My Inquiry
My Account
Diodes Incorporated SMF4L36A-7
- Part No.:
- SMF4L36A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L36A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,525
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF4L36A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in DC power rails and signal lines. It features a 36V working peak reverse voltage (VRWM), 40–44.2V breakdown voltage (VBR), 58.1A maximum peak pulse current (IRSM), and clamps to ≤58.1V at rated surge, making it suitable for protecting automotive battery interfaces and industrial I/O ports against ESD and lightning-induced transients.
For engineers reviewing the SMF4L36A-7 datasheet, SMF4L36A-7 pinout, SMF4L36A-7 application, or SMF4L36A-7 equivalent, this device is selected for high-reliability transient suppression where low clamping voltage, sub-1ns response time, AEC-Q200 readiness, and DO-219AA space-constrained packaging are critical design requirements.
Technical Context
This TVS diode operates as a unidirectional clamp with cathode-band polarity marking, leveraging silicon avalanche breakdown to divert surge energy away from sensitive downstream circuitry. Its 10/1000µs waveform rating of 400W defines its transient handling capability under standardized surge conditions.
Thermal performance is characterized by 96°C/W junction-to-ambient resistance on standard FR-4 PCB layout, enabling stable operation up to +175°C junction temperature. The device meets IEC 61000-4-2 Level 4 ESD immunity (±30kV air/±30kV contact) without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform): sustains single high-energy surges common in automotive load-dump and industrial switching events |
| Working Peak Reverse Voltage | 36V: maximum continuous DC voltage applied without leakage exceeding 0.5µA - sets operating rail compatibility |
| Breakdown Voltage | 40–44.2V @ 1mA: onset voltage range where avalanche conduction begins - ensures reliable triggering before system damage |
| Clamping Voltage | ≤58.1V @ 6.9A: maximum voltage seen by protected circuit during rated surge - directly limits stress on downstream ICs |
| ESD Rating | ±30kV air / ±30kV contact per IEC 61000-4-2: qualifies for direct interface protection in handheld and automotive modules |
| Response Time | <1.0ns (unidirectional): enables suppression before transient edge propagates into logic or analog circuitry |
| Junction Temperature Range | −55°C to +175°C: supports under-hood automotive and industrial environments without derating |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount molded plastic case (1.90 × 2.80 × 3.80 mm), halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse-biased surge event |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery+, CAN_H); marked by visible cathode band on package top view |
Key Features
| Feature | Design Value |
|---|---|
| Space-efficient footprint | DO-219AA package occupies <1.9 mm² PCB area - ideal for dense automotive ECUs and portable power modules |
| Low clamping ratio | VC/VBR ≈ 1.35 - minimizes overvoltage overshoot relative to breakdown threshold, enhancing system margin |
| Automotive-ready qualification | Manufactured in IATF 16949-certified facilities; supports PPAP and change control for AEC-Q200-compliant designs |
| Green material compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); UL 94V-0 flammability rating ensures safety in enclosed assemblies |
Applications
| Automotive Battery Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting 12V/24V battery feed lines in engine control units and body electronics against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and primary regulator input to clamp surges before LDO or DC-DC stage. Use Value: Limits voltage to ≤58.1V during 400W transients, preventing regulator latch-up and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in PLC I/O modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting fast transients before signal conditioning amplifiers and ADC front-ends. Use Value: Sub-1ns response and ±30kV ESD rating prevent data corruption and sensor offset drift during field maintenance or installation. |
| USB-C Power Delivery Port | Smart Meter Communication Interface |
|
Use Scenario: Safeguarding VBUS and CC lines in USB-C PD adapters and host devices against hot-plug surges and miswiring events. IC Role / Device Role / Timing Role: Dual placement - SMF4L36A-7 on VBUS (36V-rated), SMF4L5.0CA on CC line - provides coordinated rail-level and data-line protection. Use Value: Clamping at 58.1V prevents damage to PD controller ICs while maintaining USB-IF electrical compliance under repeated surge stress. |
Use Scenario: Protecting RS-485/PLC communication ports in smart electricity meters exposed to induced surges on long outdoor wiring runs. IC Role / Device Role / Timing Role: TVS installed across differential pair (A/B) and shield, referenced to local ground plane to absorb common-mode transients. Use Value: 400W rating handles 10/1000µs surges per IEC 61000-4-5 Level 3, ensuring meter uptime and data integrity in utility grid deployments. |
Availability
SMF4L36A-7 is available at Aetrix Electronics and suitable for automotive battery management, industrial sensor interface, USB-C power delivery, and smart meter communication applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF4L36A-7 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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and consumer markets.
