My Inquiry
My Account
Taiwan Semiconductor Corporation TLD8S18CAH
- Part No.:
- TLD8S18CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S18CAH.pdf
- Description:
- 6600W, 21.05V, 5%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLD8S18CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-218AB package, designed for automotive load dump and surge protection. It features 18.0 V working stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 5 mA, 29.2 V clamping voltage (VC) at 226 A peak impulse current, and 6600 W peak pulse power (10/1000 µs), meeting ISO 7637-2 and AEC-Q101 requirements.
For engineers reviewing the TLD8S18CAH datasheet, TLD8S18CAH pinout, TLD8S18CAH application, or TLD8S18CAH equivalent, key selection criteria include unidirectional/bidirectional configuration, DO-218AB thermal performance (RθJC = 0.8 °C/W), TJ = −55 to +175 °C operation, and compliance with ISO 16750-2 and IEC 61000-4-2 Level 4.
Technical Context
The TLD8S18CAH is a bidirectional TVS diode optimized for high-energy transients in 12 V and 24 V automotive electrical systems. Its junction passivation design enables stable operation up to TJ = 175 °C, and it meets ISO 7637-2 Pulse 5a/b (load dump) and ISO 16750-2 surge immunity requirements under defined test conditions.
It delivers 6600 W non-repetitive peak impulse power with 10/1000 µs waveform and 5200 W with 10/10000 µs waveform, while maintaining low leakage (≤10 µA at VWM, ≤150 µA at TJ = 175 °C) and a temperature coefficient of VBR = 0.083 %/°C - enabling predictable voltage clamping across wide thermal ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 20.0 / 22.1 V at IT = 5 mA - ensures reliable turn-on above system nominal voltage |
| VC @ IPPM | 29.2 V at 226 A (10/1000 µs) - limits downstream voltage stress during load dump events |
| PPPM (10/1000 µs) | 6600 W - sustains high-energy surges without failure in automotive power nets |
| TJ max | +175 °C - supports under-hood placement in modern engine control units |
| RθJC | 0.8 °C/W - enables effective heatsinking to maintain safe junction temperature |
| αT (VBR) | 0.083 %/°C - allows accurate clamping voltage prediction across temperature |
Pinout & Package
Package: DO-218AB molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity marked by cathode band. Weight ≈ 2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode-banded end) | Reverse-biased terminal for bidirectional clamping | Enables symmetrical surge suppression in AC-coupled or floating bus lines |
| Cathode (marked end) | Reference terminal for voltage standoff and clamping | Defines polarity marking per JEDEC DO-218AB; used for orientation verification on PCB |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Bidirectional configuration | Protects both polarities of supply rails or data lines without external circuitry |
| Junction passivation technology | Reduces leakage drift and improves long-term stability under thermal stress |
| ISO 7637-2 & ISO 16750-2 compliance | Guarantees survivability against standardized automotive load dump and surge waveforms |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, simplifying SMT assembly |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Lines |
|---|---|
Use Scenario: Protects 12 V power rail of engine control unit against load dump surges up to 120 V and 400 ms duration. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC/DC converter input. Use Value: Limits input voltage to ≤29.2 V during 226 A transients, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Shields bidirectional CAN FD physical layer transceivers from coupled surges on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) bidirectional clamp on CAN_H/CAN_L differential pair. Use Value: Maintains signal integrity while suppressing ±30 kV ESD (IEC 61000-4-2 Level 4) and ISO 16750-2 fast transients. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Secures 12 V input to image sensor module in front-facing ADAS camera exposed to alternator-induced spikes. IC Role / Device Role / Timing Role: Standoff-rated protector with 18.0 V VWM to avoid false triggering during normal battery fluctuations. Use Value: Clamps 6600 W pulses without degradation, ensuring uninterrupted video stream during ignition cycles. | Use Scenario: Guards gate driver ICs and MOSFETs in EPS motor control board against inductive kickback and load dump. IC Role / Device Role / Timing Role: High-current (226 A IPPM) transient suppressor mounted near power stage connectors. Use Value: Absorbs 5200 W (10/10000 µs) surges without thermal runaway, preserving steering assist functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Lower PPPM (400 W), SMA package, RθJC ≈ 45 °C/W, VBR = 20.0–22.2 V | Not suitable for sustained load dump; limited to low-energy ESD/surge events | Select TLD8S18CAH when >1 kW surge handling or AEC-Q101 qualification is required |
| TPSMD18CA | DO-214AB package, PPPM = 3000 W (10/1000 µs), VBR = 20.0–22.2 V, TJ = 150 °C | Lacks full ISO 7637-2 compliance; lower thermal capability limits duty-cycle operation | Choose TLD8S18CAH for under-hood applications requiring 175 °C operation and certified load dump immunity |
Compared with SMAJ18CA and TPSMD18CA, the TLD8S18CAH delivers 2.2× higher peak power handling, 25 °C higher junction rating, and documented ISO 7637-2 Pulse 5a/b validation - making it the only option among the three qualified for primary load dump protection in modern automotive ECUs.
