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Taiwan Semiconductor Corporation SMCJ28AH
- Part No.:
- SMCJ28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,265
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Product details
Overview
SMCJ28AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 28V working stand-off voltage (VWM), 31.1–34.4V breakdown voltage (VBR), and 45.4V maximum clamping voltage (VC) at 34A 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 SMCJ28AH datasheet, SMCJ28AH pinout, SMCJ28AH application, or SMCJ28AH equivalent, this device is selected for high-energy surge immunity where AEC-Q101 qualification, sub-1ps response time, <1µA leakage above 10V, and UL 94V-0 molding compound are critical design requirements.
Technical Context
The SMCJ28AH uses a glass-passivated silicon junction optimized for fast transient suppression, delivering clamping action within typically less than 1.0ps from 0V to VBR(min). Its unidirectional configuration supports DC-biased lines with cathode-band polarity marking and exhibits 10°C/W junction-to-case thermal resistance for reliable power dissipation during repetitive surges.
Designed per ANSI/IEEE C62.35, it meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump), and Pulse 3a/3b (capacitive coupling and supply line spikes), with peak pulse power rated at 1500W for 1ms, derated linearly above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail voltage. |
| VBR @ IT=1mA | 31.1–34.4 V - Breakdown threshold range; ensures consistent turn-on across production lots under standardized test conditions. |
| VC @ IPPM=34A | 45.4 V - Clamped voltage during 10/1000μs surge; defines worst-case overvoltage seen by protected downstream circuitry. |
| PPK | 1500 W - Peak pulse power handling for 1ms waveform; enables robust protection against high-energy automotive transients. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering in low-power systems. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity marked by cathode band. Weight: 0.210 g. Meets JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-banded end is cathode) | Connected to protected signal or power line; reverse-biased during normal operation. |
| Cathode | Ground/reference side (marked by band) | Connected to system ground or low-impedance return path; conducts surge current to reference plane during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Qualified for automotive applications per stress test requirements including HTOL, TC, UHAST, and ESD - enables use in engine control, body electronics, and ADAS modules without requalification. |
| Glass passivated junction | Provides stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure - critical for industrial equipment deployed in harsh environments. |
| ISO 7637-2 compliance | Validated against Pulse 1 (−150V/0.5Ω), Pulse 2a (+100V), Pulse 2b (−100V), Pulse 3a/3b (±50V); eliminates need for additional external filtering in 12V/24V vehicle architectures. |
| Fast response time <1.0ps | Clamps before sensitive ICs experience damaging overvoltage - protects CAN transceivers, microcontrollers, and sensor front-ends from ESD and fast-rising transients. |
Applications
| Automotive Power Rail Protection | Industrial I/O Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load-dump transients up to +120V per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and upstream fuse or DC-DC converter input. Use Value: Limits clamped voltage to 45.4V at 34A, preventing damage to 36V-rated input stages while surviving 1500W surge energy. | Use Scenario: RS-485/RS-232 ports on PLCs subjected to lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Line-side TVS on differential bus lines referenced to chassis ground. Use Value: Sub-1ps response ensures clamping occurs before transceiver ICs latch-up; 45.4V VC preserves signal integrity for 3.3V/5V logic interfaces. |
| Telecom DC Power Input Protection | Consumer Equipment Surge Immunity |
Use Scenario: 24V PoE-powered access points with external AC/DC adapters vulnerable to mains-coupled surges. IC Role / Device Role / Timing Role: Primary-level TVS on DC input before primary-side controller and bulk capacitor. Use Value: 1500W PPK rating handles 10/1000μs surges up to 34A; UL 94V-0 package prevents flame propagation in enclosed telecom housings. | Use Scenario: USB-C PD input stage in portable monitors subjected to ESD events per IEC 61000-4-2 ±15kV contact discharge. IC Role / Device Role / Timing Role: Secondary-level TVS on VBUS line after EMI filter and before buck controller. Use Value: <1µA IR at 28V ensures no standby current penalty; 45.4V clamping protects 30V-rated MOSFETs and gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPK (400W), smaller SMA package (DO-214AC), higher VC (48.4V @ 12.3A) | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy ESD and capacitive coupling events. | Select SMCJ28AH when 1500W surge handling and AEC-Q101 qualification are required; SMAJ28A fits space-constrained non-automotive designs. |
| TPSMD28 | Same DO-214AB package, 1500W rating, but VBR = 31.1–34.4V (identical), VC = 45.4V (identical), AEC-Q101 qualified | No functional difference; identical electrical specs and qualification status per datasheet revision A2102. | TPSMD28 is a direct form-fit-function alternative with identical performance; verify latest lifecycle status and traceability documentation prior to sourcing. |
Compared with SMAJ28A and TPSMD28, the SMCJ28AH delivers equal clamping performance and automotive qualification as TPSMD28 but exceeds SMAJ28A's energy handling by 275%, making it the only choice for full ISO 7637-2 compliance in 12V/24V systems.
