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Diodes Incorporated SMAJ85A-13-F
- Part No.:
- SMAJ85A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85A-13-F.pdf
- Description:
- TVS DIODE 85VWM 137VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:13,048
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Product details
Overview
SMAJ85A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 85V reverse standoff voltage, 94.4–104V breakdown range at 1mA, 137V max clamping voltage at 2.9A peak pulse current, and SMA package for board-level ESD/surge protection in DC power rails and signal lines.
For engineers reviewing the SMAJ85A-13-F datasheet, SMAJ85A-13-F pinout, SMAJ85A-13-F application, or SMAJ85A-13-F equivalent, key selection criteria include clamping voltage margin vs. protected IC VMAX, unidirectional polarity alignment with DC bias, 400W peak pulse rating for IEC 61000-4-5 Level 3/4 compliance, and SMA thermal derating above +25°C ambient.
Technical Context
This TVS operates as a clamping device-triggering avalanche conduction when transient voltage exceeds its breakdown threshold (VBR = 94.4–104V), limiting downstream voltage to ≤137V at 2.9A. It exhibits fast response (<1 ns) and low leakage (<5 µA @ 85V), enabling robust protection of sensitive 85V-rated interfaces without loading steady-state circuits.
Designed for single-pulse surge suppression per IEC 61000-4-5 (10/1000 µs waveform), it delivers 400W peak power dissipation with thermal derating above +25°C ambient and supports continuous operation up to +150°C junction temperature, making it suitable for automotive and industrial environments where transient energy and ambient temperature co-vary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains one-time 10/1000 µs surges up to this energy level without failure |
| Reverse Standoff Voltage | 85V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 94.4–104V @ 1mA - precise avalanche onset range ensures reliable triggering above system operating voltage |
| Max Clamping Voltage | 137V @ 2.9A - limits transient voltage seen by protected circuitry during worst-case surge |
| Leakage Current | <5 µA @ 85V - negligible standby power loss and no measurable impact on high-impedance nodes |
| Package | SMA - standardized surface-mount outline (4.0–4.6 mm length, 2.29–2.92 mm width) compatible with automated assembly |
| Junction Temp Range | −55°C to +150°C - validated operation across extended automotive and industrial temperature profiles |
Pinout & Package
Two-terminal SMA package: anode and cathode terminals aligned along the long axis; cathode identified by a band on the body end. The SMA outline measures 4.00–4.60 mm × 2.29–2.92 mm × 1.27–1.63 mm (L×W×H), with gull-wing leads for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point under forward bias | Connected to ground or lower-potential rail in unidirectional configuration; enables clamping to GND during positive transients |
| Cathode | Current exit point under forward bias; marked with band | Connected to protected line; avalanche conduction occurs from cathode to anode when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Rating | Enables compliance with IEC 61000-4-5 Level 3 (1kV/2Ω) and Level 4 (2kV/2Ω) surge testing on 24–48V systems |
| Glass Passivated Die | Improves reliability and moisture resistance over epoxy-passivated alternatives, supporting AEC-Q200 stress testing |
| Lead-Free & Halogen-Free | Meets RoHS 3 (2015/863/EU) and JEDEC J-STD-020 Level 1 moisture sensitivity requirements |
| Fast Response Time | <1 ns turn-on ensures clamping initiates before most IC damage thresholds are exceeded |
| Low Capacitance | ~25 pF typical (measured at 1 MHz, 0 V bias) - minimal signal integrity impact on data lines up to ~100 Mbps |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V DC input channels on programmable logic controller backplanes exposed to inductive switching transients and field wiring faults. IC Role / Device Role: Unidirectional TVS placed between channel and ground to clamp positive surges while blocking reverse leakage. Use Value: Limits transient voltage to ≤137V, protecting 30V-rated interface ICs and maintaining >100 kΩ input impedance during normal operation. | Use Scenario: LIN bus or 12V sensor supply lines in body control modules subject to load dump and jump-start events. IC Role / Device Role: Primary clamping device on low-voltage power rails upstream of LDOs and microcontrollers. Use Value: Absorbs 400W pulses without degradation, ensuring system reset immunity and meeting ISO 7637-2 Pulse 5a requirements. |
| Telecom Power Feeds | Renewable Energy Monitoring |
