2 V at 48 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and ensures protected circuitry remains within safe voltage margins during standardized surge events. The SMCJ18H maintains this performance across its full operating temperature range of –55°C to +150°C.
Is the SMCJ18H suitable for bidirectional transient suppression?
No, the SMCJ18H is a unidirectional TVS diode, identified by its cathode band marking and specified electrical parameters for single-polarity operation. For bidirectional applications, Taiwan Semiconductor offers the SMCJ18AH variant (marked GET), which provides symmetrical clamping in both directions. Using SMCJ18H in a bidirectional configuration may result in forward conduction damage during negative transients.
Does the SMCJ18H meet automotive qualification standards?
Yes, the SMCJ18H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It is rated for junction temperatures up to +150°C and features glass-passivated junction construction, matte tin-plated leads, and JESD 201 Class 2 whisker resistance - all aligned with automotive electronics reliability mandates. The SMCJ18H is intended for use in engine control, body electronics, and ADAS power domains.
What is the reverse leakage current specification for the SMCJ18H?
The SMCJ18H exhibits a maximum reverse leakage current (IR) of 1 µA at its working stand-off voltage (VWM) of 18 V, tested at 25°C ambient. This ultra-low leakage supports battery-backed systems and low-power sensor nodes where standby current must be minimized. Leakage remains well below 10 µA even at elevated temperatures up to +125°C, as confirmed by thermal derating curves in the official datasheet.
How does the SMCJ18H compare to the SMBJ18A in terms of surge handling capability?
The SMCJ18H delivers 1500W peak pulse power versus 600W for the SMBJ18A - a 2.5× higher energy absorption capacity. This difference stems from the larger DO-214AB (SMC) package of the SMCJ18H, which enables higher IPPM (48 A vs. 24.7 A) and lower thermal resistance (RθJC = 10°C/W). As a result, the SMCJ18H is suitable for load-dump protection, while SMBJ18A is limited to ESD and lower-energy transients.
SMCJ18H 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 48A
- 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)
SMCJ18H FAQ
1.How can I place an order for SMCJ18H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18H 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 SMCJ18H reliable?
The price and inventory of SMCJ18H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18H is usually 5 days.
3.What payment methods are accepted for SMCJ18H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18H?
SMCJ18H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18H 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 SMCJ18H?
For technical support, including SMCJ18H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18H requirements.
6.How does Aetrix verify that SMCJ18H is sourced from the original manufacturer or authorized distributors?
All SMCJ18H 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 SMCJ18H meets industry standards.
7.What is the process for return or replacement of SMCJ18H?
All SMCJ18H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18H, 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 SMCJ18H part is unused and in its original packaging.
Return procedure for SMCJ18H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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