My Inquiry
My Account
Taiwan Semiconductor Corporation SMDJ12CAH
- Part No.:
- SMDJ12CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ12CAH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,242
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ12CAH from Taiwan Semiconductor is a bidirectional 3000W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 13.3V minimum breakdown voltage (VBR), 12V working stand-off voltage (VWM), and 19.9V maximum clamping voltage (VC) at 150.8A peak pulse current - designed for ESD and surge protection in automotive power line and industrial control interfaces.
For engineers reviewing the SMDJ12CAH datasheet, SMDJ12CAH pinout, SMDJ12CAH application, or SMDJ12CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1ps response time, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ12CAH implements a glass-passivated silicon junction optimized for high-energy transient suppression in both polarities. Its bidirectional configuration enables symmetrical clamping without polarity sensitivity, supporting robust protection against reverse-polarity surges and bipolar transients in DC bus lines.
It operates across –55°C to +175°C junction temperature range, with 15°C/W junction-to-lead thermal resistance enabling effective heat dissipation during repetitive 1ms pulses. The device 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 | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC operating margin. |
| VBR (min/max) | 13.3 V / 14.7 V @ 1 mA - Confirmed breakdown threshold ensures predictable turn-on under fast transients. |
| VC @ IPPM | 19.9 V @ 150.8 A - Clamping voltage limits downstream IC stress during 3000W 1ms surge events. |
| PPK | 3000 W - Peak pulse power rating per 1ms waveform (Fig.5); supports automotive load-dump immunity. |
| TJ max | +175 °C - High-temperature operation enables placement near power converters or under-hood environments. |
| RθJA | 75 °C/W - Thermal resistance allows ~40W steady-state dissipation on standard 1-in² copper pad at 25°C ambient. |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads; cathode band omitted due to bidirectional construction. Polarity marking not applicable - terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path (dual-directional) | Both terminals conduct equally during positive or negative transients; no polarity-dependent mounting required. |
| Case | Thermal conduction path | Exposed metal slug transfers heat to PCB copper; requires thermal pad connection for RθJA derating compliance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) waveforms. |
| Sub-1 ps response time | Enables clamping before sensitive logic or analog circuitry experiences overvoltage damage during ESD or lightning-induced spikes. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained supply chains. |
Applications
| Automotive Power Line Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp ±100V transients within 19.9V clamping limit. Use Value: Prevents latch-up or gate oxide rupture in CAN transceivers and microcontrollers by limiting voltage excursion below 20V. | Use Scenario: Shielding 24V digital input modules from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated input channel, absorbing >3000W energy without failure. Use Value: Eliminates need for external spark gaps or varistors, reducing BOM count while maintaining IEC 61000-4-5 Level 4 immunity. |
| Telecom DC Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: Safeguarding PoE-powered equipment from induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: Bidirectional clamping element between power rail and ground, responding in <1ps to fast-rising transients. Use Value: Maintains uninterrupted operation during lightning-induced common-mode surges up to 150A peak. | Use Scenario: Protecting MPPT controller MOSFET gates and sense amplifiers from solar array string transients. IC Role / Device Role / Timing Role: Transient shunt on PV input stage, rated for repeated 1ms 3000W pulses without parameter drift. Use Value: Extends system lifetime by preventing cumulative degradation of gate oxides and precision resistors under outdoor exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12CA | Lower PPK (1500W), higher VC (23.2V @ 82.5A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1 or high-energy load dump; limited to low-power signal lines | Select only when surge energy is ≤1500W and clamping voltage margin allows ≥23V. |
| SMLJ12CA | Same VWM/VBR, lower PPK (1500W), identical RθJA (75°C/W) | Cannot meet 3000W automotive load dump requirement; acceptable for industrial I/O with lower threat levels | Choose if cost sensitivity outweighs peak power headroom and full ISO 7637-2 coverage is not mandated. |
Compared with SAC12CA and SMLJ12CA, the SMDJ12CAH delivers double the peak pulse power (3000W vs. 1500W) and tighter clamping (19.9V vs. ≥23.2V), making it the only option among the three qualified for full ISO 7637-2 Pulse 1 compliance in 12V automotive systems.
