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NXP Semiconductors SA5212AD,602
- Part No.:
- SA5212AD,602
- Manufacturer:
- NXP Semiconductors
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA5212AD,602.pdf
- Description:
- IC TRANSIMPEDANCE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,871
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Product details
Overview
SA5212AD,602 from NXP Semiconductors (formerly Philips) is a 14 kΩ differential transimpedance amplifier optimized for fiber-optic receiver front-ends, delivering 140 MHz bandwidth, 2.5 pA/√Hz input-referred noise, and single 5 V supply operation. It converts low-level photodiode current into differential voltage with low input impedance (110 Ω) and supports analog/digital optical links up to 220 Mbaud.
For engineers reviewing the SA5212AD,602 datasheet, SA5212AD,602 pinout, SA5212AD,602 application in fiber-optic receivers or current-to-voltage conversion, or SA5212AD,602 equivalent for high-speed photodiode signal recovery, this page provides verified specifications, package mapping, real-world design context, and validated alternatives aligned with Philips' 1998 product specification.
Technical Context
The SA5212AD,602 employs a shunt-series feedback bipolar input stage with 7.2 kΩ internal feedback resistor, yielding a nominal 14 kΩ differential transresistance. Its architecture desensitizes frequency response to photodiode capacitance variations up to 1 pF, maintaining stable 140 MHz bandwidth without external compensation.
All active stages operate differentially-input current drives a single-ended node referenced to GND1, while outputs (OUT+ and OUT−) are emitter-follower buffered with ~17 Ω single-ended output resistance. Internal biasing uses dual reference voltages (VB1, VB2), and VCC2 pin isolates output collector nodes from the input stage to minimize feedback coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transresistance (diff) | 14 kΩ typical - defines gain from input current to differential output voltage; enables 1.4 V output for 100 µA input. |
| Bandwidth (−3 dB) | 140 MHz at TA = 25°C, VCC = 5 V - supports NRZ data rates up to 220 Mbaud in digital fiber receivers. |
| Input noise density | 2.5 pA/√Hz at f = 10 MHz - sets minimum detectable photocurrent; critical for low-power optical link sensitivity. |
| Supply voltage | 4.5–5.5 V - compatible with standard 5 V logic rails; PSRR of 33 dB ensures robustness against supply ripple. |
| Input resistance | 110 Ω typical - low impedance minimizes gain degradation from photodiode junction capacitance. |
| Differential output swing | 3.2 VPP max (RL = ∞) - sufficient headroom for ECL or AC-coupled LVDS interface without clipping. |
| Operating temperature | −40°C to +85°C - qualified for industrial and automotive ambient environments per ordering code SA5212AD. |
Pinout & Package
SA5212AD,602 is housed in an 8-pin plastic small outline (SO) package per SOT96-1, with 3.9 mm body width and gull-wing leads. Thermal resistance is 160°C/W (still air).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND1 (Pins 1, 5) | Input ground reference | Low-inductance return path for photodiode current; must be isolated from output return paths to prevent oscillation. |
| IIN (Pin 2) | Current input node | Single-ended, high-impedance-sensitive node; requires direct photodiode connection with minimal trace length. |
| VCC (Pin 3) | Primary power supply | Supplies input stage and first gain block; bypass with 0.1 µF ceramic capacitor placed adjacent to pin. |
| GND2 (Pins 4, 6) | Output ground reference | Return path for differential output currents; physically separated from GND1 to suppress ground bounce coupling. |
| OUT(−) (Pin 7) | Inverting differential output | Emitter-follower output with ~17 Ω source impedance; used with OUT(+) for balanced signaling or ECL interfacing. |
| OUT(+) (Pin 8) | Non-inverting differential output | Complementary to OUT(−); differential pair delivers 2× single-ended gain and improved PSRR over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Photodiode capacitance desensitization | Bandwidth remains stable across 0–1 pF photodiode capacitance due to Miller-effect dominance in input stage. |
| Dual ground separation | GND1 (input) and GND2 (output) pins enable PCB-level isolation, preventing feedback-induced peaking near 800 MHz. |
| ESD-hardened input | Withstands >2 kV HBM per JEDEC JS-001 - protects sensitive photodiode interface during handling and board assembly. |
| Internal level-shifting bias | VB1/VB2 references eliminate need for external bias networks; simplifies layout and improves thermal stability of quiescent points. |
| DC-coupled capability | Operates with no coupling capacitors; enables true DC-coupled optical monitoring and low-frequency signal recovery. |
Applications
| Fiber-Optic Digital Receiver | Analog Current-to-Voltage Conversion |
|---|---|
|
Use Scenario: 50–220 Mbaud NRZ optical link using PIN diode (e.g., BPF31) in telecom or industrial data links. IC Role / Device Role / Timing Role: Primary transimpedance preamplifier converting photodiode current to differential voltage for ECL line receiver (e.g., 10116) or SA5214 amplifier. Use Value: Enables BER <10⁻⁹ at 40 Mbaud over −40°C to +85°C with 120 µA overload tolerance and 64 dB electrical dynamic range. |
Use Scenario: Low-noise amplification of microamp-level sensor currents (e.g., radiation detectors, photoconductive cells). IC Role / Device Role / Timing Role: High-linearity current-input amplifier with 2% linearity up to ±40 µA and ±120 µA overload threshold. Use Value: Delivers 2.5 pA/√Hz noise floor and 140 MHz bandwidth-critical for wideband sensor signal integrity without external filtering. |
| Single-Ended to Differential Converter | Low-Noise RF Signal Processing |
|
Use Scenario: Converting single-ended current sources (e.g., RF mixer IF output) to balanced signals for ADC drivers or baluns. IC Role / Device Role / Timing Role: Active differential converter with matched gain paths and 0.05%/°C transresistance drift. Use Value: Provides 14 kΩ differential gain with 17 Ω output impedance-enables direct 50 Ω system interface without external termination. |
