My Inquiry
My Account
Diodes Incorporated P4SMAJ8.5ADF-13
- Part No.:
- P4SMAJ8.5ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ8.5ADF-13.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:8,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMAJ8.5ADF-13 from Diodes Incorporated is a 400W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection on DC power rails and signal lines. It features a reverse standoff voltage of 8.5V, clamping voltage of 14.4V at 27.7A peak pulse current, and IEC 61000-4-2 ESD rating of ±30kV (air/contact), commonly deployed in industrial power supply input stages.
For engineers reviewing the P4SMAJ8.5ADF-13 datasheet, P4SMAJ8.5ADF-13 pinout, P4SMAJ8.5ADF-13 application, or P4SMAJ8.5ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under 10/1000µs transients, thermal resistance (RθJA = 88°C/W on 0.4"×0.5" PCB), and D-FLAT package compatibility with high-density layouts.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode during transient events, diverting surge current away from sensitive downstream circuitry while maintaining low clamping voltage. Its glass-passivated die construction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The device is optimized for fast response to sub-microsecond transients (e.g., ESD, lightning-induced surges) with typical junction-to-terminal thermal resistance of 39°C/W and maximum operating temperature of +150°C, enabling use in thermally constrained environments such as enclosed industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (per 10×1000µs waveform; defines maximum transient energy absorption) |
| Clamping Voltage | 14.4V @ 27.7A IPP (maximum voltage seen by protected circuit during worst-case surge) |
| Reverse Standoff Voltage | 8.5V (maximum continuous DC voltage before leakage exceeds 10µA) |
| Breakdown Voltage | 9.44–10.82V @ 1.0mA IT (guaranteed avalanche initiation range) |
| ESD Rating | ±30kV air/contact per IEC 61000-4-2 (meets Level 4 immunity requirements) |
| Thermal Resistance | 88°C/W junction-to-ambient (on 0.4"×0.5" FR-4 board; determines derating above +25°C) |
| Package | D-FLAT (2-pin, 2.25–2.95mm width; enables <1.1mm profile and high board density) |
Pinout & Package
The P4SMAJ8.5ADF-13 uses a 2-terminal D-FLAT surface-mount package with cathode band marking. Terminals are matte tin annealed over copper leadframe, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode Band) | Anode connection for unidirectional operation | Connected to protected line; conducts during positive transients relative to ground |
| 2 | Cathode connection | Typically tied to system ground or low-impedance return path to shunt surge current |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile D-FLAT packaging | Enables ≤1.1mm board height and saves >40% area vs. SMA packages in space-constrained designs |
| Glass-passivated die | Ensures stable VBR tolerance (±5%) and prevents parameter drift after 1000+ surge cycles |
| IEC 61000-4-2 ESD robustness | Withstands ±30kV contact discharge without degradation-eliminates need for external ESD filters |
| Halogen- and antimony-free "Green" construction | Meets RoHS 3 (2015/863/EU) with Br+Cl <1500ppm and Sb <1000ppm-supports eco-compliance programs |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Protecting 12V CAN bus transceivers and sensor inputs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L lines and chassis ground to clamp induced surges. Use Value: Clamps to 14.4V within nanoseconds, preventing damage to ISO 11898-compliant transceivers rated for 16V absolute max. | Use Scenario: Safeguarding microcontroller GPIOs and LIN bus interfaces from battery reverse polarity and alternator ripple. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5V/3.3V rail inputs to absorb 40A 8.3ms half-sine surges per ISO 7637-2. Use Value: Withstands 40A forward surge (IFSM) and maintains <10µA leakage at 8.5V-preserves low-power sleep modes. |
| Telecom Power Entry | Medical Diagnostic Equipment |
Use Scenario: Front-end protection for 48V PoE-powered Ethernet switches against lightning-induced surges on data lines. IC Role / Device Role / Timing Role: Bidirectional protection array built using two P4SMAJ8.5ADF-13 devices in series opposition. Use Value: Achieves symmetrical 14.4V clamping in both polarities with <0.5pF inter-electrode capacitance-minimizes signal distortion. | Use Scenario: Shielding analog front-end ADC inputs in portable ultrasound units from ESD events during probe handling. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector pins to prevent latch-up in precision op-amps. Use Value: Delivers ±30kV ESD immunity while adding only 0.35g mass and no thermal derating penalty at +40°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | Same 8.5V VRWM but SMB package (3.5mm × 4.5mm); RθJA = 65°C/W on larger pad | Higher thermal mass suits higher average surge duty cycles; less suitable for ultra-thin assemblies | Select when board space allows larger footprint and thermal management prioritizes steady-state dissipation over height |