The SMF4L series belongs to Diodes' high-power TVS portfolio, engineered specifically for space-constrained, high-surge environments where rapid clamping, low leakage, and AEC-Q200 alignment are mandatory.
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Same 36V VRWM, but SMA package (larger DO-214AC); 400W rating, 64.5V clamping at 6.2A | Less compact; requires ~3× more PCB area; higher thermal resistance (110°C/W) | Select when legacy board layout prohibits DO-219AA rework or when higher solder joint robustness is prioritized over size |
| SMF4L36CA | Bidirectional variant; identical VRWM, VBR, and clamping specs; no cathode band marking | Supports AC-coupled or bidirectional signal lines (e.g., CAN, RS-485); not suitable for DC rail protection | Choose only for symmetrical transient threats where polarity reversal must be tolerated - not a drop-in replacement for unidirectional use |
Compared with SMAJ36A, SMF4L36A-7 saves >60% board space and improves thermal coupling; versus SMF4L36CA, it offers superior DC rail protection fidelity but lacks bidirectional surge handling - selection depends strictly on signal polarity architecture and layout constraints.
FAQ
What is the maximum clamping voltage of SMF4L36A-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 58.1V at 6.9A peak pulse current (IRSM), measured under the standardized 10/1000µs double-exponential waveform. This value represents the highest voltage imposed on the protected circuit during worst-case surge conditions and is guaranteed across the full operating temperature range (−55°C to +175°C).
Is SMF4L36A-7 qualified for automotive applications per AEC-Q200?
SMF4L36A-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, but it is not itself AEC-Q200-qualified. For automotive-grade compliance, Diodes recommends the Q-suffix variant SMF4L36AQ-7, which undergoes extended reliability testing including temperature cycling, humidity bias, and surge endurance per AEC-Q200 Rev H.
How does the DO-219AA package affect thermal performance compared to SMA (DO-214AC)?
DO-219AA delivers lower junction-to-ambient thermal resistance (96°C/W vs. ~110°C/W for SMA) due to optimized copper lead frame geometry and shorter thermal path to PCB. On a 1"×1" FR-4 board with 2 oz. copper, this enables ~12% higher sustained power dissipation before reaching 175°C junction limit - critical for high-temperature under-hood placements.
Can SMF4L36A-7 be used in bidirectional signal protection such as RS-485 or CAN bus?
No - SMF4L36A-7 is unidirectional and features a cathode band marking; applying reverse polarity beyond VRWM will cause forward conduction and potential failure. For bidirectional lines, the SMF4L36CA variant must be used, as it is symmetrically rated for ±36V standoff and clamps equally in both directions.
SMF4L36A-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-219AA
- Series:
- SMF4L
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L36A-7 FAQ
1.How can I place an order for SMF4L36A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L36A-7 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 SMF4L36A-7 reliable?
The price and inventory of SMF4L36A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L36A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L36A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L36A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L36A-7?
SMF4L36A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L36A-7 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 SMF4L36A-7?
For technical support, including SMF4L36A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L36A-7 requirements.
6.How does Aetrix verify that SMF4L36A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L36A-7 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 SMF4L36A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L36A-7?
All SMF4L36A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L36A-7, 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 SMF4L36A-7 part is unused and in its original packaging.
Return procedure for SMF4L36A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L36A-7 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
