My Inquiry
My Account
Taiwan Semiconductor Corporation SMDJ18CAH
- Part No.:
- SMDJ18CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ18CAH.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ18CAH from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 18V working stand-off voltage (VWM), 20.0–22.1V breakdown voltage (VBR), and 29.2V maximum clamping voltage (VC) at 102.7A peak pulse current. It is AEC-Q101 qualified and designed for ESD and surge protection in automotive power electronics.
For engineers reviewing the SMDJ18CAH datasheet, SMDJ18CAH pinout, SMDJ18CAH application, or SMDJ18CAH equivalent, key selection criteria include bidirectional clamping performance, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 175°C junction temperature rating, moisture sensitivity level 1, and DO-214AB mechanical compatibility with automated SMT placement.
Technical Context
The SMDJ18CAH implements a glass-passivated silicon junction optimized for fast transient suppression, achieving sub-1.0ps response time. Its bidirectional configuration enables symmetrical clamping in both polarities without external circuitry, supporting robust protection against reverse-polarity surges and ESD events.
Designed to meet stringent automotive EMC requirements, the SMDJ18CAH sustains 3000W peak pulse power per 10/1000μs waveform and operates across –55°C to +175°C junction temperature range. Thermal resistance values (RθJA = 75°C/W, RθJL = 15°C/W) support reliable power dissipation in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 / 22.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 29.2 V - Clamped voltage at 102.7 A peak pulse current, limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling per 10/1000 μs waveform, critical for load-dump immunity |
| TJ max | +175 °C - Maximum junction temperature enabling under-hood automotive deployment |
| IR @ VWM | 1 µA - Low leakage ensures minimal standby power loss in battery-sensitive systems |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and matte tin leads |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with two coplanar terminals; polarity indicated by cathode band (not applicable for bidirectional SMDJ18CAH); meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Terminals are functionally symmetric; either terminal accepts positive or negative transients without polarity constraint |
| Case | Thermal conduction path | No electrical connection; serves as primary heat sink interface via PCB copper pour under body |
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 | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) waveforms |
| Sub-1.0 ps response time | Enables effective suppression of nanosecond-scale ESD events before sensitive ICs experience overstress |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow, reducing manufacturing cost and process complexity |
| Halogen-free construction | Complies with IEC 61249-2-21, supporting RoHS-compliant and environmentally regulated end equipment |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver lines from load-dump spikes during battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Bidirectional TVS clamps both positive and negative transients on shared signal/power rails without polarity dependency. Use Value: Limits clamping voltage to 29.2 V at 102.7 A, preventing damage to 3.3 V/5 V logic interfaces while meeting ISO 7637-2 Pulse 2b requirements. | Use Scenario: Shields 24 V DC digital input circuits from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Acts as primary front-end surge limiter upstream of optocoupler input stage. Use Value: 3000 W peak power rating absorbs repetitive 10/1000 μs transients common in factory automation environments. |
| Telecom Power Supply Front-End | Consumer USB-C Power Delivery Port |
Use Scenario: Guards AC/DC adapter secondary-side 12–24 V rails against lightning-induced surges entering via Ethernet or PoE lines. IC Role / Device Role / Timing Role: Standoff voltage (18 V) aligns with nominal rail, allowing clean operation until transient exceeds VWM. Use Value: 1 µA leakage at VWM minimizes quiescent current drain in always-on telecom infrastructure. | Use Scenario: Provides secondary-level ESD protection on VBUS line after buck-boost controller, complementing primary TPD4S012. IC Role / Device Role / Timing Role: Bidirectional clamping handles both hot-plug overshoot and reverse-voltage faults during cable insertion/removal. Use Value: Sub-1.0 ps response captures fast ESD events before USB PD controller can react, preserving port integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18CA | Lower PPK (1500 W), same VWM (18 V), higher VC (32.4 V), DO-214AA (SMB) package | Reduced surge margin; suitable only for non-automotive, lower-energy transients | Select when board space allows larger pitch or thermal budget is constrained |
| SMCJ18CA | Identical electrical specs (VWM/VBR/VC/PPK), same DO-214AB package, but not AEC-Q101 qualified | Lacks automotive qualification; requires additional system-level validation for vehicle use | Choose for industrial or consumer designs where AEC-Q101 is not mandated |
Compared with SAC18CA and SMCJ18CA, the SMDJ18CAH delivers certified automotive reliability, tighter clamping (29.2 V vs. 32.4 V), and full ISO 7637-2 coverage-making it the preferred choice for safety-critical 12 V/24 V vehicle subsystems requiring zero derating.
Availability
SMDJ18CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power supplies, and USB-C PD port protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMDJ18CAH 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 automotive-qualified components.
The SMDJ series was developed specifically for high-reliability automotive and industrial surge protection, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SMDJ18CAH under peak pulse conditions?
The SMDJ18CAH has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 102.7 A, measured using the standard 10/1000 μs waveform. This value ensures downstream components operating at ≤3.3 V or 5 V logic levels remain within safe voltage margins during transient events. The SMDJ18CAH maintains this clamping performance across its full operating temperature range.
Is the SMDJ18CAH suitable for automotive applications?
Yes, the SMDJ18CAH is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements, supports junction temperatures up to +175°C, and features moisture sensitivity level 1-enabling direct placement without baking. These attributes make the SMDJ18CAH appropriate for engine control units, body control modules, and infotainment power rails.
How does the bidirectional configuration of the SMDJ18CAH affect circuit design?
The SMDJ18CAH's bidirectional structure eliminates polarity constraints during layout-either terminal may connect to any node in the protected circuit. This simplifies routing in differential or AC-coupled paths and avoids errors from incorrect orientation. Unlike unidirectional TVS diodes, the SMDJ18CAH provides symmetrical clamping for both positive and negative transients without requiring external diode pairing or bias networks.
What is the thermal resistance profile of the SMDJ18CAH?
The SMDJ18CAH has a junction-to-ambient thermal resistance (RθJA) of 75°C/W and a junction-to-lead thermal resistance (RθJL) of 15°C/W, measured under standard JEDEC test conditions. Effective thermal management requires adequate PCB copper area beneath the DO-214AB body and thermal vias to internal ground planes. These values enable sustained operation at 6.5 W steady-state power dissipation when ambient temperature remains ≤25°C.
Does the SMDJ18CAH require special handling during PCB assembly?
No special handling is required for the SMDJ18CAH during PCB assembly. Its moisture sensitivity level is rated at Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without pre-baking. The matte tin-plated leads comply with J-STD-002 for solderability, and the DO-214AB package is compatible with standard SMT pick-and-place equipment and lead-free reflow profiles.
SMDJ18CAH 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 102.7A
- 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)
SMDJ18CAH FAQ
1.How can I place an order for SMDJ18CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ18CAH 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 SMDJ18CAH reliable?
The price and inventory of SMDJ18CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ18CAH is usually 5 days.
3.What payment methods are accepted for SMDJ18CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ18CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ18CAH?
SMDJ18CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ18CAH 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 SMDJ18CAH?
For technical support, including SMDJ18CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ18CAH requirements.
6.How does Aetrix verify that SMDJ18CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ18CAH 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 SMDJ18CAH meets industry standards.
7.What is the process for return or replacement of SMDJ18CAH?
All SMDJ18CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ18CAH, 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 SMDJ18CAH part is unused and in its original packaging.
Return procedure for SMDJ18CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ18CAH 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…
