My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ85CAH
- Part No.:
- SMCJ85CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAH.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,028
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ85CAH from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 85V working stand-off voltage (VWM), 94.4–104V breakdown voltage (VBR), and 137V maximum clamping voltage (VC) at 11.5A peak pulse current - designed to protect automotive power lines and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ85CAH datasheet, SMCJ85CAH pinout, SMCJ85CAH application, or SMCJ85CAH equivalent, this device delivers AEC-Q101 qualification, sub-1ps response time, <1µA reverse leakage above 10V, glass-passivated junction, and bidirectional ESD/transient immunity for robust front-end protection in harsh environments.
Technical Context
The SMCJ85CAH operates as a bidirectional avalanche diode, symmetrically clamping voltage surges in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance and low leakage across temperature, while its DO-214AB thermal design supports 10°C/W junction-to-case resistance and 55°C/W junction-to-ambient resistance under standard PCB mounting.
It meets ISO 7637-2 test pulses for automotive load-dump and inductive switching immunity, with clamping performance validated at 10/1000µs waveform per REA standards. The device sustains 1500W peak pulse power for 1ms and maintains operation from –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 94.4 V / 104 V @ IT = 1 mA - Ensures reliable avalanche conduction onset within tight tolerance |
| VC @ IPPM | 137 V @ 11.5 A - Clamped voltage during 10/1000µs surge limits downstream stress |
| PPK | 1500 W - Peak pulse power handling capability for transient suppression compliance |
| IR @ VWM | <1 µA - Minimal leakage preserves signal integrity and system quiescent current |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial enclosures |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient return path (bidirectional) | Connects to protected line; conducts during negative surges relative to cathode reference |
| Cathode (Lead 2) | Transient return path (bidirectional) | Connects to protected line; conducts during positive surges - identical function to Anode due to symmetrical construction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| ISO 7637-2 compliant | Passes Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (capacitive coupling) waveforms |
| Fast response time | <1.0 ps from 0 V to VBR min - enables clamping before sensitive ICs experience overvoltage damage |
| Glass passivated junction | Improves long-term stability of VBR and IR under thermal/humidity stress vs. epoxy-passivated alternatives |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT assembly logistics |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and ground, absorbing up to 1500W surges. Use Value: Limits rail voltage to ≤137V during 10/1000µs pulses, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Shielding 24V digital input modules in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS connected across input terminal and common, suppressing ±1kV EFT bursts. Use Value: Maintains functional integrity during repetitive 5kHz EFT events by clamping without degradation or latch-up. |
| Telecom DC Power Feeds | Renewable Energy Inverter Control Boards |
Use Scenario: Safeguarding PoE-powered equipment and telecom rectifier outputs against lightning-induced surges on -48V DC feeds. IC Role / Device Role / Timing Role: Secondary-level protection after primary gas discharge tube, handling residual fast-rising transients. Use Value: Sub-1ps response captures steep-fronted surges missed by slower primary protectors, reducing let-through energy. | Use Scenario: Protecting microcontroller GPIOs and isolated gate drivers on solar inverter control boards exposed to grid-switching transients. IC Role / Device Role / Timing Role: Point-of-use TVS on isolated DC-DC bias rails and sensor interface lines. Use Value: Withstands repeated 1500W pulses without parameter shift, ensuring long-term reliability in unattended installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA | 600W PPK rating, same VWM/VBR/VC but lower surge capacity; DO-214AA package (smaller footprint) | Lower energy handling suits consumer electronics or low-risk industrial I/O, not automotive load dump | Select when board space is constrained and peak surge energy remains ≤600W |
| 1.5KE85CA | Through-hole TO-218 package, 1500W rating, same VWM/VBR/VC specs, but slower thermal recovery and no AEC-Q101 qualification | Lacks automotive qualification and surface-mount compatibility; suited for legacy or non-automotive high-energy systems | Choose only for through-hole designs where AEC-Q101 is not required and manual assembly is acceptable |
Compared with SMBJ85CA and 1.5KE85CA, the SMCJ85CAH provides superior surge robustness in a compact SMT package with automotive-grade qualification - making it the optimal choice for space-constrained, high-reliability 12V/24V power rail protection where ISO 7637-2 compliance is mandatory.
Availability
SMCJ85CAH is available at Aetrix Electronics and suitable for automotive ECU power line protection, industrial PLC I/O hardening, and telecom DC feed surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCJ85CAH 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 protection devices.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in surface-mount packages.
FAQ
What does the "CAH" suffix indicate in SMCJ85CAH?
The "CAH" suffix denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and high-reliability process (H). Unlike unidirectional variants (e.g., SMCJ85H), the SMCJ85CAH clamps transients of either polarity symmetrically, eliminating need for polarity-aware layout - critical for protecting AC-coupled or floating lines.
How does SMCJ85CAH differ from SMCJ85AH?
The SMCJ85AH is unidirectional with a cathode band marking and forward voltage specification (VF = 5.0 V @ 100 A); the SMCJ85CAH is bidirectional with no polarity marking and identical electrical behavior in both directions. This makes SMCJ85CAH suitable for applications where voltage polarity is undefined or reversible, such as differential bus lines or dual-supply interfaces.
Is SMCJ85CAH compatible with lead-free reflow soldering?
Yes, SMCJ85CAH is RoHS compliant and rated for moisture sensitivity level 1 per J-STD-020, meaning it can be subjected to standard lead-free reflow profiles (peak 260°C) without baking. Its matte tin-plated leads meet J-STD-002 solderability requirements, ensuring reliable wetting and joint formation.
What is the clamping voltage of SMCJ85CAH under a 10/1000µs surge?
The maximum clamping voltage VC of SMCJ85CAH is 137 V at 11.5 A peak pulse current (IPPM), measured using the standardized 10/1000µs double-exponential waveform defined by R.E.A. This value guarantees that downstream components see no more than 137 V during worst-case transients meeting ISO 7637-2 Pulse 5a requirements.
Does SMCJ85CAH require derating at elevated ambient temperatures?
Yes, SMCJ85CAH must be derated above TA = 25°C per Figure 2 in the datasheet: its 1500W peak pulse power decreases linearly to zero at +150°C ambient. At 85°C ambient, maximum PPK drops to approximately 900W - design margins must account for this thermal limitation when sizing PCB copper area and airflow.
SMCJ85CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 11.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ85CAH FAQ
1.How can I place an order for SMCJ85CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAH 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 SMCJ85CAH reliable?
The price and inventory of SMCJ85CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAH is usually 5 days.
3.What payment methods are accepted for SMCJ85CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAH?
SMCJ85CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAH 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 SMCJ85CAH?
For technical support, including SMCJ85CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAH requirements.
6.How does Aetrix verify that SMCJ85CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAH 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 SMCJ85CAH meets industry standards.
7.What is the process for return or replacement of SMCJ85CAH?
All SMCJ85CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAH, 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 SMCJ85CAH part is unused and in its original packaging.
Return procedure for SMCJ85CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85CAH 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…
