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Taiwan Semiconductor Corporation SMDJ28AH
- Part No.:
- SMDJ28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ28AH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,387
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Product details
Overview
SMDJ28AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with a working stand-off voltage of 28 V, breakdown voltage range of 31.1–34.4 V at 1 mA test current, and clamping voltage of 45.4 V at 66.1 A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial ESD/transient protection in power rails and signal lines.
For engineers reviewing the SMDJ28AH datasheet, SMDJ28AH pinout, SMDJ28AH application, or SMDJ28AH equivalent, key selection criteria include its 3000 W peak pulse power rating, 45.4 V clamping voltage at 66.1 A, -55°C to +175°C operating junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking per cathode band.
Technical Context
The SMDJ28AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 31.1–34.4 V breakdown threshold, clamping transients to ≤45.4 V within <1.0 ps. Its glass-passivated junction ensures stable leakage (<1 µA at 28 V) and robust surge handling under repetitive or single-event conditions.
Thermally, it features a junction-to-lead resistance of 15 °C/W and junction-to-ambient resistance of 75 °C/W, enabling reliable operation up to 175 °C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 31.1–34.4 V - Voltage at which device enters avalanche breakdown; defines minimum trigger threshold |
| VC @ IPPM=66.1 A | 45.4 V - Clamped voltage during 10/1000 µs transient; determines protected circuit's maximum stress level |
| PPK | 3000 W - Peak pulse power dissipation capability for 1 ms non-repetitive surges |
| IPPM | 66.1 A - Maximum peak impulse current the device can safely divert without failure |
| TJ max | +175 °C - Maximum allowable junction temperature; supports high-ambient automotive/industrial environments |
| RθJL | 15 °C/W - Low thermal resistance from junction to lead enables efficient heat transfer to PCB copper |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.290 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS placement |
| Cathode | Reverse-biased clamping terminal | Marked with band; connected to protected line (e.g., 28 V rail or signal); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ISO 7637-2 compliance | Withstands standardized automotive load-dump and switching transient waveforms (Pulse 1/2a/2b/3a/3b) |
| Glass passivated junction | Ensures stable VBR tolerance, low leakage (<1 µA), and long-term parameter stability |
| Fast response time | <1.0 ps - Limits voltage overshoot during nanosecond-scale ESD events |
| Moisture sensitivity Level 1 | No bake requirement prior to reflow; compatible with standard J-STD-020 SMT processes |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs (e.g., body control modules) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground to clamp surges above 28 V. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers (PLCs) powered from 24 V industrial supplies exposed to inductive switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input, upstream of filtering and regulation stages. Use Value: Absorbs 3000 W pulses without degradation, maintaining system uptime in harsh factory environments. |
| Telecom Interface Port Protection | Consumer Equipment DC Adapter Input |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station backhaul units from lightning-induced surges on 24–48 V auxiliary rails. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC bias rails feeding interface ICs. Use Value: Fast <1.0 ps response prevents latch-up in sensitive communication ICs during fast-rising transients. | Use Scenario: Securing AC/DC adapter outputs powering smart home hubs and gateways with 24 V nominal inputs. IC Role / Device Role / Timing Role: Final-stage transient suppression before LDOs and SoCs. Use Value: Halogen-free, RoHS-compliant construction meets global consumer safety and environmental regulations. |
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 SMAJ28A | Same DO-214AC (SMA) package; 3000 W rating; VC = 45.7 V @ 65.6 A; slightly higher clamping voltage | Lower power density due to larger thermal resistance (RθJA ≈ 90 °C/W vs. SMDJ28AH's 75 °C/W) | Preferred where existing SMA footprint is fixed and thermal margin is sufficient |
| ON Semiconductor 1.5SMC28A | DO-214AB (SMC) package; identical footprint; VC = 45.4 V @ 66.1 A; same clamping performance but no AEC-Q101 qualification | Lacks automotive qualification; not validated for ISO 7637-2 Pulse 5a (load dump) | Cost-sensitive industrial designs where AEC-Q101 is not required |
Compared with SMAJ28A and 1.5SMC28A, the SMDJ28AH offers identical clamping performance and SMC footprint while adding AEC-Q101 qualification and superior thermal resistance-making it the optimal choice for automotive-critical 24 V rail protection where reliability and thermal efficiency are prioritized.
Availability
SMDJ28AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom infrastructure, and consumer power adapters requiring stable component supply and full traceability.
Supply support for SMDJ28AH 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.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial systems demanding AEC-Q101 reliability and ISO 7637-2 compliance.
FAQ
What is the maximum clamping voltage of the SMDJ28AH under standard test conditions?
The SMDJ28AH has a maximum clamping voltage (VC) of 45.4 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 66.1 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during transient events. The SMDJ28AH maintains this clamping performance across its specified operating temperature range, making it suitable for use in environments where voltage margin is critical.
Is the SMDJ28AH suitable for bidirectional transient protection?
No, the SMDJ28AH is a unidirectional TVS diode intended for DC rail protection with defined polarity. For bidirectional applications, the SMDJ28CAH variant must be used-it features symmetrical breakdown in both directions and is marked with "DFG" code. The SMDJ28AH has a cathode band marking and conducts only in reverse bias; using it in AC or floating-signal paths without proper polarity alignment may result in unintended conduction or failure.
Does the SMDJ28AH meet automotive qualification standards?
Yes, the SMDJ28AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its qualification covers temperature cycling, high-temperature reverse bias (HTRB), and mechanical robustness per automotive stress profiles. This makes the SMDJ28AH appropriate for engine control units, body electronics, and ADAS modules where certified reliability is mandatory.
What is the thermal resistance from junction to lead (RθJL) for the SMDJ28AH?
The SMDJ28AH has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard JEDEC test conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper via the leads, supporting sustained power dissipation in compact layouts. When mounted on 1-in² 2-oz copper with thermal vias, the SMDJ28AH can sustain higher average power than comparable devices with RθJL > 20 °C/W.
How does the SMDJ28AH compare to the SMAJ28A in terms of package and mounting compatibility?
The SMDJ28AH uses the DO-214AB (SMC) package, while the SMAJ28A uses DO-214AC (SMA). Though both are surface-mount, the SMC package is larger (7.11 × 6.22 mm vs. 4.57 × 2.92 mm) and requires different pad layout and stencil design. The SMDJ28AH cannot be substituted for SMAJ28A without PCB revision. However, its larger size contributes to lower RθJA (75 °C/W vs. ~90 °C/W), improving thermal performance in high-power applications.
SMDJ28AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMDJ28AH FAQ
1.How can I place an order for SMDJ28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ28AH 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 SMDJ28AH reliable?
The price and inventory of SMDJ28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ28AH is usually 5 days.
3.What payment methods are accepted for SMDJ28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ28AH?
SMDJ28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ28AH 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 SMDJ28AH?
For technical support, including SMDJ28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ28AH requirements.
6.How does Aetrix verify that SMDJ28AH is sourced from the original manufacturer or authorized distributors?
All SMDJ28AH 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 SMDJ28AH meets industry standards.
7.What is the process for return or replacement of SMDJ28AH?
All SMDJ28AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ28AH, 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 SMDJ28AH part is unused and in its original packaging.
Return procedure for SMDJ28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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