Use Scenario: 48V PoE-powered equipment front-end where Ethernet cables introduce lightning-induced surges. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), providing fast, low-clamp backup clamping. Use Value: Clamps residual transients to <137V within nanoseconds, preventing latch-up in PMICs and PHY transceivers. | Use Scenario: DC string monitoring circuits in solar inverters exposed to grid-switching transients and nearby lightning. IC Role / Device Role: Overvoltage protector on analog sensor inputs measuring panel voltage (up to 1000V) via resistive dividers. Use Value: Maintains <5 µA leakage at 85V, avoiding measurement drift while surviving repeated 2.9A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85AHE3_A/H | Same electrical specs; differing tape-and-reel packaging (3000 pcs/reel vs. 5000) and date-code marking format | No functional difference; identical thermal and surge performance | Select based on distributor inventory and production line reel compatibility |
| P6SMB85A | Same VRWM (85V) but higher PPK (600W); larger SMB package (4.58 × 3.94 mm) | Higher surge margin but requires more PCB area; not drop-in due to footprint mismatch | Choose only if 600W rating is required and PCB layout allows SMB placement |
Compared with SMAJ85A-13-F, SMAJ85AHE3_A/H offers identical protection performance with alternate packaging logistics, while P6SMB85A trades compactness for higher surge capacity-making the former ideal for space-constrained 24–48V industrial designs and the latter better suited for high-energy telecom or utility metering applications.
Availability
SMAJ85A-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power feeds requiring stable component supply, consistent RoHS-compliant sourcing, and full traceability from wafer to shipment.
Supply support for SMAJ85A-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for board-level surge and ESD protection in automotive, industrial, and communications systems where reliability under harsh electrical stress is critical.
FAQ
What is the maximum clamping voltage for SMAJ85A-13-F at its rated peak pulse current?
The maximum clamping voltage is 137V at 2.9A peak pulse current (IPP), measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMAJ85A-13-F suitable for bidirectional signal line protection?
No-SMAJ85A-13-F is unidirectional and must be used with correct polarity: cathode to the protected line, anode to ground. For bidirectional protection (e.g., AC lines or differential buses), the bidirectional variant SMAJ85CA-13-F is required, which lacks a polarity indicator and clamps symmetrically around 0V.
How does the SMA package affect thermal performance in continuous operation?
The SMA package has a thermal resistance of approximately 100°C/W (junction-to-ambient, free-air), limiting steady-state power dissipation to 1.0W at TL = +75°C. Derating is required above +25°C ambient, and PCB copper area significantly improves heat spreading-designers should follow Diodes' recommended pad layout for optimal thermal performance.
Does SMAJ85A-13-F meet automotive qualification standards?
The standard SMAJ85A-13-F is not AEC-Q200 qualified. Diodes offers the automotive-grade variant SMAJ85AQ-13-F, manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 Rev D, with extended temperature screening and PPAP documentation support for automotive applications.
SMAJ85A-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:
- 1
- Bidirectional Channels:
- -
- 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
SMAJ85A-13-F FAQ
1.How can I place an order for SMAJ85A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85A-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 SMAJ85A-13-F reliable?
The price and inventory of SMAJ85A-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 SMAJ85A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ85A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85A-13-F?
SMAJ85A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85A-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 SMAJ85A-13-F?
For technical support, including SMAJ85A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85A-13-F requirements.
6.How does Aetrix verify that SMAJ85A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ85A-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 SMAJ85A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ85A-13-F?
All SMAJ85A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85A-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 SMAJ85A-13-F part is unused and in its original packaging.
Return procedure for SMAJ85A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85A-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Diodes Incorporated
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