Availability
SMCJ28AH is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O protection, telecom power inputs, and consumer equipment surge immunity requiring stable component supply across extended production cycles.
Supply support for SMCJ28AH 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 since 1979.
The SMCJ series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial applications demanding high-reliability surge immunity, fast response, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of SMCJ28AH at its rated peak pulse current?
The SMCJ28AH has a maximum clamping voltage (VC) of 45.4 V at 34 A peak impulse current (IPPM), measured using the 10/1000 μs standard surge waveform per IEC 61000-4-5 and ANSI/IEEE C62.35. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in the Electrical Specifications table on page 3 of the A2102 datasheet.
Is SMCJ28AH unidirectional or bidirectional, and how is polarity identified?
The SMCJ28AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number suffix. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end is the cathode and must be connected toward the system ground or reference plane. Bidirectional variants use "CH" or "CAH" suffixes and exhibit symmetrical clamping in both directions.
Does SMCJ28AH meet AEC-Q101 requirements for automotive use?
Yes, SMCJ28AH is explicitly qualified to AEC-Q101 Rev D for stress testing including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and human-body-model ESD. This qualification is stated in the FEATURES section of the A2102 datasheet and verified through TSC's internal qualification reports - enabling use in engine control units, body control modules, and ADAS sensors.
What is the maximum steady-state power dissipation (PD) for SMCJ28AH at 25°C ambient?
The SMCJ28AH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency reverse-bias conditions - not transient surges. For pulsed operation, the 1500W peak pulse power (PPK) rating governs short-duration energy handling, with derating required above 25°C per Figure 2 in the datasheet.
How does the SMCJ28AH compare to SMCJ28H in terms of breakdown voltage tolerance?
The SMCJ28AH has a tighter VBR tolerance: 31.1–34.4 V (min–max) at IT = 1 mA, versus SMCJ28H's wider 31.1–38.0 V range. This narrower spread improves consistency in clamping onset across production lots and simplifies margin analysis in safety-critical designs where predictable turn-on voltage is essential - such as in redundant power monitoring circuits.
SMCJ28AH 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 34A
- 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)
SMCJ28AH FAQ
1.How can I place an order for SMCJ28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AH 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 SMCJ28AH reliable?
The price and inventory of SMCJ28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28AH is usually 5 days.
3.What payment methods are accepted for SMCJ28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AH?
SMCJ28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AH 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 SMCJ28AH?
For technical support, including SMCJ28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AH requirements.
6.How does Aetrix verify that SMCJ28AH is sourced from the original manufacturer or authorized distributors?
All SMCJ28AH 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 SMCJ28AH meets industry standards.
7.What is the process for return or replacement of SMCJ28AH?
All SMCJ28AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AH, 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 SMCJ28AH part is unused and in its original packaging.
Return procedure for SMCJ28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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