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Taiwan Semiconductor Corporation SMCJ51CAH
- Part No.:
- SMCJ51CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAH.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
SMCJ51CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 51V working stand-off voltage (VWM), 56.7–62.7V breakdown voltage (VBR), and 82.4V maximum clamping voltage (VC) at 19A peak pulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ51CAH datasheet, SMCJ51CAH pinout, SMCJ51CAH application, or SMCJ51CAH equivalent, this AEC-Q101 qualified TVS offers verified bidirectional clamping, <1.0ps response time, <1μA reverse leakage above 10V, UL 94V-0 molding, and JESD201 Class 2 whisker resistance - critical for ESD-hardened CAN/LIN bus nodes, 12V/24V DC power inputs, and high-reliability sensor signal conditioning.
Technical Context
The SMCJ51CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional configurations. Its clamping behavior is defined across 10/1000μs surge waveforms per R.E.A., with thermal performance characterized by RθJC = 10°C/W and RθJA = 55°C/W - enabling sustained operation up to TJ = +150°C under pulsed conditions.
Electrical specifications are validated per ANSI/IEEE C62.35, with VBR tested at 1mA IT, and IR measured at full VWM. The CAH suffix confirms bipolar symmetry: identical VBR, VC, and IPPM in both directions - eliminating polarity dependency in differential line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; sets system-level overvoltage threshold for 12V/24V automotive and industrial supplies. |
| VBR min/max | 56.7 V / 62.7 V @ 1 mA - Validated breakdown range ensures consistent turn-on across production lots and temperature extremes (-55°C to +150°C). |
| VC @ IPPM | 82.4 V @ 19 A - Clamping voltage during 10/1000μs surge defines worst-case voltage seen by protected ICs; enables safe margin below 100V-rated components. |
| PPK | 1500 W - Peak pulse power rating determines survivability against ISO 7637-2 Pulse 5a (load dump) and lightning-induced surges on long cables. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Response time | <1.0 ps - Sub-picosecond junction response ensures clamping activation before transient energy couples into downstream circuitry. |
| Package | DO-214AB (SMC) - Surface-mount outline with 0.210 g mass, matte tin-plated leads, and J-STD-002 solderability - compatible with automated reflow and wave soldering. |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case with cathode band marking; bidirectional configuration means both terminals are functionally symmetric - no anode/cathode distinction required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional transient path | Connects to protected line (e.g., CAN_H or +12V rail); conducts surge current equally in either direction during overvoltage events. |
| Terminal 2 | Bidirectional transient path | Connects to reference plane (e.g., CAN_L or chassis ground); completes low-inductance return path for clamped current without polarity constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and powertrain applications including temperature cycling, humidity bias, and mechanical shock testing. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements without external filtering. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives - critical for industrial equipment exposed to condensation or cleaning agents. |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement prior to reflow; supports standard SMT assembly without special handling protocols. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance mandates for global OEM supply chains. |
Applications
| Automotive CAN Bus Protection | Industrial 24V Power Input |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines in vehicle body control modules against battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching CAN transceiver. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 2b (50V/2Ω) events while preserving <1μA leakage to avoid bus bias shift. |
Use Scenario: Safeguarding PLC I/O power rails against induced surges from motor contactor switching in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp across +24V and GND, coordinated with upstream fuse and downstream LDO. Use Value: Limits transient voltage to ≤82.4V during 1500W 10/1000μs surges - preventing damage to 36V-rated DC-DC controllers and microcontrollers. |
| Telecom DSL Line Interface | Medical Sensor Signal Conditioning |
Use Scenario: Shielding ADSL/VDSL line drivers from lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: First-stage protector mounted at RJ-11 jack, followed by gas discharge tube and series impedance. Use Value: Responds in <1.0ps to clamp 6kV/3kA surges to ≤82.4V, reducing stress on secondary protection and analog front-end amplifiers. |
Use Scenario: Securing analog outputs of patient-monitoring ECG/SpO₂ sensors connected to hospital-grade power distribution systems. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) bidirectional clamp on ±5V signal lines to prevent ESD damage during cable hot-plug events. Use Value: Enables Class II medical device certification by meeting IEC 61000-4-2 Level 4 (15kV air/8kV contact) without compromising signal fidelity. |
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 SMAJ51CA | Same DO-214AC (SMA) package; lower PPK (400W); VBR 56.7–62.7V; VC = 87.1V @ 9.2A | Lower surge capacity limits use to sub-ISO 7637-2 environments (e.g., consumer USB ports) | Select when board space is constrained and peak surge energy is ≤400W - not suitable for automotive load dump. |
| ON Semiconductor 1.5KE51CA | Through-hole DO-201AE package; PPK = 1500W; VBR 56.7–62.7V; VC = 84.5V @ 17.7A; higher thermal resistance | Requires manual or wave soldering; unsuitable for high-density SMT layouts | Choose only for legacy through-hole designs where rework tolerance and hand-soldering access are prioritized over automated assembly. |
Compared with SMAJ51CA and 1.5KE51CA, the SMCJ51CAH delivers identical clamping performance in a surface-mount DO-214AB package with AEC-Q101 qualification and ISO 7637-2 compliance - making it the only option qualified for automotive-grade SMT production without derating or secondary protection.
