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Diodes Incorporated SMAJ85CA-13-F
- Part No.:
- SMAJ85CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CA-13-F.pdf
- Description:
- TVS DIODE 85VWM 137VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,620
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Product details
Overview
SMAJ85CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for clamping ESD and surge transients in DC power lines and signal interfaces. It features a 85V reverse standoff voltage (VRWM), 94.4–104V breakdown range (VBR), 137V max clamping voltage (VC) at 2.9A peak pulse current (IPP), and SMA package with cathode band omitted per bidirectional construction. Used in automotive infotainment power rails to protect USB-C port ESD immunity.
For engineers reviewing the SMAJ85CA-13-F datasheet, SMAJ85CA-13-F pinout, SMAJ85CA-13-F application, or SMAJ85CA-13-F equivalent, key selection criteria include clamping ratio (VC/VRWM = 1.61), low leakage (<5 µA @ 85V), unidirectional vs. bidirectional polarity configuration, and IATF 16949-manufactured AEC-Q200-compliant variants (SMAJ85CAQ-13-F).
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias it presents <5 µA leakage at VRWM = 85V; during transient events exceeding VBR (94.4–104V), it avalanches to clamp voltage at ≤137V within <1 ns response time. Its glass-passivated junction ensures stable breakdown and low capacitance (≈15 pF @ 1 MHz, 0 V bias).
The device handles non-repetitive 8.3 ms half-sine surges up to 2.9A (IPP), derating linearly above +25°C ambient - delivering 100% rated power at TL ≤ +75°C and maintaining operation across -55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms surge without failure; defines maximum transient energy absorption capability. |
| Reverse Standoff Voltage | 85 V - maximum continuous DC or RMS voltage before significant leakage; sets operating margin below clamping threshold. |
| Breakdown Voltage Range | 94.4–104 V - guaranteed avalanche initiation window at 1 mA test current; ensures predictable turn-on behavior. |
| Max Clamping Voltage | 137 V @ 2.9 A - upper limit of suppressed voltage during full-rated surge; determines protected circuit's voltage stress ceiling. |
| Leakage Current | <5 µA @ 85 V - minimal standby power loss and signal integrity impact in always-on power rails. |
| Junction Temperature Range | -55°C to +150°C - supports under-hood automotive, industrial control, and outdoor telecom deployments. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, 0.064 g mass, and matte tin lead finish compliant with RoHS 3 and J-STD-020 Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common terminal for both polarity conduction paths; connects to system ground or low-impedance reference plane. |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode in bidirectional configuration; no polarity marking on device body. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12 V/24 V automotive power buses. |
| Glass-passivated die | Ensures stable VBR over lifetime and temperature, minimizing drift in critical clamping performance. |
| Bidirectional configuration | Protects AC-coupled or dual-polarity interfaces (e.g., RS-485, CAN FD bus lines) without polarity dependency. |
| Low clamping ratio (1.61) | Reduces voltage overshoot relative to VRWM, easing downstream IC voltage tolerance requirements. |
Applications
| Automotive Infotainment Power Rail | Industrial RS-485 Communication Line |
|---|---|
Use Scenario: 12 V supply line feeding head unit USB-C PD controller exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt clamping TVS placed between VBUS and chassis ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤137 V, preventing damage to USB-C controller ICs rated for 20 V absolute maximum. |
Use Scenario: Termination point of long-haul RS-485 bus in factory automation PLC cabinet subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair (A/B), symmetrically suppressing ±1 kV EFT bursts. Use Value: Maintains signal integrity by limiting common-mode excursion to <137 V while adding only ~15 pF capacitance at 1 MHz. |
| Telecom PoE+ Midspan Injector | Medical Patient Monitor ECG Input |
Use Scenario: 48 V DC output stage of IEEE 802.3at midspan injector where surges couple from Ethernet cable pairs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on PSE output, coordinated with upstream current-limiting FETs. Use Value: Absorbs 400 W surge energy without thermal runaway, preserving PoE+ compliance and Class 4 power delivery. |