| 1.5SMC8.5A | Same electrical specs but SMC package (7.1mm × 6.2mm); 1500W peak power rating | Designed for high-energy transients (e.g., AC mains surges); over-engineered for low-voltage DC rails | Choose only if legacy SMC footprint reuse is required and 1500W headroom justifies 3× board area penalty |
Compared with SMBJ8.5A and 1.5SMC8.5A, the P4SMAJ8.5ADF-13 delivers identical clamping performance in a 40% smaller footprint and 1.1mm profile-critical for modern compact power modules where vertical clearance and layout density constrain alternative choices.
Availability
P4SMAJ8.5ADF-13 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom power entry circuits, and medical diagnostic equipment requiring stable component supply across multi-year production cycles.
Supply support for P4SMAJ8.5ADF-13 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 centers across Asia and manufacturing in China, Taiwan, and the US.
The P4SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC rail protection in harsh electromagnetic environments-including factory automation, transportation, and infrastructure systems.
FAQ
What is the maximum allowable PCB temperature rise when operating P4SMAJ8.5ADF-13 at full 400W peak power?
At full 400W peak power, the device's thermal resistance (RθJA = 88°C/W on 0.4"×0.5" FR-4) implies a theoretical 3520°C rise-but this is non-sustainable. Per datasheet Figure 1, derating begins above +25°C ambient, and 400W is only valid for single, non-repetitive pulses. Continuous operation must stay within PM(AV) = 1.0W at TL = +75°C.
Can P4SMAJ8.5ADF-13 be used in bidirectional configurations?
No-it is a unidirectional TVS diode with cathode band marking. For bidirectional protection, two P4SMAJ8.5ADF-13 devices must be connected in series opposition (anode-to-anode), achieving symmetrical clamping at ±14.4V, as confirmed in Diodes' application note AN-8001 for telecom line protection.
Does the D-FLAT package support automated optical inspection (AOI) after reflow?
Yes-the D-FLAT's flat top surface, defined cathode band, and consistent 0.10–0.40mm terminal thickness enable reliable AOI detection. Diodes' package outline document (PN: D-FLAT) specifies coplanarity ≤0.15mm, meeting IPC-A-610 Class 3 requirements for automated visual verification.
How does the 10µA max reverse leakage at VRWM impact low-power sensor circuits?
At 8.5V VRWM, the 10µA max leakage adds negligible error-less than 0.05% offset in a 20kΩ pull-up network drawing 425nA. This ensures accuracy in battery-powered IoT sensors where standby current budgets are sub-µA, unlike older TVS parts with >100µA leakage.
P4SMAJ8.5ADF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 2-SMD, Flat Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D-Flat
P4SMAJ8.5ADF-13 FAQ
1.How can I place an order for P4SMAJ8.5ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ8.5ADF-13 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 P4SMAJ8.5ADF-13 reliable?
The price and inventory of P4SMAJ8.5ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ8.5ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ8.5ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ8.5ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ8.5ADF-13?
P4SMAJ8.5ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ8.5ADF-13 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 P4SMAJ8.5ADF-13?
For technical support, including P4SMAJ8.5ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ8.5ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ8.5ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ8.5ADF-13 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 P4SMAJ8.5ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ8.5ADF-13?
All P4SMAJ8.5ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ8.5ADF-13, 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 P4SMAJ8.5ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ8.5ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ8.5ADF-13 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…
