My Inquiry
My Account
Taiwan Semiconductor Corporation TLD8S28CAH
- Part No.:
- TLD8S28CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S28CAH.pdf
- Description:
- 6600W, 32.75V, 5%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLD8S28CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 28 V working stand-off voltage, 31.1–34.4 V breakdown voltage at 5 mA, 45.4 V clamping voltage at 145 A (10/1000 µs), and 6600 W peak pulse power. It is AEC-Q101 qualified and designed for automotive load dump surge protection in 12 V/24 V systems.
For engineers reviewing the TLD8S28CAH datasheet, TLD8S28CAH pinout, TLD8S28CAH application, or TLD8S28CAH equivalent, key selection criteria include unidirectional vs. bidirectional polarity, clamping voltage margin relative to system rail, junction temperature capability up to 175 °C, and compliance with ISO 7637-2 and ISO 16750-2 surge waveforms.
Technical Context
The TLD8S28CAH implements a silicon avalanche diode structure optimized for high-energy transients, with junction passivation enabling stable operation at TJ = 175 °C. Its bidirectional configuration provides symmetrical clamping for AC-coupled or floating bus lines, and it meets IEC 61000-4-2 Level 4 and ISO 10605 L4 ESD immunity requirements.
Thermal performance is defined by RθJC = 0.8 °C/W under ideal heatsink conditions, supporting sustained surge handling in constrained automotive environments. The device operates across –55 °C to +175 °C storage and junction temperature ranges, with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| VBR (min/max) | 31.1 V / 34.4 V at 5 mA - Ensures reliable triggering above system nominal voltage with margin |
| VC @ IPPM | 45.4 V at 145 A (10/1000 µs) - Limits protected circuit voltage during worst-case load dump |
| PPPM | 6600 W (10/1000 µs) - Withstands automotive load dump surges per ISO 7637-2 Pulse 5a |
| TJ max | +175 °C - Enables placement near hot engine control units without derating |
| Package | DO-218AB - Surface-mount outline with 16.0 × 9.5 mm footprint and 5.5 mm height for high-power thermal mass |
| Standards | AEC-Q101 qualified; ISO 7637-2, ISO 16750-2, IEC 61000-4-2 Level 4, ISO 10605 L4 compliant |
Pinout & Package
DO-218AB package: molded plastic body with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 2.691 g, UL 94V-0 rated compound, JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry point in forward conduction mode | Enables bidirectional clamping: conducts during either polarity surge exceeding VBR |
| Cathode (Lead 2) | Current exit point in forward conduction mode; marked with band | Defines polarity reference; used for layout orientation and thermal pad alignment on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Clamps both positive and negative transients symmetrically-ideal for CAN, LIN, or sensor signal lines without DC bias |
| Junction passivation technology | Stabilizes leakage and breakdown characteristics over lifetime and temperature cycling, critical for automotive field reliability |
| 175 °C junction rating | Eliminates need for thermal derating in under-hood ECUs, supporting direct mounting on high-temp PCB areas |
| ISO 7637-2 Pulse 5a compliance | Validated for 12 V/24 V automotive load dump events up to 100 V, 400 ms duration with exponential decay |
| Moisture sensitivity level 1 | Zero floor life limitation-no baking required prior to reflow, simplifying SMT manufacturing |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail of engine control modules against alternator load dump surges. IC Role / Device Role: Primary TVS clamp placed upstream of DC-DC converter input. Use Value: Clamps transient to ≤45.4 V, preventing overvoltage damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding differential CAN FD bus lines from coupled ESD and fast transients in vehicle networks. IC Role / Device Role: Bidirectional line protector between transceiver and connector. Use Value: Symmetrical clamping preserves signal integrity while meeting ISO 10605 L4 (30 kV air, 15 kV contact) requirements. |
| Body Control Module (BCM) LIN Bus | ADAS Camera Power Rail |
Use Scenario: Securing single-wire LIN communication lines in door modules and lighting controllers. IC Role / Device Role: Low-capacitance bidirectional TVS on LIN physical layer. Use Value: Maintains <10 µA leakage at 12 V and clamps ±45.4 V, ensuring protocol timing compliance and noise immunity. | Use Scenario: Protecting 12 V input of high-resolution camera modules mounted near engine compartments. IC Role / Device Role: Front-end surge suppressor before buck converter and image sensor power domain. Use Value: Withstands repeated 6600 W pulses and operates reliably at 175 °C ambient, eliminating thermal shutdown risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA | Lower PPPM = 400 W (10/1000 µs); DO-214AC package; VC = 45.4 V same, but lower surge current rating (42.1 A) | Not suitable for ISO 7637-2 load dump; limited to ESD and low-energy spikes | Select only for non-automotive, low-risk signal-line protection where space constraints prohibit DO-218AB |
