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Taiwan Semiconductor Corporation SMDJ28CA
- Part No.:
- SMDJ28CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ28CA.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,299
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Product details
Overview
SMDJ28CA from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 28 V, breakdown voltage range 31.1–34.4 V, and clamping voltage of 45.4 V at 66.1 A peak pulse current. It is designed for ESD and surge protection in DC power rails and signal lines of industrial control systems, automotive electronics, and telecom interfaces.
For engineers reviewing the SMDJ28CA datasheet, SMDJ28CA pinout, SMDJ28CA application, or SMDJ28CA equivalent, key selection criteria include its DO-214AB (SMC) package, bidirectional polarity, 175 °C maximum junction temperature, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and sub-1 ps response time - all critical for robust transient immunity in high-reliability embedded designs.
Technical Context
The SMDJ28CA employs a glass-passivated silicon junction optimized for fast clamping under high-energy transients. Its bidirectional configuration enables symmetrical suppression of positive and negative polarity surges without external polarity management.
It delivers 3000 W peak pulse power (10/1000 µs waveform), supports steady-state dissipation up to 6.5 W at 25 °C, and features thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation in compact PCB layouts with limited airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC bias margin. |
| VBR @ IT=1 mA | 31.1–34.4 V - Voltage at which device transitions from high-impedance to low-impedance clamping; ensures predictable turn-on during transients. |
| VC @ IPPM=66.1 A | 45.4 V - Clamped voltage during 3000 W surge; determines maximum stress on downstream ICs. |
| PPK | 3000 W - Peak pulse power handling (10/1000 µs waveform); qualifies for ISO 7637-2 Pulse 3b and lightning-induced surges. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures without derating. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.3 mm height; compatible with automated pick-and-place. |
Pinout & Package
DO-214AB (SMC) package: dual-leaded, molded plastic case with cathode band marking for unidirectional variants; SMDJ28CA is bidirectional and marked with "DFG" code - no polarity marking required. Leads are matte tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically - no fixed anode/cathode; enables placement without orientation check. |
| Case | Non-electrical mechanical body | UL 94V-0 rated molding compound; provides insulation and mechanical stability during reflow and board flex. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Sub-1 ps response time | Clamps ESD events (IEC 61000-4-2) before sensitive logic or analog circuitry is damaged. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive switching transients without external filtering. |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; supports standard SMT assembly without special handling. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC power inputs against load dump and relay coil flyback in PLC I/O modules and servo drive controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly across input terminals upstream of DC-DC converters. Use Value: Limits transient voltage to ≤45.4 V during 3000 W surges, preventing damage to 36 V-rated input-stage MOSFETs and gate drivers. | Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to battery transients in door modules and lighting control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, leveraging symmetry to handle both positive and negative pulses. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 2a (inductive switch-off) by clamping within 1 ps and dissipating energy without latch-up. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input rail protection for PoE-powered remote radio units and base station backhaul equipment operating from 24–48 V DC supplies. IC Role / Device Role / Timing Role: Standoff-rated TVS deployed at DC input connector to absorb lightning-induced surges coupled via long outdoor cabling. Use Value: Withstands 66.1 A peak impulse current while holding clamped voltage below 45.4 V - preserving 50 V-rated DC-DC controller ICs. | Use Scenario: DC-link protection in solar microinverters where PV string voltages reach 60–100 V and grid-side transients propagate through isolation barriers. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control side, coordinated with primary MOVs to provide staged clamping. Use Value: Fast 1 ps response complements slower MOVs, reducing let-through energy to <10 mJ - protecting isolated gate drivers and MCU power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC28CA (Littelfuse) | Same 28 V VWM, 3000 W PPK, but DO-214AB package with slightly higher VC = 47.0 V at 65.2 A. | Marginally higher clamping voltage reduces headroom for 36 V-rated components. | Select when Littelfuse supply chain alignment or legacy BOM compatibility is prioritized over minimal clamping voltage. |
| SMCJ28CA (ON Semiconductor) | Identical VWM, VBR, and PPK, but VC = 45.7 V at 65.8 A; RθJA = 70 °C/W vs. 75 °C/W for SMDJ28CA. | Negligible clamping difference; 5 °C/W better thermal performance allows marginally higher ambient operation. | Prefer for thermally constrained layouts where junction temperature rise must be minimized at full power. |
Compared with SAC28CA and SMCJ28CA, the SMDJ28CA offers the lowest clamping voltage (45.4 V) among the three, delivering tighter overvoltage protection for 36 V-rated downstream circuitry - a decisive advantage in space-constrained industrial and automotive power rail designs.
Availability
SMDJ28CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for SMDJ28CA 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, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.
The SMDJ series is part of TSC's high-power surface-mount TVS platform, engineered specifically for ISO 7637-2-compliant automotive and harsh-environment industrial surge protection with emphasis on repeatable clamping performance and JEDEC-compliant packaging.
FAQ
What is the maximum clamping voltage of the SMDJ28CA under a 3000 W transient?
The SMDJ28CA has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 66.1 A - corresponding to the standardized 10/1000 µs waveform delivering 3000 W. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMDJ28CA maintains this clamping performance across its full operating temperature range.
Does the SMDJ28CA require orientation during PCB placement?
No - the SMDJ28CA is a bidirectional TVS diode with symmetrical terminal behavior, meaning either lead can serve as anode or cathode depending on transient polarity. Unlike unidirectional variants (e.g., SMDJ28A), it carries no cathode band marking and may be placed in either orientation on the PCB. This simplifies automated assembly and eliminates orientation-related assembly errors in high-volume production.
Is the SMDJ28CA compliant with automotive transient standards?
Yes - the SMDJ28CA is explicitly tested and rated to meet ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b, covering common automotive electrical disturbances including load dump, alternator field decay, inductive switching, and capacitive coupling. Its 3000 W peak power rating and fast sub-1 ps response make it suitable for front-end protection in body control modules, infotainment power supplies, and sensor interface circuits.
What is the moisture sensitivity level (MSL) of the SMDJ28CA and how does it affect assembly?
The SMDJ28CA has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without baking prior to reflow soldering. This eliminates pre-bake steps, reduces floor life constraints, and supports standard SMT assembly flow - a key advantage for high-mix, low-volume production and rapid prototyping environments using the SMDJ28CA.
How does the thermal performance of the SMDJ28CA compare to similar 3000 W TVS diodes?
The SMDJ28CA exhibits a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values are typical for DO-214AB-packaged 3000 W TVS diodes. When mounted on a 1-in² 2-oz copper pad with two thermal vias, the SMDJ28CA achieves comparable steady-state thermal performance to SMCJ28CA and SAC28CA - enabling reliable 6.5 W continuous dissipation in industrial ambient temperatures up to 85 °C.
SMDJ28CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ28CA FAQ
1.How can I place an order for SMDJ28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ28CA 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 SMDJ28CA reliable?
The price and inventory of SMDJ28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ28CA is usually 5 days.
3.What payment methods are accepted for SMDJ28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ28CA?
SMDJ28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ28CA 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 SMDJ28CA?
For technical support, including SMDJ28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ28CA requirements.
6.How does Aetrix verify that SMDJ28CA is sourced from the original manufacturer or authorized distributors?
All SMDJ28CA 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 SMDJ28CA meets industry standards.
7.What is the process for return or replacement of SMDJ28CA?
All SMDJ28CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ28CA, 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 SMDJ28CA part is unused and in its original packaging.
Return procedure for SMDJ28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ28CA Tags
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