Use Scenario: Front-end amplification in RF test equipment or spectrum analyzers requiring flat 100–140 MHz response. IC Role / Device Role / Timing Role: Wideband gain block with 110 Ω input resistance and 10 pF input capacitance for minimal source loading. Use Value: Maintains ≤1 dB gain flatness from 10–120 MHz and exhibits <2 ns rise time-supports fast pulse and modulated RF signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA657IDBVR | 1.6 GHz GBW FET-input op amp; requires external feedback resistor; 4.8 nV/√Hz voltage noise (vs. 2.5 pA/√Hz current noise). | Higher bandwidth but higher input capacitance (1.1 pF); less tolerant of photodiode capacitance; needs careful layout for stability. | Preferred when >500 MHz bandwidth is required and photodiode capacitance is <0.5 pF; not drop-in-requires redesign of feedback network. |
| LMH6629MA/NOPB | 1.5 GHz GBW, ultra-low-noise (0.94 nV/√Hz) voltage-feedback op amp; also requires external transimpedance configuration. | Superior voltage noise but higher input bias current (2 µA vs. sub-µA); unsuitable for high-impedance photodiode sources without guard rings. | Best for low-capacitance, low-impedance current sources where voltage noise dominates; not recommended for standard fiber-optic PIN diodes. |
Compared with OPA657IDBVR and LMH6629MA/NOPB, the SA5212AD,602 offers integrated, factory-trimmed 14 kΩ transresistance, lower input-referred current noise, and inherent photodiode capacitance desensitization-making it uniquely suited for production fiber-optic receivers without custom compensation.
Availability
SA5212AD,602 is available at Aetrix Electronics and suitable for fiber-optic communication systems, medical photodetector interfaces, and high-speed instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SA5212AD,602 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
NXP Semiconductors (originally Philips Semiconductors) is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and communication markets.
The SA5212AD,602 belongs to Philips' legacy high-speed analog amplifier family designed specifically for fiber-optic receiver front-ends, emphasizing low-noise current amplification, photodiode interface robustness, and industrial temperature reliability.
FAQ
What is the maximum input current before clipping occurs in the SA5212AD,602?
The SA5212AD,602 exhibits output stage clipping at approximately ±240 µA input current under typical conditions (VCC = 5 V, TA = 25°C). The device maintains 2% linearity up to ±40 µA and tolerates ±120 µA overload without permanent damage, as confirmed by Test Circuit 6, Procedure 2 and 4 in the Philips SA5212A datasheet.
Does the SA5212AD,602 require external biasing for photodiode operation?
No, the SA5212AD,602 does not require external biasing-the input stage is current-driven and internally biased. Philips explicitly recommends using a pull-up resistor to VCC for the PIN diode, but the SA5212AD,602 itself generates all necessary internal reference voltages (VB1, VB2) and operates with zero external bias components on the IIN pin.
Can the SA5212AD,602 be used with a 3.3 V supply?
No, the SA5212AD,602 is specified only for 4.5–5.5 V operation per its Recommended Operating Conditions table. Absolute Maximum Rating for VCC is 6 V, and performance parameters-including 140 MHz bandwidth and 2.5 pA/√Hz noise-are guaranteed only within the 5 V ±0.5 V range. Operation at 3.3 V is unsupported and will degrade transresistance, bandwidth, and output swing.
What is the purpose of the separate GND1 and GND2 pins on the SA5212AD,602?
GND1 serves as the dedicated low-inductance return for photodiode current and input-stage biasing, while GND2 carries output-stage return currents. This physical separation prevents output-stage switching noise from coupling back into the sensitive input node-a key requirement to avoid oscillation near 800 MHz, as documented in the Application Information section of the SA5212A datasheet.
Is the SA5212AD,602 pin-compatible with the NE5212A or SE5212A?
Yes, the SA5212AD,602 is a direct functional and pin-compatible replacement for the NE5212A and SE5212A, as stated in the Philips document title: "Replaces datasheet NE/SA/SE5212A of 1995 Apr 26." Pin configuration, electrical specifications, and package outline (SOT96-1) are identical across all three part numbers.
SA5212AD,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Transimpedance
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 140 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 26mA
- Current - Output / Channel:
- 4 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SA5212AD,602 FAQ
1.How can I place an order for SA5212AD,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5212AD,602 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 SA5212AD,602 reliable?
The price and inventory of SA5212AD,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA5212AD,602 is usually 5 days.
3.What payment methods are accepted for SA5212AD,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5212AD,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA5212AD,602?
SA5212AD,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5212AD,602 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 SA5212AD,602?
For technical support, including SA5212AD,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5212AD,602 requirements.
6.How does Aetrix verify that SA5212AD,602 is sourced from the original manufacturer or authorized distributors?
All SA5212AD,602 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 SA5212AD,602 meets industry standards.
7.What is the process for return or replacement of SA5212AD,602?
All SA5212AD,602 units undergo pre-shipment inspection (PSI). If there is an issue with SA5212AD,602, 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 SA5212AD,602 part is unused and in its original packaging.
Return procedure for SA5212AD,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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