My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ28CH
- Part No.:
- SMCJ28CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CH.pdf
- Description:
- 1500W, 34.6V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,383
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ28CH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode 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. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the SMCJ28CH datasheet, SMCJ28CH pinout, SMCJ28CH application, or SMCJ28CH equivalent, this device serves as a robust, RoHS-compliant, halogen-free TVS for unidirectional/bidirectional surge suppression in automotive power lines, industrial I/O ports, and telecom interfaces where fast response (<1.0 ps), low leakage (<1 µA @ 28V), and high reliability under -55°C to +150°C operation are required.
Technical Context
The SMCJ28CH employs a glass-passivated junction for stable breakdown characteristics and low leakage. Its bidirectional configuration enables symmetrical clamping in both polarities without external polarity management, supporting direct integration into differential signal lines or AC-coupled rails.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling sustained operation up to TJ = 150°C. The device handles non-repetitive 1ms pulses per Fig.5 waveform and derates linearly above 25°C ambient per Fig.2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 V / 34.4 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM |
| VC @ IPPM | 45.4 V @ 34 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 2b (load dump) |
| PPK | 1500 W - Peak pulse power rating supports single-event transients up to 10/1000 µs waveform |
| IR @ VWM | <1 µA - Negligible standby leakage preserves battery life in always-on automotive modules |
| TJ max | +150 °C - Enables placement near hot components (e.g., power converters, engine control units) |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 0.210 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMCJ28CH); meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry (negative polarity) | Accepts reverse surge energy during negative transients; symmetric with Cathode for bidirectional operation |
| Cathode (Lead 2) | Transient current entry (positive polarity) | Accepts reverse surge energy during positive transients; functionally identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| ISO 7637-2 compliance | Guaranteed clamping performance against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (switching noise) |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments |
| Fast response time | <1.0 ps rise time enables suppression before sensitive logic or analog circuitry sustains damage |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing and end-of-life handling |
Applications
| Automotive Power Line Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN node power rails and microcontroller supply inputs from load-dump transients and jump-start surges in passenger vehicles. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and DC-DC input, absorbing >1500W pulses without failure. Use Value: Prevents brownout resets and latch-up in 3.3V/5V MCUs by limiting rail voltage to ≤45.4V during 12V system load dump events. | Use Scenario: Shielding PLC digital input modules from induced surges on 24V field wiring exposed to motor switching noise and lightning coupling. IC Role / Device Role / Timing Role: Bidirectional shunt protector across input terminals, conducting fault current to ground while maintaining signal integrity. Use Value: Eliminates need for external polarity selection circuitry due to inherent symmetry, reducing BOM count and PCB area vs. unidirectional TVS pairs. |
| Telecom Interface Surge Suppression | Consumer Equipment ESD Hardening |
Use Scenario: Safeguarding Ethernet PHY power pins and RS-485 transceiver VCC rails against ESD and fast transients in outdoor base station equipment. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary gas discharge tube (GDT), providing low-clamping refinement for sub-100ns threats. Use Value: Achieves <45.4V clamping at 34A, ensuring PHY ICs rated for 3.3V/5V operation remain within absolute maximum ratings during IEC 61000-4-5 10/700µs surges. | Use Scenario: Reinforcing USB-C port VBUS line and HDMI hot-swap detection circuits against human-body-model (HBM) ESD events in smart TVs and set-top boxes. IC Role / Device Role / Timing Role: Fast-response shunt clamp integrated directly at connector footprint, minimizing trace inductance impact on clamping efficiency. Use Value: Delivers <1 µA leakage at 28V, avoiding standby current penalties in battery-backed or energy-efficient consumer devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA | Lower PPK (600W), same VWM/VBR/VC specs, SMB package (smaller footprint, higher RθJA) | Not suitable for ISO 7637-2 Pulse 2b (load dump) due to lower energy handling | Select when space-constrained and transient energy is limited to IEC 61000-4-2/4-5 Level 3 |
| 1.5KE27CA | Through-hole TO-218 package, 1500W rating, but slower response (>1 ns) and no AEC-Q101 qualification | Requires manual assembly; unsuitable for automated SMT lines or automotive qualification programs | Choose only for legacy through-hole designs where rework tolerance and cost outweigh AEC-Q101 requirements |
Compared with SMBJ28CA and 1.5KE27CA, the SMCJ28CH delivers automotive-grade reliability, surface-mount scalability, and verified ISO 7637-2 compliance-making it the sole option among the three qualified for front-end protection in ASIL-B automotive ECUs.