Availability
SMDJ12CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, telecom power feeds, and renewable energy charge controllers requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMDJ12CAH 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 and automotive markets.
The SMDJ series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust thermal performance in surface-mount packages.
FAQ
What does the 'CAH' suffix indicate in SMDJ12CAH?
The 'CAH' suffix in SMDJ12CAH denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional 'AH' variants, the 'C' signifies symmetrical clamping in both polarities, enabling use without polarity consideration in DC bus protection. This matches the electrical specifications shown in the SMDJ12CAH row of the Electrical Specifications table, where VBR min/max and VC apply identically in either direction. The SMDJ12CAH maintains all mechanical and thermal ratings of the base SMDJ12AH family.
Is SMDJ12CAH suitable for ISO 7637-2 Pulse 1 testing?
Yes, SMDJ12CAH is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling). Its 3000W peak pulse power, 19.9V clamping voltage at 150.8A, and sub-1ps response time ensure compliance with the 12V system requirements defined in the standard. The datasheet confirms this under FEATURES and ELECTRICAL SPECIFICATIONS sections, with test conditions aligned to ISO 7637-2 waveform definitions.
What is the maximum clamping voltage of SMDJ12CAH and at what current is it specified?
The maximum clamping voltage of SMDJ12CAH is 19.9 V, measured at a peak pulse current (IPPM) of 150.8 A under 1 ms 10/1000 µs waveform conditions. This value is specified in the ELECTRICAL SPECIFICATIONS table for SMDJ12CAH and reflects worst-case clamping performance across process and temperature variation. It directly determines the voltage stress imposed on downstream components during surge events, making it critical for interface IC survivability.
Does SMDJ12CAH require special PCB layout considerations?
Yes, SMDJ12CAH requires a thermally enhanced PCB layout: a minimum 1-in² copper pad connected to both terminals via multiple thermal vias to internal ground planes is recommended to achieve the rated RθJA of 75°C/W. The DO-214AB (SMC) package has an exposed metal slug acting as the primary thermal path; insufficient copper area will cause junction temperature to exceed 175°C during repetitive surges. Trace inductance must also be minimized - keep traces short and wide between SMDJ12CAH and protected node.
How does SMDJ12CAH differ from SMDJ12AH in practical design use?
SMDJ12CAH is bidirectional while SMDJ12AH is unidirectional, meaning SMDJ12CAH clamps equally for positive and negative transients without polarity constraints, whereas SMDJ12AH requires correct anode/cathode orientation and only protects against reverse-polarity surges. SMDJ12CAH has identical VWM (12V), VBR (13.3–14.7V), and VC (19.9V) ratings but lacks a cathode band marking. Both share DO-214AB packaging, AEC-Q101 qualification, and ISO 7637-2 compliance - the choice depends solely on circuit polarity requirements.
SMDJ12CAH 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 150.8A
- 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)
SMDJ12CAH FAQ
1.How can I place an order for SMDJ12CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ12CAH 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 SMDJ12CAH reliable?
The price and inventory of SMDJ12CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ12CAH is usually 5 days.
3.What payment methods are accepted for SMDJ12CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ12CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ12CAH?
SMDJ12CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ12CAH 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 SMDJ12CAH?
For technical support, including SMDJ12CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ12CAH requirements.
6.How does Aetrix verify that SMDJ12CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ12CAH 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 SMDJ12CAH meets industry standards.
7.What is the process for return or replacement of SMDJ12CAH?
All SMDJ12CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ12CAH, 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 SMDJ12CAH part is unused and in its original packaging.
Return procedure for SMDJ12CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ12CAH 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…
