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Taiwan Semiconductor Corporation SMDJ28CAH
- Part No.:
- SMDJ28CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ28CAH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,973
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Product details
Overview
SMDJ28CAH 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 AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching transient protection.
For engineers reviewing the SMDJ28CAH datasheet, SMDJ28CAH pinout, SMDJ28CAH application, or SMDJ28CAH equivalent, key selection criteria include bidirectional clamping performance, DO-214AB (SMC) package compatibility, 175 °C max junction temperature, and compliance with automotive ESD/transient immunity standards.
Technical Context
The SMDJ28CAH implements a glass-passivated silicon avalanche junction optimized for fast transient suppression in bidirectional signal and power lines. Its sub-1 ps response time enables effective clamping of ESD events and lightning-induced surges before downstream circuitry is damaged.
Designed for automotive-grade reliability, it supports operation from –55 °C to +175 °C, features moisture sensitivity level 1 per J-STD-020, and delivers 3000 W peak pulse power (10/1000 µs waveform) with 45.4 V clamping voltage at 66.1 A IPPM - critical for protecting CAN, LIN, and sensor interfaces against ISO 7637-2-compliant transients.
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 - guaranteed avalanche breakdown threshold at 1 mA test current |
| VC @ IPPM | 45.4 V - clamped voltage during 66.1 A 10/1000 µs surge, limiting stress on protected ICs |
| PPK | 3000 W - peak pulse power handling capability under standardized transient conditions |
| TJ max | +175 °C - enables use in under-hood automotive environments without thermal derating |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, informs PCB copper area requirements |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity marking required; conducts equally in both directions during overvoltage events |
| Case (cathode band absent) | Thermal and mechanical interface | DO-214AB body provides mechanical stability and aids heat dissipation via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronic modules requiring zero-failure reliability across temperature cycling and humidity exposure |
| ISO 7637-2 compliance | Guaranteed suppression of Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge) |
| Glass-passivated junction | Enhances long-term stability and leakage control under high-humidity and thermal stress conditions |
| Moisture sensitivity level 1 | Enables direct placement without baking or dry-pack handling, reducing manufacturing overhead |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Node |
|---|---|
Use Scenario: Protecting microcontroller I/O and LIN transceivers from battery line transients during ignition and load dump. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power rail and ground, absorbing energy before it reaches sensitive analog/digital inputs. Use Value: Limits voltage to ≤45.4 V during 66.1 A surges, preventing latch-up or permanent damage to 5 V or 3.3 V logic interfaces. | Use Scenario: Shielding RS-485/CAN transceivers in factory automation PLCs from ESD and inductive switching noise on field wiring. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on differential bus lines (CAN_H/CAN_L), maintaining signal integrity during EMC testing. Use Value: Clamps common-mode transients within 1 ps, preserving bit error rate (BER) and enabling pass/fail compliance with IEC 61000-4-2/4-4/4-5. |
| Automotive Infotainment Power Input | Smart Sensor Interface Protection |
Use Scenario: Safeguarding USB-C PD controller and audio codec power rails against jump-start surges and alternator ripple. IC Role / Device Role / Timing Role: Primary front-end TVS on 12 V input stage, coordinated with upstream fuse and downstream LDOs. Use Value: Withstands 3000 W pulses without degradation, ensuring system-level robustness across 15-year vehicle service life. | Use Scenario: Protecting MEMS pressure sensor analog outputs and I²C lines in engine oil monitoring systems exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA @ 28 V) bidirectional clamp on sensor supply and data lines. Use Value: Maintains <1 µA reverse leakage at 28 V stand-off, avoiding signal offset errors while delivering 45.4 V clamping during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC28CA | Lower PPK (1500 W), higher VC (49.9 V @ 30 A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1 (load dump); limited to lower-energy ESD and capacitive coupling transients | Select only when peak surge current remains below 30 A and clamping margin allows ≥49.9 V |
| SMLJ28CA | Same VWM/VBR/VC specs, but rated for 3000 W with tighter VC tolerance (±5 % vs ±8 %), RoHS/halogen-free identical | Identical functional coverage including AEC-Q101 and ISO 7637-2; preferred where tighter clamping consistency is required | Drop-in alternative if tighter VC distribution improves system-level margin verification |
Compared with SAC28CA and SMLJ28CA, the SMDJ28CAH offers the highest surge current rating (66.1 A) and lowest clamping voltage (45.4 V) in its voltage class, making it optimal for automotive load-dump protection where energy absorption and voltage headroom are critical.
Availability
SMDJ28CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial CAN networks, and smart sensor interfaces requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMDJ28CAH 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 global automotive and industrial certifications.
The SMDJ series was developed specifically for high-energy transient suppression in harsh automotive environments, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability.
FAQ
What does the "CAH" suffix indicate in SMDJ28CAH?
The "CAH" suffix denotes a bidirectional configuration - meaning the SMDJ28CAH functions identically in both forward and reverse bias, with no cathode marking required. This distinguishes it from unidirectional variants like SMDJ28AH, which feature a cathode band and conduct only in reverse. The SMDJ28CAH is specified for symmetric clamping across both polarities, essential for protecting AC-coupled or differential signal lines.
Is SMDJ28CAH compliant with automotive qualification standards?
Yes, the SMDJ28CAH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - including glass-passivated junction, MSL Level 1 handling, and –55 °C to +175 °C operating range - satisfies automotive electronics reliability mandates. Full qualification documentation is available upon request for SMDJ28CAH.
What is the clamping voltage of SMDJ28CAH and how is it measured?
The SMDJ28CAH has a maximum clamping voltage (VC) of 45.4 V at 66.1 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by downstream circuitry during worst-case surge events, and is guaranteed across temperature and lifetime - a key parameter for validating protection margins in designs using SMDJ28CAH.
Can SMDJ28CAH replace SMDJ28AH in an existing design?
No - SMDJ28CAH is bidirectional while SMDJ28AH is unidirectional. Replacing SMDJ28AH with SMDJ28CAH requires verifying that the circuit does not rely on DC blocking or polarity-sensitive conduction. In most power-rail protection applications, the substitution is acceptable, but in signal-line or rectifier-assisted configurations, reverse leakage and conduction behavior must be re-evaluated for SMDJ28CAH.
What package type does SMDJ28CAH use and what are its mounting requirements?
SMDJ28CAH uses the DO-214AB (SMC) surface-mount package, with dimensions per JEDEC MS-013. Recommended pad layout follows TSC's suggested footprint: 2.5 mm × 5.5 mm solder pads with 2.3 mm center-to-center spacing. Thermal relief and adequate copper area (≥100 mm² per terminal) are advised to maintain RθJA ≤75 °C/W and sustain 3000 W pulse ratings - critical for reliable SMDJ28CAH operation in high-temperature environments.
SMDJ28CAH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ28CAH FAQ
1.How can I place an order for SMDJ28CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ28CAH 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 SMDJ28CAH reliable?
The price and inventory of SMDJ28CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ28CAH is usually 5 days.
3.What payment methods are accepted for SMDJ28CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ28CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ28CAH?
SMDJ28CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ28CAH 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 SMDJ28CAH?
For technical support, including SMDJ28CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ28CAH requirements.
6.How does Aetrix verify that SMDJ28CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ28CAH 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 SMDJ28CAH meets industry standards.
7.What is the process for return or replacement of SMDJ28CAH?
All SMDJ28CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ28CAH, 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 SMDJ28CAH part is unused and in its original packaging.
Return procedure for SMDJ28CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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