Availability
SMCJ51CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and telecom base station power supplies requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMCJ51CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers - with ISO/TS 16949 certification and global distribution infrastructure.
The SMCJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive and industrial environments - emphasizing robustness, repeatable clamping, and compatibility with automated SMT assembly processes.
FAQ
What does the "CAH" suffix indicate in SMCJ51CAH?
The "CAH" suffix in SMCJ51CAH denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional variants (e.g., SMCJ51H), the CAH version provides symmetrical clamping in both polarities - essential for protecting differential buses like CAN or RS-485 without polarity-sensitive placement. This is confirmed in the official TSC datasheet revision A2102, Section "Devices for bipolar applications".
Is SMCJ51CAH compliant with ISO 7637-2 for automotive applications?
Yes, SMCJ51CAH explicitly meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as stated in the TSC datasheet (page 1, FEATURES section). Its 1500W peak power rating and 82.4V clamping voltage at 19A ensure robust protection against load-dump transients and inductive switching noise in 12V/24V vehicle electrical systems - validated under AEC-Q101 stress conditions.
What is the maximum clamping voltage (VC) for SMCJ51CAH and at what test condition?
The maximum clamping voltage (VC) for SMCJ51CAH is 82.4 V, measured at a peak pulse current (IPPM) of 19 A using the standardized 10/1000 μs double-exponential waveform per R.E.A. definition (Fig.5 in the datasheet). This value represents the worst-case voltage imposed on protected circuitry during a full-energy transient event - critical for ensuring downstream ICs remain within absolute maximum ratings.
Does SMCJ51CAH require special handling due to moisture sensitivity?
No, SMCJ51CAH has a J-STD-020 Moisture Sensitivity Level (MSL) of 1 - meaning it has unlimited floor life and requires no baking or dry-pack handling prior to reflow soldering. This simplifies manufacturing logistics and eliminates yield loss from moisture-related popcorning, as confirmed in the "MECHANICAL DATA" section of the TSC datasheet (page 1).
How does the thermal resistance of SMCJ51CAH impact its surge capability?
SMCJ51CAH features RθJC = 10°C/W and RθJA = 55°C/W, enabling efficient heat transfer from junction to case and ambient. Under repetitive surge conditions, this allows sustained operation at TJ ≤ +150°C - critical for applications like industrial motor drives where multiple transients occur in rapid succession. Derating curves (Fig.2) confirm >80% PPK retention at 75°C ambient.
SMCJ51CAH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 19A
- 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)
SMCJ51CAH FAQ
1.How can I place an order for SMCJ51CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAH 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 SMCJ51CAH reliable?
The price and inventory of SMCJ51CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CAH is usually 5 days.
3.What payment methods are accepted for SMCJ51CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAH?
SMCJ51CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAH 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 SMCJ51CAH?
For technical support, including SMCJ51CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAH requirements.
6.How does Aetrix verify that SMCJ51CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAH 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 SMCJ51CAH meets industry standards.
7.What is the process for return or replacement of SMCJ51CAH?
All SMCJ51CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAH, 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 SMCJ51CAH part is unused and in its original packaging.
Return procedure for SMCJ51CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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