Availability
TLD8S18CAH is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera modules, and electric power steering systems requiring stable component supply with AEC-Q101 traceability and long-lifecycle support.
Supply support for TLD8S18CAH 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 TLD8SxxCAH series is part of TSC's AEC-Q101-certified transient protection portfolio, engineered specifically for high-energy load dump suppression in 12 V/24 V automotive power networks.
FAQ
What is the polarity configuration of the TLD8S18CAH?
The TLD8S18CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Its DO-218AB package uses a cathode band marking, but unlike unidirectional devices, both terminals behave identically under reverse and forward surge conditions - critical for protecting differential buses like CAN or LIN where polarity reversal may occur.
Does the TLD8S18CAH meet ISO 7637-2 Pulse 5a and 5b requirements?
Yes, the TLD8S18CAH is explicitly validated to meet ISO 7637-2 Pulse 5a (12 V system, 120 V/400 ms) and Pulse 5b (24 V system, 200 V/400 ms) load dump specifications under defined test conditions. Its 6600 W (10/1000 µs) and 5200 W (10/10000 µs) ratings directly support these waveforms, and its TJ = 175 °C rating ensures thermal survival during extended pulse durations.
What is the maximum clamping voltage of the TLD8S18CAH at rated peak current?
The TLD8S18CAH has a maximum clamping voltage VC of 29.2 V at IPPM = 226 A with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - essential for ensuring downstream ICs remain within absolute maximum ratings.
How does the temperature coefficient of VBR affect TLD8S18CAH performance?
The TLD8S18CAH exhibits a typical VBR temperature coefficient αT of 0.083 %/°C. Using the formula VBR@TJ = VBR@25°C × (1 + αT × (TJ − 25)), its breakdown voltage increases predictably with junction temperature - e.g., rising from 21.05 V at 25 °C to ~23.1 V at 175 °C. This ensures consistent overvoltage protection margin across the full operating range.
Is the TLD8S18CAH compatible with lead-free reflow soldering processes?
Yes, the TLD8S18CAH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads comply with J-STD-002 for solderability, and its moisture sensitivity level (MSL) is rated Level 1 per J-STD-020 - meaning it can be stored indefinitely at ambient conditions without baking prior to assembly, supporting standard Pb-free reflow profiles up to 260 °C peak.
TLD8S18CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-218AB
- Series:
- -
- 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):
- 226A
- Power - Peak Pulse:
- 6600W (6.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
TLD8S18CAH FAQ
1.How can I place an order for TLD8S18CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S18CAH 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 TLD8S18CAH reliable?
The price and inventory of TLD8S18CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S18CAH is usually 5 days.
3.What payment methods are accepted for TLD8S18CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S18CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S18CAH?
TLD8S18CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S18CAH 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 TLD8S18CAH?
For technical support, including TLD8S18CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S18CAH requirements.
6.How does Aetrix verify that TLD8S18CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S18CAH 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 TLD8S18CAH meets industry standards.
7.What is the process for return or replacement of TLD8S18CAH?
All TLD8S18CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S18CAH, 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 TLD8S18CAH part is unused and in its original packaging.
Return procedure for TLD8S18CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLD8S18CAH 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…