Availability
SMCJ28CH is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ28CH 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 Company (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series was developed specifically for high-energy transient suppression in automotive power networks and industrial control systems, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability.
FAQ
What does the "CH" suffix indicate in SMCJ28CH?
The "CH" suffix in SMCJ28CH denotes a bidirectional configuration with common-cathode internal structure-enabling symmetrical clamping in both polarities without external polarity marking. This differs from "H" (unidirectional) and "AH" (tighter VBR tolerance) variants. SMCJ28CH is explicitly listed in the datasheet's bipolar devices table and shares the same 31.1–34.4V VBR range and 45.4V VC as its unidirectional counterpart SMCJ28H.
Is SMCJ28CH compatible with lead-free reflow soldering processes?
Yes, SMCJ28CH supports lead-free reflow soldering per J-STD-002. Its matte tin-plated leads are rated for peak temperatures up to 260°C for 10 seconds, and the DO-214AB molding compound meets UL 94V-0 flammability requirements. Moisture sensitivity level is rated at Level 1 (unlimited floor life at ≤30°C/85% RH), eliminating bake requirements prior to assembly.
Does SMCJ28CH meet automotive EMC test requirements beyond ISO 7637-2?
SMCJ28CH is validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, which cover conducted transients in 12V/24V vehicle systems. While not certified to ISO 11452 (radiated immunity) or CISPR 25 (emissions), its fast clamping (<1.0 ps) and low capacitance (<100 pF typical at 1 MHz) minimize signal distortion-supporting robust EMC design when used per layout guidelines in TSC Application Note AN-SMCJ.
How does the thermal resistance of SMCJ28CH affect PCB layout?
With RθJA = 55°C/W and RθJC = 10°C/W, SMCJ28CH requires adequate copper pour (≥100 mm² per lead) beneath the DO-214AB pads to achieve rated 1500W pulse handling. Layouts omitting thermal vias or using narrow traces will elevate junction temperature, reducing surge endurance. TSC recommends ≥2 thermal vias per pad connected to inner ground planes for automotive-grade thermal performance.
Can SMCJ28CH be used in parallel to increase surge current capacity?
No-SMCJ28CH should not be paralleled. Minor VBR mismatches between units cause current imbalance, leading to premature failure of the lower-VBR device. For higher current capability, select a higher-rated part (e.g., SMCJ33CH) or use a TVS array with matched dies. TSC explicitly advises against paralleling in Section 4 of the SMCJ datasheet due to lack of guaranteed matching.
SMCJ28CH 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ28CH FAQ
1.How can I place an order for SMCJ28CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CH 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 SMCJ28CH reliable?
The price and inventory of SMCJ28CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CH is usually 5 days.
3.What payment methods are accepted for SMCJ28CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CH?
SMCJ28CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CH 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 SMCJ28CH?
For technical support, including SMCJ28CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CH requirements.
6.How does Aetrix verify that SMCJ28CH is sourced from the original manufacturer or authorized distributors?
All SMCJ28CH 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 SMCJ28CH meets industry standards.
7.What is the process for return or replacement of SMCJ28CH?
All SMCJ28CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CH, 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 SMCJ28CH part is unused and in its original packaging.
Return procedure for SMCJ28CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