Use Scenario: Front-end analog input protection for isolated ECG amplifier handling microvolt-level biopotential signals. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) bidirectional clamp across differential inputs referenced to patient-isolated ground. Use Value: Prevents electrode flashover during defibrillation recovery while introducing negligible offset error or noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-13-F | Unidirectional version; includes cathode band marking; identical VRWM, VBR, VC, and IPP ratings. | Requires explicit polarity alignment in DC-only circuits; unsuitable for AC or differential signaling. | Select when protecting single-polarity rails (e.g., 5 V MCU supply) where polarity is fixed and board space allows orientation control. |
| SMBJ85CA-13-F | Same electrical specs but SMB (DO-214AA) package; 1.5× larger footprint; higher thermal mass and 600 W peak power rating. | Better suited for high-energy surges or elevated ambient temperatures due to improved thermal dissipation. | Choose when PCB layout permits larger footprint and system-level testing requires >400 W surge margin (e.g., EV charging station interface). |
Compared with SMAJ85CA-13-F, the unidirectional SMAJ85A-13-F demands strict polarity routing but offers identical clamping performance, while SMBJ85CA-13-F trades compactness for higher surge capacity and thermal resilience - making each optimal for distinct mechanical and stress-profile constraints.
Availability
SMAJ85CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, telecom PoE+ injectors, and medical ECG front-ends requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for SMAJ85CA-13-F 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification per AEC-Q200 for automotive-grade reliability.
SMAJxx(C)A series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC power and data-line protection in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the difference between SMAJ85CA-13-F and SMAJ85A-13-F?
SMAJ85CA-13-F is bidirectional with no polarity marking, enabling use on AC or differential lines like RS-485; SMAJ85A-13-F is unidirectional and marked with a cathode band, requiring correct orientation on DC rails. Both share identical VRWM (85 V), VBR (94.4–104 V), VC (137 V), and IPP (2.9 A) specifications per DS19005 Rev. 19-2.
Does SMAJ85CA-13-F meet AEC-Q200 requirements?
No - SMAJ85CA-13-F is the standard industrial-grade variant. The automotive-qualified version is SMAJ85CAQ-13-F, which undergoes additional AEC-Q200 stress testing, PPAP documentation, and is manufactured in IATF 16949-certified facilities. Both share identical electrical parameters but differ in qualification scope and traceability.
What is the thermal resistance junction-to-lead (RθJL) for SMAJ85CA-13-F?
RθJL is not specified in DS19005 Rev. 19-2. However, steady-state power derating data shows PM(AV) = 1.0 W at TL = +75°C, implying RθJL ≈ 75°C/W based on TJ(max) = +150°C. For precise thermal modeling, Diodes recommends using the pulse derating curve (Fig. 1) and verifying with actual board layout and copper area.
Can SMAJ85CA-13-F be used in parallel for higher surge current handling?
Not recommended without external balancing - slight VBR mismatches between units cause current hogging, leading to premature failure of one device. For >2.9 A IPP, select a higher-rated part (e.g., SMBJ85CA-13-F) or implement active current-sharing circuitry; parallel TVS use is discouraged per Diodes' application guidance in AN-102.
SMAJ85CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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):
- 2.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ85CA-13-F FAQ
1.How can I place an order for SMAJ85CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CA-13-F 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 SMAJ85CA-13-F reliable?
The price and inventory of SMAJ85CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ85CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CA-13-F?
SMAJ85CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CA-13-F 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 SMAJ85CA-13-F?
For technical support, including SMAJ85CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CA-13-F requirements.
6.How does Aetrix verify that SMAJ85CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ85CA-13-F 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 SMAJ85CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ85CA-13-F?
All SMAJ85CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CA-13-F, 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 SMAJ85CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ85CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85CA-13-F Tags
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