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Taiwan Semiconductor Corporation SMDJ85AH
- Part No.:
- SMDJ85AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ85AH.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,274
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Product details
Overview
SMDJ85AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with a working stand-off voltage of 85 V, breakdown voltage range of 94.4–104 V, and clamping voltage of 137 V at 21.9 A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial surge protection against ISO 7637-2 pulses.
For engineers reviewing the SMDJ85AH datasheet, SMDJ85AH pinout, SMDJ85AH application, or SMDJ85AH equivalent, key selection criteria include clamping performance under 10/1000 µs transients, junction temperature rating up to +175 °C, compliance with automotive ESD and load-dump immunity standards, and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMDJ85AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its breakdown threshold (94.4–104 V), diverting transient energy to ground while clamping the protected line to ≤137 V. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at 85 V).
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and supports fast response (<1.0 ps), enabling protection of CAN, LIN, and sensor interfaces in automotive ECUs. Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting sustained operation at elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 94.4–104 V - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage |
| VC @ IPPM=21.9 A | 137 V - Clamped voltage during 10/1000 µs transient; defines maximum stress on downstream ICs |
| PPK | 3000 W - Peak pulse power handling per single 1 ms transient; enables robust load-dump suppression |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood automotive deployment without derating |
| RθJA | 75 °C/W - Thermal resistance to ambient; informs heatsinking requirements for repeated surge events |
| IR @ VWM | ≤1 µA - Reverse leakage at 85 V; minimizes standby power loss in always-on circuits |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for polarity identification. Matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Weight: 0.290 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-banded end is cathode) | Connected to protected signal or power rail; conducts transient current toward ground when clamped |
| Cathode | Ground reference / clamp return path | Must be routed to low-impedance chassis or power ground to maintain clamping integrity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| ISO 7637-2 compliance | Guarantees protection against real-world automotive transients including load dump (Pulse 5a/b) and inductive switching |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
| UL 94V-0 molding compound | Self-extinguishing encapsulation required for under-hood and safety-critical applications |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V CAN bus lines and microcontroller I/O pins from battery load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L and ground to clamp transients below transceiver absolute maximum ratings. Use Value: Limits clamped voltage to 137 V, well below typical CAN transceiver breakdown (±40 V common-mode), preventing latch-up or permanent damage. | Use Scenario: Safeguarding 24 V DC digital input channels against field-wiring surges and inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Primary surge shunt on each input channel, mounted adjacent to connector entry point. Use Value: Absorbs 3000 W peak pulses without degradation, maintaining signal integrity and eliminating need for secondary protection stages. |
| Telecom Power Supply Front-End | EV Onboard Charger (OBC) Auxiliary Power Rail |
Use Scenario: Guarding AC/DC adapter input rectifier stage against lightning-induced surges on telecom site power feeds. IC Role / Device Role / Timing Role: Secondary-level TVS after MOV, providing precise clamping and fast response where MOVs exhibit latency. Use Value: Sub-1 ps response time ensures clamping initiates before MOV thermal runaway, improving overall system survivability. | Use Scenario: Protecting 12 V auxiliary supply feeding MCU, gate drivers, and communication ICs in OBC control board. IC Role / Device Role / Timing Role: Unidirectional clamping device on 12 V rail, referenced to isolated ground plane. Use Value: Rated for +175 °C junction temperature, enabling direct mounting near heat-generating power stages without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85 | Lower PPK (1500 W), higher VC (150 V @ 12.5 A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 5 (load dump); limited to lower-energy transients | Select SMDJ85AH when 3000 W peak power and 137 V clamping are required for automotive load-dump immunity. |
| 1.5KE85A | Through-hole DO-201 package, identical VWM/VBR/VC, but no AEC-Q101 qualification | Not approved for automotive production; unsuitable for automated SMT lines | Choose SMDJ85AH for surface-mount manufacturing, AEC-Q101 compliance, and thermal performance in compact layouts. |
Compared with SAC85 and 1.5KE85A, the SMDJ85AH delivers higher surge capacity, lower clamping voltage, and automotive-grade qualification-making it the preferred choice for space-constrained, high-reliability 12 V/24 V systems requiring ISO 7637-2 compliance.
Availability
SMDJ85AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power front-ends, and EV onboard charger auxiliary supplies requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ85AH 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, and rectifiers, with global distribution and AEC-Q101-qualified product lines.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial environments where reliability, fast response, and standardized SMT compatibility are critical.
FAQ
What is the maximum clamping voltage of the SMDJ85AH under standard test conditions?
The SMDJ85AH has a maximum clamping voltage (VC) of 137 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 21.9 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The SMDJ85AH maintains this clamping performance consistently due to its glass-passivated junction and AEC-Q101-qualified construction.
Is the SMDJ85AH suitable for bidirectional transient protection?
No, the SMDJ85AH is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, Taiwan Semiconductor offers the SMDJ85CAH variant, which provides symmetrical clamping in both directions. Using the SMDJ85AH in reverse-biased configurations risks permanent damage, as its forward voltage is not rated for sustained conduction. Always verify polarity alignment before integrating the SMDJ85AH into a design.
Does the SMDJ85AH meet automotive qualification standards?
Yes, the SMDJ85AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its DO-214AB package, moisture sensitivity level 1 rating, and +175 °C maximum junction temperature further support deployment in automotive under-hood and body-control modules. These qualifications are documented in Taiwan Semiconductor's official SMDJ10AH–SMDJ100AH datasheet revision B2104.
What is the thermal resistance of the SMDJ85AH, and how does it affect layout design?
The SMDJ85AH has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values indicate that effective copper pour area and thermal vias beneath the cathode pad are essential to sustain repetitive surge duty cycles. Layouts must avoid narrow traces or isolation around the SMDJ85AH pads to prevent localized overheating, especially in high-temperature environments like engine compartments.
Can the SMDJ85AH replace the older SMDJ85A without design changes?
Yes, the SMDJ85AH is a direct replacement for SMDJ85A with identical electrical specifications, DO-214AB package dimensions, and pinout. The "H" suffix denotes enhanced reliability and AEC-Q101 qualification, while retaining full compatibility with existing footprints and assembly processes. No PCB modifications or firmware updates are needed when upgrading from SMDJ85A to SMDJ85AH in production designs.
SMDJ85AH 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 21.9A
- 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)
SMDJ85AH FAQ
1.How can I place an order for SMDJ85AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ85AH 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 SMDJ85AH reliable?
The price and inventory of SMDJ85AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ85AH is usually 5 days.
3.What payment methods are accepted for SMDJ85AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ85AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ85AH?
SMDJ85AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ85AH 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 SMDJ85AH?
For technical support, including SMDJ85AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ85AH requirements.
6.How does Aetrix verify that SMDJ85AH is sourced from the original manufacturer or authorized distributors?
All SMDJ85AH 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 SMDJ85AH meets industry standards.
7.What is the process for return or replacement of SMDJ85AH?
All SMDJ85AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ85AH, 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 SMDJ85AH part is unused and in its original packaging.
Return procedure for SMDJ85AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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