| SMCJ28CA | Same DO-214AB package as SMAJ but higher PPPM = 1500 W; VC = 45.4 V; RθJC not specified; no AEC-Q101 qualification | Lacks automotive qualification and thermal robustness for under-hood use; requires external heatsinking for sustained surges | Acceptable for industrial control panels with moderate surge exposure, but not for OEM automotive deployment |
Compared with SMAJ28CA and SMCJ28CA, the TLD8S28CAH delivers 4.4× higher peak power handling, guaranteed AEC-Q101 qualification, and validated thermal performance up to 175 °C-making it the only option qualified for front-end protection in production automotive ECUs.
Availability
TLD8S28CAH is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera power rails, and body control module LIN/CAN bus protection requiring stable component supply and long-term lifecycle assurance.
Supply support for TLD8S28CAH 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 Company (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power devices, TVS diodes, and automotive-qualified components.
The TLD8S series was developed specifically for high-reliability automotive surge protection, targeting ISO 7637-2 load dump and ISO 16750-2 supply transient compliance in engine bay and chassis-mounted ECUs.
FAQ
What is the polarity configuration of the TLD8S28CAH?
The TLD8S28CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive- and negative-polarity transients. Its marking code "TLD8S28A" and "CA" suffix confirm bidirectional functionality, and the cathode band identifies terminal orientation-not polarity direction-as both terminals behave identically under reverse bias.
Does the TLD8S28CAH meet AEC-Q101 stress test requirements?
Yes, the TLD8S28CAH is fully AEC-Q101 qualified. This includes passing high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (uHAST), and mechanical shock tests per the AEC-Q101 standard, confirming suitability for automotive under-hood applications with extended service life.
What is the maximum clamping voltage of the TLD8S28CAH under standard test conditions?
The TLD8S28CAH has a maximum clamping voltage VC of 45.4 V when subjected to a 10/1000 µs waveform at IPPM = 145 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuits during worst-case surge events.
Can the TLD8S28CAH be used in place of a unidirectional TVS like TLD8S28AH?
No-the TLD8S28CAH is not a drop-in replacement for TLD8S28AH. While both share identical VWM, VBR, and VC values, the unidirectional TLD8S28AH conducts only in reverse bias and blocks forward current, whereas the bidirectional TLD8S28CAH clamps in both directions. Substitution requires circuit-level validation of DC bias and signal polarity.
What is the thermal resistance from junction to case (RθJC) for the TLD8S28CAH?
The TLD8S28CAH has a typical junction-to-case thermal resistance RθJC of 0.8 °C/W, measured under ideal heatsink conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper pour or external heatsink, supporting repeated high-energy surge events without thermal runaway.
TLD8S28CAH 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 145A
- 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
TLD8S28CAH FAQ
1.How can I place an order for TLD8S28CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S28CAH 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 TLD8S28CAH reliable?
The price and inventory of TLD8S28CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S28CAH is usually 5 days.
3.What payment methods are accepted for TLD8S28CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S28CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S28CAH?
TLD8S28CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S28CAH 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 TLD8S28CAH?
For technical support, including TLD8S28CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S28CAH requirements.
6.How does Aetrix verify that TLD8S28CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S28CAH 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 TLD8S28CAH meets industry standards.
7.What is the process for return or replacement of TLD8S28CAH?
All TLD8S28CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S28CAH, 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 TLD8S28CAH part is unused and in its original packaging.
Return procedure for TLD8S28CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLD8S28CAH 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…
